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ECL cell morphology.

D Chen1, C M Zhao, K Andersson

  • 1Department of Pharmacology, University of Lund, Sweden.

The Yale Journal of Biology and Medicine
|August 26, 1999
PubMed
Summary
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Rat stomach enterochromaffin-like (ECL) cells store histamine and pancreastatin in granules. These cells utilize exocytosis and crinophagy for secretion and degradation, involving proteins like VMAT-2.

Area of Science:

  • Cell Biology
  • Gastroenterology
  • Histology

Background:

  • Enterochromaffin-like (ECL) cells in the rat stomach are crucial for regulating gastric acid secretion.
  • Understanding the molecular mechanisms of histamine and pancreastatin storage and release from ECL cells is essential.

Purpose of the Study:

  • To investigate the subcellular localization of histamine, pancreastatin, and related proteins within rat stomach ECL cells.
  • To elucidate the pathways involved in the secretion and degradation of substances stored in ECL cells.

Main Methods:

  • Immunohistochemistry at light, confocal, and electron microscopic levels.
  • Stereological methods combined with electron microscopy.
  • Analysis of hypergastrinemic rat models.

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Main Results:

  • Histamine and pancreastatin are stored in granules and secretory vesicles, while histidine decarboxylase is in the cytosol of ECL cells.
  • ECL cells express key proteins involved in vesicular transport and membrane fusion, including VMAT-2, synaptophysin, and syntaxin.
  • Evidence supports both exocytotic and crinophagic pathways in ECL cells, with crinophagy leading to lipofuscin formation in hypergastrinemic conditions.

Conclusions:

  • Rat stomach ECL cells employ distinct pathways for secretion and degradation.
  • Vesicular monoamine transporter type 2 (VMAT-2) plays a role in histamine uptake into granules.
  • Crinophagy contributes to the turnover of secretory vesicles and the formation of lipofuscin bodies in ECL cells.