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- W2260531808 abstract "Preliminary evidence had suggested that changes in cyclic GMP (cGMP) hydrolysis via cyclic nucleotide phosphodiesterase(s) occurred during development of tolerance to morphine. To examine this finding further and its possible role in development of tolerance to morphine, rats (150-175 g) were injected with 1 ml of a sustained-release morphine preparation (40 mg/ml). Control rats received 1 ml of the oily vehicle. Antinociception, decreased locomotor activity, respiratory depression and mydriasis were measured at various times from 0.5 through 96 hr of exposure to the drug. Particulate and soluble cGMP hydrolysis were measured for the same time periods from periaqueductal gray (PAG), striatum, medulla and oculomotor nucleus, the brain areas believed to mediate the respective behaviors. Each of the behaviors except mydriasis showed development of complete tolerance (no difference from control behaviors) during the 96 hr of continuous exposure. During development of tolerance, particulate cGMP hydrolysis decreased in PAG and increased in striatum and medulla. Particulate cGMP hydrolysis was not altered in oculomotor nucleus, the brain area mediating mydriasis to which tolerance development was partial or incomplete. Significant changes in soluble cGMP hydrolysis occurred only in PAG before decline in the behavioral effect and did not appear to be involved in tolerance phenomena. Modulation of cyclic nucleotide levels by changes in particulate cGMP hydrolysis may produce or allow for development of complete tolerance to various morphine-induced behaviors." @default.
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- W2260531808 date "1990-01-01" @default.
- W2260531808 modified "2023-09-23" @default.
- W2260531808 title "Evidence for involvement of cyclic GMP phosphodiesterase in morphine tolerance." @default.
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