Effect of medroxyprogesterone acetate on sex hormone-binding globulin mRNA expression in the human endometrial cancer cell line Ishikawa.
To understand the rationale of high-dose medroxyprogesterone acetate (MPA) in the treatment of well-differentiated uterine endometrial cancers, the effect of MPA on intracellular sex hormone-binding globulin (SHBG) mRNA expression in well-differentiated uterine endometrial cancer cell line Ishikawa was determined by competitive reverse transcription-polymerase chain reaction-Southern blot analysis. Estradiol-17beta (E2, 10(-8) mol/l) did not alter SHBG mRNA expression, but the addition of 10(-10) mol/l MPA increased it, while a high concentration of MPA (10(-6) to 10(-5) mol/l) with or without E2 suppressed it. Furthermore. a high dose (10(-6) mol/l) of chlormadinone acetate or danazol with or without E2 significantly suppressed its expression, while MPA was the most effective among the hormones tested. The effect of MPA and the other steroid hormone analogs on SHBG expression was not mediated via the progesterone receptor. These findings suggest that intracellular SHBG suppression might partly contribute to the abolition of the intracellular estrogen-dominant milieu, and may be involved as one of the mechanisms of the antitumoral effects of high-dose MPA on the development and growth of some well-differentiated endometrial cancer cells.
Misao
R
R
Department of Obstetrics and Gynecology, Gifu University School of Medicine, Japan.
Nakanishi
Y
Y
Fujimoto
J
J
Tamaya
T
T
D018931:Antineoplastic Agents, Hormonal / Q000627:therapeutic use*; D002454:Cell Differentiation / Q000187:drug effects; D016889:Endometrial Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D005260:Female; D006801:Humans; D017258:Medroxyprogesterone Acetate / Q000627:therapeutic use*; D016133:Polymerase Chain Reaction / Q000379:methods; D012333:RNA, Messenger / Q000096:biosynthesis*; D012738:Sex Hormone-Binding Globulin / Q000235:genetics*; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured
D018931:Antineoplastic Agents, Hormonal; D012333:RNA, Messenger; D012738:Sex Hormone-Binding Globulin; D017258:Medroxyprogesterone Acetate