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The novel phospholipase C activator, m-3M3FBS, induces apoptosis in tumor cells through caspase activation, down-regulation of XIAP and intracellular calcium signaling

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Abstract

We investigated the effect of the novel phospholipase C activator, m-3M3FBS, on the apoptosis of human renal Caki cancer cells. Treatment with m-3M3FBS induced apoptosis of Caki cells, which was accompanied by accumulation of sub-G1 phase and DNA fragmentation. We found that induction of apoptosis is a common response of several cancer cell types to m-3M3FBS treatment. Overexpression of Bcl-2 and c-FLIPs fails to block m-3M3FBS-induced apoptosis. However, ectopic expression of XIAP partly inhibits m-3M3FBS-induced apoptosis in Caki cells. m-3M3FBS-induced apoptosis appeared to involve the XIAP down-regulation and caspase activation. m-3M3FBS also induced the expression of a potential proapoptotic gene, C/EBP homologous protein (CHOP), however, suppression of CHOP expression by small interfering RNA did not abrogate the m-3M3FBS-induced apoptosis. In addition, inhibition of phospholipase C (PLC) or chelation of intracellular calcium prevented m-3M3FBS-induced apoptosis in Caki cells, suggesting that the involvement of PLC pathway and intracellular calcium signaling on the apoptosis in m-3M3FBS-treated Caki cells. Collectively, our present results suggest that m-3M3FBS-induced apoptosis in Caki cells may result from the activation of caspase, down-regulation of XIAP and intracellular Ca2+ release pathway and that m-3M3FBS treatment might overcome the anti-apoptotic effect of Bcl-2 or c-FLIPs in cancer cells.

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Acknowledgements

This work was supported by grants from the MRC program of the Korea Science & Engineering Foundation (KOSEF) (R13-2002-028-01002-0)

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Correspondence to Taeg Kyu Kwon.

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Eun Mi Jung and Tae-Jin Lee contributed equally to this work.

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Jung, E.M., Lee, TJ., Park, JW. et al. The novel phospholipase C activator, m-3M3FBS, induces apoptosis in tumor cells through caspase activation, down-regulation of XIAP and intracellular calcium signaling. Apoptosis 13, 133–145 (2008). https://doi.org/10.1007/s10495-007-0159-4

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