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-Growth Factor Cross-Talk Mechanism
Receptor Biology Section (S.C.H., B.D., K.S.K.), Laboratory of Reproductive and Developmental Toxicology, and Microarray Group (J.C., S.G.), National Institute of Environmental Health Sciences (NIEHS), Research Triangle Park, North Carolina 27709
Address all correspondence and requests for reprints to: Sylvia C. Hewitt, NIEHS, PO Box 12233, Research Triangle Park, North Carolina 27709. E-mail: curtiss{at}niehs.nih.gov.
Cross-talk between growth factor receptors and the estrogen receptor (ER) has been proposed as a signaling mechanism in estrogen target tissues, with ER
as a direct target of growth factor receptor-activated signals, leading to regulation of estrogen target genes and estrogen-like biological responses to growth factors. We evaluated whether global genomic changes in the mouse uterus in response to epidermal growth factor or IGF-I mimic those of estradiol (E2), reflecting the cross-talk mechanism. Overlapping responses to growth factors and E2 were expected in the wild type (WT) whereas no response was expected in mice lacking ER (ER knockout). Surprisingly, although most of the E2 response in the WT also occurred after growth factor treatment, some genes were induced only by E2. Second, although E2 did not induce gene changes in the ER knockout, the growth factor response was almost indistinguishable from that of the WT. Differences in response of some genes to IGF-I or epidermal growth factor indicated selective regulation mechanisms, such as phosphatidylinositol 3-kinase or MAPK-dependent responses. The robust ER-independent genomic response to growth factor observed here is surprising considering that the biological growth response is ER dependent. We propose two mechanisms as alternatives to the cross-talk mechanism for uterine gene regulation. First, E2 increases uterine growth factors, which activate downstream signaling cascades, resulting in gene regulation. Second, growth factors and estrogen regulate similar genes. Our results suggest that the estrogen response in the uterus involves E2-specific ER-mediated responses as well as responses resulting from convergence of growth factor and ER-initiated activities.
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