Neuronal Stimulation Triggers Neuronal Glycolysis and Not Lactate Uptake
Open accessAbstract
SUMMARY Proper brain function requires a substantial energy supply, up to 20% of whole body energy in humans, and brain activation produces large dynamic variations in energy demand. While local increases in cerebral blood flow are well known, the cellular responses to energy demand are controversial. During brain excitation, glycolysis of glucose to lactate temporarily exceeds the rate of mitochondrial fuel oxidation; although the increased energy demand occurs mainly within neurons, some have suggested this glycolysis occurs mainly in astrocytes, which then shuttle lactate to neurons as their primary fuel. Using metabolic biosensors in acute hippocampal slices and brains of awake mice, we find that neuronal metabolic responses to stimulation do not depend on astrocytic stimulation by glutamate release, nor do they require neuronal uptake of lactate; instead they reflect increased direct glucose consumption by neurons. Neuronal glycolysis temporarily outstrips oxidative metabolism, and provides a rapid response to increased energy demand.
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Written from the paper’s full text.
TL;DR
Using genetically encoded metabolic biosensors in acute hippocampal slices and awake mouse cortex, this paper finds that neuronal stimulation raises cytosolic NADH:NAD+ via increased neuronal glycolysis, not via astrocyte-derived lactate uptake. The results contradict a stimulation-dependent astrocyte-neuron lactate shuttle and support direct neuronal glucose consumption as a rapid metabolic response.
Key findings
- Synaptic stimulation of dentate granule neurons produced a ~2-fold rise in cytosolic NADH:NAD+ (Peredox lifetime 1.73 ± 0.01 ns at baseline to 1.88 ± 0.01 ns stimulated; mean ± SEM, n=166 neurons), lasting about 3 minutes and correlating with Ca2+ responses.
- Blocking postsynaptic glutamate receptors abolished the neuronal NADH transient, and antidromic stimulation still produced similar transients, indicating glutamate stimulation of astrocytes is neither sufficient nor necessary.
- MCT inhibition with AR-C155858 reduced the neuronal response to exogenous lactate to 27% ± 2% of control (n=36 neurons) but did not abolish—and actually increased—the stimulation-induced NADH transient (95% CI 1.23- to 1.34-fold larger). LDH inhibition reduced exogenous lactate responses by 78% ± 3% but increased stimulation-induced NADH transients by 37% ± 5% (n=54 neurons).
- In awake mice, whisker stimulation produced ~4–5 minute NADH transients in responsive S1-BF neurons, with a smaller typical increase (~33% over resting); MCT inhibition reduced exogenous lactate responses by 85.3% ± 6.3% (n=59 neurons in 6 animals) but did not diminish whisker-stimulation NADH transients.
- Neuronal intracellular glucose showed stimulation-induced dips that became larger with partial glucose transport inhibition and were reduced by MCT inhibition; glycolysis inhibition with iodoacetic acid greatly reduced NADH transients.
Methods
- Acute mouse hippocampal slices and awake, unanesthetized mice with cranial windows; C57BL/6NCrl mice, including postnatal day 1 viral injections for hippocampal sensors and adult mice for cortical imaging.
- Two-photon fluorescence lifetime imaging of genetically encoded biosensors: Peredox for cytosolic NADH:NAD+, RCaMP1h for Ca2+, SweetieTS for glucose, Laconic for lactate, and pHRed for pH.
- Stimulation via electrical synaptic or antidromic stimulation in slices and 10-second 5 Hz whisker stimulation in vivo; pharmacology included NBQX/D-AP5, AR-C155858, GSK-2837808A, iodoacetic acid, cytochalasin B, and aminooxyacetate.
Limitations
- The paper states that because experiments used optical signals from neuronal cell bodies, it cannot exclude ANLS activity at synaptic terminals; it also cannot exclude some contribution of mitochondrial NADH shuttles to the NADH transients.
- The paper states that the relative contributions of glycolysis and oxidative phosphorylation to immediate neuronal energy demands remain unknown.
- The text notes technical caveats: Laconic has shallow lactate dependence and pH sensitivity, producing uncertainty in absolute lactate concentrations; AOA’s small effect could partly reflect alanine transaminase inhibition; and in vivo drug delivery through the permeable window required higher concentrations and longer times than in slices.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
0 of 35 cited sources checked · 0 supported · 0 flagged
- Findingown data
Stimulation-induced NADHCYT transients occur in vivo in awake mice with whisker stimulation.
“Stimulation-induced transients in NADHCYT were not unique to the in vitro hippocampal slice preparation, but were also observed in a more natural in vivo situation, in the brains of awake, unanesthetized mice.”
Quote in the paperSubstantial claim - Findingown data
In vivo NADHCYT transients are well-correlated with Ca2+ response even for small responses.
“As for the in vitro case, the size of the NADHCYT transients was well-correlated with the Ca2+ response even for small responses (Figure 7C).”
Quote in the paperNot a substantial claim - Findingown data
MCT inhibitor inhibits stimulation-induced glucose dips.
“Indeed, we found that application of MCT inhibitor to the slice did inhibit the stimulation-induced dips reported by the glucose sensor (Fig 5C, D).”
Quote in the paperSubstantial claim - Findingown data
Ca2+ and NADHCYT responses are well-correlated even for the smallest responses.
“Recording from many neurons, we observed a wide range of both Ca2+ and NADHCYT responses, but the two were well-correlated even for the smallest responses (Fig. 1D)”
Quote in the paperNot a substantial claim - Findingown data
AOA causes only a small reduction (~10%) in stimulation-induced NADHCYT transients.
“There was only a small reduction (~10%) in the transients in the presence of AOA, relative to the slight increase in parallel controls with pyruvate (Fig. 6C, Suppl. Fig. S6).”
Quote in the paperSubstantial claim
- Findingown data
The increase in NADHCYT is about 2-fold, from ~1:1000 to ~1:500, with Peredox LT 1.73 ± 0.01 ns baseline to 1.88 ± 0.01 ns stimulated (n=166).
“The increase in cytosolic NADH:NAD+ ratio (hereafter referred to as NADHCYT) was quite substantial, with 60 stimuli typically producing a change from a baseline ratio of ~1:1000 up to a stimulated ratio of ~1:500, a ~2-fold change (corresponding to a Peredox LT of 1.73 ± 0.01 ns at baseline and 1.88 ± 0.01 ns when stimulated; mean ± SEM, n=166 neurons).”
Quote in the paperSubstantial claim - Findingown data
MCT inhibitor AR-C155858 blocks the rise in neuronal NADHCYT by direct application of exogenous lactate.
“In the presence of the MCT inhibitor, the NADHCYT response to direct application of exogenous lactate was much smaller (27% ± 2% of the original response, mean ± SEM, n=36 neurons), as expected if lactate uptake is mostly blocked.”
Quote in the paperSubstantial claim - Findingown data
Brief synaptic stimulation of DGNs produces a prominent and reliable elevation of cytosolic NADH:NAD+ ratio for about 3 minutes.
“Upon brief synaptic stimulation of the DGNs by electrical stimulation in the molecular layer of the dentate gyrus (60 brief pulses), there was a prominent and reliable elevation of the cytosolic NADH:NAD+ ratio for a period of about 3 minutes (Figure 1A–C).”
Quote in the paperSubstantial claim - Findingown data
MCT inhibitor causes a small decline in resting NADHCYT.
“Next we applied the MCT inhibitor AR-C155858 (2 μM), and observed a small decline in the resting NADHCYT”
Quote in the paperNot a substantial claim - Findingown data
MCT inhibitor does not significantly change neuronal intracellular [lactate] transients.
“With application of the MCT inhibitor, there was no significant change in these neuronal intracellular [lactate] transients (Fig. 3G)”
Quote in the paperSubstantial claim - Findingown data
AOA produces a large increase in baseline NADHCYT.
“Application of AOA (10 mM) to hippocampal slices produced a prompt, large increase in NADHCYT (Fig. 6A) as expected from inhibition of a major contributor to cytosolic NADH recycling.”
