A novel selective progesterone receptor modulator asoprisnil activates tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-mediated signaling pathway in cultured human uterine leiomyoma cells in the absence of comparable effects on myometrial cells

The Journal of Clinical Endocrinology and Metabolism
Hiroko SasakiT Maruo

Abstract

We previously demonstrated that asoprisnil, a selective progesterone receptor modulator, induces apoptosis of cultured uterine leiomyoma cells. This study was conducted to evaluate whether asoprisnil activates TNF-related apoptosis-inducing ligand (TRAIL)-mediated apoptotic pathway in cultured uterine leiomyoma and matching myometrial cells. After subculture in phenol red-free DMEM supplemented with 10% fetal bovine serum for 120 h, cultured cells were stepped down to serum-free conditions for 24 h in the absence or presence of graded concentrations of asoprisnil. The levels of TRAIL signaling molecules and cellular inhibitors of apoptosis protein were assessed by Western blot analysis. TRAIL contents in untreated cultured leiomyoma cells were significantly (P < 0.01) lower compared with those in untreated cultured myometrial cells. There was no difference in death receptor (DR)4 and DR5 contents between the two types of cells. Asoprisnil treatment significantly (P < 0.05) increased TRAIL, DR4, and DR5 contents in cultured leiomyoma cells in a dose-dependent manner with a cleavage of caspase-8, -7, and -3, and decreased X-linked chromosome-linked inhibitor of apoptosis protein contents. In cultured myometrial cells, however, as...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis