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1996-02-27
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Document 0428
DOCN M9630428
TI Spontaneous lymphocyte proliferation in human T-cell lymphotropic virus
type I (HTLV-I) and HTLV-II infection: T-cell subset responses and their
relationships to the presence of provirus and viral antigen production.
DT 9603
AU Prince HE; York J; Golding J; Owen SM; Lal RB; Cellular Immunology
Laboratory, American Red Cross Blood and; Tissue Services, Los Angeles,
California 90006, USA.
SO Clin Diagn Lab Immunol. 1994 May;1(3):273-82. Unique Identifier :
AIDSLINE MED/96050823
AB Spontaneous lymphocyte proliferation (SLP) during in vitro culture of
mononuclear cells (MCs) characterizes over half of asymptomatic
individuals infected with human T-cell lymphotropic virus type I
(HTLV-I) or HTLV-II. Both CD4 and CD8 T-cell subsets within MC cultures
are activated during SLP, as judged by high-density CD25 (CD25bright)
expression; it is unclear, however, whether both cell subsets can
directly undergo SLP. In the present investigation, the SLP capacities
of purified CD8 and CD4 cells were examined in subjects infected with
HTLV-I (n = 19) or HTLV-II (n = 54) in relation to the SLP status of MCs
from each subject. No increase in SLP was observed for CD8 or CD4 cells
from SLP-negative (SLP-) HTLV-infected subjects, whereas robust SLP
characterized CD8 cells from all SLP-positive (SLP+) individuals,
regardless of HTLV type. In contrast, SLP+ CD4 cells characterized only
23% (7 of 31) of HTLV-II+ SLP+ individuals, whereas SLP+ CD4 cells
characterized 100% of HTLV-I+ SLP+ individuals. In cocultures of
HTLV-II+ SLP+ CD8 cells and autologous SLP- CD4 cells, sizable
proportions of both CD8 cells and CD4 cells coexpressed CD25bright,
suggesting that SLP- CD4 cells were activated in the presence of SLP+
CD8 cells. PCR analysis for tax sequences detected provirus in most CD4-
and CD8-cell preparations from HTLV-seropositive individuals, regardless
of type and the SLP status of cell subsets. To determine whether SLP was
associated with activation of viral genes, levels of HTLV-I and HTLV-II
core antigen (Ag) in supernatants were measured. Viral Ag production and
SLP responses were significantly correlated for both CD4 and CD8 cells
in both HTLV-I and HTLV-II infections. However, inhibition of CD8- or
CD4-cell SLP by cyclosporin A or anti-Tac (anti-CD25) did not reduce Ag
production, indicating that Ag production is not coupled to SLP. These
findings show that CD4 cells from SLP+ HTLV-I+ and SLP+ HTLV-II+
individuals differ in SLP capacity, that the absence of SLP does not
indicate a lack of infection, and that production of viral Ag is
associated with, but not dependent on, SLP.
DE Base Sequence CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Genome, Viral Human HTLV-I
Antigens/*BIOSYNTHESIS HTLV-I Infections/*IMMUNOLOGY HTLV-II
Antigens/*BIOSYNTHESIS HTLV-II Infections/*IMMUNOLOGY Leukocytes,
Mononuclear/IMMUNOLOGY *Lymphocyte Transformation Molecular Sequence
Data Monocytes/IMMUNOLOGY Proviruses/*IMMUNOLOGY Support, Non-U.S.
Gov't T-Lymphocyte Subsets/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).