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Endocrinology, Vol 137, 1735-1744, Copyright © 1996 by Endocrine Society

ARTICLES

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

DM Ignar-Trowbridge, M Pimentel, MG Parker, JA McLachlan and KS Korach
Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA.

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 ICI 164,384; conversely, the combination of TPA with either TGF alpha of IGF-I elicited a response only equal to the maximal TPA response. Thus, peptide growth factors elicit ER-dependent transcription independently of PFC; however, there may be a common mechanistic component, as saturation of response was observed. Finally, activation of ERE-dependent transcription in Chinese hamster ovary cells by IGF-I was observed in the presence of a mutant receptor that lacks estrogen-binding activity. The effect of both IGF-I and E2 were dependent on the ability of the ER to bind to DNA. IGF-I elicited only weak transcriptional activation in the presence of a deletion mutant that lacked the entire A/B domain; however, synergism between IGF-I and E2 was observed with this mutant. Therefore, ligand-independent activation of ER-dependent transcription by IGF-I is predominantly mediated through activation function I by a mechanism distinct from that of E2.


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