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J Pharmacol Sci. 2011;115(2):254-7. Epub 2011 Jan 26.

Biphasic tracheal relaxation induced by higenamine and nantenine from Nandina domestica Thunberg.

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  • 1Laboratory of Pharmacology, Faculty of Pharmacy and Research Institute of Pharmaceutical Sciences, Musashino University, Tokyo 202-8585, Japan.

Abstract

We compared the effects of the extract from fruits of Nandina domestica Thunberg (NDE) and its constituents, higenamine and nantenine, on contractile responses in isolated guinea-pig trachea. NDE (1 mg/ml) caused biphasic relaxation of the trachea precontracted with high-K(+) stimulation: the fast component was blocked by propranolol and mimicked by higenamine; and the slow was resistant to propranolol and mimicked by nantenine. Ca(2+)-induced contraction under high-K(+) stimulation was antagonized by nantenine or NDE + propranolol. These results suggest that NDE relaxes the trachea quickly through β-adrenoceptor stimulation by higenamine and slowly through Ca(2+) antagonism by nantenine.

PMID:
21282929
[PubMed - indexed for MEDLINE]
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