Insights into pancreatic β cell energy metabolism using rodent β cell models

Area of Science:

• Endocrinology
• Cell Biology
• Metabolic Diseases

Background:

• Mitochondrial diabetes pathogenesis is linked to pancreatic beta-cell failure.
• Beta-cell unique properties are critical in understanding diabetes development.

Purpose of the Study:

• To investigate the impact of energetic stress on beta-cell function.
• To model mechanisms underlying beta-cell mitochondrial dysfunction in diabetes.

Main Methods:

• Two rodent beta-cell models were subjected to reduced glucose conditions to induce energetic stress.
• Cellular respiration, mitochondrial reactive oxygen species (ROS) production, glucose-stimulated insulin secretion (GSIS), and autophagy were assessed.

Main Results:

• Low glucose rapidly decreased whole cell respiration and elevated mitochondrial ROS production in INS-1 cells.
• Altered GSIS profile and impaired mitochondrial function were observed with prolonged low glucose exposure.
• Reduced autophagy was a consequence of sustained energetic stress.

Conclusions:

• Insulinoma cell lines exhibit distinct bioenergetic profiles compared to other cell lines.
• These cell lines serve as valuable models for studying mechanisms affecting beta-cell mitochondrial function.
• Understanding these mechanisms is key to addressing mitochondrial diabetes.