We studied the ability of phorbol 12-myristate 13-acetat to prevent erythroid differentiation and apoptosis in erythroleukemic K562 cells induced by cytidine, thymidine, and guanosine. The exposure of cancer cells to combinations of phorbol 12-myrsitate 13-acetate (100 nM) nucleosides for two days led to a loss of hemoglobin production (marker of erythroid differentiation) in cells and increased expression of monocyte-macrophage lineage associated surface antigen CD14. The treatment of K562 cells with nucleosides only was accompanied by the activation of caspase-3 and caspase-9, rather than caspase-6, increased fluorescence of ethidium bromide and DAPI upon binding to DNA, and apoptosis. Intracellular activation of caspase-6, inhibition of caspase-9, a markedly decreased activity of caspase-3 and of fluorescence of DNA-binding dyes, and inhibition of apoptosis were observed when the cells were treated with phorbol 12-myeristet 13-acetate combined with nucleosides.
Russian Journal of Developmental Biology – Springer Journals
Published: Feb 24, 2005
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