Thiorphan potentiation of stress-induced analgesia in the mouse.

Abstract:

:Experiments were done to examine the analgesic effect of thiorphan alone or in combination with stress in mice. Analgesia was assessed by measuring jump latencies from a 55 degrees C hot plate. Thiorphan exhibited weak analgesic properties evidenced by significant increases in jump latencies only after 300 mg/kg i.p. Additional experiments were done to see the effect of i.c.v. administration of thiorphan in the mouse hot plate test. Control experiments revealed that either i.c.v. saline or sham caused naloxone reversible analgesia which was potentiated by thiorphan (100 mg/kg i.p.). Immobilization stress-induced analgesia was also potentiated by thiorphan (100 mg/kg i.p.) and antagonized by naloxone (10 mg/kg i.p.). The results suggest that stress-induced analgesia in the mouse is associated with an endogenous opioid mechanism which is potentiated when enkephalin degradation is inhibited by thiorphan.

journal_name

Life Sci

journal_title

Life sciences

authors

Greenberg R,O'Keefe EH

doi

10.1016/0024-3205(82)90338-1

subject

Has Abstract

pub_date

1982-09-20 00:00:00

pages

1185-8

issue

12-13

eissn

0024-3205

issn

1879-0631

pii

0024-3205(82)90338-1

journal_volume

31

pub_type

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