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• W2048105534 abstract "Phosphoinositide turnover and calcium mobilization are fundamental determinants of acute and chronic opioid effects. Phosphoinositide-specific phospholipase C (PLC) are key signaling enzymes that play a pivotal role in mediating opioid modulation of inositol trisphosphate production and cytosolic calcium distribution, substrates for many acute and chronic opioid effects. Notably, phosphorylation of the beta isoforms of PLC, by kinases that are up-regulated after chronic morphine, is a potent modality for their regulation. Direct assessment of PLCbeta1 and PLCbeta3 phosphorylation in the guinea pig longitudinal muscle myenteric plexus tissue revealed substantial alterations after the induction of opioid tolerance. Notably, the direction of this modulation is isoform-specific. Phosphorylation of PLCbeta1 is significantly reduced, whereas that of PLCbeta3 is substantially augmented, changes not accompanied by altered content of PLCbeta1 or PLCbeta3 protein. In contrast to chronic morphine, acute morphine treatment of opioid naïve longitudinal muscle myenteric plexus tissue attenuates PLCbeta3 phosphorylation, an effect also manifested by endogenous opioids that is reflected by the ability of acute naloxone to substantially augment PLCbeta3 phosphorylation. This indicates that PLCbeta phosphorylation is dynamically regulated. PLCbeta1 and PLCbeta3 activities are negatively modulated by phosphorylation. Thus, their concomitant reciprocal phosphorylation would alter the relative contribution of these isoforms to PLC/Ca2+ signaling, a significant shift in light of their differential regulatory characteristics. Reciprocal modulation of the phosphorylation (activity) of two isoforms within the same subclass of signaling enzyme, proteins that have a high degree of structural similarity and subserve the same biological function, represents an adaptation modality to chronic morphine that has heretofore not been recognized." @default.
• W2048105534 created "2016-06-24" @default.
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• W2048105534 date "2003-11-03" @default.
• W2048105534 modified "2023-09-26" @default.
• W2048105534 title "Reciprocal modulation of phospholipase Cβ isoforms: Adaptation to chronic morphine" @default.
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• W2048105534 doi "https://doi.org/10.1073/pnas.2335885100" @default.
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