Quote in the paperSubstantial claim - Findingnone given
Maximal changes in NAD(P)H autofluorescence are typically much smaller (5-10%) than Peredox changes with comparable stimuli.
“The maximal changes in NAD(P)H autofluorescence are typically much smaller (5–10%) than the changes we observe here using Peredox, employing comparable stimuli.”
Quote in the paperSubstantial claim - Findingown data
Synaptic stimulation produces reproducible increases in neuronal intracellular [lactate] in DGNs.
“We saw reproducible increases in the Laconic signal of DGNs with synaptic stimulation, corresponding to an increase in neuronal intracellular [lactate] (Fig. 3G, left).”
Quote in the paperSubstantial claim - Findingown data
Antidromic stimulation produces NADHCYT transients in DGN cell bodies very similar to those produced by synaptic stimulation.
“Despite the relative absence of glutamate release, we observed that antidromic stimulation produced NADHCYT transients in the DGN cell bodies very similar to those produced by synaptic stimulation (Fig 2E, F)”
Quote in the paperSubstantial claim - Findingreasoning
Neurons are themselves a site of this increased glycolysis.
“Our results argue that neurons are themselves a site of this increased glycolysis”
Quote in the paperSubstantial claim - Premisecitation
Most experimental support for the ANLS comes from separate experiments on neurons and astrocytes in cell culture.
“Most of the experimental support for the ANLS has come from separate experiments on neurons and astrocytes, both conducted in cell culture conditions (Pellerin et al., 2007).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Pellerin et al., 2007 source
Not checked in the free run.
- Premisecitation
In vivo measurements of stimulated glucose analog uptake have given conflicting results.
“In vivo measurements to learn which cell type shows greater stimulated uptake of glucose analogs have given conflicting results (Chuquet et al., 2010; Lundgaard et al., 2015)”
Quote in the paperSubstantial claim0 of 2 sources checked - Premisecitation
Brain activation increases glucose consumption much more than oxygen consumption.
“However, with brain activation, glucose consumption increases much more than oxygen consumption (Fox and Raichle, 1986; Fox et al., 1988).”
Quote in the paperSubstantial claim0 of 2 sources checked - Interpretationown data
Glutamate stimulation of astrocytes is not required for neuronal NADHCYT transients.
“Despite the relative absence of glutamate release, we observed that antidromic stimulation produced NADHCYT transients in the DGN cell bodies very similar to those produced by synaptic stimulation (Fig 2E, F), showing that glutamate stimulation of astrocytes is not required for the transients.”
Quote in the paperSubstantial claim - Interpretationown data
Glutamate stimulation of astrocytes is not sufficient to produce neuronal NADHCYT transients.
“Under these conditions, glutamate is still released from the presynaptic terminals and will be transported into astrocytes, and signaling through metabotropic glutamate receptors (GPCRs) is still intact, but these effects were not sufficient to produce an NADHCYT transient in the neurons.”
Quote in the paperSubstantial claim - Interpretationown data
Contribution of MAS to NADHCYT transients is minor.
“In either case, the contribution of the MAS to the NADHCYT transients appears to be minor.”
Quote in the paperNot a substantial claim - Interpretationown data
Stimulation-induced NADHCYT transients depend on neuronal glycolysis.
“These results suggest that the neuronal NADHCYT transient may be produced by a transient increase in the rate of neuronal glycolysis.”
Quote in the paperSubstantial claim - Interpretationreasoning
NADHCYT signals are distinct from NAD(P)H autofluorescence.
“These NADHCYT signals are distinct from the autofluorescence signal referred to as NAD(P)H”
Quote in the paperSubstantial claim - Study design and conductcitation
Peredox fluorescence lifetime gives a direct report of cytosolic NADH:NAD+ ratio.
“The fluorescence lifetime (LT) of the sensor protein, measured in nanoseconds, gives a direct report of sensor occupancy and thus of the cytosolic NADH:NAD+ ratio (Mongeon et al., 2016).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Mongeon et al., 2016 source
Not checked in the free run.
- Rests on an assumption: The Peredox biosensor is expressed in the cytosol and not targeted to mitochondria.
- Interpretationreasoning
The glucose dips do not result from an activity-induced decrease in glucose transport.
“This argues that the two effects are mechanistically connected, and thus it argues against the idea that the glucose dips result from a reported activity-induced decrease in glucose transport (Porras et al., 2004).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Porras et al., 2004 source
Not checked in the free run.
- Premisecitation
Neuronal NADH:NAD+ ratio is controlled by glycolysis, lactate dehydrogenase activity, and mitochondrial NADH shuttles, mainly the malate-aspartate shuttle.
“Neuronal NADH:NAD+ ratio is controlled by three major processes (Fig. 1E): glycolysis, lactate dehydrogenase activity, and mitochondrial NADH shuttles (Salway, 2004; in neurons, mainly the malate-aspartate shuttle, McKenna et al., 2006)”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Salway, 2004
Not checked in the free run.
- cites McKenna et al., 2006 source
Not checked in the free run.
- Interpretationown data
NADHCYT transients are produced by a transient increase in glycolysis.
“The conclusion that the NADHCYT transients are produced by a transient increase in glycolysis is also supported by the substantial inhibition of the transients by IAA treatment, which inhibits glycolysis (Figure 4).”
Quote in the paperSubstantial claim - Interpretationown data
Experimental results are incompatible with lactate shuttling from astrocytes to neurons during stimulation.
“These experimental results are incompatible with the hypothesis of lactate shuttling from astrocytes to neurons during stimulation.”
Quote in the paperSubstantial claim - Premisecitation
Immediately after brain activation, oxygen consumption does not rise commensurate with the increases in blood flow and glucose consumption.
“Despite the fact that both glycolysis and oxidative metabolism are elevated after stimulation, there is ample evidence that immediately after brain activation, oxygen consumption does not rise commensurate with the increases in blood flow and glucose consumption.”
Quote in the paperSubstantial claim0 of 3 sources checked - Premisecitation
Oxygen consumption increases promptly in response to stimulation in brain slices.
“Measurements of oxygen levels in brain slices indicate that oxygen consumption does increase promptly in response to stimulation (Hall et al., 2012; Ivanov et al., 2014)”
Quote in the paperNot a substantial claim0 of 2 sources checked - Interpretationown data
Production of NADH from glycolysis exceeds the rate of NADH shuttling to mitochondria during stimulation.
“The large stimulation-induced increase in NADHCYT that we observe using the Peredox sensor indicates that the production of NADH from glycolysis exceeds the rate of NADH shuttling to mitochondria.”
Quote in the paperSubstantial claim- Rests on an assumption: The Peredox biosensor is expressed in the cytosol and not targeted to mitochondria.
- Rests on an assumption: NADH does not pass through mitochondrial membranes.
- Interpretationreasoning
The rise in NADH is accompanied by an increase in lactate/pyruvate ratio due to LDH recycling NAD+.
“Moreover, the rise in NADH is almost certainly accompanied by an increase in the lactate/pyruvate ratio, due to the rapid action of lactate dehydrogenase that serves to recycle NAD+ for use in further glycolysis.”
Quote in the paperSubstantial claim - Interpretationown data
The glucose dip is due to increased rate of neuronal glucose consumption exceeding any increase in glucose uptake.
“We attribute this dip to an increased rate of neuronal glucose consumption that exceeds any increase in glucose uptake.”
Quote in the paperSubstantial claim - Interpretationown data
Glycolysis plays a dominant role in producing NADHCYT transients.
“While we cannot exclude some contribution of the mitochondrial NADH shuttles to producing the NADHCYT transients, it appears that glycolysis plays a dominant role.”
Quote in the paperSubstantial claim - Interpretationown data
Neuronal NADHCYT transients are not produced by lactate import.
“The failure of the MCT inhibitor to abolish (or even diminish) the stimulated rise in neuronal NADHCYT, despite its ability to nearly abolish the direct response to exogenous lactate, demonstrates conclusively that the neuronal transients in NADHCYT are not produced by lactate import.”
