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Updated: Aug 15, 2026

Visualization of the Interstitial Cells of Cajal (ICC) Network in Mice
09:45

Visualization of the Interstitial Cells of Cajal (ICC) Network in Mice

Published on: July 27, 2011

The centenary of the problem of the interstitial cells of Cajal

S Kobayashi1

  • 1Department of Anatomy, Nagoya University School of Medicine, Japan.

Kaibogaku Zasshi. Journal of Anatomy
|December 1, 1996
PubMed

Insights

Intestinal pacemaker cells are not interstitial cells of Cajal but specialized smooth muscle cells. This study reevaluates Cajal

Area of Science:

  • Gastroenterology
  • Neuroscience
  • Cell Biology

Background:

  • Intestinal pacemaker cells are crucial for gut motility but their cellular identity is debated.
  • The term 'interstitial cells of Cajal' has been historically applied to diverse histological structures, including fibroblasts and smooth muscle cells.
  • Santiago Ramón y Cajal described these cells as a unique 'neuron system' composed of glial and nerve cells.

Purpose of the Study:

  • To clarify the cellular identity of intestinal pacemaker cells.
  • To re-evaluate Cajal's original descriptions in light of modern histological understanding.
  • To investigate the cellular basis of regular mechanical contractions in the guinea-pig colon.

Main Methods:

  • Histological examination of intestinal tissues.
  • Analysis of mechanical contractions in the guinea-pig colonic flexure.
  • Re-examination of Cajal's historical descriptions and drawings.

Main Results:

  • Identified a unique smooth muscle tissue responsible for rhythmic contractions (10-12 cycles/min) in the guinea-pig colon.
  • Demonstrated that intestinal pacemaker cells are distinct from the structures Cajal described.
  • Showed that Cajal's 'interstitial cells' were a composite of glial cells and nerve terminals, not true pacemakers.

Conclusions:

  • Intestinal pacemaker cells are specialized smooth muscle cells, not the interstitial cells of Cajal.
  • Cajal's historical descriptions require reinterpretation based on current cell biology.
  • This finding clarifies the cellular mechanisms underlying gastrointestinal motility.

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