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- W2040276616 abstract "Primary neuronal enriched cultures were incubated with mu (morphine, 10(-5) M), delta (DPDPE, 10(-6) M) and kappa (U-50,488H, 10(-5) M) receptor agonists for 5 days, respectively. Thereafter the acute inhibitory actions of mu, delta or kappa receptor agonists on forskolin stimulated cAMP accumulation was assayed. The effect of long term opioid treatment on the steady-state level of G-protein mRNA (G alpha s, G alpha i-1 and G alpha i-2) was analyzed using an RNAase protection hybridization assay. Incubation for 5 days with kappa receptor agonist resulted in an attenuated ability to decrease the accumulation of cAMP by kappa receptors, as well as mu and delta receptors, which was also observed after 5 days of incubation with the delta receptor agonist. Furthermore, the adenylate cyclase responsiveness to forskolin stimulation was markedly reduced in cultures treated with either delta or kappa receptor agonists. Five days of incubation with kappa receptor agonist resulted in an increase in the levels of G alpha s and G alpha i-2 mRNAs. No effects on the amounts of G alpha s mRNA, G alpha i-1 mRNA or G alpha i-2 mRNA were detected after 5 days of delta receptor stimulation. On the other hand, 5 days of mu receptor stimulation decreased the amounts of G alpha s, G alpha i-1 and G alpha i-2 mRNA. Incubation with kappa receptor agonist for 24 h resulted in a significant decrease in the forskolin-stimulated accumulation of cAMP. The stimulatory effect of forskolin was further decreased after 3 days incubation with kappa receptor agonist.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2040276616 title "Altered amounts of G-protein mRNA and cAMP accumulation after long-term opioid receptor stimulation of neurons in primary culture from the rat cerebral cortex" @default.
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- W2040276616 doi "https://doi.org/10.1016/0169-328x(92)90099-w" @default.
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