Quote in the paperSubstantial claim - Premisecitation
NAD(P)H autofluorescence is almost certainly dominated by mitochondrial NADH.
“The NAD(P)H autofluorescence is almost certainly dominated by mitochondrial NADH (Brennan et al., 2006; Shuttleworth, 2010; Berndt et al., 2015).”
Quote in the paperSubstantial claim0 of 3 sources checked - Interpretationown data
Conversion of pyruvate to lactate and export of lactate are normally required to recycle NAD+ and permit continued high rate of glycolysis.
“This picture is bolstered by our observation that NADHCYT actually rises more when the movement of lactate across the plasma membrane (via MCTs) is blocked -- suggesting that conversion of pyruvate to lactate and export of lactate are normally required to recycle NAD+ and permit a continued high rate of glycolysis.”
Quote in the paperSubstantial claim - Interpretationown data
The glucose dips are not caused by a dip in extracellular glucose secondary to increased astrocyte glucose utilization.
“This result is opposite from what would be expected if the dips had been caused by a dip in the extracellular glucose concentration, secondary to increased astrocyte glucose utilization; in such a case, partial blockade of glucose transport should have diminished the size of the dips.”
Quote in the paperSubstantial claim - Interpretationown data
There is bidirectional coupling between glucose and NADHCYT.
“Thus there is bidirectional coupling between glucose and NADHCYT: the NADHCYT transients were diminished when glycolysis was inhibited, and glucose dips were diminished when NAD+ recycling was inhibited (by blocking lactate export).”
Quote in the paperSubstantial claim - Interpretationreasoning
There is at least some net aerobic glycolysis of glucose to lactate in neurons during stimulation.
“This likely rapid depletion of pyruvate suggests that there is at least some mismatch between the rate of pyruvate production by glycolysis and the rate of pyruvate oxidation by mitochondria - in other words, that there is at least some net “aerobic glycolysis” of glucose to lactate in the neurons.”
Quote in the paperSubstantial claim - Interpretationreasoning
Neurons turn to increased glucose metabolism for increased energy needs.
“Given that neuronal metabolic responses to stimulation do not rely on lactate import, it seems very likely that neurons turn instead to increased glucose metabolism for their increased energy needs.”
Quote in the paperSubstantial claim - Premisecitation
Anesthesia increases the apparent oxygen concentration of intact brain.
“as it has been previously demonstrated that anesthesia increases the apparent oxygen concentration of intact brain (Lyons et al., 2016).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Lyons et al., 2016 source
Not checked in the free run.
- Premisecitation
The mismatch between blood flow and oxygen consumption is the source of the BOLD signal that is commonly used to detect brain activation in functional imaging experiments.
“In fact, this mismatch between blood flow and oxygen consumption is the source of the BOLD signal that is commonly used to detect brain activation in functional imaging experiments (Kwong et al., 1992):”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Kwong et al., 1992 source
Not checked in the free run.
- Study design and conductcitation
Even with this correction, the effect of some green signal from RCaMP1h still appears to produce some shift of the baseline lifetime values for Peredox, compared to those seen in the absence of RCaMP1h.
“Even with this correction, the effect of some green signal from RCaMP1h still appears to produce some shift of the baseline lifetime values for Peredox, compared to those seen in the absence of RCaMP1h (Mongeon et al., 2016).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Mongeon et al., 2016 source
Not checked in the free run.
- Interpretationreasoning
Glycolysis - the net conversion of glucose to lactate - becomes a substantial component of the transient response to activation.
“and that instead glycolysis – the net conversion of glucose to lactate –becomes a substantial component of the transient response to activation.”
Quote in the paperSubstantial claim - Study design and conductown data
Expression of the Peredox sensor does not buffer increases in free [NADH]: the average change in sensor LT was uncorrelated with the level of sensor protein expression.
“Although in principle it is possible that expression of the Peredox sensor, an NADH binding protein, could buffer increases in free [NADH], we saw no evidence of this: the average change in sensor LT was uncorrelated with the level of sensor protein expression, judged from fluorescence intensity (Suppl. Fig. S2).”
Quote in the paperSubstantial claim - Premisecitation
Blood oxygenation level is somewhat paradoxically increased in activated regions, despite the increased metabolic demand.
“blood oxygenation level is somewhat paradoxically increased in activated regions, despite the increased metabolic demand.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Kwong et al., 1992 source
Not checked in the free run.
- Interpretationcitation
Increased glucose consumption is not accompanied by an equivalent increase in mitochondrial pyruvate oxidation.
“These observations support the idea that increased glucose consumption is not accompanied by an equivalent increase in mitochondrial pyruvate oxidation”
Quote in the paperSubstantial claim - Interpretationreasoning
During activation, neurons are likely to be exporters of glycolytic lactate rather than consumers of lactate from astrocytes.
“and that during activation they are likely to be exporters of glycolytic lactate rather than consumers of lactate from astrocytes.”
Quote in the paperSubstantial claim - Premisecitation
The MCT inhibitor AR-C155858 is highly specific to MCT1 and MCT2.
“The MCT inhibitor AR-C155858 was purchased from Tocris (Bristol, UK); it is highly specific to MCT1 and MCT2 (Ovens et al., 2010a)”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Ovens et al., 2010a
Not checked in the free run.
- May combine two claims. 18
- Classified as probably not a substantial claim. 15
May combine two claims.
Findingown dataBlockade of postsynaptic ionotropic glutamate receptors abolishes the NADHCYT transient while glutamate release and mGluR signaling remain intact.
“The opposite was seen: blockade of the postsynaptic response (as judged from the disappearance of the postsynaptic Ca2+ transient, and the disappearance of the EPSP from an extracellular electrode; Fig 2A, B and Suppl. Fig. S3) was accompanied by disappearance of the NADHCYT transient (Fig 2B, C).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn vivo, responsive neurons show ~4-5 min elevation in NADHCYT; non-responsive neurons show no significant change.
“Practically all of these responsive neurons exhibited an approximately 4–5 minute long elevation in NADHCYT (Figure 7A, B), while neighboring non-responsive neurons showed no significant change.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn vivo, MCT inhibitor reduces lactate-induced NADHCYT increase by 85.3% ± 6.3% but does not diminish whisker stimulation-induced NADHCYT transients.
“Application of the MCT inhibitor AR-C155858 (at 50 μM rather than the 2 μM used for slice) effectively reduced the size of the lactate-induced increase (by 85.3% ± 6.3%, mean ± SEM, n=59 neurons in 6 animals; Fig. 7D). Nevertheless, neuronal NADHCYT transients induced by whisker stimulation were not diminished by the MCT inhibitor (Fig. 7E, F).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataSynaptic stimulation produces small transient drops (dips) in neuronal intracellular [glucose] with similar time course to NADHCYT transients.
“We observed small transient drops (dips) in neuronal intracellular [glucose] upon synaptic stimulation that had a very similar time course to the NADHCYT transients (Fig. 5A).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataLDH inhibitor GSK-2837808A reduces NADHCYT response to exogenous lactate by 78% ± 3% but does not diminish stimulation-induced NADHCYT response; instead it increases it by 37% ± 5%.
“As expected, application of the LDH inhibitor reduced the NADHCYT response to direct application of exogenous lactate (by 78% ± 3% of the original response, mean ± SEM, n=54 neurons; Fig. 3E).”
- Also stated in: § Lactate import does not contribute to neuronal NADHCYT transients · plain
“Instead, the stimulation-induced NADHCYT responses were larger (by 37% ± 5%; n=54 neurons; Fig. 3F), as expected for production of NADH within the neuron when LDH-dependent recycling to NAD+ is inhibited.”
Quote in the paperSubstantial claim- Rests on an assumption: The LDH inhibitor GSK-2837808A specifically inhibits lactate dehydrogenase.
- Also stated in: § Lactate import does not contribute to neuronal NADHCYT transients · plain
May combine two claims.
