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Connexin 30.2 is expressed in mouse pancreatic beta cells
C Coronel-Cruz1, B Hernández-Tellez, R López-Vancell
1Unidad de Medicina Experimental, Facultad de Medicina, Universidad Nacional Autónoma de México, México, DF 04510, México.
Biochemical and Biophysical Research Communications
|July 9, 2013
Summary
Connexin (Cx) 30.2, previously unknown in pancreatic beta cells, is expressed in both beta cells and vascular endothelial cells. This gap junction protein
Area of Science:
- Endocrinology and Metabolism
- Cell Biology
- Molecular Biology
Background:
- Connexin (Cx) 36 is currently recognized as the primary gap junction protein in pancreatic beta cells.
- The presence and role of other connexins, such as Cx30.2, in pancreatic islets remain largely unexplored.
Purpose of the Study:
- To investigate the expression and localization of connexin (Cx) 30.2 mRNA and protein within mouse pancreatic islets.
- To determine the cellular distribution of Cx30.2 in beta cells and other islet cell types, including vascular endothelial cells.
Main Methods:
- Quantitative reverse transcription polymerase chain reaction (qRT-PCR) to detect Cx30.2 mRNA.
- Western blot analysis to confirm Cx30.2 protein expression.
- Immunohistochemistry and confocal microscopy for cellular and subcellular localization studies, including co-localization with insulin and CD31.
Main Results:
- Cx30.2 mRNA and protein were detected in isolated mouse pancreatic islet preparations.
- Immunohistochemistry revealed Cx30.2 expression in insulin-positive beta cells and co-localization with Cx36 at junctional membranes.
- Cx30.2 was also found in vascular endothelial cells (CD31-positive) and its expression decreased under high glucose conditions.
Conclusions:
- Connexin (Cx) 30.2 is expressed in both pancreatic beta cells and vascular endothelial cells within mouse islets.
- Cx30.2 is present in beta cell cytoplasm and cell membranes, and at junctional sites, potentially interacting with Cx36.
- Glucose levels influence Cx30.2 mRNA expression in pancreatic islets, suggesting a role in glucose-mediated regulation.
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