Abstract
The cell death induced by hydroxyl radicals generated by Cu-phenanthroline and peroxynitrite generated by 3-morpholinosydnonimine hydrochloride (SIN-1) in rat primary cortical neuronal cultures was compared with the apoptotic death induced by staurosporine and the necrotic death induced by glutamate. Both SIN-1 and Cu-phenanthroline were capable of generating internucleosomal cleavage of DNA—a hallmark of apoptosis. Other characteristics of this cell death, such as nuclear morphology by light microscopy; DNA breaks by single-cell gel electrophoresis; the effects of the apoptotic inhibitors cycloheximide, aurintricarboxylic acid, and tosyl-l-lysine chloromethyl ketone; the measurement of caspase activity; and the effects of antioxidants, were then analyzed. The conclusion from these hallmarks of apoptosis is that the cell death induced by these reactive oxygen species is not apoptosis.
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