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• W7299164 abstract "Thyrotropin-releasing hormone (TRH) affects hormone secretion and synthesis in GH4C1 cells, a clonal strain of rat pituitary cells. Recent evidence suggests that the intracellular mediators, inositol 1,4,5-trisphosphate and 1,2-diacylglycerol, which are generated as a result of TRH-induced hydrolysis of the polyphosphatidylinositols, may be responsible for some of the physiological events regulated by TRH. Because diacylglycerol is an activator of protein kinase C, we have examined a role for this enzyme in TRH action. The subcellular distribution of protein kinase C in control and TRH-treated cells was determined by measuring both enzyme activity and 12,13-[3H]phorbol dibutyrate binding in the cytosol and by measuring enzyme activity in the particulate fraction. Acute exposure of GH4C1 cells to TRH resulted in a decrease of cytosolic protein kinase C, and an increase in the level of the enzyme associated with the particulate fraction. The redistribution of protein kinase C induced by TRH was dose- and time-dependent, with maximal effects occurring within the first minute of TRH treatment. Analogs of TRH which do not bind to the TRH receptor did not induce redistribution of protein kinase C, while the active analog, methyl-TRH, did promote redistribution. Treatment of GH4C1 cells with phorbol myristate acetate also resulted in a shift in protein kinase C distribution, although the response was slower than that produced by TRH. TRH-induced redistribution of protein kinase C implies translocation of the enzyme from a soluble to a membrane-associated form. Because protein kinase C requires a lipid environment for activity, association with the membrane fraction of the cell suggests activation of the enzyme; thus, protein kinase C may play a role in some of the actions of TRH on GH4C1 cells." @default.
• W7299164 created "2016-06-24" @default.
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• W7299164 date "1985-07-01" @default.
• W7299164 modified "2023-09-27" @default.
• W7299164 title "Thyrotropin-releasing hormone induces redistribution of protein kinase C in GH4C1 rat pituitary cells." @default.
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• W7299164 doi "https://doi.org/10.1016/s0021-9258(17)39482-6" @default.
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