Peroxisomal catalase and plasmalogen biosynthesis protect from oxidative stress in Barth syndrome cardiomyopathy

To investigate the role of peroxisomal catalase and plasmalogen synthesis in mitigating oxidative stress in Barth syndrome-related cardiomyopathy.

Study Models: Utilized Taz-KD mice and human induced pluripotent stem cell-derived cardiac myocytes (iPSC-CM) from Barth syndrome patients to analyze mitochondrial and metabolic dysfunction.
Metabolic Compensation: Examined metabolic flux rewiring towards glucose and glutamate uptake, mediated by the integrated stress response (ISR) and ATF4 induction.
Peroxisomal Function: Explored the role of peroxisomes in fatty acid metabolism, redox control, and their interaction with mitochondria.

Taz-deficiency leads to altered lipid composition in the inner mitochondrial membrane, affecting energy conversion.
Mitochondrial Ca2+ uniporter (MCU) deficiency in Taz-KD hearts compromises redox regulation.
Metabolic compensation through increased glucose and glutamate uptake enhances anti-oxidative capacity.
Peroxisomes play a crucial role in detoxifying H2O2 and are interdependent with mitochondrial function.

The study examines the interplay between mitochondrial dysfunction and peroxisomal activity in Barth syndrome.

The exact compensatory mechanisms preventing oxidative stress in BTHS cardiomyopathy are not fully elucidated.
Further investigation is required to clarify the relationship between peroxisomal and mitochondrial functions.

The roles of peroxisomal catalase and plasmalogen synthesis in Barth syndrome-related cardiomyopathy warrant further exploration.