Ischemia induces short- and long-term remodeling of synaptic activity in the hippocampus.
One of the most vulnerable areas to ischemia or hypoglycemia is CA1 hippocampal region due to pyramidal neurons death. Glutamate receptors are involved together with protein-kinase C and nitric oxide synthase. Long-term potentiation (LTP) is generated in anoxic or hypoglycemic conditions via activation of NMDA while inhibition of these receptors attenuates this response. Protein-kinase C and nitric oxide synthase are involved in anoxic LTP mechanism. Postischemic neurons are hyperexcitable in CA3 area while CA1 pyramidal neurons degenerate and disappear. Changes of glutamate receptors triggered by ischemia and hypoglycemia are discussed in this review.
Crepel
Valérie
V
INMED, INSERM U.29 & Université de La Méditerranée, Parc scientifique de Luminy, Marseille, France. crepel@inmed.univ-mrs.fr
Epsztein
J
J
Ben-Ari
Y
Y
D000818:Animals; D002545:Brain Ischemia / Q000503:physiopathology*; D006624:Hippocampus / Q000098:blood supply* / Q000503:physiopathology*; D006801:Humans; D019001:Nitric Oxide Synthase / Q000502:physiology; D052248:Nitric Oxide Synthase Type I; D011493:Protein Kinase C / Q000502:physiology; D018091:Receptors, AMPA / Q000502:physiology; D016194:Receptors, N-Methyl-D-Aspartate / Q000502:physiology; D012640:Seizures / Q000503:physiopathology; D013569:Synapses / Q000502:physiology
D018091:Receptors, AMPA; D016194:Receptors, N-Methyl-D-Aspartate; C496320:NOS1 protein, human; D019001:Nitric Oxide Synthase; D052248:Nitric Oxide Synthase Type I; D011493:Protein Kinase C