Pilot studies to demonstrate that intestinal mucosal afferent nerves are functionally linked to visceral adipose tissue

Felix W. Leung, Vay Liang W Go, Oscar U. Scremin, Andre Obenaus, Michael L. Tuck, Michael S. Golub, Peter Eggena, Joseph Leung

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Dietary capsaicin reduces rodent visceral fat weight. We tested the hypothesis that intact intestinal mucosal afferent nerve function is necessary for fat deposition in visceral adipose tissue sites. Rats were treated daily for 2 weeks with intragastric (chronic treatment) vehicle or capsaicin. Superior mesenteric artery blood flow and mesenteric and inguinal fat blood flow were measured before and after capsaicin was administered into the duodenum (acute treatment). Fat from all sites was dissected and weighed. Chronic capsaicin significantly attenuated acute capsaicin-induced mesenteric hyperemia but did not abolish the reflex wiping of the eye exposed to capsaicin, indicating that functional ablation was limited to the intestinal mucosal afferent nerves. The associated vasoconstriction in adipose tissue was inhibited at the visceral (mesenteric) site and maintained but attenuated at the subcutaneous (inguinal) site. The onset of vasoconstriction was instantaneous, indicating a reflex mechanism. There was a redistribution of fat from visceral to subcutaneous sites, reflected by a decrease and an increase in the percentage of body fat in the visceral and subcutaneous sites, respectively. These pilot studies reveal for the first time that normal intestinal mucosal afferent nerve function is necessary for the physiologic accumulation of fat in visceral adipose tissue sites.

Original languageEnglish (US)
Pages (from-to)2695-2702
Number of pages8
JournalDigestive Diseases and Sciences
Volume52
Issue number10
DOIs
StatePublished - Oct 2007

Keywords

  • Adipose tissue blood flow
  • Capsaicin
  • Capsaicin-sensitive afferent nerves
  • Hydrogen gas clearance
  • Laser Doppler flowmetry
  • Mesenteric artery blood flow
  • Pulse Doppler flowmetry

ASJC Scopus subject areas

  • Gastroenterology

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