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Desmoglein-2 is important for islet function and β-cell survival.

Kay K Myo Min1, Darling Rojas-Canales2, Daniella Penko3,4

  • 1Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, SA, Australia.

Cell Death & Disease
|October 30, 2022
PubMed
Summary
This summary is machine-generated.

Desmoglein-2 (DSG2) supports pancreatic beta-cells, crucial for insulin production in type 1 diabetes. Loss of DSG2 impairs islet function and increases diabetes susceptibility, highlighting its therapeutic potential.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Immunology

Background:

  • Type 1 diabetes involves autoimmune destruction of pancreatic beta-cells, leading to insulin deficiency.
  • Understanding cell-to-cell interactions within pancreatic islets is vital for managing diabetes.
  • Desmoglein-2 (DSG2) is a cell surface adhesion molecule with an uncharacterized role in pancreatic islets.

Purpose of the Study:

  • To investigate the function of desmoglein-2 (DSG2) in pancreatic beta-cells and its role in type 1 diabetes.
  • To characterize the expression and impact of DSG2 on islet structure and function.
  • To explore DSG2 as a potential therapeutic target for type 1 diabetes.

Main Methods:

  • Analysis of human pancreatic islets and gene expression data.
  • Generation and study of Dsg2 loss-of-function mice (Dsg2lo/lo).
  • Assessment of islet cell mass, insulin production, glucose response, and diabetes susceptibility (streptozotocin model).
  • Beta-cell apoptosis assays and islet transplantation studies.
  • In vitro studies using a murine beta-cell line (Beta-TC-6).

Main Results:

  • DSG2 is highly expressed in human pancreatic islets, specifically by insulin-producing beta-cells.
  • Dsg2lo/lo mice exhibit reduced islet number and size, decreased insulin content, and impaired blood vessel integrity.
  • Dsg2lo/lo islets are more susceptible to cytokine-induced apoptosis and less effective in curing diabetes post-transplantation.
  • DSG2 influences the actin cytoskeleton and cytokine/chemokine release in beta-cells.

Conclusions:

  • DSG2 is a critical, previously unrecognized regulator of pancreatic beta-cell function and islet integrity.
  • DSG2 deficiency exacerbates diabetes phenotypes, including increased susceptibility to hyperglycemia and impaired beta-cell survival.
  • Targeting DSG2 may offer novel therapeutic strategies for type 1 diabetes by preserving beta-cell function and viability.