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GABAA receptors modulate cannabinoid-evoked hypothermia
S M Rawls1, R J Tallarida, D A Kon
1Department of Pharmaceutical Sciences, Temple University School of Pharmacy, 3307 N. Broad Street, Philadelphia, PA 19140, USA. scott.rawls@temple.edu
Pharmacology, Biochemistry, and Behavior
|May 26, 2004
Summary
Cannabinoid agonists cause hypothermia by activating GABA(A) receptors, not GABA(B) receptors. This study reveals a functional link between cannabinoid and GABA systems in regulating body temperature.
Area of Science:
- Neuroscience
- Pharmacology
- Physiology
Background:
- Cannabinoids and GABA are known to induce hypothermia through distinct receptor pathways.
- Cannabinoid CB(1) receptor activation increases GABA release in the hypothalamus, suggesting a potential interaction in thermoregulation.
Purpose of the Study:
- To investigate the role of GABA receptors in mediating the hypothermic effects of the cannabinoid agonist WIN 55212-2.
- To explore whether CB(1) receptors are involved in hypothermia induced by GABA receptor agonists.
Main Methods:
- Administration of WIN 55212-2 to male Sprague-Dawley rats to induce hypothermia.
- Testing the effects of GABA(A) antagonist bicuculline and GABA(B) antagonist SCH 50911 on WIN 55212-2-induced hypothermia.
- Evaluating the impact of CB(1) receptor antagonist SR141716A on hypothermia induced by GABA(A) agonist muscimol and GABA(B) agonist baclofen.
Main Results:
- WIN 55212-2 caused significant hypothermia.
- GABA(A) antagonist bicuculline attenuated WIN 55212-2-induced hypothermia, while GABA(B) antagonist SCH 50911 did not.
- Neither bicuculline nor SCH 50911 alone altered body temperature.
- CB(1) receptor blockade did not affect hypothermia induced by muscimol or baclofen.
Conclusions:
- GABA(A) receptors play a crucial role in the hypothermic effects of cannabinoid agonists.
- The findings support a functional link between the cannabinoid and GABA systems in the regulation of body temperature, specifically implicating GABA(A) receptors.