Angiogenesis and experimental hepatic fibrosis

Area of Science:

• Hepatology
• Vascular Biology
• Pathology

Background:

• Angiogenesis is crucial for granulation tissue repair and often precedes fibrosis in chronic liver diseases.
• Understanding angiogenesis in hepatic insults is vital for comprehending liver disease progression.

Purpose of the Study:

• To investigate the presence, development, and characteristics of angiogenesis in common experimental models of hepatic fibrosis.
• To analyze cellular components, vascular structures, extracellular matrix, and associated molecular factors in these models.

Main Methods:

• Examined five experimental models of liver fibrosis: Capillaria hepatica, pig serum, carbon tetrachloride, bile duct ligation (rats), and Schistosoma mansoni infection (mice).
• Characterized cells, vessels, extracellular matrix, and investigated factors like factor VIII RA, vascular basement membrane, actin, elastin, and vascular-endothelial growth factor.

Main Results:

• All investigated models demonstrated significant angiogenesis.
• A strong correlation between angiogenesis and fibrosis was observed, particularly in the Capillaria hepatica model.
• Pericytes were noted to detach and transform into myofibroblasts, highlighting angiogenesis's role in fibrosis development.

Conclusions:

• Angiogenesis is a prominent feature in diverse models of experimental liver fibrosis.
• The transformation of pericytes into myofibroblasts underscores the critical role of angiogenesis in the pathogenesis of liver fibrosis.