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Journal of Neuroscience, Vol 11, 2545-2551, Copyright © 1991 by Society for Neuroscience
Intracellular calcium concentrations during "chemical hypoxia" and excitotoxic neuronal injury
JM Dubinsky and SM Rothman
Departments of Anatomy, Washington University School of Medicine, St Louis, Missouri 63110.
Because hypoxic/ischemic neurodegeneration appears to be in part linked to
glutamate neurotoxicity, we measured intracellular calcium (Ca2+i) levels
in cultured hippocampal neurons during exposure to toxic doses of glutamate
(GLU) and to an anoxic environment simulated by sodium cyanide (NaCN).
Changes in Ca2+i produced by cyanide greatly exceeded those induced by GLU.
The NaCN response was mimicked when oxidative metabolism was also disrupted
by sodium azide, oligomycin, or dinitrophenol. Noncompetitive NMDA receptor
antagonists and enzymatic GLU degradation abolished the GLU-induced Ca2+i
increases and attenuated those produced by NaCN. Only NaCN-induced
increases were blocked when dantrolene and ruthenium red were applied to
prevent release from intracellular pools. All responses were reduced
proportionally in the absence of added external calcium. These results
suggest that extracellular GLU accumulation and subsequent activation of
GLU receptors were involved in the NaCN response. During such metabolic
compromise, however, GLU-induced elevations of Ca2+i were enormously
amplified. In parallel toxicity studies, NaCN was not neurotoxic despite
the large elevations in Ca2+i, indicating that a general elevation in
cytoplasmic calcium does not necessarily predict neurodegeneration.
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