Vasopressin produced analgesia in mice as estimated by using abdominal constriction tests (ED50 8.5 micrograms/kg i.v.) or hot plate method (ED50 63 micrograms/kg i.v.). However, vasopressin (10 micrograms/kg i.v.) produced no depression of locomotor activity in mice. Vasotocin had slight analgesic action; oxytocin or norepinephrine had none and there was no direct correlation between pressor response and analgesia. The analgesic action was nonopiate in nature as it was uninfluenced by the narcotic antagonist naltrexone at 5 to 15 mg/kg, but it was reserved by a vasopressin antagonist. Intraventricular administration of vasopressin (1-10 micrograms/kg) to mice produced no significant analgesia, suggesting a primarily peripheral locus of analgesic action. Vasopressin may play a role as an endogeneous pain regulating substance.
Characterization of vasopressin analgesia.
Published 1982 in Journal of Pharmacology and Experimental Therapeutics
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- Publication year
1982
- Venue
Journal of Pharmacology and Experimental Therapeutics
- Publication date
1982-02-01
- Fields of study
Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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