Abstract
The signaling messengers for the regulation of intracellular calcium-dependent functions involve a phospholipid-sensitive protein kinase (protein kinase C) modulated by diacylglycerol, which is a product of phosphoinositide degradation. We found that protein kinase C activity is two times higher in the epithelium than in the stroma-endothelial layers of the rabbit cornea. 12-0-tetradecanoylphorbol-13-acetate (TPA) and phosphatidylserine stimulate protein kinase C at low Ca2+ concentrations. The TPA-phosphatidylserine stimulated activity of corneal epithelium was recovered in the soluble fraction; in the membrane-bound fraction, a very active phosphatidylinositol kinase accounted for half the basal phosphorylation of the corneal epithelium.
Published Version
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