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Adequate connexin-mediated coupling is required for proper insulin production
C Vozzi1, S Ullrich, A Charollais
1Department of Morphology, University of Geneva Medical School, Switzerland.
The Journal of Cell Biology
|December 1, 1995
Summary
Connexin 43 (Cx43) gap junctions are crucial for insulin production. Adequate Cx43 coupling in pancreatic beta-cells enhances insulin gene expression and storage, vital for normal insulin secretion.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- Connexins (Cx) form gap junctions, facilitating intercellular communication.
- The role of connexins in insulin secretion and production is not fully understood.
Purpose of the Study:
- To investigate the contribution of connexin expression to insulin secretion.
- To determine the relationship between connexins, gap junctions, and coupling in insulin-producing cells.
Main Methods:
- Investigated connexin expression, gap junctions, and coupling in normal and tumoral insulin-producing cells.
- Utilized stable transfection of Cx43 cDNA to correct defects in Cx43 expression.
- Quantified insulin gene expression and insulin content.
Main Results:
- Normal pancreatic islet cells and a rat insulinoma exhibited functional coupling via Cx43 gap junctions.
- Abnormally secreting insulin cell lines lacked Cx43 expression, gap junctions, and coupling.
- Stable Cx43 transfection in deficient cells, at levels similar to native beta-cells, markedly elevated insulin gene expression and content compared to wild-type and overexpressing cells.
Conclusions:
- Adequate levels of connexin-mediated coupling are essential for proper insulin production and storage.
- Cx43 expression and functional gap junctions play a critical role in regulating insulin biosynthesis and content in pancreatic beta-cells.