The yellow fever virus vaccine induces a broad and polyfunctional human memory CD8+ T cell response.

The Journal of Immunology : Official Journal of the American Association of Immunologists
Rama S AkondyRafi Ahmed

Abstract

The live yellow fever vaccine (YF-17D) offers a unique opportunity to study memory CD8(+) T cell differentiation in humans following an acute viral infection. We have performed a comprehensive analysis of the virus-specific CD8(+) T cell response using overlapping peptides spanning the entire viral genome. Our results showed that the YF-17D vaccine induces a broad CD8(+) T cell response targeting several epitopes within each viral protein. We identified a dominant HLA-A2-restricted epitope in the NS4B protein and used tetramers specific for this epitope to track the CD8(+) T cell response over a 2 year period. This longitudinal analysis showed the following. 1) Memory CD8(+) T cells appear to pass through an effector phase and then gradually down-regulate expression of activation markers and effector molecules. 2) This effector phase was characterized by down-regulation of CD127, Bcl-2, CCR7, and CD45RA and was followed by a substantial contraction resulting in a pool of memory T cells that re-expressed CD127, Bcl-2, and CD45RA. 3) These memory cells were polyfunctional in terms of degranulation and production of the cytokines IFN-gamma, TNF-alpha, IL-2, and MIP-1beta. 4) The YF-17D-specific memory CD8(+) T cells had a phenotyp...Continue Reading

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Citations

Feb 9, 2011·Immunology and Cell Biology·Rafi Ahmed, Rama S Akondy
Sep 15, 2010·Proceedings of the National Academy of Sciences of the United States of America·Thaneeya DuangchindaGavin Screaton
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