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. 1996 Oct 15;93(21):12002–12007. doi: 10.1073/pnas.93.21.12002

Estradiol stimulates tyrosine phosphorylation of the insulin-like growth factor-1 receptor and insulin receptor substrate-1 in the uterus.

R G Richards 1, R P DiAugustine 1, P Petrusz 1, G C Clark 1, J Sebastian 1
PMCID: PMC38173  PMID: 8876252

Abstract

The signaling pathways associated with estrogen-induced proliferation of epithelial cells in the reproductive tract have not been defined. To identify receptor tyrosine kinases that are activated in vivo by 17 beta-estradiol (E2), uteri from ovariectomized mice were examined for enhanced tyrosine phosphorylation of various receptors and a receptor substrate following treatment with this hormone. Within 4 hr after hormone exposure, extracts showed increased phosphotyrosine (P-Tyr) immunoreactivity at several bands, including 170- and 180-kDa; these bands were still apparent at 24 hr after E2. Analysis of immunoprecipitates from uterine extracts revealed that E2 enhanced tyrosine phosphorylation of the insulin-like growth factor-1 receptor (IGF-1R) and insulin receptor substrate-1 (IRS-1) by 6 hr. Comparison of supernatants from IRS-1 and control rabbit IgG immunoprecipitates indicated that the 170-kDa P-Tyr band in extracts was equivalent to IRS-1. The receptors for epidermal growth factor, platelet-derived growth factor, and basic fibroblast growth factor did not exhibit an E2-induced increase in P-Tyr content. The nonestrogenic steroid hormones examined did not stimulate the P-Tyr content of IGF-1R or IRS-1. Immunolocalization of P-Tyr and IRS-1 revealed strong reactivity in the epithelial layer of the uterus from E2-treated mice, suggesting that the majority of P-Tyr bands observed in immunoblots originate in the epithelium. Since hormonal activation of IRS-1 is epithelial, estrogen-specific, and initiated before maximal DNA synthesis occurs following treatment with hormone, this protein, as part of the IGF-1R pathway, may be important in mediating estrogen-stimulated proliferation in the uterus.

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