Discriminative stimulus control by the anxiogenic beta-carboline FG 7142: generalization to a physiological stressor.
Male; Animals; Rats; Discrimination Learning/*drug effects; Avoidance Learning/drug effects; Appetite Depressants/*pharmacology; Carbolines/*pharmacology; Stress; Inbred Strains; Generalization; Stimulus/*drug effects; Physiological/*psychology
Drug discrimination was employed to investigate the similarities between FG
Leidenheimer N J; Schechter M D
Pharmacology, biochemistry, and behavior
1988
1988-06
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Evidence for noradrenergic involvement in mediating the FG 7142 discriminative stimulus.
Adrenergic alpha-Antagonists/pharmacology; Animals; Appetite Depressants/*pharmacology; Carbolines/*pharmacology; Clonidine/pharmacology; Dioxanes/pharmacology; Discrimination (Psychology)/*drug effects; Electroshock; Generalization; Idazoxan; Male; Norepinephrine/*physiology; Psychological/psychology; Rats; Sprague-Dawley; Stimulus/drug effects; Stress; Yohimbine/pharmacology
Rats were trained to discriminate the stimulus properties of the benzodiazepine receptor partial inverse agonist beta-carboline-3-carboxylate acid methyl amide (FG 7142) (5.0 mg/kg) or the alpha 2-adrenergic receptor antagonist 17 alpha-hydroxyyohimban-16 alpha-carboxylic acid methyl ester (yohimbine) (3.0 mg/kg) from vehicle in a two-lever, food-motivated operant task. These compounds have in common a beta-carboline structure and anxiogenic behavioral profiles. The yohimbine discriminative stimulus was mimicked by the alpha 2-adrenergic receptor antagonist idazoxan and antagonized by the alpha 2-adrenergic receptor agonist clonidine, indicating that the yohimbine stimulus was mediated through the alpha
Leidenheimer N J; Schechter M D
Pharmacology, biochemistry, and behavior
1992
1992-09
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1016/0091-3057(92)90641-r" target="_blank" rel="noreferrer noopener">10.1016/0091-3057(92)90641-r</a>
Interaction of ethanol and tetrahydro-beta-carboline (THBC) in a discriminative task.
Male; Animals; Rats; Ethanol/*pharmacology; Behavior; Drug Interactions; Discrimination Learning/*drug effects; Conditioning (Psychology)/drug effects; Carbolines/*pharmacology; Dose-Response Relationship; Drug; Inbred Strains; Animal/drug effects
Rats (n = 10) were trained to discriminate between ethanol (600 mg/kg, IP) and its vehicle, or between THBC (20 mg/kg) and its vehicle in a two-lever food-motivated operant task. Once the discriminative training criterion was attained, rats in each group were administered different doses of both ethanol and THBC. The ED50 of ethanol in the ethanol-trained rats was 298.0 mg/kg and 15 mg/kg THBC produced ethanol-like responding. The ED50 of THBC in the THBC-trained rats was 3.63 mg/kg and 1200 mg/kg ethanol produced THBC-like responding. The cross-generalization between ethanol and THBC is, thus, indicated and relates to previous evidence in which both ethanol- and THBC-trained rats generalize to a common agent, TFMPP, a putatively specific 5HT1B receptor agonist. Taken together, these observations suggest that beta-carbolines may play a role in the discriminative stimulus properties of ethanol.
Schechter M D; Signs S A
Alcohol (Fayetteville, N.Y.)
1988
1988-08
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1016/0741-8329(88)90075-4" target="_blank" rel="noreferrer noopener">10.1016/0741-8329(88)90075-4</a>
Tetrahydro-beta-carboline may produce its stimulus effects via 5HT1B receptors.
Male; Animals; Rats; Serotonin/*metabolism; Piperazines/pharmacology; Discrimination Learning/drug effects; Serotonin Antagonists/pharmacology; Carbolines/*pharmacology; Metergoline/pharmacology; Inbred Strains; Receptors
To further clarify the role of 5-hydroxytryptamine (5HT) in the behavioral effects of tetrahydro-beta-carboline, male rats were trained to discriminate either 20 mg/kg THBC from its vehicle (n = 10) or 2.0 mg/kg fenfluramine from saline (n = 5). THBC was observed to produce fenfluramine-like effects in the fenfluramine-trained rats while fenfluramine produced THBC-like effects in the
Schechter M D
Pharmacology, biochemistry, and behavior
1987
1987-09
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).