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Doc2b Protects β-Cells Against Inflammatory Damage and Enhances Function
Arianne Aslamy1,2, Eunjin Oh1, Erika M Olson1
1Department of Molecular and Cellular Endocrinology, Diabetes and Metabolic Research Institute, Beckman Research Institute of City of Hope, Duarte, CA.
Diabetes
|April 18, 2018
Summary
Double C2 domain-containing protein β (Doc2b) protects pancreatic beta cells. Doc2b enrichment enhances insulin secretion and prevents cell death, offering a potential therapeutic strategy for type 1 diabetes.
Area of Science:
- Endocrinology
- Cell Biology
- Diabetes Research
Background:
- Loss of functional beta-cell mass is central to type 1 diabetes.
- Beta-cell insulin release relies on SNARE complexes and regulatory proteins like Doc2b.
Purpose of the Study:
- To investigate the role of Doc2b in regulating beta-cell mass and function.
- To determine if Doc2b deficiency or overexpression impacts diabetes susceptibility.
Main Methods:
- Utilized Doc2b+/- knockout and beta-cell-specific Doc2b-overexpressing transgenic mice.
- Administered multiple low-dose streptozotocin (MLD-STZ) to induce diabetes.
- Assessed glucose tolerance, insulin secretion, beta-cell apoptosis, and SNARE complex activation.
Main Results:
- Doc2b deficiency exacerbated MLD-STZ-induced diabetes, increasing beta-cell apoptosis and reducing beta-cell mass.
- Doc2b overexpression improved glucose tolerance and protected against MLD-STZ-induced diabetes.
- Doc2b enrichment enhanced glucose-stimulated insulin secretion (GSIS) and SNARE activation, while preventing apoptosis.
Conclusions:
- Doc2b plays a critical role in maintaining beta-cell function and mass.
- Doc2b enrichment protects beta-cells from diabetogenic and proapoptotic stress.
- A Doc2b peptide fragment demonstrates therapeutic potential for preserving beta-cell mass.
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