title: Transient T cell receptor beta-chain variable region-specific expansions of CD4+ and CD8+ T cells during the early phase of pediatric human immunodeficiency virus infection: characterization of expanded cell populations by T cell receptor phenotyping.
abstract: T cell receptor (TCR) repertoire perturbations are commonly detected in CD8+ T cells during adult primary human immunodeficiency virus (HIV) infection and have been associated with HIV-specific cytotoxic T cell responses. By use of flow cytometry, transient high-level TCR beta-chain variable region-specific expansions of CD4+ and CD8+ T cells were observed more frequently in HIV-infected children than in children exposed to HIV who remained uninfected. TCR beta-chain diversity analysis and diversity-specific polymerase chain reaction were used to study the clonality of expanded CD4+ and CD8+ subsets. In CD8+ T cells, structural features of the complement-determining regions 3 were altered during the course of the expansion, and persistent TCR clonotypes were observed, consistent with antigen-driven selection. In contrast, TCR beta-chain variable region-specific expansions without clonotypic overrepresentation or persistence were observed in CD4+ T cells, possibly related to HIV-specific helper T cell responses or to the progressive destruction of the CD4+ cell compartment.
authors.affiliation: Laboratoire d'Immunologie, Institut de Recherches Cliniques de Montréal, McGill University, Montreal, Canada. hsoudeyns@justine.umontreal.ca
authors.forename: H
authors.initials: H
authors.lastname: Soudeyns
authors.forename: P
authors.initials: P
authors.lastname: Champagne
authors.forename: C L
authors.initials: CL
authors.lastname: Holloway
authors.forename: G U
authors.initials: GU
authors.lastname: Silvestri
authors.forename: N
authors.initials: N
authors.lastname: Ringuette
authors.forename: J
authors.initials: J
authors.lastname: Samson
authors.forename: N
authors.initials: N
authors.lastname: Lapointe
authors.forename: R P
authors.initials: RP
authors.lastname: Sékaly
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D002675:Child, Preschool; D019674:Genes, T-Cell Receptor beta; D015658:HIV Infections / Q000276:immunology* / Q000635:transmission; D015497:HIV-1 / Q000276:immunology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D018445:Infectious Disease Transmission, Vertical; D008137:Longitudinal Studies; D008213:Lymphocyte Activation; D010641:Phenotype; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000145:classification / Q000235:genetics*; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D016693:Receptors, Antigen, T-Cell, alpha-beta