Mifepristone alters expression of endometrial steroid receptors and their cofactors in new users of medroxyprogesterone acetate.
OBJECTIVE: To evaluate the effect of mifepristone on the expression of endometrial steroid receptors and their co-factors in depot medroxyprogesterone acetate (DMPA) users. DESIGN: A prospective, randomized, placebo-controlled trial. SETTING: Reproductive research center. PATIENT(S): Fifty healthy women with regular menstrual cycle. INTERVENTION(S): One hundred fifty milligrams of DMPA were given every 3 months. Two pills (25 mg each) of placebo or mifepristone were administered every 14 days during the DMPA therapy. Four endometrial biopsy specimens were obtained from each patient. MAIN OUTCOME MEASURE(S): The expression of estrogen receptor subtypes alpha and beta (ERalpha and ERbeta), progesterone receptors A and B (PRAB and PRB), and androgen receptor messenger RNA and protein was detected by real-time polymerase chain reaction and immunohistochemistry, respectively. Steroid receptor coactivator 1 (SRC-1), silencing mediator for retinoid and thyroid-hormone receptors, and cell proliferation were evaluated by immunohistochemistry. RESULT(S): The expression of endometrial ERalpha, PRAB, PRB, and SRC-1 was increased significantly after 1 week of mifepristone, but the increase was no longer seen after 10 weeks. A positive correlation between endometrial ERalpha, PRAB, PRB, and SRC-1 production and proliferation was demonstrated. CONCLUSION(S): Short-term exposure of mifepristone in new starters of DMPA increases the expression of endometrial ERalpha, PRAB, PRB, and SRC-1 and promotes cell proliferation. Prolonged exposure to mifepristone does not alter the suppression of these receptors that are caused by DMPA and continues to result in endometrial atrophy.
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CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-Y GENE-N GENE-Y GENE-Y CHEMICAL GENE-Y GENE-N GENE-Y GENE-Y GENE-Y GENE-N GENE-Y GENE-Y GENE-N GENE-Y CHEMICAL GENE-Y GENE-N GENE-N GENE-Y GENE-N GENE-N GENE-Y GENE-Y GENE-N GENE-N CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
Steroid retinoid thyroid-hormone Mifepristone medroxyprogesterone acetate steroid ERalpha PRAB PRB SRC-1 mifepristone ERalpha PRAB PRB SRC-1 ERalpha PRAB PRB SRC-1 estrogen receptor subtypes alpha and beta ERalpha medroxyprogesterone acetate ERbeta progesterone receptors A and B PRAB PRB androgen receptor steroid receptors Steroid receptor coactivator 1 SRC-1 retinoid and thyroid-hormone receptors steroid receptors mifepristone mifepristone mifepristone estrogen progesterone androgen steroid