Metabolic Rescue Ameliorates Mitochondrial Encephalo-cardiomyopathy in Murine and Human IPSC Models of Leigh Syndrome

Overview

Journal Clin Transl Med

Publisher Wiley

Specialty General Medicine

Date 2022 Jul 25

PMID 35872650

Authors

Jin-Young Yoon

Nastaran Daneshgar

Yi Chu

Biyi Chen

Marco Hefti

Ajit Vikram

Kaikobad Irani

Long-Sheng Song

Charles Brenner

E Dale Abel

Barry London

Dao-Fu Dai

Affiliations

Soon will be listed here.

Abstract

Background: Mice with deletion of complex I subunit Ndufs4 develop mitochondrial encephalomyopathy resembling Leigh syndrome (LS). The metabolic derangement and underlying mechanisms of cardio-encephalomyopathy in LS remains incompletely understood.

Methods: We performed echocardiography, electrophysiology, confocal microscopy, metabolic and molecular/morphometric analysis of the mice lacking Ndufs4. HEK293 cells, human iPS cells-derived cardiomyocytes and neurons were used to determine the mechanistic role of mitochondrial complex I deficiency.

Results: LS mice develop severe cardiac bradyarrhythmia and diastolic dysfunction. Human-induced pluripotent stem cell-derived cardiomyocytes (iPS-CMs) with Ndufs4 deletion recapitulate LS cardiomyopathy. Mechanistically, we demonstrate a direct link between complex I deficiency, decreased intracellular (nicotinamide adenine dinucleotide) NAD /NADH and bradyarrhythmia, mediated by hyperacetylation of the cardiac sodium channel Na 1.5, particularly at K1479 site. Neuronal apoptosis in the cerebellar and midbrain regions in LS mice was associated with hyperacetylation of p53 and activation of microglia. Targeted metabolomics revealed increases in several amino acids and citric acid cycle intermediates, likely due to impairment of NAD -dependent dehydrogenases, and a substantial decrease in reduced Glutathione (GSH). Metabolic rescue by nicotinamide riboside (NR) supplementation increased intracellular NAD / NADH, restored metabolic derangement, reversed protein hyperacetylation through NAD -dependent Sirtuin deacetylase, and ameliorated cardiomyopathic phenotypes, concomitant with improvement of Na 1.5 current and SERCA2a function measured by Ca2 -transients. NR also attenuated neuronal apoptosis and microglial activation in the LS brain and human iPS-derived neurons with Ndufs4 deletion.

Conclusions: Our study reveals direct mechanistic explanations of the observed cardiac bradyarrhythmia, diastolic dysfunction and neuronal apoptosis in mouse and human induced pluripotent stem cells (iPSC) models of LS.

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