Cited by 56Neuroscience and Neuropharmacology ResearchMitochondrial Function and PathologyIon channel regulation and function

Glycolysis selectively shapes the presynaptic action potential waveform

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Lujan, Brendan, Kushmerick, Christopher, Banerjee, Tania Das, Dagda, Ruben K., Renden, Robert·2016·Journal of Neurophysiology

Abstract

Mitochondria are major suppliers of cellular energy in neurons; however, utilization of energy from glycolysis vs. mitochondrial oxidative phosphorylation (OxPhos) in the presynaptic compartment during neurotransmission is largely unknown. Using presynaptic and postsynaptic recordings from the mouse calyx of Held, we examined the effect of acute selective pharmacological inhibition of glycolysis or mitochondrial OxPhos on multiple mechanisms regulating presynaptic function. Inhibition of glycolysis via glucose depletion and iodoacetic acid (1 mM) treatment, but not mitochondrial OxPhos, rapidly altered transmission, resulting in highly variable, oscillating responses. At reduced temperature, this same treatment attenuated synaptic transmission because of a smaller and broader presynaptic action potential (AP) waveform. We show via experimental manipulation and ion channel modeling that the altered AP waveform results in smaller Ca2+ influx, resulting in attenuated excitatory postsynaptic currents (EPSCs). In contrast, inhibition of mitochondria-derived ATP production via extracellular pyruvate depletion and bath-applied oligomycin (1 μM) had no significant effect on Ca2+ influx and did not alter the AP waveform within the same time frame (up to 30 min), and the resultant EPSC remained unaffected. Glycolysis, but not mitochondrial OxPhos, is thus required to maintain basal synaptic transmission at the presynaptic terminal. We propose that glycolytic enzymes are closely apposed to ATP-dependent ion pumps on the presynaptic membrane. Our results indicate a novel mechanism for the effect of hypoglycemia on neurotransmission. Attenuated transmission likely results from a single presynaptic mechanism at reduced temperature: a slower, smaller AP, before and independent of any effect on synaptic vesicle release or receptor activity.

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Crossref · 10.1152/jn.00629.2016

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  1. Hirsch H, Euler KH, Schneider M. Recovery of the brain after complete ischemia in hypothermia. Pflügers Arch 265: 314–327, 1957. [DOI] [PubMed] [Google Scholar]

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Authors
Lujan, B., Kushmerick, C., Banerjee, T. D., Dagda, R. K., & Renden, R.
Affiliations
  • University of Nevada, Reno (US)
  • Universidade Federal de Minas Gerais (BR)
Corresponding author
Renden, Robert
Venue
Journal of Neurophysiology
Published
2016-12-01
Volume
116
Issue
6
Pages
2523-2540
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2509137173
Cited by
56
References
93
Citations by year
2026: 3 · 2025: 6 · 2024: 7 · 2023: 6 · 2022: 4 · 2021: 5 · 2020: 4 · 2019: 7 · 2018: 9 · 2017: 5
FWCI
3.94
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
HHS | NIH | National Institute of General Medical Sciences (NIGMS) (P20 GM103554)
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 › Molecular Biology › Ion channel regulation and function
Keywords
glycolysis, mitochondrial oxidative phosphorylation, calyx of Held, synaptic transmission, calcium influx, excitatory postsynaptic currents, iodoacetate, glucose depletion, oligomycin, hypoglycemia, temperature effects
MeSH terms
Action Potentials, Animals, Animals, Newborn, Antimetabolites, Brain Stem, Cells, Cultured, Cerebral Cortex, Deoxyglucose, Embryo, Mammalian, Enzyme Inhibitors, Glucose, Glycolysis, Indoleacetic Acids, Luminescent Proteins, Mice, Inbred C57BL, Models, Neurological, Neurons, Oligomycins, Presynaptic Terminals, Excitatory Postsynaptic Potentials, Iodoacetic Acid, Mice

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