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J. Cell Biol.,
Volume 145, Number 4, May 17, 1999 699-711
II Induces Colonic
Hyperproliferation and Increased Sensitivity to Colon Carcinogenesis




§
* Sealy Center for Oncology and Hematology, Protein kinase C
Department of Human Biological Chemistry & Genetics, and § Department of
Pharmacology, University of Texas Medical Branch, Galveston, Texas 77555-1048; and
Faculty of Nutrition, Molecular and Cell
Biology Section, Texas A&M University, College Station, Texas 77843-2471
II (PKC
II) has been implicated in proliferation of the intestinal epithelium. To
investigate PKC
II function in vivo, we generated
transgenic mice that overexpress PKC
II in the intestinal epithelium. Transgenic PKC
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
II mice exhibit elevated colonic
-catenin levels and decreased glycogen synthase kinase 3
activity, indicating that PKC
II stimulates the
Wnt/adenomatous polyposis coli (APC)/
-catenin proliferative signaling pathway in vivo. These data demonstrate a direct role for PKC
II in colonic epithelial cell
proliferation and colon carcinogenesis, possibly through
activation of the APC/
-catenin signaling pathway.
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