PMID: 8968326Dec 1, 1996Paper

Rapid in vivo metabolism of a methylether derivative of (+/-)-BW373U86: the metabolic fate of [3H]SNC121 in rats

The Journal of Pharmacology and Experimental Therapeutics
J A SchetzF Porreca

Abstract

Activation of opioid delta receptors produces antinociception without some of the side-effects associated with activation of mu and kappa receptors. (+/-)-BW373U86 [(+/-)-4-[(alpha-R*)-alpha-((2S*,5R*)-4-allyl-2, 5-dimethyl-1-piperazinyl)-3-hydroxybenzyl]-N,N-diethylbenzamide] is a first generation, racemic nonpeptide, partially delta-selective opioid agonist that produces short-lived antinocioception. After systemic, but not central, administration, (+/-)-BW373U86 is also a naltrindole-reversible convulsant. SNC80 [(+)-4-[9-alpha-R)-alpha-((2S,5RO-4-allyl-2, 5-dimethyl-1-piperazinyl)-3-methoxybenzyl]-N,N-diethylbenzamide] is a chiral methylether derivative of (+/-)-BW373U86 with decreased potency, but greater selectivity for the delta-opioid receptor. Like BW373U86, SNC80 produces brief, nonlethal seizures when administered peripherally, albeit at higher doses. Radiolabeling of SNC80 yields a compound with similar pharmacology named [3H]SNC121. [3H]SNC121 was investigated to determine the relationship between its time course of metabolism and the physiological actions of SNC80. The biotransformation of i.p. administered [3H]SNC121 was established in rats in vivo and in vitro via high-performance liquid chromatography analysis ...Continue Reading

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