Add time:08/16/2019         Source:sciencedirect.com

repin (cas 11024-67-2) is a sesquiterpene lactone found in Centaurea solstitialis, a plant responsible for Parkinson-like disease in horses. Repin, on intraperitoneal (i.p.) injection, produces a dose-dependent and highly significant hypothermia in naive rats. The hypothermia is long-lasting with a peak 3 h after the injection and a return to normal temperature after more than 8 h. The effects of atropine sulfate, atropine methylbromide, propranolol, metergoline, ketanserin, diphenhydramine and apomorphine pretreatment on repin-induced hypothermia were investigated. None of the pretreatments directly antagonized repin's hypothermic effect. However, partial but significant reversals of hypothermia by atropine sulfate, metergoline, ketanserin, diphenhydramine and apomorphine were observed 2–4 h after the repin injection. These late-onset effects are probably due to secondary physiological mechanisms. On the other hand, propranolol, at 20 mg/kg i.p., clearly accentuated both the early-onset (30–90 min) and late-onset (2–4 h) hypothermic effects of repin.

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