A102 MONOSODIUM GLUTAMATE INCREASES VISCERAL SENSITIVITY IN A MURINE MODEL OF IRRITABLE BOWEL SYNDROME

作者：Bailey J. Brant, Yang Yu, Alan Lomax, S Vanner, Caroline J. Tuck · 发表于：Journal of the Canadian Association of Gastroenterology · 年份：2020 · DOI：10.1093/jcag/gwz047.101 · 被引用次数：1 · 研究领域：Biochemical Analysis and Sensing Techniques

Abstract Background Over 70% of patients suffering from symptoms of the irritable bowel syndrome (IBS) report that food is the most common trigger. Patients have identified that monosodium glutamate (MSG) is one food component that they suspect can trigger symptoms, but this remains unproven. As a first step towards establishing a potential role, we sought to examine whether there was a plausible mechanism of how MSG ingestion could underlie exaggerated pain signaling in IBS. Aims To examine the effects of MSG on visceral sensitivity in a murine model of IBS. Methods Balb/c mice were subjected to 6-days of water-avoidance stress (WAS) to create a pre-clinical model for IBS. To assess changes in visceral afferent nerve sensitivity in control and WAS mice, responses to ramp distension (0–60 mmHg), in the absence and presence 10 μM MSG perfused into the intestinal lumen (concentration based on diet analysis of MSG human ingestion), were recorded from afferent nerves innervating the jejunum ex vivo. To quantify these responses, the baseline firing frequency (spikes/second) was subtracted from the maximum response at each distending pressure. The relative distension response was calculated as a percentage of the control distension response (absence of MSG) (Figure 1). Jejunal preparations from the same WAS-treated mice were also used to measure ex vivo changes in mucosal permeability to MSG using Ussing chambers. We also ran the same distension protocol; however, we applied 10 μM ...