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J. Cell Biol., Volume 145, Number 4, May 17, 1999 699-711

Overexpression of Protein Kinase C beta II Induces Colonic Hyperproliferation and Increased Sensitivity to Colon Carcinogenesis

Nicole R. Murray,*Dagger Laurie A. Davidson,parallel Robert S. Chapkin,parallel W. Clay Gustafson,*Dagger Diane G. Schattenberg,* and Alan P. Fields*Dagger §

* Sealy Center for Oncology and Hematology, Dagger  Department of Human Biological Chemistry & Genetics, and § Department of Pharmacology, University of Texas Medical Branch, Galveston, Texas 77555-1048; and parallel  Faculty of Nutrition, Molecular and Cell Biology Section, Texas A&M University, College Station, Texas 77843-2471

Protein kinase C beta II (PKC beta II) has been implicated in proliferation of the intestinal epithelium. To investigate PKC beta II function in vivo, we generated transgenic mice that overexpress PKC beta II in the intestinal epithelium. Transgenic PKC beta II mice exhibit hyperproliferation of the colonic epithelium and an increased susceptibility to azoxymethane-induced aberrant crypt foci, preneoplastic lesions in the colon. Furthermore, transgenic PKC beta II mice exhibit elevated colonic beta -catenin levels and decreased glycogen synthase kinase 3beta activity, indicating that PKC beta II stimulates the Wnt/adenomatous polyposis coli (APC)/beta -catenin proliferative signaling pathway in vivo. These data demonstrate a direct role for PKC beta II in colonic epithelial cell proliferation and colon carcinogenesis, possibly through activation of the APC/beta -catenin signaling pathway.

Key words: protein kinase C;  colon carcinogenesis;  signal transduction;  proliferation;  transgenic mice


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