Detection of polyfunctional Mycobacterium tuberculosis-specific T cells and association with viral load in HIV-1-infected persons

J Infect Dis. 2008 Apr 1;197(7):990-9. doi: 10.1086/529048.


Background: The human immunodeficiency virus type 1 (HIV-1) epidemic is associated with a significant increase in the incidence of tuberculosis (TB); however, little is known about the quality of Mycobacterium tuberculosis (MTB)-specific cellular immune responses in coinfected individuals.

Methods: A total of 137 HIV-1-positive individuals in Durban, South Africa, were screened with the use of overlapping peptides spanning Ag85A, culture filtrate protein 10 (CFP-10), early secretory antigen target 6 (ESAT-6), and TB10.4, in an interferon (IFN)-gamma enzyme-linked immunospot (ELISPOT) assay. Intracellular cytokine staining for MTB-specific production of IFN-gamma, tumor necrosis factor (TNF)-alpha, and interleukin (IL)-2 was performed, as was ex vivo phenotyping of memory markers on MTB-specific T cells.

Results: A total of 41% of subjects responded to ESAT-6 and/or CFP-10, indicating the presence of latent MTB infection. The proportion of MTB-specific IFN-gamma(+)/TNF-alpha(+) CD4(+) cells was significantly higher than the proportion of IFN-gamma(+)/IL-2(+) CD4(+) cells (P = .0220), and the proportion of MTB-specific IL-2-secreting CD4 cells was inversely correlated with the HIV-1 load (P = .0098). MTB-specific CD8 T cells were predominately IFN-gamma(+)/TNF-alpha(+)/IL-2(-). Ex vivo memory phenotyping of MTB-specific CD4 and CD8 T cells indicated an early to intermediate differentiated phenotype for the population of effector memory cells.

Conclusions: Polyfunctional MTB-specific CD4 and CD8 T cell responses are maintained in the peripheral blood of HIV-1-positive individuals, in the absence of active disease, and the functional capacity of these responses is affected by HIV-1 disease status.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, Bacterial / immunology
  • Antigens, CD / analysis
  • Cytokines / metabolism
  • HIV Infections / complications*
  • HIV Infections / immunology*
  • HIV Infections / virology
  • HIV-1 / isolation & purification*
  • Humans
  • Lymphocyte Subsets / immunology
  • Mycobacterium tuberculosis / immunology*
  • South Africa
  • T-Lymphocytes / chemistry
  • T-Lymphocytes / immunology*
  • Tuberculosis / immunology*
  • Viral Load*


  • Antigens, Bacterial
  • Antigens, CD
  • Cytokines