title: Increased susceptibility to apoptosis of CD56dimCD16+ NK cells induces the enrichment of IFN-gamma-producing CD56bright cells in tuberculous pleurisy.
abstract: Tuberculous pleuritis is a good model for the study of specific cells at the site of active Mycobacterium tuberculosis (Mtb) infection. We investigated the frequency and phenotype of NK cells in paired samples of peripheral blood and pleural fluid (PF) from patients with tuberculosis (TB) or parapneumonic infection. We demonstrated for the first time a reduction of NK cells in PF from TB with an enrichment in the CD56brightCD16- subset. In agreement, in PF NK cells we observed an increased expression of CD94, NKG2A, CD62L, and CCR7 molecules and lower expression of Bcl-2 and perforin. The activation markers CD69 and HLA-DR were also increased. The enrichment in the CD56bright subset was due to an increased susceptibility to apoptosis of CD56+CD16+ NK cells mediated by heat-labile and stable soluble factors present in tuberculous effusions and not in PF from other etiologies. Furthermore, in TB patients, Mtb-induced IFN-gamma production by PF NK cells was not dependent on the presence of CD3+, CD19+, and CD14+ cells, suggesting a direct interaction of CD56bright cells with Mtb and/or the involvement of other accessory cells present at the site of Mtb infection.
authors.affiliation: Departamento de Inmunología, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina, Buenos Aires, Argentina.
authors.forename: Pablo
authors.initials: P
authors.lastname: Schierloh
authors.forename: Noemí
authors.initials: N
authors.lastname: Yokobori
authors.forename: Mercedes
authors.initials: M
authors.lastname: Alemán
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Musella
authors.forename: Macarena
authors.initials: M
authors.lastname: Beigier-Bompadre
authors.forename: María A
authors.initials: MA
authors.lastname: Saab
authors.forename: Leandro
authors.initials: L
authors.lastname: Alves
authors.forename: Eduardo
authors.initials: E
authors.lastname: Abbate
authors.forename: Silvia S
authors.initials: SS
authors.lastname: de la Barrera
authors.forename: María C
authors.initials: MC
authors.lastname: Sasiain
mesh_terms: D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000378:metabolism; D018941:Antigens, CD19 / Q000378:metabolism; D017209:Apoptosis / Q000276:immunology*; D017252:CD3 Complex / Q000378:metabolism; D019002:CD56 Antigen / Q000378:metabolism; D058851:GPI-Linked Proteins; D006801:Humans; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000096:biosynthesis; D007694:Killer Cells, Natural / Q000145:classification / Q000276:immunology* / Q000473:pathology*; D018950:Lipopolysaccharide Receptors / Q000378:metabolism; D016131:Lymphocyte Subsets / Q000276:immunology / Q000473:pathology; D008875:Middle Aged; D010641:Phenotype; D010996:Pleural Effusion / Q000276:immunology / Q000473:pathology; D017452:Receptors, IgG / Q000378:metabolism; D014396:Tuberculosis, Pleural / Q000276:immunology* / Q000473:pathology*
chemical_list: D015703:Antigens, CD; D018941:Antigens, CD19; D017252:CD3 Complex; D019002:CD56 Antigen; C428200:FCGR3B protein, human; D058851:GPI-Linked Proteins; D018950:Lipopolysaccharide Receptors; D017452:Receptors, IgG; D007371:Interferon-gamma