Ferroptosis contributes to catecholamine-induced cardiotoxicity and pathological remodeling

Area of Science:

• Cardiovascular Biology
• Cell Death Mechanisms
• Biochemistry

Background:

• High circulating catecholamines are linked to cardiac injury, remodeling, and heart failure.
• The precise molecular mechanisms driving catecholamine-induced cardiotoxicity remain incompletely understood.

Purpose of the Study:

• To investigate the role of ferroptosis in catecholamine-induced cardiotoxicity.
• To elucidate the signaling pathways involved in catecholamine-induced ferroptosis in cardiomyocytes.

Main Methods:

• In vitro studies using cardiomyocytes exposed to isoproterenol.
• In vivo studies in animal models with isoproterenol administration.
• Assessment of glutathione levels, GPX4 activity, lipid peroxidation, iron accumulation, and ROS production.
• Pharmacological inhibition of ferroptosis (ferrostatin-1) and HO-1 (ZnPP).

Main Results:

• Isoproterenol induced ferroptosis in cardiomyocytes by depleting glutathione and degrading GPX4, increasing lipid peroxidation.
• Isoproterenol upregulated heme oxygenase 1 (HO-1) via Bach1 downregulation, leading to iron accumulation.
• Mitochondrial iron and ROS accumulation were critical for isoproterenol-induced ferroptosis.
• Inhibition of ferroptosis or HO-1 activity ameliorated isoproterenol-induced cardiac damage and heart failure.

Conclusions:

• Catecholamine stimulation induces ferroptotic cell death in cardiomyocytes through GPX4 and Bach1-HO-1 dependent pathways.
• Targeting ferroptosis presents a potential therapeutic strategy for catecholamine-induced myocardial injury and heart failure.