Marini M, Musiani D. Micromolar zinc affects endonucleolytic activity in hydrogen peroxide-mediated apoptosis.
Exp Cell Res 1998;
239:393-8. [PMID:
9521857 DOI:
10.1006/excr.1997.3909]
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Abstract
When damaged by hydrogen peroxide, peripheral blood lymphocytes undergo cell death by apoptosis in the absence of internucleosomal DNA cleavage, while, in the same cells, other apoptosis-inducing treatments bring DNA cleavage to completion. However, the formation of internucleosomal DNA fragments is readily obtained if cells are pretreated with a divalent metal chelator, TPEN, at micromolar concentrations. Since the coadministration of equimolar zinc concentrations abrogates the formation of the ladder, a zinc-inhibitable endonucleolytic activity is accounted for the effect. Most notably, subtraction of zinc ions does not increase the percentage of cells undergoing apoptosis, but rather results in a rescue from death.
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