Glycaemic variability underlies myocyte dysfunction and myocardial injury risk in diabetes

Area of Science:

• Cardiology
• Endocrinology
• Genetics

Background:

• Heart disease is a major cause of death in diabetes patients, often linked to ischemic injuries like myocardial infarction (MI).
• Existing cardiovascular disease risk biomarkers, including hyperglycemia measures, do not fully explain the elevated post-MI mortality risk in diabetic individuals.

Purpose of the Study:

• To systematically evaluate the role of glycemic stress in cardiovascular risk within the context of diabetes.
• To investigate whether glycemic variability or sustained hyperglycemia is a primary driver of cardiac dysfunction and injury in diabetes.

Main Methods:

• Utilized human population genetic data.
• Conducted in vivo studies using adult male mice.
• Employed in vitro models.
• Analyzed patient plasma assays.

Main Results:

• Demonstrated that glycemic variability, more than sustained hyperglycemia, is a key risk factor for cardiomyocyte dysfunction and myocardial injury in diabetes.
• Showed that patient plasma assays can predict the contribution of glycemic variability to cardiomyocyte dysfunction and subclinical cardiac injury.

Conclusions:

• Glycemic variability is a critical, previously underestimated risk factor for cardiac complications in diabetes.
• Findings provide preclinical models for further research and drug discovery.
• Results inform improved strategies for managing cardiovascular outcomes in diabetic patients.