Abstract
Isolated nuclei from mammalian cells contain a Ca 2+-dependent endonuclease [1]. The produced DNA fragmentation is a necessary step in the sequence of events resulting in apoptosis [2]. We report here that zinc inhibits the DNA fragmentation in dependence of the free Ca 2+ concentrations, suggesting that a balance between zinc and calcium might regulate the Ca 2+-dependent endonuclease. Incubation of nuclei with different free calcium concentrations combined with cadmium shows a stronger inhibition of the DNA fragmentation than zinc. Cadmium inhibits the endonuclease in a calcium-independent way. Surprisingly cadmium alone is able to stimulate the endonuclease, thus to replace Ca 2+.
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