Induction of cardiomyocyte calcification is dependent on FoxO1/NFATc3/Runx2 signaling

Area of Science:

• Cardiology
• Molecular Biology
• Biochemistry

Background:

• Cardiovascular disorders (CAVDs) are a leading cause of global morbidity and mortality.
• Cardiovascular calcification is a significant aspect of CAVDs, with established mechanisms for vascular and heart valve calcification.
• The molecular mechanisms underlying myocardial and cardiomyocyte calcification remain largely uninvestigated, despite observed calcific deposits in cardiac tissue.

Purpose of the Study:

• To investigate the molecular mechanisms of cardiomyocyte calcification.
• To explore the roles of Forkhead box transcription factor FoxO1 (FoxO1) and nuclear factor of activated T-cells NFATc3 (NFATc3) in cardiomyocyte calcification.

Main Methods:

• Utilized H9c2 cardiomyocytes for experimental studies.
• Applied osteogenic induction for one month to promote calcification.
• Assessed the expression levels of FoxO1, NFATc3, and the osteogenic marker Runx2.

Main Results:

• Calcific deposition was observed in cardiomyocytes after one month of osteogenic induction, but not at 15 days.
• FoxO1 expression was reduced during the calcification process.
• Reduced FoxO1 expression correlated with increased NFATc3 expression, which in turn increased Runx2 expression.

Conclusions:

• Cardiomyocyte calcification involves a reduction in FoxO1 expression, leading to increased NFATc3 and subsequent upregulation of the osteogenic marker Runx2.
• Understanding these molecular pathways is crucial for developing therapeutic strategies for cardiac calcification.