The hepatic extracellular matrix. I. Components and distribution in normal liver

Area of Science:

• Hepatology
• Vascular Biology
• Extracellular Matrix Research

Background:

• The liver's unique extracellular matrix (ECM) lacks basement membranes (BM) and has minimal ECM, unlike other organs.
• This structure, with fenestrated sinusoidal endothelial cells, facilitates rapid exchange between plasma and hepatocytes.

Discussion:

• During development, hepatocytes signal to endothelial cells, causing fenestrations and BM loss.
• In liver regeneration, hepatocyte growth precedes vascularization, with Ito cells temporarily synthesizing laminin.

Key Insights:

• The liver's attenuated ECM and fenestrated endothelium are crucial for macromolecule exchange.
• Hepatocyte-derived signals modulate endothelial cell phenotype during development and regeneration.

Outlook:

• Understanding the ECM-liver cell interplay is vital for maintaining liver homeostasis.
• Modifications to the hepatic ECM can lead to impaired liver function and disease.