Choline protects against cardiac hypertrophy induced by increased after-load

Area of Science:

• Cardiovascular Research
• Nutritional Science
• Molecular Cardiology

Background:

• Inadequate choline intake is linked to increased cardiovascular risk.
• The protective role of choline supplementation against cardiac hypertrophy remains unstudied.

Purpose of the Study:

• To investigate the effects of choline supplementation on cardiac hypertrophy.
• To explore the underlying molecular mechanisms of choline's cardioprotective action.

Main Methods:

• Cardiac hypertrophy was induced in mice via transverse aorta constriction (TAC) and in cultured cardiomyocytes using isoproterenol (ISO).
• Choline's effects were assessed using Western blot and real-time PCR to analyze key hypertrophy markers (ANP, BNP, β-MHC) and signaling molecules (miR-133a, Calcineurin).
• The role of muscarinic acetylcholine receptors (mAChR) was investigated using a specific antagonist.

Main Results:

• Choline supplementation significantly attenuated cardiac hypertrophy in mice and cultured cells, reducing heart weight and ventricular thickness.
• Choline administration normalized the expression of cardiac hypertrophy biomarkers.
• Choline restored the expression of the anti-hypertrophic microRNA miR-133a and reduced elevated calcineurin levels, effects blocked by a mAChR antagonist.

Conclusions:

• Choline demonstrates significant cardioprotection against cardiac hypertrophy.
• The mechanism involves the modulation of miR-133a and calcineurin pathways.
• Choline supplementation may serve as an effective adjunct therapy for preventing and treating cardiac hypertrophy.