Journal
JOURNAL OF VIROLOGY
Volume 79, Issue 1, Pages 202-213Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.79.1.202-213.2005
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Funding
- NIAID NIH HHS [AI48785, R01 AI048785, R21 AI048785] Funding Source: Medline
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R21AI048785, R01AI048785] Funding Source: NIH RePORTER
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The role of tumor necrosis factor (TNF) in regulating various phases of the antiviral T-cell response is incompletely understood. Additionally, despite strong evidence ascribing a role for TNF in protecting against T-cell-dependent autoimmunity, the underlying mechanisms are still obscure. To address these issues, we have investigated the role of tumor necrosis factor receptors (TNFRs) I (p55R) and II (p75R) in regulating CD8 T-cell responses to lymphocytic choriomeningitis virus (LCNW) with wild-type, p55R-deficient (p55(-/-)), p75R-deficient (p75(-/-)), and p55R- and p75R-deficient (DKO) mice. Loss of p55R increased the number of memory CD8 T cells to only one of the two immunodominant epitopes, and p75R deficiency had a minimal impact on the T-cell response to LCW. Strikingly, deficiency of both p55R and p75R had a more dramatic effect on the LCW-specific CD8 T-cell response; in the DKO mice, as a sequel to enhanced expansion and a reduction in contraction of CD8 T cells, there was a substantial increase in the number of memory CD8 T cells (specific to the two immunodominant epitopes). While the majority of LCW-specific memory CD8 T cells in wild-type mice were CD62L(hi) CCR7(hi) (central memory), a major proportion of memory CD8 T cells in DKO mice were CD62L(lo) CCR7(hi). TNFR deficiency did not affect the proliferative renewal of memory CD8 T cells. Taken together, these data suggested that TNFRs p55R and p75R have overlapping roles in downregulating CD8 T-cell responses and establishment of immune homeostasis during an acute viral infection.
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