U-50,488, a selective kappa opioid agonist: comparison to other reputed kappa agonists.

Abstract:

:1. U-50,488 is a structurally novel, non-mu opioid. In the present experiments it was compared to the reputed kappa opioid agonists, ketazocine, ethylketocyclazocine and bremazocine as regards analgesic cross tolerance to morphine and U-50,488, antagonism of analgesia by naloxone and MR-2266 (in vivo pA2 determination), and narcotic antagonist properties (antagonism of morphine analgesia and precipitation of abstinence in morphine-dependent mice). 2. The analgesic mechanism of bremazocine was similar to that of U-50,488 but the former compound had, in addition, considerable mu-antagonist activity. The analgesic mechanisms of the ketazocines were less selective; both shared both mu and kappa agonist properties. U-50, 488, however, had no such mu agonist or antagonist effects and thus is a more selective kappa agonist. 3. This compound and its congeners may prove useful in the elucidation of the functions of kappa receptors in the central nervous system.

authors

Von Voigtlander PF,Lewis RA

doi

10.1016/s0278-5846(82)80130-9

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

467-70

issue

4-6

eissn

0278-5846

issn

1878-4216

pii

S0278-5846(82)80130-9

journal_volume

6

pub_type

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