Findingown dataPartial inhibition of glucose transport with cytochalasin B lowers baseline [glucose]i but increases the size of stimulation-induced glucose dips.
“When we deliberately reduced glucose transport rate chronically, by partial inhibition with cytochalasin B, the baseline [glucose]i was predictably lower, but the stimulation-induced dips in [glucose]i actually became larger (Fig 5A, B), consistent with our hypothesis.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn dentate granule neurons in hippocampal slice, typical increase in NADH:NAD+ ratio is ~2-fold; in barrel cortex in vivo, ~33% increase.
“In dentate granule neurons in a hippocampal slice, the typical increase in this ratio is substantial - approximately a 2-fold increase above the resting level. In neurons of barrel cortex observed in vivo, the typical increase is smaller (about a 33% increase over the resting level), but still substantial.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataIAA treatment diminishes baseline NADHCYT and greatly reduces stimulation-induced NADHCYT transient.
“IAA treatment diminished the baseline (consistent with a contribution of glycolysis to the resting NADHCYT level), and upon return to the experimental temperature, the stimulation-induced NADHCYT transient was much smaller, despite a slightly larger Ca2+ transient in response to stimulation.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
PremisecitationThe resting brain consumes glucose and metabolizes it nearly completely to CO2.
“It is generally agreed that the “resting” brain, under normal metabolic circumstances, consumes glucose and metabolizes it nearly completely to CO2 (Clarke and Sokoloff, 1994; Madsen et al., 1999).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Clarke and Sokoloff, 1994
Not checked in the free run.
- cites Madsen et al., 1999 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningWe cannot exclude ANLS activity at synaptic terminals.
“Because our experiments were all done with optical signals from the cell bodies of neurons, we cannot exclude the possibility of ANLS activity at synaptic terminals”
Quote in the paperNot a substantial claimMay combine two claims.
Interpretationown dataOur results support an ANLS that functions at rest but not during neuronal stimulation.
“Our results support the possibility of an ANLS that functions at rest but not during neuronal stimulation.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataIn vivo metabolic transients are endogenous to neurons and do not rely on lactate import from extracellular space or astrocytes.
“The failure of MCT inhibitor to abolish the stimulation-induced transients in vivo supports the conclusion that such metabolic transients are endogenous to the neurons and do not rely on lactate import from the extracellular space or from astrocytes.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationown dataThe physiological coordination of glycolysis and oxidative metabolism may be choreographed by calcium influx.
“The physiological coordination of both glycolysis and oxidative metabolism in response to neuronal activity may be choreographed by calcium influx, which, as shown in Figs. 1D and 7C, is tightly correlated to the cytosolic NADH transients.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
InterpretationreasoningNeurons normally export lactate when their metabolism is activated by stimulation.
“The fact that the transients are actually larger when the MCTs are inhibited may indicate that neurons normally export lactate when their metabolism is activated by stimulation, as discussed below.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim. May combine two claims.
PremisecitationNADHCYT can rise in response to increased glycolysis, increased conversion of lactate to pyruvate, or decreased activity of mitochondrial NADH shuttles.
“NADHCYT can rise in response to either increased glycolysis (which converts NAD+ to NADH at the GAPDH step), to increased conversion of lactate to pyruvate, or to decreased activity of mitochondrial NADH shuttles.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenMice were randomly allocated to experimental groups.
“Wild-type C57BL/6NCrl mice of both genders were bred in house and used in all acute brain slice and in vivo experiments, and mice were randomly allocated to experimental groups.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataRCaMP1h expression alone led to some signal in the green optical channel, probably due to an immature fluorophore, in direct experiments approximately 4.4% of the red fluorescence intensity, and having a lifetime of ~0.71 ns; these values were used to correct the baseline in dual expression experiments.
“Similarly, RCaMP1h expression alone led to some signal in the green optical channel, probably due to an immature fluorophore, in direct experiments approximately 4.4% of the red fluorescence intensity, and having a lifetime of ~0.71 ns; these values were used to correct the baseline in dual expression experiments.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductnone givenWhen imaging from the same cortical region on multiple days, previously imaged neurons were re-identified using the pattern of the surface vasculature as guidance, and then an adjacent volume was selected to ensure that all neurons in the sample were unique.
“When imaging from the same cortical region on multiple days, previously imaged neurons were re-identified using the pattern of the surface vasculature as guidance, and then an adjacent volume was selected to ensure that all neurons in the sample were unique.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing), S4 (based). May combine two claims.
InterpretationreasoningLike muscle, the brain has no doubt evolved to meet the large instant-to-instant changes in energy demands with a choreographed regulation of the core metabolic pathways, to ensure not only brain cell health but organismal survival.
“Like muscle, the brain has no doubt evolved to meet the large instant-to-instant changes in energy demands with a choreographed regulation of the core metabolic pathways, to ensure not only brain cell health but organismal survival.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationViral expression of Peredox and RCaMP1h permitted recording from different neurons in the same mice on different days.
“Viral expression of Peredox and RCaMP1h permitted recording from different neurons in the same mice on different days (Andermann et al., 2010; O’Connor et al., 2010).”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites Andermann et al., 2010
Not checked in the free run.
- cites O’Connor et al., 2010
Not checked in the free run.
May combine two claims.
PremisecitationPET studies show that blood flow and glucose consumption are dramatically increased by brain activation, but oxygen consumption barely increases.
“PET studies also show that blood flow and glucose consumption are dramatically increased by brain activation, but oxygen consumption barely increases (Fox and Raichle, 1986; Fox et al., 1988).”
Quote in the paperSubstantial claim0 of 2 sources checkedMay combine two claims.
InterpretationcitationMost likely the changes in free [NADH] are already buffered by high levels of cytosolic dehydrogenases that bind NADH, and the additional expression of sensor makes only a negligible change in the buffering capacity.
“Most likely the changes in free [NADH] are already buffered by high levels of cytosolic dehydrogenases that bind NADH (Zhang et al., 2002), and the additional expression of sensor makes only a negligible change in the buffering capacity.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Zhang et al., 2002
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningFor this reason, we mostly measured the net lifetime change for the transients, relative to baseline (ΔLT).
“For this reason, we mostly measured the net lifetime change for the transients, relative to baseline (ΔLT).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationIn the evolution of skeletal muscle, the muscle fibers with the most dynamic energy requirements -- the fast-twitch fibers -- tend to rely on glycolysis for prompt energy production.
“However, it is known that in the evolution of skeletal muscle, the muscle fibers with the most dynamic energy requirements -- the fast-twitch fibers -- tend to rely on glycolysis for prompt energy production (Crow and Kushmerick, 1982; Spriet, 1989).”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites Crow and Kushmerick, 1982
Not checked in the free run.
- cites Spriet, 1989
Not checked in the free run.
Classified as probably not a substantial claim.
PremisecitationThe commonly used MCT inhibitor α-cyano-4-hydroxycinnamate (4-CIN) blocks mitochondrial pyruvate uptake with higher affinity than it blocks MCTs.
“unlike the commonly used MCT inhibitor α-cyano-4-hydroxycinnamate (4-CIN), which blocks mitochondrial pyruvate uptake with higher affinity than it blocks MCTs (Halestrap and Denton, 1974).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Halestrap and Denton, 1974
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataBleedthrough of green Peredox fluorescence into the red RCaMP optical channel was corrected using the ratio of measured red to green fluorescence observed when only Peredox was expressed, approximately 6.0%.
“Bleedthrough of green Peredox fluorescence into the red RCaMP optical channel was corrected using the ratio of measured red to green fluorescence observed when only Peredox was expressed (Suppl. Fig. S2), approximately 6.0%.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationcitationThe ultimate fate of the exported lactate may be a combination of "catch-up" oxidation by many neighboring brain cells (and by the stimulated neurons themselves) as well as some net lactate excretion from the brain, particularly when activation is strong and synchronous, as in epilepsy.
