Effect of roxithromycin on contractile activity of gastrointestinal smooth muscles in colitic rats

Vijay L. Kumar; Abhimanu Pandey; Hilal Ahmad

doi:10.1515/jbcpp-2020-0051

Article

Effect of roxithromycin on contractile activity of gastrointestinal smooth muscles in colitic rats

Vijay L. Kumar , Abhimanu Pandey and Hilal Ahmad

Published/Copyright: February 9, 2021

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From the journal Journal of Basic and Clinical Physiology and Pharmacology Volume 32 Issue 6

Abstract

Objectives

Roxithromycin, a macrolide antibiotic, has been shown to ameliorate acetic acid induced colitis in rats by suppressing inflammation and oxidative stress. The aim of this study was to evaluate the effect of roxithromycin on small intestinal transit and cholinergic responsiveness of the colonic smooth muscles of colitic rats.

Methods

Colitis was induced in rats by acetic acid and the small intestinal transit was determined by measuring the distance traversed by charcoal meal from the gastro-duodenal junction in 1 h. The test drug roxithromycin, reference drug mesalazine and anti-inflammatory drug diclofenac were administered orally before inducing colitis and their effect on intestinal transit was compared with colitic control group. The effect on cholinergic responsiveness of colonic smooth muscles was evaluated in vitro by plotting a dose-response curve using different concentrations of acetylcholine. The concentration producing 50% of maximal response (EC₅₀) was calculated for all the treatment groups.

Results

The small intestinal transit was enhanced in colitic rats as compared to normal rats (86.00 ± 1.36 vs. 57.00 ± 1.34 cm; p<0.001). Like mesalazine, roxithromycin normalized intestinal transit while diclofenac was ineffective. The results of in vitro experiment show that colitis increased cholinergic responsiveness of the colonic smooth muscles that was not affected by roxithromycin and mesalazine while diclofenac significantly decreased it.

Conclusions

This study shows that like mesalazine, roxithromycin affords protection in colitis mainly by normalizing propulsive movement of the small intestine than by affecting cholinergic responsiveness of the colonic smooth muscles.

Keywords: inflammation; intestinal transit; roxithromycin; ulcerative colitis

Corresponding author: Vijay L. Kumar, Department of Pharmacology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110 029, India, Phone: +91 11 26593681, E-mail: kumarvl98@hotmail.com

Research funding: None declared.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Competing interest: Authors state no conflicts of interest.
Informed consent: Not applicable.
Ethical approval: Approval of Institutional Animal Ethics Committee obtained and number given in manuscript.

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Received: 2020-02-14

Accepted: 2020-10-04

Published Online: 2021-02-09

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Articles in the same Issue

https://doi.org/10.1515/jbcpp-2020-0051

Keywords for this article

inflammation; intestinal transit; roxithromycin; ulcerative colitis