Intrahepatic NK cells function suppressed in advanced liver fibrosis

Area of Science:

• Immunology
• Hepatology
• Oncology

Background:

• Hepatitis B virus-related liver fibrosis (HBV-LF), especially cirrhosis, is a major risk factor for liver cancer.
• Mechanisms of fibrosis persistence and liver cancer pathogenesis in HBV-LF remain unclear.
• Limited research exists on natural killer (NK) cell status during HBV-LF progression.

Purpose of the Study:

• To investigate the phenotype and function of NK cells in patients with varying stages of HBV-LF.
• To explore the role of NK cells in the progression of liver fibrosis and the development of hepatocellular carcinoma (HCC).

Main Methods:

• Simultaneous collection of liver tissue and peripheral blood from 32 HBV-infected HCC patients.
• Analysis of NK cell quantity, phenotype, and function using flow cytometry.

Main Results:

• No significant difference in circulating or intrahepatic NK cell numbers between early and advanced HBV-LF.
• Reduced NKp46 expression on intrahepatic NK cells in advanced HBV-LF.
• Decreased production of IFN-γ and perforin by intrahepatic NK cells in advanced HBV-LF.

Conclusions:

• Advanced HBV-LF is associated with distinct suppression of intrahepatic NK cell immune function.
• Reduced NKp46 expression and impaired cytokine/cytokine production by NK cells are key findings.
• These results offer new insights into NK cell involvement in HBV-LF persistence and HCC development.