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2014 ; 231
(14
): 2751-8
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Assessment of the kappa opioid agonist, salvinorin A, as a punisher of drug
self-administration in monkeys
#MMPMID24481567
Freeman KB
; Naylor JE
; Prisinzano TE
; Woolverton WL
Psychopharmacology (Berl)
2014[Jul]; 231
(14
): 2751-8
PMID24481567
show ga
RATIONALE: Drugs can function as punishers. However, work on the study of drugs
as punishers is limited, as is the range of compounds known to function as
punishers. Kappa opioid agonists, which have received much experimental attention
as potential therapeutics for drug abuse, reportedly produce aversive effects.
However, kappa agonists have yet to be tested as punishers of behavior.
OBJECTIVE: The goal of the current study was to determine if a kappa agonist
could function as a punisher of drug self-administration. METHOD: In separate
experiments, monkeys were allowed to choose in a two-lever choice design between
intravenous injections of equal doses of either cocaine (0.1 mg/kg/injection on
each lever) or remifentanil (0.1 ?g/kg/injection on each lever) when one of the
two options was mixed with various doses of the kappa agonist, salvinorin A.
RESULTS: Choice for the cocaine and remifentanil options that were combined with
salvinorin A decreased as a function of salvinorin A dose in all monkeys.
However, operant response rates were not systematically affected by salvinorin A
administration. CONCLUSION: The present findings demonstrate that the kappa
agonist, salvinorin A, can punish self-administration of a psychotimulant,
cocaine, and a mu opioid, remifentanil. In consideration of these findings, it
may be possible to curtail the abuse of some drugs by contingently delivering
kappa agonists (e.g., as combination formularies for prescription medications).