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Herpes simplex virus-infected cells disarm killer lymphocytes
D L Confer1, G M Vercellotti, D Kotasek
1Department of Medicine, University of Minnesota, Minneapolis 55455.
Summary
Herpes simplex virus (HSV) infection of human cells inhibits natural killer (NK) cell activity. This viral immune evasion mechanism may explain persistent infections and failed immune surveillance.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Herpes simplex viruses (HSVs) are common human pathogens.
- Natural killer (NK) cells are crucial for innate immunity against viral infections.
Purpose of the Study:
- To investigate the effect of HSV infection on NK cell and interleukin 2-activated killer cell activity.
- To elucidate the mechanism by which HSV interferes with killer cell function.
Main Methods:
- Infection of human endothelial cells and fibroblasts with HSV.
- Co-culture assays with HSV-infected cells and effector immune cells (NK cells, IL-2-activated killer cells).
- Assessment of target cell lysis and protein glycosylation inhibition using tunicamycin.
Main Results:
- HSV-infected cells potently inhibited the lytic activity of NK cells and IL-2-activated killer cells.
- Inhibition required cell-to-cell contact and occurred within 8 hours of viral infection.
- Blocking protein glycosylation with tunicamycin prevented the impairment of killer cell function.
Conclusions:
- HSV infection directly impairs killer cell function, representing a novel immune evasion strategy.
- This mechanism may contribute to the persistence of herpes simplex virus infections.
- HSV-induced inhibition of immune surveillance offers insights into viral pathogenesis.