Summary
The mitogenic and differentiation-inducing activities of epidermal growth factor (EGF) in epithelial tissues have been well described. Since non-mitogenic effects of EGF, especially in mesenchymal tissues such as smooth muscle are not well-known (Nanney et al. 1984), we have examined EGF-binding and receptors in smooth muscle from many sites. Specific EGF binding sites were detected by incubating small pieces of tissue with 125I-EGF; immunoreactive EGF receptors were detected by immunohistochemistry. In-situ localization of 125I-EGF binding sites and immunoreactive EGF receptors of smooth muscle cells in intact mammalian tissues were identical using either 125I-EGF autoradiography or anti-EGF receptor antibody in an immunoperoxidase method. Cultured rat aortic smooth muscle also contained specific EGF receptors as detected by their biological response to EGF-binding and internalization of 125I-EGF, as well as EGF-stimulated phosphorylation of a 170K protein. The presence of EGF receptors in a well-differentiated smooth muscle cell indicates that EGF may play a physiological, but non-mitogenic role in mammalian tissues in vivo.
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Nanney, L.B., Stoscheck, C.M. & King, L.E. Characterization of binding and receptors for epidermal growth factor in smooth muscle. Cell Tissue Res. 254, 125–132 (1988). https://doi.org/10.1007/BF00220025
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DOI: https://doi.org/10.1007/BF00220025