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. 2024 Dec;119(6):1045-1062.
doi: 10.1007/s00395-024-01066-w. Epub 2024 Jul 11.

The attenuated hepatic clearance of propionate increases cardiac oxidative stress in propionic acidemia

Affiliations

The attenuated hepatic clearance of propionate increases cardiac oxidative stress in propionic acidemia

You Wang et al. Basic Res Cardiol. 2024 Dec.

Abstract

Propionic acidemia (PA), arising from PCCA or PCCB variants, manifests as life-threatening cardiomyopathy and arrhythmias, with unclear pathophysiology. In this work, propionyl-CoA metabolism in rodent hearts and human pluripotent stem cell-derived cardiomyocytes was investigated with stable isotope tracing analysis. Surprisingly, gut microbiome-derived propionate rather than the propiogenic amino acids (valine, isoleucine, threonine, and methionine) or odd-chain fatty acids was found to be the primary cardiac propionyl-CoA source. In a Pcca-/-(A138T) mouse model and PA patients, accumulated propionyl-CoA and diminished acyl-CoA synthetase short-chain family member 3 impede hepatic propionate disposal, elevating circulating propionate. Prolonged propionate exposure induced significant oxidative stress in PCCA knockdown HL-1 cells and the hearts of Pcca-/-(A138T) mice. Additionally, Pcca-/-(A138T) mice exhibited mild diastolic dysfunction after the propionate challenge. These findings suggest that elevated circulating propionate may cause oxidative damage and functional impairment in the hearts of patients with PA.

Keywords: Cardiac complication; Human induced pluripotent stem cell-derived cardiomyocytes; Microbiome; Propionate; Propionic acidemia; Stable isotope-based metabolic flux.

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Conflict of interest statement

Declarations. Conflict of interest: The authors have declared that no conflict of interest exists.

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