RRAD-reduction reveals efficacy of targeting L-type calcium channel regulation for treatment of heart failure.

ABSTRACT:

Aims

Heart failure with reduced ejection fraction (HFrEF) is a major health problem. Increasing L-type calcium channel (LTCC) activity deteriorates heart function; however, myocardial RRAD knockout (cRADΔ/Δ) instills tonic modulated LTCC current (ICa,L) that preserves healthy myocardium. Thus, we chose to challenge the dogma that enhanced trigger Ca2+ is maladaptive. The study objective was to test the hypothesis that modulated ICa,L in cRADΔ/Δ mice rescues dilated cardiomyopathy by providing tonic modulated trigger Ca2+.

Methods and results

Mouse and human models were tested. The muscle lim protein knockout mouse (MLPKO) is a murine model of dilated cardiomyopathy (DCM) and HFrEF. The experimental timeline was to induce cRADΔ/Δ after onset of DCM (2.5 months of age) and fol

SUBMITTER: Elmore G 

PROVIDER: S-EPMC12638741 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature