title: CD4+ and CD8+ T cell receptor repertoire perturbations with normal levels of T cell receptor excision circles in HIV-infected, therapy-naive adolescents.
abstract: Our objective was to determine whether treatment-naive HIV-infected adolescents manifest abnormalities in thymus function and peripheral T cell repertoire, and to assess relationships of these immunologic characteristics with each other, with plasma HIV virus load, and T cell surface markers. TCR Vbeta repertoire was determined by CDR3 length spectratyping in purified CD4(+) and CD8(+) T cells of high-risk, HIV-negative adolescents and of treatment-naive, HIV-infected adolescents. Thymus function was investigated by the simultaneous examination of T cell receptor excision circles (TRECs) in the CD4(+) and CD8(+) T cell subsets. HIV-infected adolescents exhibited significantly greater perturbations in their TCR Vbeta repertoire in comparison with HIV-negative subjects. Perturbations in the CD8(+) T cell compartment were more profound in comparison with CD4(+) T cells. The CD4(+) TCR Vbeta perturbations were negatively correlated with the total and phenotypically naive CD4(+) T cells, and with CD4(+) TRECs. CD8(+) TRECs, although not correlated with CD8(+) TCR Vbeta perturbations, showed negative correlation with memory and activated CD8(+) T cells. Interestingly, TRECs in CD4(+) and CD8(+) T cells were not significantly different between HIV-infected and uninfected adolescents. The TCR Vbeta repertoire in adolescents is profoundly perturbed even in early stages of HIV infection, when total CD4(+) cell counts in most subjects are within normal limits. The correlative analyses demonstrating negative association of CD4(+) cell TRECs with CD4(+) TCR Vbeta perturbations and of CD8(+) TRECs with CD8(+) cell activation markers provide evidence of the intense activation of the central and peripheral immune compartments in this study population.
authors.affiliation: Immunology and Inflammation Center of Excellence, North Shore-Long Island Jewish Health System and Research Institute, Manhasset, New York 11030, USA. spahwa@nshs.edu
authors.forename: Savita
authors.initials: S
authors.lastname: Pahwa
authors.forename: Vivek
authors.initials: V
authors.lastname: Chitnis
authors.forename: Richard M
authors.initials: RM
authors.lastname: Mitchell
authors.forename: Sanjit
authors.initials: S
authors.lastname: Fernandez
authors.forename: Alamelu
authors.initials: A
authors.lastname: Chandrasekharan
authors.forename: Craig M
authors.initials: CM
authors.lastname: Wilson
authors.forename: Steven D
authors.initials: SD
authors.lastname: Douglas
mesh_terms: D000293:Adolescent; D019380:Anti-HIV Agents / Q000627:therapeutic use; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000821:virology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000821:virology; D022801:Complementarity Determining Regions; D018450:Disease Progression; D005260:Female; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor; D015658:HIV Infections / Q000188:drug therapy / Q000276:immunology* / Q000821:virology; D015497:HIV-1 / Q000276:immunology; D006801:Humans; D008213:Lymphocyte Activation; D008297:Male; D016133:Polymerase Chain Reaction; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics* / Q000378:metabolism; D016176:T-Lymphocyte Subsets; D019562:Viral Load
chemical_list: D019380:Anti-HIV Agents; D022801:Complementarity Determining Regions; D016693:Receptors, Antigen, T-Cell, alpha-beta