“of “catch-up” oxidation by many neighboring brain cells (and by the stimulated neurons themselves) as well as some net lactate excretion from the brain (Dienel, 2012; Glenn et al., 2015), particularly when activation is strong and synchronous, as in epilepsy (Collins et al., 1970; During et al., 1994)”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Dienel, 2012 source
Not checked in the free run.
- cites Glenn et al., 2015
Not checked in the free run.
- cites Collins et al., 1970
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataGreen glucose sensor fluorescence produced a bleedthrough of ~5.9% to the red channel.
“Likewise, green glucose sensor fluorescence produced a bleedthrough of ~5.9% to the red channel.”
Quote in the paperNot a substantial claim
The paper relies on this without support.
The increased energy demand during brain excitation occurs mainly within neurons.
“although the increased energy demand occurs mainly within neurons, some have suggested this glycolysis occurs mainly in astrocytes”
The paper relies on this without support.
The Peredox biosensor is expressed in the cytosol and not targeted to mitochondria.
“The biosensor is expressed in cytosol and not targeted to mitochondria; it therefore reports cytosolic NADH: NAD+ ratio.”
The paper relies on this without support.
NADH does not pass through mitochondrial membranes.
“The NADHCYT transients reported by Peredox are in principle compartmentally separated from the changes in mitochondrial NADH, and NADH does not pass through the mitochondrial membranes.”
The paper relies on this without support.
The LDH inhibitor GSK-2837808A specifically inhibits lactate dehydrogenase.
“the neuronal NADHCYT transients were elevated rather than abolished upon inhibition of lactate dehydrogenase by the high-affinity inhibitor GSK-2837808A (2 μM; Fig. 3D, F).”
The paper relies on this without support.
Both glycolysis and oxidative metabolism are elevated after stimulation.
“Despite the fact that both glycolysis and oxidative metabolism are elevated after stimulation”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Previously published data strongly indicate that the increase in lactate and glutamate levels is the consequence of the surge in glycolysis and the ensuing increase of cytosolic NADH:NAD+ ratio taking place during neuronal activation.
“but previously published data strongly indicate that the increase in lactate and glutamate levels is the consequence of the surge in glycolysis and the ensuing increase of cytosolic NADH:NAD+ ratio taking place during neuronal activation (Díaz-García et al., 2017).”
From Perception is associated with the brain’s metabolic response to sensory stimulation (2022) · cites this paper as Díaz-García et al., 2017
The Results and Discussion (page numbers unavailable) link neuronal activation to increased glycolysis and a rise in cytosolic NADH:NAD+, and the Discussion suggests that activated neurons produce and export glycolytic lactate. The paper does not establish that increased glutamate levels are a consequence of glycolysis or the NADH:NAD+ rise; it discusses glutamate release as part of synaptic stimulation instead. (LLM, conf=0.87)
Experimental — accuracy not yet measuredAstrocyte-derived lactate is not required for the bioenergetic response to stimulation in neurons.
“This is consistent with a recent report that astrocyte-derived lactate is not required for the bioenergetic response to stimulation in neurons (Díaz-García et al., 2017).”
From ApoE4 Impairs Neuron-Astrocyte Coupling of Fatty Acid Metabolism (2021) · cites this paper as Díaz-García et al., 2017
Use of pure lactate as an alternative fuel, rather than a redox-balanced mixture of lactate and pyruvate, abnormally elevates the low cytosolic NADH redox ratio in neurons.
“However, the use of pure lactate as an alternative fuel, rather than a redox-balanced mixture of lactate and pyruvate, abnormally elevates the low cytosolic NADH redox ratio in neurons (seen in vitro by Hung et al. [2011] and Mongeon et al. [2016] as well as in vivo by Díaz-García et al. [2017]); this decreases the rate of neuronal glycolysis in a way that would not represent the normal effect in”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
Inhibition of MCT in vivo in cortical neurons of awake mice blocks the NADHCYT response to exogenous lactate but not to sensory stimulation.
“Inhibition of MCT in vivo in the cortical neurons of awake mice also blocks the NADHCYT response to exogenous lactate but not to sensory stimulation.”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
Blockade of MCT or LDH leads to enhancement of the NADHCYT transients.
“These blockers instead lead to enhancement of the NADHCYT transients, suggesting that neurons normally export lactate when stimulated.”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
With brief neuronal excitation in an acute hippocampal slice, NADHCYT rises rapidly and remains elevated for ∼2-3 min.
“With brief neuronal excitation in an acute hippocampal slice, NADHCYT rises rapidly and remains elevated for ∼2–3 min, reflecting a temporary imbalance favoring production of NADH over its recycling back to NAD+.”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
The NADHCYT transients decrease with inhibition of glycolysis but not of the MAS.
“The NADHCYT transients decrease with inhibition of glycolysis but not of the MAS, indicating that increased neuronal glycolysis upon stimulation is the main cause of the NADHCYT transients.”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
Pharmacologic blockade of MCT or of LDH abolishes the elevation of NADHCYT in response to exogenous lactate but not in response to stimulation.
“Pharmacologic blockade of MCT or of LDH abolishes the elevation of NADHCYT in response to exogenous lactate but not in response to stimulation, which rules out a role of lactate import in producing the transient increases in neuronal NADHCYT.”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
In dentate granule neurons, MCT inhibition led to higher peaks of NADHCYT as well as smaller dips in glucose, suggesting that elevated NADHCYT also exerted back pressure on glycolysis.
“In dentate granule neurons, MCT inhibition led to higher peaks of NADHCYT as well as smaller dips in glucose, suggesting that the elevated NADHCYT also exerted back pressure on glycolysis, presumably on the GAPDH equilibrium (Díaz-García et al., 2017).”
From Fueling thought: Management of glycolysis and oxidative phosphorylation in neuronal metabolism (2018) · cites this paper as Díaz-García et al., 2017
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Cell type- and brain region-resolved mouse brain proteome
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InfluentialEvidence Supporting the Existence of an Activity-Dependent Astrocyte-Neuron Lactate Shuttle
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InfluentialNeural activity triggers neuronal oxidative metabolism followed by astrocytic glycolysis
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“(B) Individual traces from a cell in the filmstrip illustrate the time course of synaptically stimulated transients in Peredox (top) and RCaMP1h lifetimes (bottom).”
InfluentialCirculation and Energy Metabolism of the Brain
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InfluentialBrain lactate metabolism: the discoveries and the controversies
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“The ultimate fate of the exported lactate may be a combination of ‘‘catch-up’’ oxidation by many neighboring brain cells (and by the stimulated neurons themselves), as well as some net lactate excretion from the brain (Dienel, 2012; Glenn et al., 2015), particularly when activation is strong and synchronous, as in epi…”
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Direct neuronal glucose uptake heralds activity-dependent increases in cerebral metabolism
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“In vivomeasurements to learn which cell type shows greater stimulated uptake of glucose analogs have given conflicting results (Chuquet et al., 2010; Lundgaard et al., 2015), perhaps because the fluorescent glucose derivatives used are substantially different from glucose in structure and size;…”
Hu, H., Juvekar, A., Lyssiotis, C. A., Lien, E. C., Albeck, J. G., Oh, D., Varma, G., Hung, Y. P., Ullas, S., Lauring, J. D., et al. (2016) · Cell · doi:10.1016/j.cell.2015.12.042 · Cited by 374 · cited 2× · see citing works
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InfluentialCa2+-dependent changes in the mitochondrial energetics in single dissociated mouse sensory neurons
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GLUT4 Mobilization Supports Energetic Demands of Active Synapses
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Glycolytic enzymes localize to synapses under energy stress to support synaptic function
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“Next we applied the MCT inhibitor AR-C155858 (2 mM), and observed a small decline in the resting NADHCYT (as discussed below, this is consistent with some astrocyte-toneuron lactate shuttling at rest, as previously suspected; Mongeon et al., 2016).”
InfluentialAstrocytes Couple Synaptic Activity to Glucose Utilization in the Brain
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“Proponents of the ANLS have argued that neurons preferentially use this astrocyte-produced lactate rather than glucose (Magistretti and Pellerin, 1999).”
