Effects of captopril and SQ29,852 on anxiety-related behaviours in rodent and marmoset

Pharmacology, Biochemistry, and Behavior
B CostallD M Tomkins

Abstract

The abilities of the ACE inhibitors captopril and SQ29,852 to modify aversive behaviour was compared to the effects of diazepam in the light/dark exploration test in the mouse, the elevated plus maze and social interaction test in the rat, and in anxiety-related behaviours induced by human threat in the marmoset. In the four tests the acute administration of captopril, SQ29,852 and diazepam had the same profiles of action to reduce aversive responding. This was also observed during chronic administration with the three agents in the mouse. However, withdrawal from a chronic treatment with diazepam precipitated a syndrome of increased aversion, whereas withdrawal from treatment with captopril and SQ29,852 was uneventful, values waning to control levels. Withdrawal from treatment with ethanol, nicotine and cocaine also enhanced aversive responding. Treatment with captopril and SQ29,852 antagonised the behavioural consequences of withdrawal from treatment with diazepam and nicotine and SQ29,852 also blocked the consequences of withdrawal from ethanol and cocaine. It is concluded that captopril and SQ29,852 have an anxiolytic profile of action in 3 species, that cessation of treatment is not associated with a withdrawal syndrome, t...Continue Reading

References

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