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- W322716401 abstract "The authors were interested in characterizing the relative importance of central (cerebral, spinal) and peripheral opioid receptors in inhibition of gastrointestinal transit. The mu-receptor selective agonist, (NMePhe/sup 3/,D-Pro/sup 4/)morphiceptin (PL017), was evaluated for its effectiveness in slowing gastrointestinal transit after subcutaneous, intracerebroventricular (i.c.v.) or intrathecal (i.th.) administration when given alone or after pretreatment with naloxonazine, an irreversible mu/sub 1/ selective opioid receptor antagonist. Male, ICR mice (20-25 g) were pretreated with saline, naloxone or naloxonazine (35 mg/kg, s.c.) 25 hr prior to testing. Gastrointestinal transit was evaluated in previously fasted (18 hr) mice by oral administration of a liquid radiolabelled marker (Na/sub 2//sup 51/CrO/sub 4/). I.th. PL017 (100-1000 ng) was effective in slowing transit, but was essentially insensitive to naloxone or naloxonazine pretreatment. PL017 produced a dose-related inhibition of transit when given by either the i.c.v. (100-1000 ng) or s.c.(1-10 mg/kg) route; this effect was not sensitive to naloxone pretreatment but was antagonized by naloxonazine. These results indicate that the opioid receptors mediating gastrointestinal transit in the brain and periphery may be mu/sub 1/. In contrast, the insensitivity to naloxonazine suggests that the gastrointestinal effects of PL017 in the spinal cord may be the result of activation of mu/sub 2/more » or possibly delta opioid receptors.« less" @default.
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- W322716401 date "1986-03-05" @default.
- W322716401 modified "2023-09-23" @default.
- W322716401 title "Cerebral, spinal and peripheral inhibition of gastrointestinal transit by PI017: differential antagonism by naloxonazine" @default.
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