Peptide growth factor cross-talk with the estrogen receptor requires the A/B domain and occurs independently of protein kinase C or estradiol

Endocrinology
D M Ignar-TrowbridgeK S Korach

Abstract

Modulation of steroid receptor-dependent transcription by extra- cellular ligands represents a novel mechanism of steroid receptor regulation. We have assessed the effects of epidermal growth factor (EGF), transforming growth factor-alpha (TGF alpha), and insulin-like growth factor I (IGF-I) on transcription from consensus estrogen response elements (ERE) in estrogen receptor (ER)-positive BG-1 human ovarian adenocarcinoma calls. EGF, TGF alpha, IGF-I, and estradiol (E2) enhanced transcription in a dose-dependent manner using either a strong or a minimal promoter, and ICI 164,384, a specific ER antagonist, inhibited these responses. Combinations of E2 with TGF alpha or IGF-I induced synergistic activation of transcription from an ERE, whereas as additive response was observed with combinations of IGF-I and TGF alpha of EGF. Tetradecanoyl 12-phorbol 13-acetate (TPA), a protein kinase C (PKC) activator, stimulated ERE-mediated transcription, and this effect was inhibited by ICI 164,384. Bisindolylmaleimide, a relatively specific inhibitor of PKC, completely antagonized TPA-induced transcription, but did not affect the response to TGF alpha, IGF-I, or E2. The combination of TPA with E2 in transcriptional synergism was inhibited by...Continue Reading

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