title: Opportunist mycobacteria express ligands that stimulate production of human V gamma 9V delta 2 T lymphocytes.
abstract: Human gamma delta T cells are known to respond at high frequencies to pathogenic mycobacteria. Here we show that opportunistic strains of mycobacteria share with pathogenic mycobacteria the ability to trigger at high frequencies human V gamma 9V delta 2 T-cell-receptor-positive T lymphocytes. Stimulating ligands were present in part in a low-molecular-weight fraction of lysates from opportunistic mycobacteria, as has been found for pathogenic strains. These results support the view that postnatal exposure to ever-present opportunistic mycobacteria may be a driving force for the numerical expansion of the V gamma 9V delta 2 T-cell subset in adolescence.
authors.affiliation: Institute of Medical Microbiology and Hygiene, Technical University of Munich, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Häcker
authors.forename: S
authors.initials: S
authors.lastname: Kromer
authors.forename: K
authors.initials: K
authors.lastname: Heeg
authors.forename: J
authors.initials: J
authors.lastname: Ivanyi
authors.forename: H
authors.initials: H
authors.lastname: Wagner
authors.forename: K
authors.initials: K
authors.lastname: Pfeffer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000945:Antigens, Differentiation, T-Lymphocyte / Q000096:biosynthesis; D017252:CD3 Complex; D002478:Cells, Cultured; D005434:Flow Cytometry; D006801:Humans; D016130:Immunophenotyping; D008213:Lymphocyte Activation / Q000276:immunology*; D008875:Middle Aged; D009161:Mycobacterium / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000096:biosynthesis; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000096:biosynthesis; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000096:biosynthesis*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D016692:Receptors, Antigen, T-Cell, gamma-delta