Immune Dysfunction and Infection Risk in Advanced Liver Disease

Area of Science:

• Hepatology
• Immunology
• Microbiology

Background:

• Advanced liver disease, including cirrhosis and alcohol-associated hepatitis, significantly elevates the risk of microbial infections.
• These infections can trigger decompensation and mortality, particularly in acute-on-chronic liver failure.
• Severe immune dysfunction, termed 'immune paralysis,' is linked to high short-term mortality in these patients.

Purpose of the Study:

• To review the evidence linking immune dysfunction to microbial infections in advanced liver disease.
• To explore the pathogenic mechanisms underlying immune dysfunction in cirrhosis and alcohol-associated liver disease.
• To identify potential therapeutic targets for intervention.

Main Methods:

• Literature review of existing evidence.
• Analysis of pathogenic mechanisms of immune dysfunction.
• Focus on cirrhosis and alcohol-associated liver disease.

Main Results:

• Advanced liver disease disrupts the liver's role in regulating systemic immunity and protecting against gut-derived microbial products.
• Loss of gut barrier integrity allows microbial translocation, leading to immune cell defects and promoting infection.
• Immune cells in cirrhosis and severe alcoholic hepatitis lose their ability to balance immune tolerance and activation.

Conclusions:

• Immune dysfunction is a critical factor predisposing patients with advanced liver disease to microbial infections.
• Understanding the complex interplay between the gut, liver, and immune system is key.
• Further research into these mechanisms may reveal novel therapeutic strategies.