CXXC4 mediates glucose-induced β-cell proliferation.

Area of Science:

• Endocrinology
• Molecular Biology
• Cancer Research

Background:

• CXXC finger protein 4 (CXXC4) negatively regulates the Wnt/β-catenin pathway and influences cancer cell proliferation.
• The role of CXXC4 in glucose-stimulated pancreatic beta-cell proliferation remains unclear.

Purpose of the Study:

• To investigate the involvement of CXXC4 in glucose-induced beta-cell proliferation.
• To elucidate the underlying molecular mechanisms of CXXC4's function in beta-cells.

Main Methods:

• Assessed CXXC4 expression in rat models and cell/islet cultures under high glucose conditions.
• Utilized adenovirus-mediated CXXC4 overexpression in INS-1 cells and primary islets.
• Evaluated beta-cell proliferation using CCK-8 and EdU assays, cell cycle analysis, and Western blotting for Wnt signaling pathway components.

Main Results:

• High glucose significantly decreased CXXC4 mRNA levels in islets and beta-cells.
• Overexpression of CXXC4 inhibited high glucose-induced beta-cell proliferation in vitro.
• CXXC4 overexpression suppressed Wnt signaling and reduced cyclin D2 expression.

Conclusions:

• Glucose negatively regulates CXXC4 expression, thereby promoting pancreatic beta-cell proliferation.
• CXXC4 acts as an inhibitor of beta-cell proliferation in response to high glucose via Wnt signaling.
• Findings identify CXXC4 as a potential therapeutic target for diabetes management.