A novel selective progesterone receptor modulator asoprisnil (J867) inhibits proliferation and induces apoptosis in cultured human uterine leiomyoma cells in the absence of comparable effects on myometrial cells

The Journal of Clinical Endocrinology and Metabolism
Wei ChenTakeshi Maruo


Asoprisnil, a selective progesterone (P4) receptor (PR) modulator (SPRM) with mixed P4 agonist/antagonist activities, reduces uterine leiomyoma volume in a dose-dependent manner in the presence of follicular phase estrogen concentrations. The evidence from clinical studies suggests that asoprisnil may directly target the uterine leiomyomata. The present study evaluated the effects of asoprisnil on cell proliferation, the expression of apoptosis-related proteins, and apoptosis in cultured human uterine leiomyoma cells and matched normal myometrial cells. PR-A and PR-B expression in the two types of cells was comparatively evaluated. Cell proliferation, proliferating cell nuclear antigen (PCNA)-positive rate, and TUNEL-positive rate were assessed by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium assay, immunocytochemistry, and terminal deoxynucleotidyl transferase-mediated 2'-deoxyuridine 5'-triphosphate nick end labeling (TUNEL) assay, respectively. The expression of apoptosis-related proteins and PR was assessed by Western blot analysis. Compared with untreated cultures, asoprisnil decreased the number of viable cultured cells, the PCNA-positive rate, and PCNA protein expression in cult...Continue Reading


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