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• W1975262887 endingPage "701" @default.
• W1975262887 startingPage "691" @default.
• W1975262887 abstract "Phosphatidic acid (PA) is an obligate intermediate in the phosphatidylinositol (PI) cycle and may serve as a sensitive marker for this pathway of reactions. Previously, we have shown that acetylcholine (ACh) stimulates formation of labeled PA in whole rat corneas whose phospholipids were prelabeled with [14C]arachidonate. To determine which layer of the cornea exhibits the ACh effect, intact epithelium was isolated from the rest of the corneal tissue (designated stroma/endothelium) by incubating rat corneas with neutral protease and then stripping off the epithelium using forceps. The epithelium was ultrastructurally normal and avidly incorporated [14C]arachidonate into phospholipids; the stroma/endothelium had only trace incorporation. [14C]Arachidonyl-PA formation by the epithelium was significantly increased after a 37 second (+58%) and was maximal after a 5.0 minute (+188%) incubation in the presence of 1 mM ACh. The stimulation by ACh was blocked by atropine and scopolamine but not by d-tubocurarine. The epithelium also incorporated significant quantities of [3H]inositol into phosphatidylinositol (PI), phosphatidylinositol monophosphate (PIP), and phosphatidyl-inositol bisphosphate (PIP 2). When [3H]inositol-labeled epithelia were incubated for 5 minutes with 1 mM ACh, [3H]inositol monophosphate (IP) was increased 200%, [3H]inositol bisphosphate (IP2) was increased 225%, and [3H]inositol 2 trisphosphate (IP3) was increased 74%. These results suggest that muscarinic cholinergic receptors may be an important regulator of the PI cycle in corneal epithelium and thus may affect intracellular calcium mobilization and epithelial proliferation and regeneration." @default.
• W1975262887 created "2016-06-24" @default.
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• W1975262887 date "1987-01-01" @default.
• W1975262887 modified "2023-09-23" @default.
• W1975262887 title "Cholinergic stimulation of phosphatidylinositol hydrolysis by rat corneal epithelium in vitro" @default.
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• W1975262887 doi "https://doi.org/10.3109/02713688709034832" @default.
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