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© The Rockefeller University Press, 0021-9525/1999//699 $5.00
The Journal of Cell Biology, Volume 145, Number 4, , 1999 699-711


Regular Articles

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



Nicole R. Murray*,{ddagger}, Laurie A. Davidson||, Robert S. Chapkin||, W. Clay Gustafson*,{ddagger}, Diane G. Schattenberg*, and Alan P. Fields*,{ddagger},§

* Sealy Center for Oncology and Hematology, {ddagger} 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

Protein kinase C βII (PKC βII) has been implicated in proliferation of the intestinal epithelium. To investigate PKC βII function in vivo, we generated transgenic mice that overexpress PKC βII in the intestinal epithelium. Transgenic PKC βII 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 βII mice exhibit elevated colonic β-catenin levels and decreased glycogen synthase kinase 3β activity, indicating that PKC βII stimulates the Wnt/adenomatous polyposis coli (APC)/β-catenin proliferative signaling pathway in vivo. These data demonstrate a direct role for PKC βII in colonic epithelial cell proliferation and colon carcinogenesis, possibly through activation of the APC/β-catenin signaling pathway.

Key Words: protein kinase C • colon carcinogenesis • signal transduction • proliferation • transgenic mice



Abbreviations used in this paper: ACF, aberrant crypt foci; AOM, azoxymethane; APC, adenomatous polyposis coli; DAG, diacylglycerol; DBA, dolichos biflorus agglutinin; FABP, fatty acid binding protein; GSK-3β, glycogen synthase kinase 3β; PAS, periodic acid Schiff; PKC, protein kinase C; PKC βII, protein kinase C βII isozyme; PNA, peanut agglutinin; RT-PCR, reverse transcriptase PCR; TUNEL, TdT-mediated dUTP-biotin nick end labeling; UEAI, Ulex europaeus-I.



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