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Antigen Availability Shapes T Cell Differentiation and Function during Tuberculosis.

Cell host & microbe | 2017

CD4 T cells are critical for protective immunity against Mycobacterium tuberculosis (Mtb), the cause of tuberculosis (TB). Yet to date, TB vaccine candidates that boost antigen-specific CD4 T cells have conferred little or no protection. Here we examined CD4 T cell responses to two leading TB vaccine antigens, ESAT-6 and Ag85B, in Mtb-infected mice and in vaccinated humans with and without underlying Mtb infection. In both species, Mtb infection drove ESAT-6-specific T cells to be more differentiated than Ag85B-specific T cells. The ability of each T cell population to control Mtb in the lungs of mice was restricted for opposite reasons: Ag85B-specific T cells were limited by reduced antigen expression during persistent infection, whereas ESAT-6-specific T cells became functionally exhausted due to chronic antigenic stimulation. Our findings suggest that different vaccination strategies will be required to optimize protection mediated by T cells recognizing antigens expressed at distinct stages of Mtb infection.

Pubmed ID: 28618268 RIS Download

Additional research tools detected in this publication

None found

Antibodies used in this publication

Associated grants

  • Agency: NIAID NIH HHS, United States
    Id: T32 AI007509
  • Agency: NIAID NIH HHS, United States
    Id: HHSN272201300006C
  • Agency: NCRR NIH HHS, United States
    Id: S10 RR027366
  • Agency: NCI NIH HHS, United States
    Id: T32 CA009537
  • Agency: NIAID NIH HHS, United States
    Id: R01 AI087915
  • Agency: NIAID NIH HHS, United States
    Id: R01 AI076327
  • Agency: NIAID NIH HHS, United States
    Id: U19 AI106761

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