Metabolic and Mitochondrial Dysfunction in Non-Alcoholic Fatty Liver Disease

Non-alcoholic fatty liver disease (NAFLD) encompasses a spectrum from simple steatosis to steatohepatitis, fibrosis and cirrhosis, driven principally by excess lipid delivery to hepatocytes and impaired fatty acid handling. At the metabolic level, insulin resistance promotes de novo lipogenesis and inhibits lipid export, while chronic overnutrition elevates oxidative stress. Mitochondria, central to hepatic bioenergetics, respond to lipid overload by upregulating β-oxidation and oxidative phosphorylation (OXPHOS). Persistent substrate excess, however, leads to electron-transport chain dysfunction, reactive oxygen species accumulation and eventual collapse of mitochondrial integrity. This in turn exacerbates insulin resistance, disrupts cellular quality control pathways such as autophagy and sensitises hepatocytes to cell death. Emerging evidence points to a dynamic interplay between mitochondrial dynamics, quality control and metabolic signalling—among them AMPK-mediated energy sensing and autophagic clearance—whose dysregulation underpins NAFLD progression. A deeper understanding of these interlinked pathways has revealed novel regulators of mitochondrial homeostasis and potential therapeutic targets to restore metabolic balance in the fatty liver.

Research from Nature Portfolio

Recent studies have identified the mitochondrial fission process 1 protein (MTFP1) as a critical brake on oxidative metabolism in hepatocytes. Liver-specific deletion of Mtfp1 enhances OXPHOS activity and mitochondrial respiration independently of biogenesis, while inhibiting opening of the mitochondrial permeability transition pore. In murine models of high-fat diet–induced steatosis, loss of MTFP1 confers resistance to lipid accumulation, inflammatory signalling and apoptotic damage. These findings position MTFP1 as an unexpected regulator of mitochondrial efficiency and suggest that fine-tuning of fission-associated pathways may offer therapeutic benefit in NAFLD.

Metabolic and Mitochondrial Dysfunction in Non-Alcoholic Fatty Liver Disease publication trend

The graph below shows the total number of articles in metabolic and mitochondrial dysfunction in non-alcoholic fatty liver disease across all publications each year (not limited to Nature Index journals).

Technical terms

Oxidative phosphorylation (OXPHOS): Mitochondrial process coupling electron transport to ATP synthesis, central to hepatocyte energy supply.

Mitochondrial permeability transition pore (mPTP): A regulated channel whose opening leads to loss of membrane potential and can trigger cell death.

Autophagy: Cellular degradation pathway that recycles damaged organelles and macromolecules, essential for mitochondrial quality control.

AMP-activated protein kinase (AMPK): Energy-sensing kinase that promotes catabolic processes and mitochondrial biogenesis under low-energy conditions.

References

1. Nonalcoholic Fatty Liver Disease: Pathogenesis and Therapeutics from a Mitochondria‐Centric Perspective. Oxidative Medicine and Cellular Longevity (2014).
2. Albumosomes formed by cytoplasmic pre-folding albumin maintain mitochondrial homeostasis and inhibit nonalcoholic fatty liver disease. Signal Transduction and Targeted Therapy (2023).
3. Mtfp1 ablation enhances mitochondrial respiration and protects against hepatic steatosis. Nature Communications (2023).
4. Thrap3 promotes nonalcoholic fatty liver disease by suppressing AMPK-mediated autophagy. Experimental & Molecular Medicine (2023).