Human Leucocyte Antigen-A2 Restricted and Mycobacterium Tuberculosis 19-kDa Antigen-specific CD8+ T-cell Responses Are Oligoclonal and Exhibit a T-cell Cytotoxic Type 2 Response Cytokine-secretion Pattern
Overview
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CD8+ T cells can be grouped into two different types of secretory T lymphocytes, based on the cytokine-secretion pattern upon antigen exposure: those with a T-cell cytotoxic type 1 response (Tc1), which secrete interferon-gamma (IFN-gamma), or those with a T-cell cytotoxic type 2 response, which secrete interleukin (IL)-4 and IL-10. We examined the CD8+ T-cell response directed against an immunodominant human leucocyte antigen (HLA)-A2-presented peptide derived from a 19-kDa Mycobacterium tuberculosis-associated antigen. T cells were examined by functional analysis and by T-cell receptor (TCR) complementarity-determining region 3 (CDR3)-spectratyping, which defines the complexity of a T-cell response. T-cell stimulation with the immunodominant VLTDGNPPEV epitope yielded a Tc2 (IL-4) cytokine-secretion pattern and resulted in oligoclonal expansion of TCR-variable beta chain (VB) families, which differed from patient to patient. Generation of T-cell clones corroborated the notion that the CD8+ T-cell response directed against the HLA-A2-presented VLTDGNPPEV epitope leads to a Tc2 cytokine-secretion pattern in CD8+ T cells, as defined by IL-4 and granulocyte-macrophage colony-stimulating factor (GM-CSF) release. Characterization of the cytokine-secretion profile in HLA-A2/VLTDGNPPEV-tetramer sorted T cells from patients with active tuberculosis supported this observation: peptide-specific T cells from three of three patients secreted IL-4 and only one of three patients produced IFN-gamma in response to the nominal target epitope. Permutation of this T-cell epitope may aid to elicit a qualitatively different CD8+ T-cell response in patients with M. tuberculosis infection.
Peptide-Based Vaccines for Tuberculosis.
Gong W, Pan C, Cheng P, Wang J, Zhao G, Wu X Front Immunol. 2022; 13:830497.
PMID: 35173740 PMC: 8841753. DOI: 10.3389/fimmu.2022.830497.
High content cellular immune profiling reveals differences between rhesus monkeys and men.
Magalhaes I, Vudattu N, Ahmed R, Kuhlmann-Berenzon S, Ngo Y, Sizemore D Immunology. 2010; 131(1):128-40.
PMID: 20465573 PMC: 2966765. DOI: 10.1111/j.1365-2567.2010.03284.x.
Serana F, Sottini A, Caimi L, Palermo B, Natali P, Nistico P J Transl Med. 2009; 7:21.
PMID: 19317896 PMC: 2667493. DOI: 10.1186/1479-5876-7-21.
Sieling P, Hill P, Dobos K, Brookman K, Kuhlman A, Fabri M J Immunol. 2008; 180(9):5833-42.
PMID: 18424702 PMC: 2710377. DOI: 10.4049/jimmunol.180.9.5833.
Mycobacterium tuberculosis-specific CD8+ T cells and their role in immunity.
Woodworth J, Behar S Crit Rev Immunol. 2006; 26(4):317-52.
PMID: 17073557 PMC: 3134450. DOI: 10.1615/critrevimmunol.v26.i4.30.