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2007:
Jacobsen Marc; Detjen Anne K; Mueller Henrik; Gutschmidt Andrea; Leitner Sandra; Wahn Ulrich; Magdorf Klaus; Kaufmann Stefan H E
Clonal expansion of CD8+ effector T cells in childhood tuberculosis.
Journal of immunology (Baltimore, Md. : 1950) 2007;
179(
2):.
The role of CD8(+) T cells in human tuberculosis (TB) remains elusive. We analyzed the T cell repertoire and phenotype in 1) children with active TB (< or =4 years), 2) healthy latently Mycobacterium tuberculosis-infected children, and 3) noninfected age-matched (tuberculin skin test-negative) controls. Ex vivo phenotyping of T cell subpopulations by flow cytometry revealed a significant increase in the proportion of CD8(+)CD45RO(-)CD62L(-)CD28(-)CD27(-) effector T cells (T(EF)) in the peripheral blood of children with active TB (22.1 vs 9.5% in latently M. tuberculosis-infected children, vs 8.5% in tuberculin skin test-negative controls). Analyses of TCR variable beta-chains revealed markedly skewed repertoires in CD8(+) T(EF) and effector memory T cells. Expansions were restricted to single TCR variable beta-chains in individual donors indicating clonal growth. CDR3 spectratyping and DNA sequencing verified clonal expansion as the cause for CD8(+) effector T cell enrichment in individual TB patients. The most prominent enrichment of highly similar T(EF) clones (>70% of CD8(+) T(EF)) was found in two children with active severe TB. Therefore, clonal expansion of CD8(+) T(EF) occurs in childhood TB with potential impact on course and severity of disease.
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