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• W2072283132 startingPage "73" @default.
• W2072283132 abstract "Responses to opioid agonists vary, depending on past opioid exposure and the physiological state. The intracellular signaling pathway mediated by cAMP and protein kinase A (PKA) has been linked to regulation of opioid receptor responsiveness. The role of the cAMP-PKA pathway in regulating opioid receptor gene expression is incompletely defined. Mu-opioid receptor (MuOR) and orphanin FQ/nociceptin receptor (ORL(1)) transcripts were measured after activating this pathway in human neuroblastoma cells. Human SH-SY5Y neuroblastoma cells were maintained in continuous monolayer culture. Cells were incubated with combinations of agents which activate the cAMP-PKA signal transduction pathway, including forskolin and choleratoxin (CTX). MuOR and ORL(1) transcript levels were measured by hybridization to specific probes. Activation of the cAMP-PKA signal transduction pathway with forskolin in the presence of phosphodiesterase inhibitors was associated with a time-dependent decrease in the level of MuOR mRNA; partial recovery was observed with prolonged incubations. Forskolin effects were mimicked by CTX, but not by dideoxyforskolin. The PKA inhibitor H89 blunted the actions of forskolin. However, forskolin responses persisted despite coincubation with protein synthesis inhibitors. ORL(1) transcript levels did not significantly change, but vasoactive intestinal polypeptide (VIP) transcripts exhibited substantial increases, in the presence of forskolin or CTX. These observations support a role for cAMP in regulating MuOR responsiveness through actions at the level of receptor gene expression. ORL(1) transcript levels are not effected, suggesting that the cAMP-PKA pathway has differential effects on the expression of mRNA for different, but biochemically closely related, opioid receptor subtypes." @default.
• W2072283132 created "2016-06-24" @default.
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• W2072283132 date "2002-07-01" @default.
• W2072283132 modified "2023-10-16" @default.
• W2072283132 title "Orphanin FQ/nociceptin and μ-opioid receptor mRNA levels in human SH-SY5Y neuroblastoma cells: effects of activating the cAMP–PKA signal transduction pathway" @default.
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• W2072283132 doi "https://doi.org/10.1016/s0006-8993(02)02720-8" @default.
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