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Cytokines and chemokines in the immune response to hepatitis C infection
M Heydtmann1, P Shields, G McCaughan
1Liver Research Laboratories, University of Birmingham, Queen Elizabeth Medical Centre, Birmingham, UK.
Insights
Hepatitis C virus (HCV) infection persists in most patients, leading to liver disease. Immune responses, involving cytokines and chemokines, are crucial for clearing HCV and preventing chronic infection.
Area of Science:
- Immunology
- Virology
- Hepatology
Background:
- Hepatitis C virus (HCV) infects over 170 million globally, causing significant mortality.
- Most acute infections become chronic, potentially leading to liver disease and fibrosis.
- HCV survival hinges on host immune responses and viral evasion strategies.
Purpose of the Study:
- To review recent advances in understanding Hepatitis C virus immune responses.
- To explore the role of cytokines and chemokines in HCV infection outcomes.
- To highlight viral mechanisms for evading host immunity.
Main Methods:
- Review of recent scientific literature on Hepatitis C virus immunology.
- Analysis of studies on innate and cognate immune system involvement.
- Examination of cytokine and chemokine network roles in HCV infection.
Main Results:
- Vigorous type 1 immune responses are essential for viral elimination.
- Chemokines are critical for recruiting effector cells to the liver.
- HCV can manipulate T cell cytokine profiles and resist antiviral cytokines like interferon.
Conclusions:
- Host immune responses, particularly type 1 immunity and chemokine activity, are key to controlling Hepatitis C virus.
- HCV employs sophisticated mechanisms to evade immune detection and clearance.
- Understanding these interactions is vital for developing effective therapies.
Abstract:
Over 170 million people are infected with the hepatitis C virus worldwide, resulting in a large disease burden and significant mortality. Hepatitis C virus is rarely cleared in the acute phase of the infection and most patients become chronically infected; a proportion of these patients develop progressive liver disease and fibrosis. The outcome of infection depends on the immune responses of both the innate and cognate immune systems, and these in turn are orchestrated by networks of cytokines and chemokines. There is evidence that a vigorous type 1 immune response to viral proteins is required for viral elimination, and the recruitment of such effector cells to the liver is dependent on the local activity of specific inducible chemokines. Multiple factors determine the ability of the hepatitis C virus to survive host immune responses, including an ability to alter the cytokine profile secreted by T cells and to cause resistance to the effects of antiviral cytokines such as interferon. In the present review, we briefly cover the important advances made in this area over the past 12 months.
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