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- W1972885733 abstract "The present study investigated the effect of chronic administration of a kappa opioid receptor agonist on the function of kappa and mu opioid, serotonergic and cholinergic regulation of secretion from the hypothalamo-pituitary-adrenal axis in neonatal rats. After chronic treatment with saline or U50,488H (trans-(+/-)-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl)cyclohexyl]- benzeneacetamide methane sulfonate), a kappa opioid receptor agonist and subsequent pharmacological challenge, corticosterone (CS) in serum was determined. Kappa tolerance did not develop in pups treated on postnatal days 5-9 with increasing doses of U50,488H (0.5-2.5 mg/kg). When the rats were treated with the same chronic regimen of U50,488H at different stages of development from birth through weaning, only weanling rats became tolerant to U50,488H. In the absence of measurable kappa tolerance, the responses of corticosterone in serum to morphine, quipazine, a serotonin receptor agonist and physostigmine, an inhibitor of acetylcholinesterase, were attenuated in neonatal rats, treated with U50,488H. These studies suggest that kappa tolerance is more difficult to induce in developing rats than in adults and that regulation of the function of the hypothalamo-pituitary-adrenal axis by other neurotransmitter systems is altered by treatment with kappa opioid receptor agonists, even in the apparent absence of tolerance." @default.
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- W1972885733 date "1992-02-01" @default.
- W1972885733 modified "2023-09-23" @default.
- W1972885733 title "Chronic administration of U50,488H fails to produce hypothalamo-pituitary-adrenal axis tolerance in neonatal rats" @default.
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- W1972885733 doi "https://doi.org/10.1016/0028-3908(92)90024-j" @default.
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