Pathogenesis of liver cirrhosis

Abstract

Liver cirrhosis is the final pathological result of various chronic liver diseases, and fibrosis is the precursor of cirrhosis. Many types of cells, cytokines and miRNAs are involved in the initiation and progression of liver fibrosis and cirrhosis. Activation of hepatic stellate cells (HSCs) is a pivotal event in fibrosis. Defenestration and capillarization of liver sinusoidal endothelial cells are major contributing factors to hepatic dysfunction in liver cirrhosis. Activated Kupffer cells destroy hepatocytes and stimulate the activation of HSCs. Repeated cycles of apoptosis and regeneration of hepatocytes contribute to pathogenesis of cirrhosis. At the molecular level, many cytokines are involved in mediation of signaling pathways that regulate activation of HSCs and fibrogenesis. Recently, miRNAs as a post-transcriptional regulator have been found to play a key role in fibrosis and cirrhosis. Robust animal models of liver fibrosis and cirrhosis, as well as the recently identified critical cellular and molecular factors involved in the development of liver fibrosis and cirrhosis will facilitate the development of more effective therapeutic approaches for these conditions.

Keywords: Cirrhosis; Pathogenesis; Hepatic stellate cells; Cytokine; miRNA; Animal model; Therapy

Core tip: Cirrhosis is the end-stage condition of many types of chronic liver diseases but the underlying mechanisms are far from being clarified. Multiple cellular and molecular factors might be involved in the initiation and progression of cirrhosis. Activation of hepatic stellate cells is a pivotal event in the development of cirrhosis. Animal models are crucial for understanding the pathogenesis and the development of more efficient therapeutic strategies for cirrhosis, with which cirrhosis may become a treatable or even a reversible disease.