PMID: 1317039Jan 1, 1992

Discriminative stimulus properties of the benzodiazepine receptor antagonist flumazenil

Psychopharmacology
G A Rowan, I. Lucki

Abstract

Rats were trained to discriminate the stimulus properties of the benzodiazepine (BZ) receptor antagonist flumazenil using a conditioned taste aversion procedure. On drug trials, fluid-restricted rats were injected with flumazenil (32 mg/kg), given access to a 0.25% saccharin solution for 30 min, and injected with LiCl (1.8 mEq/kg IP). On saline trials, injections of saline bracketed the period of saccharin consumption. Acquisition of the discriminated taste aversion, as measured by differential effects on drinking between saline and drug trials, developed after only five pairings of flumazenil with the LiCl injections. Flumazenil did not alter saccharin consumption in unconditioned controls (N = 9) that never received LiCl. The discrimination was also measured by flumazenil's ability to reduce the preference for saccharin over tap water using two-bottle choice tests. Flumazenil demonstrated dose-dependent generalization upon decreasing the training dose as low as 1 mg/kg. Two other BZ receptor antagonists of different chemical structure, CGS 8216 and ZK 93426, substituted completely for the flumazenil stimulus. Partial generalization was exhibited to the partial inverse agonists FG 7142 and beta-CCE, while the full inverse agon...Continue Reading

References

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Related Concepts

CGS 8216
5-isopropoxy-4-methyl-beta-carboline-3-carboxylic acid ethyl ester
Metazoa
Anticonvulsants
Behavior, Animal
Benzodiazepines
Beta-Carbolines
Discrimination (Process of Differentiation)
Dose-Response Relationship, Drug
Romazicon

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