Cited by 97Neuroscience and Neuropharmacology ResearchMitochondrial Function and PathologyAdvanced Fluorescence Microscopy Techniques

NAD(P)H fluorescence transients after synaptic activity in brain slices: predominant role of mitochondrial function

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Brennan, Angela M, Connor, John A, Shuttleworth, C William·2006·Journal of Cerebral Blood Flow & Metabolism

Abstract

Excitatory stimulation in hippocampal slices results in biphasic NAD(P)H fluorescence transients. Previous studies using differing stimulus protocols agreed that the oxidation phase is a consequence of mitochondrial metabolism, but the reduction phase has been attributed to (1) mitochondrial nicotinamide adenine dinucleotide (NADH) generation or (2) astrocytic glycolysis triggered by glutamate uptake. In an attempt to reconcile these two views, the present study examined NAD(P)H signals evoked by a wide range of stimulus durations (40 ms to 20 secs). A combination of ionotropic glutamate receptor (iGluR) antagonists (6-cyano-7-nitroquinoxaline-2,3-dione (CNQX), 2-amino-5-phosphonopentanoic acid (APV)) virtually abolished responses to brief stimuli (40 to 200 ms, 50 Hz), but a significant fraction of the signal elicited by extended stimulation (20 secs, 32 Hz) was resistant to CNQX/APV. Glycolysis was inhibited by removal of glucose and addition of 2-deoxyglucose (2DG) (10 mmol/L) or iodoacetic acid (IAA, 1 mmol/L). Pyruvate was provided as an alternative substrate for oxidative phosphorylation and the A1 receptor antagonist 1,3-Dipropyl-8-cyclopentylxanthine (DPCPX) included to prevent decreases in synaptic efficacy. If sufficient pyruvate was supplied, responses to brief and extended stimuli were unaffected by glycolytic inhibition and not significantly reduced by an inhibitor of glucose uptake (3-O-methyl glucose, 3 mmol/L). When timed to arrive at the peak of overshoots generated by extended synaptic stimulation, brief pyruvate applications (10 mmol/L, 2 mins) had little effect on evoked NAD(P)H increases. Flavoprotein autofluorescence transients after extended stimuli matched (with inverted sign) NAD(P)H responses. Responses to extended stimuli were not reduced by a nonselective inhibitor of glutamate uptake DL-Threo-beta-benzyloxyaspartic acid (TBOA). These results suggest that NAD(P)H transients report mitochondrial dynamics, rather than recruitment of glycolytic metabolism, over a wide range of stimulus intensities.

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Crossref · 10.1038/sj.jcbfm.9600292

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  • 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).”

    From Neuronal Stimulation Triggers Neuronal Glycolysis and Not Lactate Uptake (2017) · cites this paper as Brennan et al., 2006

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Authors
Brennan, A. M., Connor, J. A., & Shuttleworth, C. W.
Affiliations
University of New Mexico (US)
Corresponding author
Shuttleworth, C William
Venue
Journal of Cerebral Blood Flow & Metabolism
Published
2006-11
Volume
26
Issue
11
Pages
1389-1406
ISSN
  • 0271-678X (ISSN-L)
  • 1559-7016
OpenAlex
W2026777646
Cited by
97
References
51
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2021: 3 · 2020: 2 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 8 · 2015: 6 · 2014: 6 · 2013: 4 · 2012: 5
FWCI
3.54
Type
journal article
Language
en
Open access
Locations
  • Journal of Cerebral Blood Flow & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Neurological Disorders and Stroke (NS43458, R01NS043458)
  • National Center for Research Resources (RR-15636, P20RR015636)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
Keywords
mitochondrial metabolism, hippocampus, synaptic activity, glutamate uptake, ionotropic glutamate receptors, pyruvate, 2-deoxyglucose, 3-O-methylglucose, DPCPX, CNQX, APV, TBOA
MeSH terms
Animals, Bicuculline, Brain, Electric Stimulation, Flavoproteins, Fluorescence, Glycolysis, Male, Mice, Inbred C57BL, Mitochondria, NADP, Neuroglia, Neurons, Pyruvates, Synapses, 2-Amino-5-phosphonovalerate, Long-Term Potentiation, Excitatory Amino Acid Antagonists, Glutamic Acid, 6-Cyano-7-nitroquinoxaline-2,3-dione, GABA Antagonists, Excitatory Postsynaptic Potentials, Mice

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