IL-1 Receptor Antagonist Blocks the Lipopolysaccharide-Induced Inhibition of Gastric Motility in Freely Moving Conscious RatsReport as inadecuate




IL-1 Receptor Antagonist Blocks the Lipopolysaccharide-Induced Inhibition of Gastric Motility in Freely Moving Conscious Rats - Download this document for free, or read online. Document in PDF available to download.

Digestive Diseases and Sciences

, Volume 57, Issue 10, pp 2555–2561

First Online: 19 May 2012Received: 13 February 2012Accepted: 25 April 2012

Abstract

Background and AimsEndotoxin-lipopolysaccharide LPS alters gastrointestinal functions. However, little is known as to whether LPS could change gastric antral contractility in freely moving conscious animals. We tried to clarify this problem and the associated mechanisms.

MethodsIn this study, we recorded intraluminal gastric pressure waves in freely moving conscious rats by manometric catheter located in the antrum. Area under the manometric trace was evaluated as motor index MI.

ResultsIntraperitoneal injection of LPS at doses of 0.2 mg-kg or more significantly inhibited MI. The inhibition started immediately after the administration of LPS and lasted over 1 h. Intraperitoneal injection of IL-1β potently decreased MI while neither IL-6 nor TNF-α inhibited gastric motility, suggesting IL-1β specifically reduced gastric motility. Next, we examined the hypothesis that endogenous IL-1 mediates the LPS-induced inhibition of gastric motility. To address the speculation, an IL-1 receptor antagonist IL-1Ra was used to block IL-1 signaling. Pretreatment with IL-1Ra at a dose of 20 mg-kg significantly blocked the inhibition of gastric contractility by LPS at a dose of 0.2 mg-kg.

ConclusionsThese results suggest for the first time that LPS or IL-1β is capable of inhibiting gastric motility in conscious rats and that endogenously released IL-1 may mediate the LPS-evoked inhibition of gastric antral motility. This evidence also led us to speculate that IL-1Ra may be a therapeutic tool for patients with disturbed gastrointestinal functions under septic conditions.

KeywordsLipopolysaccharide IL-1 IL-1 receptor antagonist Gastric motility Rat AbbreviationsLPSLipopolysaccharide

IL-1RaIL-1 receptor antagonist

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Author: Yoshihiro Tsuchiya - Tsukasa Nozu - Shima Kumei - Masumi Ohhira - Toshikatsu Okumura

Source: https://link.springer.com/







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