Role of extracellular calcium in anoxic injury of mammalian central white matter

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)4212-4216
Journal / PublicationProceedings of the National Academy of Sciences of the United States of America
Volume87
Issue number11
Publication statusPublished - 1 Jun 1990
Externally publishedYes

Abstract

White matter (WM) of the mammalian brain is susceptible to anoxic injury, but little is known about the pathophysiology of this process. We studied the mechanisms of anoxic injury in WM using the isolated rat optic nerve, a typical central nervous system WM tract. Optic nerve function, measured as the area under the compound action potential, rapidly failed when exposed to anoxia and recovered to 28.5% of control after a standard 60-min period of anoxia. Irreversible anoxic injury was critically dependent on the molar concentration of extracellular calcium ([Ca2+]o); maintaining the tissue in Ca2+-free solution throughout the anoxic period resulted in 100% compound action potential recovery. Increasing perfusion [Ca2+l during anoxia from zero to 4 mM resulted in progressively less recovery. As the introduction of the Ca2+-free solution was progressively delayed with respect to the onset of anoxia, a graded decrease in recovery of function was observed, suggesting that in WM the deleterious effects of Ca2+ accumulate slowly during anoxia. At the time of reoxygenation, an additional stepwise increase in injury was observed that was also Ca2+-dependent. Mammalian WM, which is relatively resistant to anoxic injury compared with gray matter, is damaged by anoxia in a manner that appears to depend on the gradual accumulation of Ca2+ in a cytoplasmic compartment.

Research Area(s)

  • anoxia, optic nerve, stroke, axon, myelin

Citation Format(s)

Role of extracellular calcium in anoxic injury of mammalian central white matter. / STYS, PETER K.; RANSOM, BRUCE R.; WAXMAN, STEPHEN G.; DAVIS, PETER K.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 87, No. 11, 01.06.1990, p. 4212-4216.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review