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Modulatory effects of phytoestrogens on the expression of Fas ligand and the release of cytochrome C in normal and cancerous endometrial cells. | LitMetric

AI Article Synopsis

Article Abstract

Cytochrome c (CytC) released from mitochondria induces apoptosis in both normal and tumor cells. Expression of Fas ligand (FasL) helps maintain tumor cell survival by inducing apoptosis of Fas-bearing anti-tumor immune cells. A risk of endometrial cancer has been reported to associate with phytoestrogen consumption. Therefore the effects of phytoestrogens, genistein and daidzein, on FasL and CytC protein expression were examined in primary cultured porcine endometrial cells (PE) and human cancerous endometrial cells (RL95-2) by Western blot analysis. Both cells were cultured in standard medium (SM) and switched to estrogen-deprived medium (SF) with or without 17beta-estradiol (E, 1 nM), genistein (10 microM) or daidzein (10 microM) for 48 h. FasL (25 kDa) which was found only in RL95-2 cells was upregulated in SF compared to SM. Treatment of RL95-2 cells with E, daidzein or genistein significantly increased the FasL expression by 7-10 folds. In the present study, low level of CytC was detected in both cells cultured in SM but markedly increased in SF by 1.5-2 folds. The SF-induced increase in CytC level was reversed by genistein or daidzein while E suppressed CytC in PE cells, but not in RL95-2 cells. The findings suggest that genistein and daidzein appear to act as a survival factor by inhibiting intracellular apoptogenic initiator in both normal and cancer endometrial cells. In addition, estrogen and phytoestrogens inducing the death signal FasL expressed by cancerous endometrial cells may cause the tumor progression. Thus, consuming phytoestrogen as a supplement should be awareness in patient with endometrial cancer.

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