Cargando…

Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus

A mild ischemic load applied after a lethal ischemic insult reduces the subsequent ischemia–reperfusion injury, and is called ischemic postconditioning (PostC). We studied the effect of ischemic PostC on synaptic glutamate release using a whole-cell patch-clamp technique. We recorded spontaneous exc...

Descripción completa

Detalles Bibliográficos
Autores principales: Yokoyama, Shohei, Nakagawa, Ichiro, Ogawa, Yoichi, Morisaki, Yudai, Motoyama, Yasushi, Park, Young Su, Saito, Yasuhiko, Nakase, Hiroyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6461229/
https://www.ncbi.nlm.nih.gov/pubmed/30978206
http://dx.doi.org/10.1371/journal.pone.0215104
_version_ 1783410465428209664
author Yokoyama, Shohei
Nakagawa, Ichiro
Ogawa, Yoichi
Morisaki, Yudai
Motoyama, Yasushi
Park, Young Su
Saito, Yasuhiko
Nakase, Hiroyuki
author_facet Yokoyama, Shohei
Nakagawa, Ichiro
Ogawa, Yoichi
Morisaki, Yudai
Motoyama, Yasushi
Park, Young Su
Saito, Yasuhiko
Nakase, Hiroyuki
author_sort Yokoyama, Shohei
collection PubMed
description A mild ischemic load applied after a lethal ischemic insult reduces the subsequent ischemia–reperfusion injury, and is called ischemic postconditioning (PostC). We studied the effect of ischemic PostC on synaptic glutamate release using a whole-cell patch-clamp technique. We recorded spontaneous excitatory post-synaptic currents (sEPSCs) from CA1 pyramidal cells in mouse hippocampal slices. The ischemic load was perfusion of artificial cerebrospinal fluid (ACSF) equilibrated with mixed gas (95% N(2) and 5% CO(2)). The ischemic load was applied for 7.5 min, followed by ischemic PostC 30 s later, consisting of three cycles of 15 s of reperfusion and 15 s of re-ischemia. We found that a surging increase in sEPSCs frequency occurred during the immediate-early reperfusion period after the ischemic insult. We found a significant positive correlation between cumulative sEPSCs and the number of dead CA1 neurons (r = 0.70; p = 0.02). Ischemic PostC significantly suppressed this surge of sEPSCs. The mitochondrial K(ATP) (mito-K(ATP)) channel opener, diazoxide, also suppressed the surge of sEPSCs when applied for 15 min immediately after the ischemic load. The mito-K(ATP) channel blocker, 5-hydroxydecanoate (5-HD), significantly attenuated the suppressive effect of both ischemic PostC and diazoxide application on the surge of sEPSCs. These results suggest that the opening of mito-K(ATP) channels is involved in the suppressive effect of ischemic PostC on synaptic glutamate release and protection against neuronal death. We hypothesize that activation of mito-K(ATP) channels prevents mitochondrial malfunction and breaks mutual facilitatory coupling between glutamate release and Ca(2+) entry at presynaptic sites.
format Online
Article
Text
id pubmed-6461229
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-64612292019-05-03 Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus Yokoyama, Shohei Nakagawa, Ichiro Ogawa, Yoichi Morisaki, Yudai Motoyama, Yasushi Park, Young Su Saito, Yasuhiko Nakase, Hiroyuki PLoS One Research Article A mild ischemic load applied after a lethal ischemic insult reduces the subsequent ischemia–reperfusion injury, and is called ischemic postconditioning (PostC). We studied the effect of ischemic PostC on synaptic glutamate release using a whole-cell patch-clamp technique. We recorded spontaneous excitatory post-synaptic currents (sEPSCs) from CA1 pyramidal cells in mouse hippocampal slices. The ischemic load was perfusion of artificial cerebrospinal fluid (ACSF) equilibrated with mixed gas (95% N(2) and 5% CO(2)). The ischemic load was applied for 7.5 min, followed by ischemic PostC 30 s later, consisting of three cycles of 15 s of reperfusion and 15 s of re-ischemia. We found that a surging increase in sEPSCs frequency occurred during the immediate-early reperfusion period after the ischemic insult. We found a significant positive correlation between cumulative sEPSCs and the number of dead CA1 neurons (r = 0.70; p = 0.02). Ischemic PostC significantly suppressed this surge of sEPSCs. The mitochondrial K(ATP) (mito-K(ATP)) channel opener, diazoxide, also suppressed the surge of sEPSCs when applied for 15 min immediately after the ischemic load. The mito-K(ATP) channel blocker, 5-hydroxydecanoate (5-HD), significantly attenuated the suppressive effect of both ischemic PostC and diazoxide application on the surge of sEPSCs. These results suggest that the opening of mito-K(ATP) channels is involved in the suppressive effect of ischemic PostC on synaptic glutamate release and protection against neuronal death. We hypothesize that activation of mito-K(ATP) channels prevents mitochondrial malfunction and breaks mutual facilitatory coupling between glutamate release and Ca(2+) entry at presynaptic sites. Public Library of Science 2019-04-12 /pmc/articles/PMC6461229/ /pubmed/30978206 http://dx.doi.org/10.1371/journal.pone.0215104 Text en © 2019 Yokoyama et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Yokoyama, Shohei
Nakagawa, Ichiro
Ogawa, Yoichi
Morisaki, Yudai
Motoyama, Yasushi
Park, Young Su
Saito, Yasuhiko
Nakase, Hiroyuki
Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus
title Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus
title_full Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus
title_fullStr Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus
title_full_unstemmed Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus
title_short Ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial ATP-dependent potassium channels in the mouse hippocampus
title_sort ischemic postconditioning prevents surge of presynaptic glutamate release by activating mitochondrial atp-dependent potassium channels in the mouse hippocampus
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6461229/
https://www.ncbi.nlm.nih.gov/pubmed/30978206
http://dx.doi.org/10.1371/journal.pone.0215104
work_keys_str_mv AT yokoyamashohei ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT nakagawaichiro ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT ogawayoichi ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT morisakiyudai ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT motoyamayasushi ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT parkyoungsu ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT saitoyasuhiko ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus
AT nakasehiroyuki ischemicpostconditioningpreventssurgeofpresynapticglutamatereleasebyactivatingmitochondrialatpdependentpotassiumchannelsinthemousehippocampus