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Neddylation inhibition extends lifespan and preserves cardiac function during aging via mitophagy

ABSTRACT: Age-related cardiac dysfunction is closely linked to impaired mitophagy and mitochondrial quality control. Here, we identify neddylation inhibition as a previously unrecognized strategy to activate mitophagy and improve cardiac function during aging. Using high-content screening of ~10,000 compounds, we uncovered MLN4924, a clinically advanced neddylation inhibitor, as a potent inducer of mitophagy across diverse systems. MLN4924 enhanced mitophagic flux in human iPSC-derived cardiomyocytes and mouse hearts via a non-canonical pathway that bypasses PINK1/Parkin and mitochondrial fission. Mechanistically, MLN4924 stabilized HIF1α by disrupting CUL2-mediated degradation, leading to upregulation of the mitophagy receptor BNIP3. In aged mice, late-life MLN4924 treatment restored cardiac mitophagy, reversed ventricular hypertrophy, and improved diastolic function. MLN4924 also extended lifespan in C. elegans, underscoring the systemic benefit of neddylation blockade. These findings establish neddylation as a druggable regulator of mitochondrial quality control and aging, offering a potential therapeutic framework to combat age-related cardiac decline.

ORGANISM(S): Mus musculus

PROVIDER: GSE317599 | GEO | 2026/02/01

REPOSITORIES: GEO

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Project description:The heart undergoes significant structural, metabolic, gene expression and functional alterations during the perinatal to postnatal transition. While recent studies have identified multiple epigenetic and transcriptional regulators of cardiac maturation, post-transcriptional mechanisms regulating this process remain poorly understood. Neddylation is a post-translational modification that conjugates a small ubiquitin-like protein, NEDD8, to protein substrates via an E1-E2-E3 enzymatic cascade. The goal of this study was to define the role of neddylation in perinatal cardiac development and cardiac maturation. Neddylation was inhibited in adult mouse hearts by cardiac-specific deletion of NAE1 gene, a regulatory subunit of NEDD8 E1 enzyme, or in neonatal cardiomyocytes (CMs) with a pharmacological neddylation inhibitor, MLN4924. The impact on cardiac transcriptome, metabolism, maturation and function was assessed. Mosaic deletion of NAE1 in ~40% neonatal CMs disrupted aspects of maturation, including transverse-tubule formation, cellular hypertrophy and fetal/adult isoform switching, whereas deletion of NAE1 in over 80% CMs led to rapid development of cardiomyopathy and heart failure. Transcriptome analysis demonstrated an association of metabolic derangement with immature cardiomyocyte signature. Biochemical, ultrastructural and metabolomics analyses confirmed downregulation of fatty acid and oxidative phosphorylation genes, deficits in fatty acid utilization, mitochondrial dysfunction, and significantly altered metabolic profiles in NAE1-deficient hearts or MLN4924-treated neonatal CMs. Mechanistically, we found that HIF1α, a transcription factor known to promote glycolysis and suppress oxidative metabolism, is a putative NEDD8 target. Inhibition of neddylation resulted in HIF1α accumulation and activation, which contributed to diminished fatty acid utilization. Taken together, we conclude that neddylation plays a crucial role in CM maturation and postnatal cardiac development through sustaining the glycolytic to oxidative metabolic switch in perinatal hearts.

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Neddylation inhibition extends lifespan and preserves cardiac function during aging via mitophagy

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