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Gamma interferon blocks gammaherpesvirus reactivation from latency.
Ashley L Steed1, Erik S Barton, Scott A Tibbetts
1Washington University School of Medicine, Department of Pathology and Immunology, 660 South Euclid Ave., St. Louis, MO 63110, USA.
Journal of Virology
|December 15, 2005
Summary
Gamma interferon (IFN-gamma) inhibits herpesvirus reactivation from latency. Depleting IFN-gamma in infected mice increases viral reactivation, highlighting its role in immune surveillance against latent gammaherpesvirus 68 (gammaHV68).
Area of Science:
- Virology
- Immunology
- Pathogenesis
Background:
- Herpesvirus latency and reactivation are key to infection and disease.
- Gamma interferon (IFN-gamma) signaling is implicated in controlling gammaherpesvirus 68 (gammaHV68) reactivation and associated vasculitis.
Purpose of the Study:
- To investigate the role of IFN-gamma in inhibiting gammaHV68 reactivation from latency.
- To determine if IFN-gamma controls viral gene expression during latency in vivo.
Main Methods:
- Tissue culture experiments to assess IFN-gamma's inhibitory effect on gammaHV68 reactivation.
- In vivo studies involving depletion of IFN-gamma in latently infected mice to evaluate its impact on viral reactivation frequency.
Main Results:
- IFN-gamma demonstrated potent inhibition of gammaHV68 reactivation from latency in vitro.
- In vivo, IFN-gamma was shown to control viral gene expression during latency.
- Depletion of IFN-gamma in latently infected mice led to a significant increase in the frequency of cells reactivating the virus.
Conclusions:
- IFN-gamma is a critical inhibitor of gammaHV68 reactivation from latency.
- IFN-gamma plays a vital role in immune surveillance, limiting the reactivation of latent gammaHV68.