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1994-08-20
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Document 0574
DOCN M9480574
TI Cytotoxic T lymphocyte activity and CD8 subpopulations in children at
risk of HIV infection.
DT 9410
AU Aldhous MC; Watret KC; Mok JY; Bird AG; Froebel KS; University
Department of Medicine, Royal Infirmary, Edinburgh,; UK.
SO Clin Exp Immunol. 1994 Jul;97(1):61-7. Unique Identifier : AIDSLINE
MED/94306754
AB HIV-specific cytotoxic T lymphocytes (CTL) are thought to play a major
role in viral control in HIV-infected adults. Changes in the relative
proportions of CD8 lymphocyte subpopulations are also thought to be
associated with disease progression. Less is known about the relative
effectiveness of CTL against different HIV targets, or about the
relationship, if any, between CTL activity and CD8 subpopulations. We
have measured CTL activity against four HIV gene products (gag, tat, pol
and env) and expression of CD45RO, CD45RA, HLA-DR, CD29, S6F1, and CD57
surface markers on CD8 cells from nine HIV-infected and 11
HIV-uninfected children. Of nine HIV-infected children, six showed
antigen-specific CTL activity on at least one occasion: 4/6 directed
against tat, 6/6 against pol, 1/6 against env, and 1/6 against gag.
However, the specificity of the CTL activity varied between children and
within individual children with time. Furthermore, two uninfected
children showed CTL activity, one to HIV-gag, -pol and -tat, and the
other to HIV-pol. All the HIV-infected and two uninfected children had
abnormal proportions of CD8 subpopulations in whole blood compared with
age-matched controls. There was no correlation between CTL activity and
CD8 subsets in whole blood. Five children changed from CTL-positive to
CTL-negative (or vice versa) during the study. In these, the occasions
when CTL activity was detected coincided with an increase in CD8 cells,
an expansion of HLA-DR+ CD8 cells and a loss of CD45RA+ CD8 cells.
DE Antigens, CD8/*METABOLISM Antigens, Differentiation,
T-Lymphocyte/METABOLISM Child Child, Preschool Cytotoxicity,
Immunologic Female Human HIV Antigens/IMMUNOLOGY HIV
Infections/*IMMUNOLOGY/TRANSMISSION In Vitro Infant Maternal-Fetal
Exchange/IMMUNOLOGY Pregnancy Risk Factors Support, Non-U.S. Gov't
T-Lymphocyte Subsets/*IMMUNOLOGY T-Lymphocytes, Cytotoxic/*IMMUNOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).