Mechanisms of Inflammatory Liver Injury

Inflammatory liver injury arises when hepatocytes are damaged by infectious agents, drugs or metabolic stress, leading to the release of danger signals that engage resident immune cells. Liver-resident macrophages, known as Kupffer cells, detect pathogen-associated and damage-associated molecular patterns via pattern recognition receptors, activating intracellular cascades such as NF-κB and mitogen-activated protein kinases. These pathways drive the production of pro-inflammatory cytokines and chemokines, which in turn recruit circulating monocytes that differentiate into inflammatory macrophages. Oxidative stress, endoplasmic reticulum dysfunction and mitochondrial perturbation further amplify tissue damage, tipping the balance between cell survival and programmed death. Counter-regulatory mechanisms—including antioxidant responses governed by Nrf2 and autophagy—modulate the extent of injury, offering targets for therapeutic intervention.

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Mechanisms of Inflammatory Liver Injury publication trend

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

Technical terms

Kupffer cell: A specialised macrophage residing in liver sinusoids that initiates and regulates hepatic immune responses.

Monocyte: A circulating white blood cell that infiltrates injured tissue and differentiates into macrophages or dendritic cells.

NF-κB: A transcription factor central to the expression of pro-inflammatory cytokines and survival genes.

HO-1: Heme oxygenase-1, an inducible enzyme that degrades haem to biliverdin, exerting cytoprotective antioxidant effects.

PAMP: Pathogen-associated molecular pattern, a conserved microbial motif recognised by innate immune receptors.

DAMP: Damage-associated molecular pattern, an endogenous molecule released by stressed or necrotic cells that triggers inflammation.

References

1. BRISC is required for optimal activation of NF-κB in Kupffer cells induced by LPS and contributes to acute liver injury. Cell Death & Disease (2023).
2. Mangiferin Attenuates LPS/D-GalN-Induced Acute Liver Injury by Promoting HO-1 in Kupffer Cells. Frontiers in Immunology (2020).
3. Functional Role of Monocytes and Macrophages for the Inflammatory Response in Acute Liver Injury. Frontiers in Physiology (2012).
4. Nrf2 signaling and autophagy are complementary in protecting lipopolysaccharide/d-galactosamine-induced acute liver injury by licochalcone A. Cell Death & Disease (2019).