Antiaging Gene Klotho Attenuates Pancreatic β-Cell Apoptosis in Type 1 Diabetes

Area of Science:

• Endocrinology
• Molecular Biology
• Immunology

Background:

• Apoptosis of insulin-producing beta cells is a primary driver of type 1 diabetes mellitus (T1DM).
• The antiaging gene Klotho is expressed in pancreatic beta cells, suggesting a potential role in diabetes.
• Beta cell dysfunction and death are central to T1DM pathogenesis.

Purpose of the Study:

• To investigate the role of Klotho in protecting pancreatic beta cells from apoptosis in the context of T1DM.
• To elucidate the molecular mechanisms by which Klotho exerts its protective effects on beta cells.
• To evaluate the therapeutic potential of Klotho gene delivery in T1DM models.

Main Methods:

• Utilized streptozotocin (STZ)-induced diabetes and non-obese (NOD) autoimmune diabetes models.
• Examined the effects of Klotho gene deficiency and overexpression in pancreatic beta cells.
• Investigated molecular pathways including FAK, Akt phosphorylation, and caspase 3 cleavage.
• Assessed cell adhesion, insulin storage, glucose tolerance, and immune cell infiltration.

Main Results:

• Klotho deficiency exacerbated STZ-induced diabetes, increasing beta cell apoptosis.
• Beta cell-specific Klotho expression attenuated STZ-induced diabetes and beta cell apoptosis.
• Klotho activated the integrin β1-FAK/Akt pathway, inhibiting caspase 3 cleavage.
• Klotho gene delivery improved glucose tolerance and reduced beta cell apoptosis in NOD mice, potentially by reducing T-cell infiltration.

Conclusions:

• Klotho protects pancreatic beta cells from apoptosis in T1DM through the integrin β1-FAK/Akt pathway.
• Klotho gene delivery demonstrates therapeutic potential for T1DM by preserving beta cell function and reducing inflammation.
• This study establishes Klotho as a novel protective factor for beta cells in T1DM.