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Science 20 April 1990:
Vol. 248. no. 4953, pp. 364 - 367
DOI: 10.1126/science.2326646
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Articles

Science, Vol 248, Issue 4953, 364-367
Copyright © 1990 by American Association for the Advancement of Science

articles

HIV-1 coat protein neurotoxicity prevented by calcium channel antagonists

EB Dreyer, PK Kaiser, JT Offermann, and SA Lipton

Department of Neurology, Children's Hospital, Boston, MA.

Coat protein gp120 from the human immunodeficiency virus type-1 (HIV-1) increased intracellular free calcium and injured rodent retinal ganglion cells and hippocampal neurons in culture. Highly purified recombinant gp120 envelope protein produced these effects in a dose-dependent fashion at picomolar concentrations. Immunoprecipitation with antibody to gp120, but not with control immunoglobulin-containing serum, depleted solutions of the viral envelope protein and also prevented both the rise in intracellular calcium and neuronal toxicity. The gp120-induced increase in intracellular calcium was abrogated by transiently lowering extracellular calcium or by adding the dihydropyridine calcium channel antagonist nimodipine (100 nM). Calcium channel antagonists also prevented gp120-induced neuronal injury. In addition, intracellular stores appeared to contribute substantially to the increase in calcium elicited by gp120. Since increases in intracellular calcium have been associated with neurotoxicity, it is possible that an injurious effect of gp120 on neurons might be related to this mechanism and that treatment with calcium channel antagonists may prove useful in mitigating HIV-1-related neuronal injury.


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