The effect of Taraxacum officinale on gastric emptying and smooth muscle motility in Rodents

Authors


Address for Correspondence
Present address: Nan Ge Jin, Department of Neurobiology and Anatomy, University of Texas Medical School, Houston, TX 77030, USA.
Tel: +1 713 5005636; fax: +1 713 5000621;
e-mail: nangejin@gmail.com
Yong-Ri Jin, Department of Gastroenterology and Hepatology, The Affiliated Hospital of Yanbian University College of Medicine, 121 Juzi Street, Yanji 133000, Jilin Province, China. Tel: +86 433 2660061; fax: +86 433 2513610; e-mail: yongrijin@yahoo.com
Present address: Jingling Jin, Huffington Center on Aging and Department of Pathology and Immunology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.

Abstract

Background Taraxacum officinale (TO) is a traditional herbal medicine that has been widely used for abdominal illnesses. However, the efficacy and the mechanism of TO on gastric emptying (GE) and smooth muscle motility are unknown.

Methods  Ethyl acetate fraction (EA), n-butanol fraction (BF), and aqueous fraction (AF) were prepared in succession from 70% ethanol extract (EE) of TO using solvent polarity chromatography. Phenol red meal was adopted to estimate GE in mice. A polygraph was used to measure the smooth muscle motility in rats.

Key Results  The percentage of GE was 48.8 ± 6.1% (vehicle control), 75.3 ± 6.5% (cisapride positive control), 68.0 ± 6.7% (EE), 53.3 ± 6.0% (EA), 54.1 ± 6.3% (AF), and 86.0 ± 6.5% (BF). Thus, BF was determined to be most effective in accelerating GE. This stimulatory effect of BF on GE was also supported by the observation that BF increased spontaneous contraction of gastric fundus and antrum and decreased the spontaneous motility of pyloric sphincter in vitro. Atropine blocked the stimulatory effect of BF on GE, whereas phentolamine and propranolol had no effect.

Conclusions & Inferences  BF seems to be a promising prokinetic agent. BF-induced increase in the contraction of fundus and antrum contributes to an increase in the intra-gastric pressure. BF-induced decrease in the motility of pyloric sphincter contributes to a decrease in the resistance of food from the stomach to the small intestine. The acceleration of GE by BF is likely to be exerted through cholinergic stimulation.

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