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Gap junction involvement in secretion: the pancreas experience

P Meda1

  • 1Department of Morphology, University of Geneva Medical School, Switzerland.

Clinical and Experimental Pharmacology & Physiology
|December 1, 1996
PubMed
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Gap junctions are crucial for gland cell communication, regulating secretion in pancreatic islets and acini. Different connexin (Cx) expressions in these tissues explain opposing changes in cell communication during secretory function.

Area of Science:

  • Cell biology
  • Endocrinology
  • Gastroenterology

Background:

  • Gap junctions and junction-mediated cell-to-cell communications are essential in all gland cells.
  • Cell-to-cell communication via gap junction channels is vital for the biosynthesis, storage, and release of insulin and amylase in pancreatic islets and acinar cells, respectively.

Purpose of the Study:

  • To investigate the role of connexins (Cx) and cell coupling in pancreatic endocrine and exocrine secretion.
  • To understand the differential expression of connexin isoforms in pancreatic islets and acini and its impact on secretory functions.

Main Methods:

  • Comparative analysis of connexin expression and cell coupling in pancreatic islets and acinar cells.
  • Correlation of connexin changes with secretory function activation and inhibition.

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Main Results:

  • Pancreatic islets and acinar cells exhibit distinct changes in connexin expression and cell coupling in response to secretory function modulation.
  • Pancreatic islets express Cx43, while pancreatic acini express Cx26 and Cx32.
  • These differential connexin expressions correlate with opposite changes in cell coupling during secretory activation/inhibition.

Conclusions:

  • Connexin-made channels play a pivotal role in regulating secretory events in both endocrine and exocrine glands.
  • Differential expression of connexin isoforms is a key factor in controlling specific secretory functions within different gland types, as exemplified by the pancreas.