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Deoxycholate (DOC), chenodeoxycholate, 12-O-tetradecanoyl phorbol-13-acetate (TPA), or 1-oleoyl-2-acetyl-glycerol (OAG) activated colonic epithelial protein kinase C as reflected by translocation from the soluble to the particulate cell fraction. Activation of protein kinase C was correlated with stimulation of enhanced proliferative activity of colonic mucosa and reactive oxygen production. TPA and OAG, but not DOC, directly activated soluble protein kinase C in vitro. However, DOC rapidly increased labeled inositol phosphate and diacylglycerol accumulation in colonic epithelial cells. Retinoic acid inhibited protein kinase C activity and suppressed DOC-, TPA-, and OAG-induced increases in reactive oxygen production. The results support a role for protein kinase C in the stimulation of colonic epithelial proliferative activity and reactive oxygen production induced by bile acids, TPA and OAG. In contrast to TPA and OAG, which activate protein kinase C directly, bile acids appear to activate protein kinase C indirectly by increasing the diacylglycerol content of colonic epithelium.

Role of activation of protein kinase C in the stimulation of colonic epithelial proliferation and reactive oxygen formation by bile acids.