Adaptive immune response during hepatitis C virus infection

Area of Science:

• Hepatology
• Immunology
• Virology

Background:

• Hepatitis C virus (HCV) infects 170 million globally, causing liver cirrhosis and cancer.
• HCV is a hepatotropic, non-cytopathic virus that establishes persistent infections by evading immune control.
• Liver damage in HCV infection results from viral and host factors, with adaptive immunity crucial for control.

Purpose of the Study:

• To review the critical role of the adaptive immune response in controlling Hepatitis C virus (HCV) infection.
• To elucidate the multifaceted mechanisms employed by HCV to evade adaptive immune surveillance and control.

Main Methods:

• This is a review article, synthesizing existing research on HCV immunology.
• Analysis of viral evasion strategies targeting adaptive immune cells (T cells, B cells).
• Examination of host factors influencing disease progression and immune response modulation.

Main Results:

• HCV employs escape mutations in viral epitopes, hindering antibody neutralization and T cell recognition.
• HCV induces T cell anergy and deletion, diminishing the pool of effective antiviral T cells.
• HCV disrupts T cell regulation, affecting T helper and regulatory T cell balance and co-stimulatory molecule expression.

Conclusions:

• The adaptive immune response is vital for controlling HCV, but the virus has evolved sophisticated mechanisms to subvert it.
• Understanding HCV immune evasion strategies is key to developing effective therapies and vaccines.
• HCV persistence and disease progression are significantly influenced by the interplay between viral evasion tactics and host immune responses.