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Current concepts in gastric microcirculatory pathophysiology.

P H Guth1

  • 1Medical Service, VA Medical Center West Los Angeles, CA 90073.

The Yale Journal of Biology and Medicine
|November 1, 1992
PubMed
Summary
This summary is machine-generated.

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The gastric mucosa protects itself from acid damage by increasing blood flow, a response mediated by capsaicin-sensitive sensory nerves releasing calcitonin gene-related peptide. Nitric oxide and neutrophils also play roles in regulating this protective mechanism and preventing injury.

Area of Science:

  • Gastroenterology
  • Physiology
  • Neuroscience

Background:

  • The gastric mucosa has a protective mechanism involving increased blood flow to counteract acid back-diffusion.
  • The precise signaling pathways for this protective hyperemia were not fully understood until recently.

Purpose of the Study:

  • To elucidate the mechanisms underlying the protective increase in gastric mucosal blood flow.
  • To investigate the roles of capsaicin-sensitive nerves, nitric oxide, and neutrophils in gastric mucosal protection.

Main Methods:

  • Investigated the innervation of the gastric mucosa and submucosa by capsaicin-sensitive sensory nerve fibers.
  • Examined the release of calcitonin gene-related peptide (CGRP) from these nerves in response to acid back-diffusion.
  • Assessed the role of nitric oxide (NO) in basal and stimulated gastric mucosal blood flow.

Related Experiment Videos

  • Evaluated the contribution of neutrophils to gastric mucosal injury.

    • Main Results:

    • Capsaicin-sensitive sensory neurons signal for increased blood flow via CGRP release during acid back-diffusion.
    • Nitric oxide is crucial for maintaining basal gastric mucosal blood flow and enhancing it during acid secretion.
    • Neutrophils contribute to mucosal injury by occluding microvessels and releasing damaging mediators.

    Conclusions:

    • A protective hyperemia mechanism exists in the gastric mucosa, mediated by capsaicin-sensitive nerves and CGRP.
    • Nitric oxide and neutrophils are key players in regulating gastric microcirculation and mucosal integrity.
    • Understanding these mechanisms is vital for developing strategies against gastric mucosal injury.