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The CA3 “backprojection” to the dentate gyrus
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“Nevertheless, it is known that hilar stimulation triggers synaptic transmission between mossy fibers (DGNs axons) and CA3 pyramidal neurons, which send backprojections to the dentate gyrus (Scharfman, 2007).”
Chuquet, J., Quilichini, P., Nimchinsky, E. A., & Buzsáki, G. (2010) · The Journal of Neuroscience · doi:10.1523/jneurosci.0762-10.2010 · Cited by 217 · cited 2× · see citing works
“In vivomeasurements to learn which cell type shows greater stimulated uptake of glucose analogs have given conflicting results (Chuquet et al., 2010; Lundgaard et al., 2015), perhaps because the fluorescent glucose derivatives used are substantially different from glucose in structure and size;…”
Chronic cellular imaging of mouse visual cortex during operant behavior and passive viewing
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“Lactate Import Does Not Contribute to Neuronal NADHCYT Transients It remains possible that astrocytes depend on other stimuli (e.g., K+ release from neurons) for strong stimulation of lactate release (Peng et al., 1994; Bittner et al., 2011).”
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“The ANLS hypothesis continues to generate controversy in the literature (Hertz, 2004; Chuquet et al., 2010; Patel et al., 2014; Lundgaard et al., 2015).”
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“The ultimate fate of the exported lactate may be a combination of ‘‘catch-up’’ oxidation by many neighboring brain cells (and by the stimulated neurons themselves), as well as some net lactate excretion from the brain (Dienel, 2012; Glenn et al., 2015), particularly when activation is strong and synchronous, as in epi…”
Madsen, P. L., Cruz, N. F., Sokoloff, L., & Dienel, G. A. (1999) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1097/00004647-199904000-00005 · Cited by 174 · cited 1× · see citing works
“It is generally agreed that the ‘‘resting’’ brain, under normal metabolic circumstances, consumes glucose and metabolizes it nearly completely to CO2 (Clarke and Sokoloff, 1994; Madsen et al., 1999).”
Dienel, G. A. (2017) · Journal of Neuroscience Research · doi:10.1002/jnr.24015 · Cited by 168 · cited 1× · see citing works
“Although there are strong arguments against the logic of the ANLS on its face (Dienel, 2017), there has been little conclusive evidence at the cellular level.”
Mapping oxygen concentration in the awake mouse brain
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The redox switch/redox coupling hypothesis
Cerdán, S., Rodrigues, T. B., Sierra, A., Benito, M., Fonseca, L. L., Fonseca, C. P., & García-Martín, M. L. (2006) · Neurochemistry International · doi:10.1016/j.neuint.2005.12.036 · Cited by 146 · cited 1× · see citing works
“These observations under resting conditions are compatible with higher lactate production by astrocytes and a redox gradient that would favor lactate transfer to neurons (see also Cerdán et al., 2006).”
Glutamate mediates acute glucose transport inhibition in hippocampal neurons
Porras, O. H., Loaiza, A., & Barros, L. F. (2004) · The Journal of Neuroscience · doi:10.1523/jneurosci.1882-04.2004 · Cited by 139 · cited 1× · see citing works
“This argues that the two effects are mechanistically connected, and thus it argues against the idea that the glucose dips result from a reported activity-induced decrease in glucose transport (Porras et al., 2004).”
The astrocyte-neuron lactate shuttle: a challenge of a challenge
Hertz, L. (2004) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1097/00004647-200411000-00008 · Cited by 124 · cited 1× · see citing works
“The ANLS hypothesis continues to generate controversy in the literature (Hertz, 2004; Chuquet et al., 2010; Patel et al., 2014; Lundgaard et al., 2015).”
Ivanov, A. I., Malkov, A. E., Waseem, T., Mukhtarov, M., Buldakova, S., Gubkina, O., Zilberter, M., & Zilberter, Y. (2014) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1038/jcbfm.2013.222 · Cited by 113 · cited 4× · see citing works
“Measurements of oxygen levels in brain slices indicate that oxygen consumption does increase promptly in response to stimulation (Hall et al., 2012; Ivanov et al., 2014), suggesting a coordinated response of both glycolysis and oxidative phosphorylation to meet increased demand.”
InfluentialDirect Measurement of Extracellular Lactate in the Human Hippocampus During Spontaneous Seizures
During, M. J., Fried, I., Leone, P., Katz, A., & Spencer, D. D. (1994) · Journal of Neurochemistry · doi:10.1046/j.1471-4159.1994.62062356.x · Cited by 111 · cited 2× · see citing works
“, 2015), particularly when activation is strong and synchronous, as in epilepsy (Collins et al., 1970; During et al., 1994).”
Cerebral energy metabolism during electroshock seizures in mice
Collins, R., Jb, P., & Plum, F. (1970) · American Journal of Physiology-Legacy Content · doi:10.1152/ajplegacy.1970.218.4.943 · Cited by 110 · cited 2× · see citing works
“, 2015), particularly when activation is strong and synchronous, as in epilepsy (Collins et al., 1970; During et al., 1994).”
Peng, L., Zhang, X., & Leif, H. (1994) · Brain Research · doi:10.1016/0006-8993(94)90475-8 · Cited by 109 · cited 2× · see citing works
“Lactate Import Does Not Contribute to Neuronal NADHCYT Transients It remains possible that astrocytes depend on other stimuli (e.g., K+ release from neurons) for strong stimulation of lactate release (Peng et al., 1994; Bittner et al., 2011).”
Shuttleworth, C. W. (2010) · Neurochemistry International · doi:10.1016/j.neuint.2009.12.015 · Cited by 104 · cited 7× · see citing works
“, 2004), it is almost certainly due instead to replenishment of mitochondrial NADH in neurons bymultiplemeans (Brennan et al., 2006; Shuttleworth, 2010; Berndt et al., 2015): stimulation of tricarboxylic acid cycle dehydrogenases by calcium as well as increased shuttling of NADH from the cytosol (which may itself be s…”
InfluentialMongeon, R., Venkatachalam, V., & Yellen, G. (2016) · Antioxidants & Redox Signaling · doi:10.1089/ars.2015.6593 · Cited by 100 · cited 4× · see citing works
“The fluorescence lifetime (LT) of the sensor protein, measured in nanoseconds, gives a direct report of sensor occupancy and thus of the cytosolic NADH:NAD+ ratio (Mongeon et al., 2016).”
InfluentialSelf-citationBrennan, A. M., Connor, J. A., & Shuttleworth, C. W. (2006) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1038/sj.jcbfm.9600292 · Cited by 97 · cited 3× · see citing works
“…of astrocytes (Kasischke et al., 2004), it is almost certainly due instead to replenishment of mitochondrial NADH in neurons bymultiplemeans (Brennan et al., 2006; Shuttleworth, 2010; Berndt et al., 2015): stimulation of tricarboxylic acid cycle dehydrogenases by calcium as well as…”
Ovens, M. J., Manoharan, C., Wilson, M. C., et al. (2010) · Biochemical Journal · doi:10.1042/bj20100890 · Cited by 88 · cited 5× · see citing works
“Next we applied the MCT inhibitor AR-C155858 (2 mM), and observed a small decline in the resting NADHCYT (as discussed below, this is consistent with some astrocyte-toneuron lactate shuttling at rest, as previously suspected; Mongeon et al., 2016).”
InfluentialQuantitative two-photon imaging of fluorescent biosensors
Yellen, G., & Mongeon, R. (2015) · Current Opinion in Chemical Biology · doi:10.1016/j.cbpa.2015.05.024 · Cited by 85 · cited 8× · see citing works
“(B) Individual traces from a cell in the filmstrip illustrate the time course of synaptically stimulated transients in Peredox (top) and RCaMP1h lifetimes (bottom).”
