Incomplete Re-Expression of Neuroendocrine Progenitor/Stem Cell Markers is a Key Feature of β-Cell Dedifferentiation

Area of Science:

• Endocrinology
• Cell Biology
• Metabolic Diseases

Background:

• Type 2 diabetes mellitus (T2D) is a global pandemic metabolic disease.
• Increasing evidence suggests beta-cell dedifferentiation (βCD) may contribute to T2D pathogenesis.
• The mechanisms and definition of βCD remain poorly understood.

Purpose of the Study:

• To investigate if a high-glucose in vitro environment mimics in vivo hyperglycemia and induces βCD.
• To establish a cellular model for studying βCD.

Main Methods:

• Utilized the mouse insulinoma 6 (MIN6) pancreatic beta cell line.
• Cultured MIN6 cells in a high-glucose medium over multiple passages.
• Assessed cell viability, insulin secretion, and expression of key beta-cell markers (insulin, Glut2, Pdx1) at RNA and protein levels.

Main Results:

• High-glucose culture did not cause significant cell death but altered insulin secretion profiles.
• Late-passage MIN6 cells showed reduced expression of insulin, glucose transporter 2 (Glut2), and Pdx1.
• Dedifferentiated cells exhibited characteristics of beta-cell precursors and neuroendocrine markers, expressing both glucagon and insulin.

Conclusions:

• High-glucose passaged MIN6 cells provide a valid cellular model for βCD.
• This model can enhance understanding of T2D pathophysiology.
• Findings may facilitate novel therapeutic strategies for T2D.