Single-Cell RNA Sequencing Shows Exercise Protects db/db Mouse Pancreatic Injuries by Regulating Endothelial Cell...

Area of Science:

• Endocrinology
• Cell Biology
• Metabolic Disease Research

Background:

• Type 2 diabetes mellitus (T2DM) prevalence is rising globally.
• The pancreas is crucial in T2DM, and exercise is a key non-pharmacological treatment.
• Existing research on exercise and T2DM primarily focuses on pancreatic beta cells, neglecting other cell types.

Purpose of the Study:

• To investigate the effects of exercise on diverse pancreatic cell types beyond beta cells.
• To comprehensively analyze how exercise protects and enhances pancreatic function in T2DM.
• To identify specific pancreatic cell types and mechanisms involved in exercise's protective effects.

Main Methods:

• Utilized 6-week-old male db/db mice, a model for T2DM.
• Implemented a 10-week treadmill exercise regimen (9 m/min, 50 min/day, 5 days/week).
• Employed single-cell RNA sequencing (scRNA-seq) for detailed pancreatic cell analysis.

Main Results:

• Exercise training improved body weight and pancreatic profiles in db/db mice.
• scRNA-seq identified 12 pancreatic cell types, with significant alterations in endothelial cells (ECs).
• Subtype analysis revealed notable differences in capillary ECs and unknown EC 1, linked to proliferation and injury response, respectively.

Conclusions:

• Exercise benefits pancreatic health in T2DM by influencing various cell types, particularly endothelial cells.
• Capillary ECs and unknown EC 1 subtypes show distinct responses to exercise, suggesting roles in pancreatic protection.
• These findings highlight novel mechanisms of exercise's therapeutic effects in T2DM, focusing on pancreatic endothelial cell function.