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The Journal of Immunology, 2006, 176: 3315-3319.
Copyright © 2006 by The American Association of Immunologists

CUTTING EDGE

Cutting Edge: The Direct Action of Type I IFN on CD4 T Cells Is Critical for Sustaining Clonal Expansion in Response to a Viral but Not a Bacterial Infection1

Colin Havenar-Daughton, Ganesh A. Kolumam and Kaja Murali-Krishna2

Department of Immunology and Washington National Primate Center, University of Washington, Seattle, WA 98195

The action of type I IFN (IFN-I) on APCs is well studied, but their direct effect on CD4 T cells is unclear. To address this, we transferred IFN-I receptor-deficient (IFN-IR0) and -sufficient (wild-type, WT) TCR-transgenic CD4 T cells into WT mice and analyzed their response to immunization. In response to lymphocytic choriomeningitis virus immunization, WT CD4 T cells expanded ~100-fold, whereas IFN-IR0 CD4 T cells expanded <10-fold. However, both WT and IFN-IR0 CD4 T cells expanded ~10-fold after Listeria monocytogenes immunization. Poor expansion of IFN-IR0 CD4 T cells after lymphocytic choriomeningitis virus immunization was not due to a defect in proliferation or initial activation but to poor survival of the daughter cells. Thus, direct IFN-I signals can play either a critical or minimal role in CD4 T cell clonal expansion depending on the specific pathogen.




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