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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Capsaicin evokes hypothermia independent of cannabinoid CB1 and CB2 receptors.

The present study investigated a potential role for cannabinoid CB(1) and CB(2) receptors in capsaicin-evoked hypothermia. Capsaicin (1 mg/kg, s.c.) caused rapid and significant hypothermia in rats. Pretreatment with SR 141716A (1, 2.5 and 5 mg/kg, i.p.), a CB(1) antagonist, or SR 144528 (1, 2.5 and 5 mg/kg, i.p.), a CB(2) antagonist, did not affect capsaicin-induced hypothermia. In separate experiments, the hypothermia caused by WIN 55212-2 (5 mg/kg, i.m.), a cannabinoid agonist, was not significantly altered by capsazepine (10 and 30 mg/kg, i.p.) or SB 366791 (2 mg/kg, i.p.), a novel TRPV1 antagonist. These data suggest that capsaicin causes hypothermia by a CB(1)- and CB(2)-independent mechanism, and that WIN 55212-2 causes hypothermia by a TRPV1-independent mechanism.[1]


  1. Capsaicin evokes hypothermia independent of cannabinoid CB1 and CB2 receptors. Ding, Z., Cowan, A., Rawls, S.M. Brain Res. (2005) [Pubmed]
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