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Department of Cell Biology and Anatomy, Oregon Health Sciences University, Portland, Oregon 97201 [P. W. C., W. W. K., G. D. S.]; Department of Dermatology, Mayo Clinic/Foundation, Rochester, Minnesota 55905 [M. R. P.]; and Departments of Cell Biology and Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee 37232 [R. J. C., R. G-D.]
Amphiregulin (AR) is a heparin-regulated, epidermal growth factor-like growth factor capable of stimulating the proliferation of non-tumorigenic cells while inhibiting cell proliferation in some human tumor cell lines in vitro. In the present study, we have investigated AR mRNA expression in normal, hyperproliferative, and neoplastic human epithelium. Our results demonstrate that, compared with the adjacent uninvolved epithelium, AR mRNA expression is markedly elevated in epidermal biopsies derived from three human psoriatic lesions as well as in biopsies derived from five human colon carcinomas and three human stomach carcinomas. Moreover, analysis of a colon carcinoma by in situ hybridization revealed that AR mRNA is localized to the epithelium.
1 This work was supported by NIH Grants CA42409 (G. D. S.), CA 46413 (R. J. C.), and AR39547 (M. R. P.); a grant from Clonetics Corporation (G. D. S.); a grant from the Veterans Administration (R. J. C.); and a grant from the Mayo Foundation (M. R. P.).
2 To whom requests for reprints should be addressed, at OHSU-L215, 3181 S.W. Sam Jackson Park Road, Portland, OR 97201.
Received 1/29/92. Accepted 4/16/92.
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