Modification of small bowel mechanosensitivity by intestinal fat.

Abstract:

BACKGROUND:Lipids may exacerbate symptoms induced by gut stimuli. AIM:To determine the mechanism whereby fat exerts this effect. SUBJECTS:Twenty four healthy subjects were studied during fasting. METHODS:We measured perception (0-6 scale) in response to jejunal balloon distension and transmucosal electrical nerve stimulation; phasic stimuli (one minute) were randomly applied at five minute intervals during intestinal infusion (2 ml/min) of saline and then Intralipid 2 kcal/min (high fat; n=8 subjects), Intralipid 0.5 kcal/min (low fat; n=8), or saline (n=8). RESULTS:Intestinal lipids increased the perception of jejunal distension regardless of concentration (by 53% with high fat, 49% with low fat, and 17% with saline; p<0.05 for both fat loads). This effect could not be attributed to changes in intestinal compliance as intraballoon pressures remained unchanged during lipid infusion (2% change; NS). Sensitisation induced by lipids seemed to be specifically related to intestinal mechanoreceptors because electrical stimulation, which non-specifically activates gut afferents, was perceived equally during saline and lipid administration (10%, 11%, and 15% change during high fat, low fat, and saline, respectively; NS). CONCLUSION:Physiological amounts of lipids heighten intestinal sensitivity by modulating intestinal mechanoreceptor response.

journal_name

Gut

journal_title

Gut

authors

Accarino AM,Azpiroz F,Malagelada JR

doi

10.1136/gut.48.5.690

keywords:

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

690-5

issue

5

eissn

0017-5749

issn

1468-3288

journal_volume

48

pub_type

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