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The Journal of Immunology, 2004, 172: 6065-6073.
Copyright © 2004 by The American Association of Immunologists

Toll-Like Receptor Ligands Directly Promote Activated CD4+ T Cell Survival

Andrew E. Gelman, Jidong Zhang, Yongwon Choi and Laurence A. Turka1

Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104

Toll-like receptor (TLR) engagement by pathogen-associated molecular patterns (PAMPs) is an important mechanism for optimal cellular immune responses. APC TLR engagement indirectly enhances activated CD4+ T cell proliferation, differentiation, and survival by promoting the up-regulation of costimulatory molecules and the secretion of proinflammatory cytokines. However, TLRs are also expressed on CD4+ T cells, suggesting that PAMPs may also act directly on activated CD4+ T cells to mediate functional responses. In this study, we show that activated mouse CD4+ T cells express TLR-3 and TLR-9 but not TLR-2 and TLR-4. Treatment of highly purified activated CD4+ T cells with the dsRNA synthetic analog poly(I:C) and CpG oligodeoxynucleotides (CpG DNA), respective ligands for TLR-3 and TLR-9, directly enhanced their survival without augmenting proliferation. In contrast, peptidoglycan and LPS, respective ligands for TLR-2 and TLR-4 had no effect. Enhanced survival mediated by either poly(I:C) or CpG DNA required NF-{kappa}B activation and was associated with Bcl-xL up-regulation. However, only CpG DNA, but not poly(I:C)-mediated effects on activated CD4+ T cells required the TLR/IL-1R domain containing adaptor molecule myeloid differentiation factor 88. Collectively, our results demonstrate that PAMPs can directly promote activated CD4+ T cell survival, suggesting that TLRs on T cells can directly modulate adaptive immune responses.




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