InfluentialSelf-citationSingh, P. K., Salih, M., Leddy, J. J., & Tuana, B. S. (2004) · Journal of Biological Chemistry · doi:10.1074/jbc.m402282200 · Cited by 81 · cited 1× · see citing works
“However, it remains to be learned whether this correlation is produced by a direct modulation of glycolytic rate by cytosolic calcium (e.g., Singh et al., 2004; Kim et al., 2016; Nicholson-Fish et al., 2016; Hu et al., 2016), by indirect effects due to Ca2+ uptake by mitochondria (Duchen, 1992;…”
Schuchmann, S., Kovacs, R., Kann, O., Heinemann, U., & Buchheim, K. (2001) · Brain Research Protocols · doi:10.1016/s1385-299x(01)00080-0 · Cited by 75 · cited 2× · see citing works
“Transients in Cytosolic NADH Do Not Simply Reflect Mitochondrial NAD(P)H Transients Many studies of neurons and brain slices have used changes in ‘‘NAD(P)H’’ autofluorescence to monitor metabolic changes (Chance et al., 1962; Duchen, 1992; Schuchmann et al., 2001; Shuttleworth, 2010); these small fluorescence changes…”
Berndt, N., Kann, O., & Holzhütter, H.-G. (2015) · Journal of Cerebral Blood Flow & Metabolism · doi:10.1038/jcbfm.2015.70 · Cited by 56 · see citing works
Langemann, H., Alessandri, B., Mendelowitsch, A., Feuerstein, T. J., Landolt, H., & Gratzl, O. (2001) · Neurological Research · doi:10.1179/016164101101198785 · Cited by 50 · cited 3× · see citing works
“These experiments were done in the presence of 2 mM lactate in the bath, comparable with measured extracellular lactate in the brain (Langemann et al., 2001), to provide continued support of mitochondrial oxidation, which is clearly important for sustained neuronal health.”
InfluentialATP utilization and provision in fast-twitch skeletal muscle during tetanic contractions
Spriet, L. L. (1989) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.1989.257.4.e595 · Cited by 40 · cited 1× · see citing works
“However, it is known that in the evolution of skeletal muscle, themuscle fibers with themost dynamic energy requirements (the fast-twitch fibers) tend to rely on glycolysis for prompt energy production (Crow and Kushmerick, 1982; Spriet, 1989).”
Satrústegui, J., & Bak, L. K. (2015) · Neurochemical Research · doi:10.1007/s11064-015-1652-8 · Cited by 33 · cited 2× · see citing works
“…glycolytic rate by cytosolic calcium (e.g., Singh et al., 2004; Kim et al., 2016; Nicholson-Fish et al., 2016; Hu et al., 2016), by indirect effects due to Ca2+ uptake by mitochondria (Duchen, 1992; Satrústegui and Bak, 2015), or simply by the ATP burden produced by the demands of Ca2+ extrusion.”
AMPK, a metabolic sensor, is involved in isoeugenol-induced glucose uptake in muscle cells
Kim, N., Lee, J. O., Lee, H., Lee, Y. W., Kim, H. I., Kim, S. J., Park, S. H., Lee, C. S., Ryoo, S. W., Hwang, G., et al. (2015) · Journal of Endocrinology · doi:10.1530/joe-15-0302 · Cited by 22 · cited 2× · see citing works
“However, it remains to be learned whether this correlation is produced by a direct modulation of glycolytic rate by cytosolic calcium (e.g., Singh et al., 2004; Kim et al., 2016; Nicholson-Fish et al., 2016; Hu et al., 2016), by indirect effects due to Ca uptake by mitochondria (Duchen, 1992; Satrústegui and Bak, 2015…”
Nicholson-Fish, J. C., Cousin, M. A., & Smillie, K. J. (2015) · Neurochemical Research · doi:10.1007/s11064-015-1663-5 · Cited by 20 · cited 2× · see citing works
“However, it remains to be learned whether this correlation is produced by a direct modulation of glycolytic rate by cytosolic calcium (e.g., Singh et al., 2004; Kim et al., 2016; Nicholson-Fish et al., 2016; Hu et al., 2016), by indirect effects due to Ca uptake by mitochondria (Duchen, 1992; Satrústegui and Bak, 2015…”
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Lactate in the brain: from metabolic end-product to signalling molecule
Magistretti, P. J., & Allaman, I. (2018) · Nature Reviews Neuroscience · doi:10.1038/nrn.2018.19 · Cited by 1,298 · see citing works
Brain Glucose Metabolism: Integration of Energetics with Function
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Astrocyte-neuron metabolic cooperation shapes brain activity
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ApoE4 Impairs Neuron-Astrocyte Coupling of Fatty Acid Metabolism
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“Fluorescent biosensor measurement of NADHCYT in neurons during excitation has helped to resolve the role of glycolysis and intercellular lactate transport in the acute metabolic response (Díaz-García et al., 2017).”
BackgroundSelf-citationGlutamate metabolism and recycling at the excitatory synapse in health and neurodegeneration.
Andersen, J. V., Markussen, K., Jakobsen, E., Schousboe, A., Waagepetersen, H., Rosenberg, P., & Aldana, B. (2021) · Neuropharmacology · doi:10.1016/j.neuropharm.2021.108719 · Cited by 331 · see citing works
“Although widely endorsed (Mächler et al., 2016; Suzuki et al., 2011), the dependence of neurons on astrocyte-derived lactate during periods of increased activity has been challenged and has proved difficult to demonstrate in vivo (Diaz-Garcia et al., 2017; Dienel, 2017).”
Protein lactylation induced by neural excitation
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“Indeed, neurons also take up and metabolize glucose and increase glucose consumption in an activity-dependent manner [6, 47, 144].”
BackgroundPleiotropic Mitochondria: The Influence of Mitochondria on Neuronal Development and Disease
Rangaraju, V., Lewis, T. L., Hirabayashi, Y., Bergami, M., Motori, E., Cartoni, R., Kwon, S., & Courchet, J. (2019) · Journal of Neuroscience · doi:10.1523/jneurosci.1157-19.2019 · Cited by 257 · see citing works
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BackgroundMyelin dynamics: protecting and shaping neuronal functions
Saab, A. S., & Nave, K. (2017) · Current Opinion in Neurobiology · doi:10.1016/j.conb.2017.09.013 · Cited by 259 · see citing works
Alzheimer’s Disease: From Firing Instability to Homeostasis Network Collapse
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Pekkurnaz, G., & Wang, X. (2022) · Nature Metabolism · doi:10.1038/s42255-022-00594-w · Cited by 195 · see citing works
Rose, J., Brian, C., Pappa, A., Panayiotidis, M. I., & Franco, R. (2020) · Frontiers in Neuroscience · doi:10.3389/fnins.2020.536682 · Cited by 196 · see citing works
Pathophysiological subtypes of Alzheimer’s disease based on cerebrospinal fluid proteomics
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“Neurons can increase neuronal glycolysis during neuronal stimulation (Dı́az-Garcı́a et al., 2017).”
BackgroundMitochondria, Metabolism, and Redox Mechanisms in Psychiatric Disorders
Kim, Y., Vadodaria, K. C., Lenkei, Z., Kato, T., Gage, F. H., Marchetto, M. C., & Santos, R. (2018) · Antioxidants and Redox Signaling · doi:10.1089/ars.2018.7606 · Cited by 189 · see citing works
Lactate from astrocytes fuels learning-induced mRNA translation in excitatory and inhibitory neurons
Descalzi, G., Gao, V., Steinman, M. Q., Suzuki, A., & Alberini, C. M. (2019) · Communications Biology · doi:10.1038/s42003-019-0495-2 · Cited by 188 · see citing works
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Energy Metabolism Decline in the Aging Brain—Pathogenesis of Neurodegenerative Disorders
Błaszczyk, J. W. (2020) · Metabolites · doi:10.3390/metabo10110450 · Cited by 162 · see citing works
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“Stimulation of neuronal glycolysis by electrical activity was inferred from a rise in neuronal NADH/NAD+ that was insensitive to MCT2 blockage, which was interpreted as evidence against ANLS (Diaz-Garcia et al. 2017).”
