Ecto-5'-nucleotidase deficiency exacerbates pressure-overload-induced left ventricular hypertrophy and dysfunction

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Cardiac Physiology

Background:

• Chronic systolic overload leads to maladaptive cardiac remodeling and heart failure.
• Extracellular adenosine signaling plays a role in cardiovascular homeostasis.
• The enzyme CD73 is a key producer of extracellular adenosine.

Purpose of the Study:

• To investigate the role of endogenous extracellular adenosine in the adaptive cardiac response to chronic systolic overload.
• To determine if CD73-mediated adenosine production protects against pressure-overload-induced heart failure.

Main Methods:

• Transverse aortic constriction (TAC) was performed on CD73-deficient (KO) and wild-type (WT) mice.
• Cardiac function, hypertrophy, fibrosis, and molecular signaling pathways were assessed.
• In vitro studies using cultured cardiomyocytes and fibroblasts were conducted.

Main Results:

• CD73-KO mice exhibited exacerbated cardiac hypertrophy, dilation, and dysfunction after TAC compared to WT mice.
• KO mice showed increased myocardial fibrosis and cardiomyocyte hypertrophy post-TAC.
• Adenosine treatment and a 2-chloro-adenosine analogue reduced cardiomyocyte hypertrophy and associated signaling pathways in vitro.

Conclusions:

• CD73-mediated extracellular adenosine production is crucial for preserving cardiac function during chronic systolic overload.
• Adenosine signaling prevents maladaptive cardiac remodeling, including hypertrophy and fibrosis.
• Targeting the CD73-adenosine pathway may offer therapeutic strategies for heart failure.