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

The Journal of Infectious Diseases
Cheryl L DayBruce D Walker

Abstract

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. 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. 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(+)/TN...Continue Reading

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