BackgroundInfluentialmTOR/AMPK signaling in the brain: Cell metabolism, proteostasis and survival
Garza-Lombó, C., Schroder, A. L., Reyes‐Reyes, E. M., & Franco, R. (2018) · Current Opinion in Toxicology · doi:10.1016/j.cotox.2018.05.002 · Cited by 159 · see citing works
Glial Connexins and Pannexins in the Healthy and Diseased Brain
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Glycerol-3-phosphate biosynthesis regenerates cytosolic NAD+ to alleviate mitochondrial disease
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Brain energy metabolism: Astrocytes in neurodegenerative diseases.
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Myeloid Cells in Glioblastoma Microenvironment
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The role of astrocyte structural plasticity in regulating neural circuit function and behavior
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“This energy source could be significant in meet- ing the metabolic demands of neurons during wake (de Tredern et al., 2021; Díaz-García et al., 2017).”
BackgroundJurcău, A. (2021) · International Journal of Molecular Sciences · doi:10.3390/ijms222111847 · Cited by 150 · see citing works
Synapses: The Brain’s Energy-Demanding Sites
Faria‐Pereira, A., & Morais, V. A. (2022) · International Journal of Molecular Sciences · doi:10.3390/ijms23073627 · Cited by 145 · see citing works
Neurons require glucose uptake and glycolysis in vivo
Li, H., Guglielmetti, C., Sei, Y. J., Zilberter, M. Y., Page, L. M. L., Shields, L. Y., Yang, J. L., Nguyen, K., Tiret, B., Gao, X. Z., et al. (2023) · Cell Reports · doi:10.1016/j.celrep.2023.112335 · Cited by 142 · see citing works
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Astrocyte metabolism and signaling pathways in the CNS
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AMPK-Regulated Astrocytic Lactate Shuttle Plays a Non-Cell-Autonomous Role in Neuronal Survival
Muraleedharan, R., Gawali, M. V., Tiwari, D., Sukumaran, A., Oatman, N., Anderson, J., Nardini, D., Bhuiyan, M. A. N., Tkáč, I., Ward, A. L., et al. (2020) · Cell Reports · doi:10.1016/j.celrep.2020.108092 · Cited by 132 · see citing works
Arousal-induced cortical activity triggers lactate release from astrocytes
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Non-Canonical Control of Neuronal Energy Status by the Na+ Pump
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Brown adipocyte glucose metabolism: a heated subject
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“What ensued was a heated and lengthy debate about precisely how and where glucose is handled by brain cells to power neuronal activity, with glycolytic and oxidative processes at presynaptic and postsynaptic sites as well as in astrocytes being tabled [2 – 5].”
Heterogeneity of Astrocytes in Grey and White Matter
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Lipid metabolism in astrocytic structure and function
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A turquoise fluorescence lifetime-based biosensor for quantitative imaging of intracellular calcium
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Adaptive responses to neurodegenerative stress in glaucoma
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Neurons rely on glucose rather than astrocytic lactate during stimulation
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Self-citationPowerhouse of the mind: mitochondrial plasticity at the synapse
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Mechanisms for the maintenance and regulation of axonal energy supply
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Self-citationGSEA of mouse and human mitochondriomes reveals fatty acid oxidation in astrocytes
Eraso‐Pichot, A., Brasó‐Vives, M., Golbano, A., Menacho, C., Claro, E., Galea, E., & Masgrau, R. (2018) · Glia · doi:10.1002/glia.23330 · Cited by 105 · see citing works
“Results in favor of or against the hypothesis have been reported from animal studies in vivo (Ashrafi & Ryan, 2017; Diaz-Garcia et al., 2017; Mächler et al., 2016), and illustrate the complexity of brain metabolism.”
ResultMoutaux, E., Charlot, B., Genoux, A., Saudou, F., & Cazorla, M. (2018) · Lab on a Chip · doi:10.1039/c8lc00694f · Cited by 100 · see citing works
Lactate is an energy substrate for rodent cortical neurons and enhances their firing activity
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“This lactate 459 sensitivity is consistent with lactate transport and oxidization in hypothalamic and 460 cortical neurons (Ainscow et al., 2002;Sada et al., 2015;Diaz-Garcia et al., 2017) 461 which are low in beta cells (Sekine et al., 1994;Pullen et al., 2011).”
BackgroundA general method for the development of multicolor biosensors with large dynamic ranges
Hellweg, L., Edenhofer, A., Barck, L., Huppertz, M.-C., Frei, M. S., Tarnawski, M., Bergner, A., Koch, B., Johnsson, K., & Hiblot, J. (2023) · Nature Chemical Biology · doi:10.1038/s41589-023-01350-1 · Cited by 108 · see citing works
Brain energy metabolism: A roadmap for future research
Rae, C. D., Baur, J. A., Borges, K., Dienel, G. A., Díaz‐García, C. M., Douglass, S. R., Drew, K. L., Duarte, J. M. N., Durán, J., Kann, O., et al. (2024) · Journal of Neurochemistry · doi:10.1111/jnc.16032 · Cited by 109 · see citing works
Self-citationDíaz‐García, C. M., Lahmann, C., Martínez‐François, J. R., Li, B., Koveal, D., Nathwani, N., Rahman, M., Keller, J. P., Marvin, J. S., Looger, L. L., et al. (2019) · Journal of Neuroscience Research · doi:10.1002/jnr.24433 · Cited by 97 · see citing works
Self-citationDíaz‐García, C. M., Meyer, D. J., Nathwani, N., Rahman, M., Martínez‐François, J. R., & Yellen, G. (2021) · eLife · doi:10.7554/elife.64821 · Cited by 95 · see citing works
Self-citationEmerging roles of brain metabolism in cognitive impairment and neuropsychiatric disorders
Morella, I., Brambilla, R., & Morè, L. (2022) · Neuroscience & Biobehavioral Reviews · doi:10.1016/j.neubiorev.2022.104892 · Cited by 96 · see citing works
Bak, L. K., & Walls, A. B. (2018) · The Journal of Physiology · doi:10.1113/jp274945 · Cited by 93 · see citing works
“Further, Lundgaard et al. (2015) and Diaz-Garcia et al. (2017), employing a near-infrared 2-deoxyglucose probe and redox biosensors, respectively, showed that glucose is metabolised by neurons in an activity-dependent manner in situ in awake mice.”
Skotte, N. H., Andersen, J. V., Santos, A., Aldana, B. I., Willert, C. W., Nørremølle, A., Waagepetersen, H. S., & Nielsen, M. L. (2018) · Cell Reports · doi:10.1016/j.celrep.2018.04.052 · Cited by 94 · see citing works
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- Authors
- Díaz-García, C. M., Mongeon, R., Lahmann, C., Koveal, D., Zucker, H., & Yellen, G.
- Affiliations
- Harvard University (US)
- Corresponding author
- Yellen, Gary
- Venue
- Cell Metabolism
- Publisher
- Elsevier BV
- Published
- 2017-08
- Volume
- 26
- Issue
- 2
- Pages
- 361-374.e4
- ISSN
- 1550-4131 (ISSN-L)
- PMC
- PMC5559896
- OpenAlex
- W2739924689
- Semantic Scholar
- a96cd5dd74379072ec837b55007abc76f4f54521
- Cited by
- 466
- References
- 71
- Citations by year
- 2026: 39 · 2025: 62 · 2024: 50 · 2023: 52 · 2022: 51 · 2021: 62 · 2020: 60 · 2019: 40 · 2018: 42 · 2017: 7 · 2015: 1
- FWCI
- 19.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- NIH (R01 NS055031, DP1 EB016985, F32 NS080455, F32 NS093784, F32 NS100331)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Keywords
- lactate utilization, brain energy metabolism, neurostimulation, astrocytes, glutamate release, glucose utilization, oxidative metabolism, hippocampal slices, brain energy demand
- MeSH terms
- Animals, Glycolysis, Hippocampus, Male, Neurons, Lactic Acid, Mice
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