Beyond Leptin and Adiponectin: The Diverse Roles of Adipokines in the Myocardial Hypertrophic Process and Heart Failure and their Potential Contribution in Obesity

It is now widely recognized that adipocytes have the ability to produce a myriad of bioactive compounds released into the circulation and affecting distal organs including the heart. These factors, termed adipokines, are also produced by various tissues in addition to adipocytes including cardiac tissue and have the ability to modulate cardiac function and the response to pathology. Among the processes greatly affected by adipokines is myocardial remodelling due to hypertrophy and fibrosis, two processes which contribute to the development of heart failure. This is particularly relevant under conditions of obesity and the accompanied increased adiposity in general resulting in increased adipokine production. The effects of adipokines on cardiac remodelling can be both beneficial or adverse, depending on adipokine type such as adiponectin and leptin, respectively. The molecular bases underlying the effects of adipokines on myocardial remodelling have been extensively studied and likely involved a multiplicity of cell signalling processes thus demonstrating substantial complexity. Emerging evidence suggests that these proteins play an important role in cardiac pathology. Their precise contribution is yet to be determined with certainly as this likely reflects a balance between pro-remodelling and anti-remodelling factors.