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• W2009010144 abstract "Hydrolysis of exogenously added, [3H]inositol-labeled, phosphatidylinositol 4,5-bisphosphate (PIP2) by rat parotid membranes was increased, dose-dependently, by the muscarinic cholinergic agonist carbamylcholine (carbachol) in the presence of guanosine 5'-O-thiotriphosphate (GTP gamma S). The stimulation was inhibited by atropine and guanosine 5'-O-thiodiphosphate (GDP beta S). GTP gamma S alone stimulated PIP2 hydrolysis, with half-maximal activation at 0.1 microM. This was inhibited by GDP beta S but not by atropine. Agonist stimulation of PIP2 hydrolysis was dependent on the presence of lipids (phosphatidylserine:phosphatidylethanolamine:PIP2 = 1:1:1). When PIP2 was added as micelles with detergent (sodium deoxycholate) only, basal hydrolysis was elevated, thus decreasing the relative stimulation by GTP gamma S and carbachol. The water-soluble hydrolysis products formed under either condition were 1,4,5-inositol trisphosphate, 1,4-inositol bisphosphate, and cyclic inositol trisphosphate. Hydrolysis of exogenous phosphatidylinositol (PI) was also stimulated by carbachol in the presence of GTP gamma S but the extent of PI hydrolysis was 44-fold lower than PIP2 hydrolysis. When [Ca2+] in the medium was increased from 100 nM to 1 microM, basal hydrolysis of both PI and PIP2 increased (9.3- and 19.2-fold, respectively). However, levels of basal and stimulated PIP2 hydrolysis were higher (37.9- and 29.6-fold, respectively) than those of PI hydrolysis. Antibodies (both polyclonal and monoclonal) raised against phospholipase C (PLC beta 1) from bovine brain did not react with any component in either rat parotid membranes or cytosol, although a reactivity was detected in rat brain membranes. A monoclonal antibody against bovine brain PLC gamma 1 detected a approximately 150-kDa protein only in the parotid cytosol, while antisera against bovine brain PLC delta 1 enzyme showed no reactivity with parotid membranes or cytosol. Together, these observations suggest that while there appears to be a protein similar to bovine brain PLC gamma 1 in parotid gland cytosol, the PLC which mediates PIP2 hydrolysis in rat parotid membranes and can be regulated by the muscarinic receptor via a G-protein is distinct from the well-characterized PLC enzymes gamma 1, delta 1, and beta 1." @default.
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• W2009010144 title "Characterization of polyphosphoinositide-specific phospholipase C in rat parotid gland membranes" @default.
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• W2009010144 doi "https://doi.org/10.1016/0003-9861(92)90686-q" @default.
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