Metabolic Coordination Structures Contribute to Diabetic Myocardial Dysfunction

Area of Science:

• Cardiology
• Metabolic Disorders
• Molecular Biology

Background:

• Diabetes mellitus is a significant risk factor for cardiac dysfunction and heart failure.
• Diabetic cardiomyopathy involves metabolic disturbances and structural remodeling of the heart.
• The interplay between metabolic and structural changes in diabetic heart disease remains poorly understood.

Purpose of the Study:

• To investigate the role of acyl-coenzyme A-binding protein (ACBP) in the metabolic and structural coupling of diabetic cardiac dysfunction.
• To elucidate the underlying mechanisms by which ACBP influences cardiac structure and function in type 2 diabetes.

Main Methods:

• Utilized mouse models of type 2 diabetes (T2DM) to analyze cardiac metabolism and structure.
• Screened public datasets to identify ACBP as a potential mediator of T2DM-associated heart disease.
• Employed in vivo loss-of-function and gain-of-function studies, metabolomics, co-immunoprecipitation, and ChIP sequencing to investigate ACBP's role and mechanisms.

Main Results:

• Diabetic hearts showed altered lipid metabolism, impaired ultrastructure, and systolic/diastolic dysfunction.
• ACBP expression was upregulated in diabetic hearts and associated with disease severity.
• ACBP knockout attenuated T2DM-induced cardiac remodeling and dysfunction, while overexpression exacerbated it.
• ACBP was found to interact with MyBPC3, potentially impairing myocardial contraction, and its transcription is regulated by PPARγ.

Conclusions:

• ACBP plays a critical role in the bidirectional regulation of cardiomyocyte metabolism and structure in T2DM.
• ACBP represents a potential therapeutic target for mitigating cardiac dysfunction in diabetic patients.