Tumor necrosis factor-alpha suppresses the expression of steroid receptor coactivator-1 and -2: a possible mechanism contributing to changes in steroid hormone responsiveness

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Rita S LeiteJerome F Strauss

Abstract

Inflammation is associated in some tissues with diminished responsiveness to steroid hormone action. We hypothesized that proinflammatory cytokines alter steroid hormone sensitivity, in part, by reducing levels of key nuclear receptor coactivators. Treatment of cultured human uterine smooth muscle cells (UtSMC) with TNF-alpha significantly reduced mRNA for the coactivators, SRC-1 (42%, P<0.01) and 2 (47%, P<0.03), and diminished the respective protein levels, but did not significantly alter the mRNAs encoding SRC-3, CBP and the corepressors, NCoR and SMRT; or progesterone receptor protein levels. To assess TNF-alpha effects on steroid hormone-mediated transcriptional activity, UtSMC were transfected with progesterone receptor B (PR-B) and a model PRE2-luciferase reporter construct. Transfected UtSMC were treated with progesterone alone or in the presence of TNF-alpha, and assayed for luciferase activity. TNF-alpha (10 ng/ml) diminished progesterone-stimulated PR-B-mediated transactivation by approximately 60% (P<0.02). The TNF-alpha-dependent decrease in PRE-luciferase activity was fully prevented by cotransfection with SRC-2, and partially prevented with exogenous SRC-1. In conclusion, TNF-alpha impairs progesterone-stimulated...Continue Reading

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