Effect of New Progestins of the D′-Pentarane Series on Expression of Estrogen ERβ and Vitamin D Receptor Genes in Immunocompetent Blood Cells
摘要
The effect of new progestins of the D′-pentarane series containing an additional three- or six-membered D′ ring in the 16α,17β-positions of the steroid skeleton and oxime groups in the 3- or 6-position on the expression level (amount of mRNA) of genes of progesterone- (mPR, PGRmC1, PR-A, PR-B) and estrogen-steroid (mER, ERα, ERβ) and vitamin D receptors in immunocompetent blood cells of healthy patients was studied. Only pentarane 6(E)-hydroxyimino-16α,17β-cyclohexanopregn-4-en-3β-ol-20-one (K-1044) of the four steroids studied with high progesterone receptor binding did not reduce the level of estrogen receptor ER mRNA, a predictor of the effectiveness of menopausal hormone therapy. The remaining three compounds exhibited pronounced inhibition of ER mRNA expression by 3.5 and 9 times lower than the control values for 6(E)-methoxyimino-16α,17β-cyclohexanopregn-4-en-3-ol-20-one (K-1046) and 16α,17β-cyclopropano-pregn-4-ene-3,20-dione (K-338), respectively, and practically to zero for 3(E)-hydroxyimino-16α,17β-cyclo-hexanopregn-4-ene-3,20-dione (K-993). Also, these four pentaranes not only did not reduce but also increased the expression of vitamin D receptor (VDR) mRNA in peripheral blood mononuclear cells. The effect of pentarane K-1044 was the most significant.