Lipotoxicity and Hepatic Injury Mechanisms

Lipotoxicity arises when hepatocytes accumulate excess free fatty acids or toxic lipid species beyond their capacity for safe storage, precipitating a cascade of cellular stresses that culminate in liver injury. At the cellular level, saturated fatty acids disrupt membrane composition and fluidity, provoke endoplasmic reticulum stress and mitochondrial dysfunction, and generate reactive oxygen species. These events trigger adaptive and maladaptive signalling pathways, including activation of stress‐kinase cascades, unfolded protein response, inflammasome assembly and regulated cell-death programmes such as apoptosis, necroptosis and pyroptosis. In the liver, chronic lipotoxic insults drive steatosis to non-alcoholic steatohepatitis, fibrosis and ultimately cirrhosis. Non-parenchymal cells amplify tissue damage through release of proinflammatory cytokines and recruitment of immune effectors. Over the past decade, mechanistic insights have highlighted key molecular nodes—such as stearoyl-CoA desaturase-1 regulation of lipid partitioning, mixed-lineage kinase 3–c‐Jun N-terminal kinase signalling and death-receptor pathways—that orchestrate lipoapoptosis and sterile inflammation. Improved understanding of these interconnected processes emphasises the global burden of metabolic liver disease and underpins the development of targeted therapeutic strategies to restore lipid homeostasis and prevent progression to end-stage liver failure.

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Lipotoxicity and Hepatic Injury Mechanisms publication trend

The graph below shows the total number of articles in lipotoxicity and hepatic injury mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Lipotoxicity: Cellular dysfunction and death caused by accumulation of toxic lipid species in non-adipose tissues.

Endoplasmic reticulum stress: Perturbation of protein folding within the ER lumen, leading to activation of the unfolded protein response.

Necroptosis: Programmed necrotic cell death mediated by receptor-interacting protein kinases and mixed-lineage kinase domain-like protein.

Pyroptosis: Inflammatory form of programmed cell death characterised by inflammasome activation, gasdermin D pore formation and cytokine release.

Liver organoid: Three-dimensional multicellular culture system that recapitulates key aspects of hepatic tissue architecture and function for in vitro disease modelling.

References

1. The oleic/palmitic acid imbalance in exosomes isolated from NAFLD patients induces necroptosis of liver cells via the elongase-6/RIP-1 pathway. Cell Death & Disease (2023).
2. Single‐cell transcriptomics stratifies organoid models of metabolic dysfunction‐associated steatotic liver disease. The EMBO Journal (2023).
3. Lipotoxic lethal and sublethal stress signaling in hepatocytes: relevance to NASH pathogenesis[S]. Journal of Lipid Research (2016).
4. Hepatic Lipid Partitioning and Liver Damage in Nonalcoholic Fatty Liver Disease ROLE OF STEAROYL-CoA DESATURASE*. Journal of Biological Chemistry (2009).
5. Death Receptor 5 Signaling Promotes Hepatocyte Lipoapoptosis*. Journal of Biological Chemistry (2011).
6. Lipotoxicity in the liver. World Journal of Hepatology (2013).