Characterization of chronic HCV infection-induced apoptosis

Area of Science:

• Hepatology
• Virology
• Immunology

Background:

• Hepatocellular carcinoma (HCC) is linked to chronic hepatitis C virus (HCV) infection.
• Apoptotic pathways and immune evasion are not fully understood in HCV-associated HCC and chronic hepatitis (CH).

Purpose of the Study:

• Investigate apoptotic and anti-apoptotic gene expression in HCV-associated HCC and CH.
• Analyze HCV's modulation of apoptosis in HepG2 cells and clinical samples.

Main Methods:

• Assessed viral replication using RT-PCR and qRT-PCR.
• Measured apoptotic gene (Fas, FasL, Bcl-2, Bcl-xL, Bak) and caspase expression via immunohistochemistry, RT-PCR, and colorimetric assays.
• Confirmed findings in cell lines and clinical samples from HCC and CH patients.

Main Results:

• Apoptotic activity increased initially post-HCV infection, then decreased.
• Significant concordance was found between in vitro and in situ gene expression changes (p < 0.05).
• HCV infection modulated Fas, FasL, and other apoptotic proteins early, indicating viral control over intracellular apoptotic signals.

Conclusions:

• Chronic HCV infection differentially modulates apoptosis during infection.
• HCV induces apoptosis early, with modulation occurring as the disease progresses.
• Findings offer insights into apoptosis signaling and potential targeted therapies for viral persistence and HCC.