Yohimbine is a 5-HT1A agonist in rats in doses exceeding 1 mg/kg

NEUROSCIENCE LETTERS

卷:606

Article

Zaretsky, Dmitry V.¹  Zaretskaia, Maria V.¹  DiMicco, Joseph A.²  Rusyniak, Daniel E.^1,2 

[1] Indiana Univ Sch Med, Dept Emergency Med, Indianapolis, IN 46202 USA

[2] Indiana Univ Sch Med, Dept Pharmacol & Toxicol, Indianapolis, IN 46202 USA

关键词: Yohimbine;    5-HT1A receptors;    Body temperature;    Locomotor activity;   

DOI  :  10.1016/j.neulet.2015.09.008

来源: Elsevier

【 摘 要 】

Yohimbine is a prototypical alpha2-adrenergic receptor antagonist. Due to its relatively high selectivity, yohimbine is often used in experiments whose purpose is to examine the role of these receptors. For example, yohimbine has been employed at doses of 1-5 mg/kg to reinstate drug-seeking behavior after extinction or to antagonize general anesthesia, an effects presumably being a consequence of blocking alpha2-adrenergic receptors. In this report we characterized dose-dependent autonomic and behavioral effects of yohimbine and its interaction with an antagonist of 5-HT1A receptors, WAY 100,635. In low doses (0.5-2 mg/kg i.p.) yohimbine induced locomotor activation which was accompanied by a tachycardia and mild hypertension. Increasing the dose to 3-4.5 mg/kg reversed the hypertension and locomotor activation and induced profound hypothermia. The hypothermia as well as the suppression of the locomotion and the hypertension could be reversed by the blockade of 5-HT1A receptors with WAY 100635. Our data confirm that yohimbine possesses 5-HT1A properties, and demonstrated that in doses above 1 mg/kg significantly activate these receptors. (C) 2015 Elsevier Ireland Ltd. All rights reserved.

【 授权许可】

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