mGluR1 antagonist decreases tyrosine phosphorylation of NMDA receptor and attenuates infarct size after transient focal cerebral ischemia

The contribution of metabotropic glutamate receptors to brain injury after in vivo cerebral ischemia remains to be determined. We investigated the effects of the metabotropic glutamate receptor 1 (mGluR1) antagonist LY367385 on brain injury after transient (90 min) middle cerebral artery occlusion i...

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Veröffentlicht in:Journal of neurochemistry 2008-06, Vol.105 (5), p.1625-1634
Hauptverfasser: Murotomi, Kazutoshi, Takagi, Norio, Takayanagi, Gen, Ono, Megumi, Takeo, Satoshi, Tanonaka, Kouichi
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container_end_page 1634
container_issue 5
container_start_page 1625
container_title Journal of neurochemistry
container_volume 105
creator Murotomi, Kazutoshi
Takagi, Norio
Takayanagi, Gen
Ono, Megumi
Takeo, Satoshi
Tanonaka, Kouichi
description The contribution of metabotropic glutamate receptors to brain injury after in vivo cerebral ischemia remains to be determined. We investigated the effects of the metabotropic glutamate receptor 1 (mGluR1) antagonist LY367385 on brain injury after transient (90 min) middle cerebral artery occlusion in the rat and sought to explore their mechanisms. The intravenous administration of LY367385 (10 mg/kg) reduced the infarct volume at 24 h after the start of reperfusion. As the Gq-coupled mGluR1 receptor is known to activate the PKC/Src family kinase cascade, we focused on changes in the activation and amount of these kinases. Transient focal ischemia increased the amount of activated tyrosine kinase Src and PKC in the post-synaptic density (PSD) at 4 h of reperfusion. The administration of LY367385 attenuated the increases in the amounts of PSD-associated PKCγ and Src after transient focal ischemia. We further investigated phosphorylation of the NMDA receptor, which is a major target of Src family kinases to modulate the function of the receptor. Transient focal ischemia increased the tyrosine phosphorylation of NMDA receptor subunits NR2A and NR2B. Tyrosine phosphorylation of NR2A, but not that of NR2B, in the PSD at 4 h of reperfusion was inhibited by LY367385. These results suggest that the mGluR1 after transient focal ischemia is involved in the activation of Src, which may be linked to the modification of properties of the NMDA receptor and the development of cerebral infarction.
doi_str_mv 10.1111/j.1471-4159.2008.05260.x
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We investigated the effects of the metabotropic glutamate receptor 1 (mGluR1) antagonist LY367385 on brain injury after transient (90 min) middle cerebral artery occlusion in the rat and sought to explore their mechanisms. The intravenous administration of LY367385 (10 mg/kg) reduced the infarct volume at 24 h after the start of reperfusion. As the Gq-coupled mGluR1 receptor is known to activate the PKC/Src family kinase cascade, we focused on changes in the activation and amount of these kinases. Transient focal ischemia increased the amount of activated tyrosine kinase Src and PKC in the post-synaptic density (PSD) at 4 h of reperfusion. The administration of LY367385 attenuated the increases in the amounts of PSD-associated PKCγ and Src after transient focal ischemia. We further investigated phosphorylation of the NMDA receptor, which is a major target of Src family kinases to modulate the function of the receptor. 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We investigated the effects of the metabotropic glutamate receptor 1 (mGluR1) antagonist LY367385 on brain injury after transient (90 min) middle cerebral artery occlusion in the rat and sought to explore their mechanisms. The intravenous administration of LY367385 (10 mg/kg) reduced the infarct volume at 24 h after the start of reperfusion. As the Gq-coupled mGluR1 receptor is known to activate the PKC/Src family kinase cascade, we focused on changes in the activation and amount of these kinases. Transient focal ischemia increased the amount of activated tyrosine kinase Src and PKC in the post-synaptic density (PSD) at 4 h of reperfusion. The administration of LY367385 attenuated the increases in the amounts of PSD-associated PKCγ and Src after transient focal ischemia. We further investigated phosphorylation of the NMDA receptor, which is a major target of Src family kinases to modulate the function of the receptor. 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Neuromudulation. Pathways and receptors</topic><topic>Cerebral Infarction - etiology</topic><topic>Cerebral Infarction - metabolism</topic><topic>Cerebral Infarction - prevention &amp; control</topic><topic>Excitatory Amino Acid Antagonists - pharmacology</topic><topic>Excitatory Amino Acid Antagonists - therapeutic use</topic><topic>Fundamental and applied biological sciences. 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We investigated the effects of the metabotropic glutamate receptor 1 (mGluR1) antagonist LY367385 on brain injury after transient (90 min) middle cerebral artery occlusion in the rat and sought to explore their mechanisms. The intravenous administration of LY367385 (10 mg/kg) reduced the infarct volume at 24 h after the start of reperfusion. As the Gq-coupled mGluR1 receptor is known to activate the PKC/Src family kinase cascade, we focused on changes in the activation and amount of these kinases. Transient focal ischemia increased the amount of activated tyrosine kinase Src and PKC in the post-synaptic density (PSD) at 4 h of reperfusion. The administration of LY367385 attenuated the increases in the amounts of PSD-associated PKCγ and Src after transient focal ischemia. We further investigated phosphorylation of the NMDA receptor, which is a major target of Src family kinases to modulate the function of the receptor. Transient focal ischemia increased the tyrosine phosphorylation of NMDA receptor subunits NR2A and NR2B. Tyrosine phosphorylation of NR2A, but not that of NR2B, in the PSD at 4 h of reperfusion was inhibited by LY367385. These results suggest that the mGluR1 after transient focal ischemia is involved in the activation of Src, which may be linked to the modification of properties of the NMDA receptor and the development of cerebral infarction.</abstract><cop>Oxford, UK</cop><pub>Oxford, UK : Blackwell Publishing Ltd</pub><pmid>18248625</pmid><doi>10.1111/j.1471-4159.2008.05260.x</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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subjects Animals
Benzoates - pharmacology
Biochemistry
Biological and medical sciences
Brain damage
Central nervous system
Central neurotransmission. Neuromudulation. Pathways and receptors
Cerebral Infarction - etiology
Cerebral Infarction - metabolism
Cerebral Infarction - prevention & control
Excitatory Amino Acid Antagonists - pharmacology
Excitatory Amino Acid Antagonists - therapeutic use
Fundamental and applied biological sciences. Psychology
Glycine - analogs & derivatives
Glycine - pharmacology
ischemia
Ischemic Attack, Transient - complications
Ischemic Attack, Transient - metabolism
Ischemic Attack, Transient - prevention & control
Kinases
Male
Medical sciences
metabotropic glutamate receptor
Neurology
NMDA receptor
Phosphorylation - drug effects
post-synaptic density
Rats
Rats, Sprague-Dawley
Receptors, Metabotropic Glutamate - antagonists & inhibitors
Receptors, Metabotropic Glutamate - metabolism
Receptors, N-Methyl-D-Aspartate - metabolism
Rodents
Tyrosine - metabolism
tyrosine phosphorylation
Vascular diseases and vascular malformations of the nervous system
Vertebrates: nervous system and sense organs
title mGluR1 antagonist decreases tyrosine phosphorylation of NMDA receptor and attenuates infarct size after transient focal cerebral ischemia
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