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The Journal of Immunology, 2003, 171: 6733-6741.
Copyright © 2003 by The American Association of Immunologists

CTL Are Inactivated by Herpes Simplex Virus-Infected Cells Expressing a Viral Protein Kinase 1

Derek D. Sloan*,{ddagger}, George Zahariadis{dagger},{ddagger}, Christine M. Posavad*,{ddagger}, Nichlos T. Pate{ddagger}, Steven J. Kussick* and Keith R. Jerome2,*,{ddagger}

Departments of * Laboratory Medicine and {dagger} Medicine, University of Washington, Seattle, WA 98195; and {ddagger} Program in Infectious Diseases, Fred Hutchinson Cancer Research Center, Seattle, WA 98109

Numerous cell-to-cell signals tightly regulate CTL function. Human fibroblasts infected with HSV type 1 or 2 can generate such a signal and inactivate human CTL. Inactivated CTL lose their ability to release cytotoxic granules and synthesize cytokines when triggered through the TCR. Inactivation requires cell-to-cell contact between CTL and HSV-infected cells. However, inactivated CTL are not infected with HSV. The inactivation of CTL is sustainable, as CTL function remains impaired when the CTL are removed from the HSV-infected cells. IL-2 treatment does not alter inactivation, and the inactivated phenotype is not transferable between CTL, distinguishing this phenotype from traditional anergy and T regulatory cell models. CTL inactivated by HSV-infected cells are not apoptotic, and the inactivated state can be overcome by phorbol ester stimulation, suggesting that inactivated CTL are viable and that the signaling block is specific to the TCR. HSV-infected cells require the expression of US3, a viral protein kinase, to transmit the inactivating signal. Elucidation of the molecular nature of this signaling pathway may allow targeted manipulation of CTL function.




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