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M9610529.TXT
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1996-01-30
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Document 0529
DOCN M9610529
TI During HIV infection, CD4+ CD38+ T-cells are the predominant circulating
CD4+ subset whose HLA-DR positivity increases with disease progression
and whose V beta repertoire is similar to that of CD4+ CD38- T-cells.
DT 9601
AU Ramzaoui S; Jouen-Beades F; Gilbert D; Borsa-Lebas F; Michel Y; Humbert
G; Tron F; Groupe de Recherche en Immunopathologie, Institut Federatif
de; Recherche Multidisciplinaire sur les Peptides, France.
SO Clin Immunol Immunopathol. 1995 Oct;77(1):33-41. Unique Identifier :
AIDSLINE MED/96010051
AB Three-color automated flow cytometry was carried out on peripheral blood
CD4+ and CD8+ T-lymphocytes of 42 HIV-positive patients using tri-color
anti-CD4 or anti-CD8, phycoerythrin-anti-CD38, and
fluorescein-anti-HLA-DR, mAbs to elucidate further the T-cell activation
hypothesis recently proposed to explain CD4+ T-cell abnormalities
observed during HIV infection. CD4+ CD38+ T-cells constituted the major
part of circulating CD4+ T-cells in HIV-infected patients and their
HLA-DR molecule positivity increased as their disease progressed. The
level of CD38 and HLA-DR expression on CD4+ T-cells was positively
correlated to that of CD8+ T-cells and to the level of beta
2-microglobulin. Next, to determine whether CD38 expression was
associated with a selective expansion or deletion of V beta gene-defined
subsets, we compared the V beta gene frequencies between CD38+ and CD38-
T-cells from HIV-infected CDC stage II patients using 13 mAbs specific
to V beta families. While selective expansion of certain V beta families
was observed in CD4+ and CD8+ T-cells the T-cell receptor V beta subset
distribution was similar among CD38+ and CD38-, CD4+ and CD8+ T-cells,
suggesting that CD38+ expression was either independent of an
HIV-encoded antigen-driven process or rather indicative of T-cell
immaturity. It is proposed that the phenotype of circulating CD4+ and
CD8+ T-cells of HIV-infected patients is a feature of two different
mechanisms: (i) an in vitro activation state responsible for increased
DR expression and selective expansion of V beta gene-defined subsets,
and (ii) T-cell immaturity due to an increased turnover of these cells
and accounting for increased CD38 expression.
DE beta 2-Microglobulin/METABOLISM Acquired Immunodeficiency
Syndrome/*IMMUNOLOGY/PATHOLOGY Adult Antigens,
Differentiation/*METABOLISM Antiviral Agents/THERAPEUTIC USE CD4
Lymphocyte Count CD4-CD8 Ratio CD4-Positive T-Lymphocytes/*IMMUNOLOGY
CD8-Positive T-Lymphocytes/IMMUNOLOGY Female Gene Rearrangement,
beta-Chain T-Cell Antigen Receptor Human HLA-DR Antigens/*METABOLISM
Lymphocyte Transformation Male Middle Age Nucleosidases/*METABOLISM
Receptors, Antigen, T-Cell, alpha-beta/*GENETICS Support, Non-U.S.
Gov't T-Lymphocyte Subsets/*IMMUNOLOGY Zidovudine/THERAPEUTIC USE
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).