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Open Access Highly Accessed Research article

Prokinetic and laxative effects of the crude methanolic extract of Viola betonicifolia whole plant in rodents

Naveed Muhammad13, Najeeb ur Rehman2, Haroon Khan3, Muhammad Saeed1* and Anwarul-Hassan Gilani24*

Author Affiliations

1 Department of Pharmacy, University of Peshawar, Peshawar, 25120, Pakistan

2 Natural Product Research Unit, Department of Biological and Biomedical Sciences, The Aga Khan University Medical College, Karachi, 74800, Pakistan

3 Gandhara College of Pharmacy, Gandhara University, Peshawar, Pakistan

4 College of Health Sciences, Mekelle University, Mekelle, Ethiopia

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BMC Complementary and Alternative Medicine 2013, 13:70  doi:10.1186/1472-6882-13-70

Published: 27 March 2013

Abstract

Background

The present study was aimed to provide ethnopharmacological basis for the medicinal use of Viola betonicifolia whole plant in indigestion and constipation.

Methods

Mice were used in in-vivo prokinetic and laxative studies while in-vitro experiments were conducted on isolated tissues of rabbit and guinea-pig gut preparations suspended in a tissue bath to measure isotonic contractions.

Results

The crude methanolic extract of Viola betonicifolia (VBME) showed partially atropine-sensitive prokinetic (50 and 100 mg/kg) and laxative (30 and 100 mg/kg) activities in mice. When tested in isolated rabbit jejunum and guinea-pig ileum, VBME caused dose-dependent contractions at 0.01-0.3 mg/mL and 0.03-5 mg/mL, respectively. The spasmogenic effect was partially sensitive to atropine, while the presence of pyrilamine, SB203186 or hexamethonium had no effect in both gut preparations. VBME partially inhibited acetylcholinesterase enzyme (19%) in the in-vitro assay. The spasmodic effect of VBME was more efficacious in guinea-pig ileum than rabbit jejunum preparation. The phytochemical analysis of the crude methanolic extract for total alkaloids and saponins revealed that the VBME is a rich source of alkaloids and saponins.

Conclusions

This study showed the prokinetic and laxative effects of Viola betonicifolia in mice, partially mediated through cholinergic action. The in-vitro spasmodic effect of the plant extract was also partially sensitive to atropine indicating more than one mechanisms in the gut stimulant effect. This study provides a rationale for the medicinal use of Viola betonicifolia in indigestion and constipation.

Keywords:
Viola betonicifolia; Prokinetic; Laxative; Cholinergic; Jejunum; Ileum