Glutathione depletion restores the susceptibility of cisplatin-resistant chronic myelogenous leukemia cell lines to Natural Killer cell-mediated cell death via necrosis rather than apoptosis - PubMed (original) (raw)
Glutathione depletion restores the susceptibility of cisplatin-resistant chronic myelogenous leukemia cell lines to Natural Killer cell-mediated cell death via necrosis rather than apoptosis
G V Dedoussis et al. Eur J Cell Biol. 2001 Sep.
Abstract
We investigated the effect of intracellular glutathione (GSH) levels on Natural Killer-mediated apoptosis in cisplatin-resistant K562 cells. K562/B6 and K562/C9 are cisplatin-resistant K562 cells less susceptible to lysis by natural killer cells. Cisplatin-resistant K562 cells did not present the apoptotic pattern of DNA fragmentation as it was observed for their maternal counterparts. K562/B6 and K562/C9 cell lines produce 1.6- and 1.9-times more GSH than K562 cells. Treatment of both cell lines with D,L-buthionine-(S,R)-sulfoximine (BSO, a gamma-glutamyl cysteine synthetase inhibitor) decreased GSH levels and augmented cell death induced by NK cells via a necrotic rather than an apoptotic process. Proliferating cell nuclear antigen (PCNA) expression was elevated in cisplatin-resistant K562 subclones, and the reduction of GSH levels after treatment with BSO decreased the expression of PCNA. These results suggest that the GSH level affects the NK cell-mediated cell death of cisplatin-resistant K562 cells by inducing necrosis rather than apoptosis.
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