Macrophage Phenotype and Function in Liver Disorder

Area of Science:

• Immunology
• Hepatology
• Cell Biology

Background:

• Hepatic macrophages are heterogeneous, comprising resident Kupffer cells (KCs) and recruited macrophages from the peritoneum and bone marrow.
• KCs maintain liver homeostasis by scavenging microbes, while recruited macrophages contribute to liver injury and disease progression.
• These macrophages exhibit plasticity, altering phenotypes and functions during disease development.

Purpose of the Study:

• To review the distinct roles of tissue-resident and recruited hepatic macrophages in liver disease pathogenesis.
• To explore the involvement of hepatic macrophages in Alcoholic Liver Disease (ALD), Non-Alcoholic Steatohepatitis (NASH), viral hepatitis, and Hepatocellular Carcinoma (HCC).

Main Methods:

• Literature review summarizing current knowledge on hepatic macrophage populations.
• Analysis of studies investigating macrophage accumulation and function in various liver pathologies.

Main Results:

• Hepatic macrophages are implicated in the initiation and progression of diverse liver diseases.
• They function as tolerogenic antigen-presenting cells, modulating T-cell responses and inflammation.
• Macrophages release factors promoting tissue repair and regeneration, but can also contribute to disease pathology.

Conclusions:

• Both Kupffer cells and recruited macrophages have distinct, yet crucial, roles in liver disease development.
• Understanding macrophage plasticity is key to comprehending their dynamic involvement in liver pathogenesis.
• Targeting hepatic macrophages may offer therapeutic strategies for liver diseases.