Therapeutic Action of Honokiol on Postoperative Ileus via Downregulation of iNOS Gene Expression

AbstractPostoperative ileus is a common complication after intra-abdominal surgery. Nitric oxide produced by macrophages in the inflamed gastrointestinal tract plays a crucial role in the pathogeny of postoperative ileus. Honokiol, extracted from the bark ofMagnolia spp., is a natural compound with a biphenolic structure. In the present study, we examined the effect of honokiol on postoperative ileus and discussed its site of action. Postoperative ileus model mice were generated by surgical intestinal manipulation. Mice were administered honokiol (10  mg kg−1,per os) 1  h before and after intestinal manipulation. Gastrointestinal transit, leukocyte infiltration, and messenger RNA (mRNA) expression of inflammatory mediators were measured in postoperative ileus model mice with or without honokiol. We also investigated the inflammatory effect of honokiol in lipopoly saccharide-stimulated peritoneal macrophages. Gastrointestinal transit was delayed in postoperative ileus model mice and honokiol recovered the impaired transit. Honokiol significantly inhibited leukocyte infiltration and upregulation of proinflammatory cytokines (tumor necrosis factor-α, interleuk in-1β, and interleukin-6) and inducible nitric oxide synthase in the ileal muscle layer of postoperative ileus model mice. In peritoneal macrophages activated by lipopolysaccharide, honokiol significantly inhibited the upregulated mRNA expression of proinflammatory cytokines and inducible nitric ox ide synthase. Hon...
Source: Inflammation - Category: Allergy & Immunology Source Type: research