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PMID: 12122046 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Presynaptic mitochondrial calcium sequestration influences transmission at mammalian central synapses.

Billups B, Forsythe ID

Abstract

Beyond their role in generating ATP, mitochondria have a high capacity to sequester calcium. The interdependence of these functions and limited access to presynaptic compartments makes it difficult to assess the role of sequestration in synaptic transmission. We addressed this important question using the calyx of Held as a model glutamatergic synapse by combining patch-clamp with a novel mitochondrial imaging method. Presynaptic calcium current, mitochondrial calcium concentration ([Ca(2+)](mito), measured using rhod-2 or rhod-FF), cytoplasmic calcium concentration ([Ca(2+)](cyto), measured using fura-FF), and the postsynaptic current were monitored during synaptic transmission. Presynaptic [Ca(2+)](cyto) rose to 8.5 +/- 1.1 microM and decayed rapidly with a time constant of 45 +/- 3 msec; presynaptic [Ca(2+)](mito) also rose rapidly to >5 microM but decayed slowly with a half-time of 1.5 +/- 0.4 sec. Mitochondrial depolarization with rotenone and carbonyl cyanide p-trifluoromethoxyphenylhydrazone abolished mitochondrial calcium rises and slowed the removal of [Ca(2+)](cyto) by 239 +/- 22%. Using simultaneous presynaptic and postsynaptic patch clamp, combined with presynaptic mitochondrial and cytoplasmic imaging, we investigated the influence of mitochondrial calcium sequestration on transmitter release. Depletion of ATP to maintain mitochondrial membrane potential was blocked with oligomycin, and ATP was provided in the patch pipette. Mitochondrial depolarization raised [Ca(2+)](cyto) and reduced transmitter release after short EPSC trains (100 msec, 200 Hz); this effect was reversed by raising mobile calcium buffering with EGTA. Our results suggest a new role for presynaptic mitochondria in maintaining transmission by accelerating recovery from synaptic depression after periods of moderate activity. Without detectable thapsigargin-sensitive presynaptic calcium stores, we conclude that mitochondria are the major organelle regulating presynaptic calcium at central glutamatergic terminals.

MeSH Terms
Adenosine Triphosphate/metabolism Animals Brain Stem/cytology,drug effects,physiology Calcium/metabolism Calcium Signaling/drug effects,physiology Cytoplasm/metabolism Electric Stimulation Enzyme Inhibitors/pharmacology Excitatory Postsynaptic Potentials/drug effects,physiology Fluorescent Dyes Glutamic Acid/metabolism In Vitro Techniques Mitochondria/drug effects,metabolism Oligomycins/pharmacology Patch-Clamp Techniques Presynaptic Terminals/drug effects,metabolism Rats Synapses/drug effects,metabolism Synaptic Transmission/drug effects,physiology Uncoupling Agents/pharmacology
Chemicals
Enzyme Inhibitors Fluorescent Dyes Oligomycins Uncoupling Agents Glutamic Acid Adenosine Triphosphate Calcium
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Billups Brian
Department of Cell Physiology and Pharmacology, University of Leicester, Leicester LE1 9HN, United Kingdom.
Forsythe Ian D
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Article Info
Journal
The Journal of neuroscience : the official journal of the Society for Neuroscience
Abbr.
J Neurosci
ISSN
1529-2401
Published
2002-07-15
Pages
5840-7
Language
English
Region
United States
NLM ID
8102140
PMCID
PMC6757942
Subset
IM
Grants
Wellcome Trust · United Kingdom
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