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Related Experiment Videos

Endogenous nitric oxide promotes ileal absorption

M M Maher1, J D Gontarek, R E Jimenez

  • 1Department of Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland 21287-4606, USA.

The Journal of Surgical Research
|June 1, 1995
PubMed
Summary
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Nitric oxide (NO) plays a key role in regulating ileal water and ion transport. Inhibiting NO synthesis increases fluid secretion, while NO donors or substrates enhance absorption.

Area of Science:

  • Gastroenterology
  • Physiology
  • Molecular Biology

Background:

  • Nitric oxide (NO) is synthesized from L-arginine by nitric oxide synthase (NOS) in the endothelium and enteric nervous system.
  • The role of NO in modulating intestinal water and ion transport remains incompletely understood.

Purpose of the Study:

  • To investigate the hypothesis that NO modulates water and ion transport in the canine ileum.
  • To elucidate the specific mechanisms by which NO influences intestinal fluid and electrolyte balance.

Main Methods:

  • NADPH diaphorase staining to identify NOS activity in canine ileal tissue.
  • In vivo absorption studies using Thiry-Vella fistulas (TVF) in dogs to quantify water, ion, and glucose transport.
  • Luminal administration of L-arginine (NOS substrate), L-NAME (NOS inhibitor), and other agents to assess their effects on ileal transport.

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Main Results:

  • NOS activity was confirmed in the ileal mucosa and submucosa.
  • L-arginine and a NO donor (SNAP) significantly increased water and ion absorption.
  • L-NAME administration resulted in decreased absorption, a prosecretory effect reversed by L-arginine.

Conclusions:

  • Endogenous NO maintains a proabsorptive effect on water and ion transport in the ileum.
  • Inhibition of NO synthesis leads to a prosecretory response, highlighting NO's crucial role in intestinal fluid homeostasis.