Affiliation:
1. Department of Experimental Pharmacology, University of Naples “Federico II”, Via D. Montesano 49, 80131 Naples, Italy
2. School of Pharmacy, University of Salerno, Italy
3. Department of Pharmaceutical Chemistry, University of Naples “Federico II”, Via D. Montesano 49, 80131 Naples, Italy
Abstract
Abstract
Intraperitoneal administration of some flavonoids (apigenin, flavone, kaempferol, morin, myricetin, naringin and rutin; 12·5–50 mg kg−1) significantly (P < 0·05–0·01) reduced small (28–69%) and large (83–134%) intestinal transit in mice. Other flavonoids (naringenin, silibinin, silymarin and taxifolin, 100–200 mg kg−1) reduced (23–41%; P < 0·5–0·01) intestinal transit at doses of 100–200 mg kg−1 while hesperitin, catechin and phloridzin (up to 200 mg kg−1) had no effect. This effect was antagonized by yohimbine (87–96%) and phentolamine (87–91%) but not by prazosin, propranolol, atropine, hexamethonium, mepyramine, cyproheptadine and naloxone. Yohimbine (92–96%) also antagonized the inhibitory effect of flavonols (12·5–50 mg kg−1) (P < 0·05–0·01) on intraluminal accumulation of fluid and diarrhoea induced by castor oil. By contrast, verapamil potentiated the flavonol effect. It is suggested that these effects, influenced by the structure of the molecules, are mediated by α2-adrenergic receptors and calcium.
Publisher
Oxford University Press (OUP)
Subject
Pharmaceutical Science,Pharmacology
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