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M9630050.TXT
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1996-02-27
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Document 0050
DOCN M9630050
TI Effects of cytokines on HIV-1 production by thymocytes.
DT 9603
AU Uittenbogaart CH; Anisman DJ; Zack JA; Economides A; Schmid I; Hays EF;
Department of Pediatrics, UCLA School of Medicine, USA.
SO Thymus. 1994-95;23(3-4):155-75. Unique Identifier : AIDSLINE
MED/96076591
AB The thymus is essential for normal T cell development and is
particularly active during fetal and postnatal life. Here we describe in
vitro studies of HIV-infected thymocytes cultured with cytokines
normally produced in the thymus. Virus expression was determined by
measuring p24 antigen levels in the culture supernatants. Addition of
IL-2+IL-4 and IL-4+IL-7 to the HIV-infected cultures of both fetal and
postnatal thymocytes resulted in various levels of synergistic
expression of p24 antigen. When differences in phenotype between
HIV-infected and non-infected (sham-treated) cultures from the same
specimen were evaluated, there was a decrease in the percentages and
absolute numbers of CD4-bearing cells in HIV-infected thymocytes
cultured with IL-2+IL-4. Studies were done to determine if synergy in
HIV expression was mediated by activation, proliferation or induction or
suppression of other cytokines. We found a higher percentage of
activated CD4+CD8+/high cells in thymocytes cultured with IL-2+IL-4 and
IL-4+IL-7 than in thymocytes cultured with IL-2+IL-7. Proliferation was
higher in thymocytes cultured with cytokine combinations but did not
correlate with those conditions showing synergy. IL-4 reduced IFN-gamma
production by thymocytes cultured with IL-2 in both HIV-infected and
non-infected thymocytes. In addition, exogenous IFN-gamma decreased p24
expression by HIV-infected thymocytes when cultured with IL-4 alone,
with IL-2+IL-4 or IL-4+IL-7. These results suggest that suppression of
IFN-gamma by IL-4 may combine with cell activation and proliferation to
produce synergy of virus expression observed with IL-2+IL-4 and
IL-4+IL-7.
DE Aging/IMMUNOLOGY Cells, Cultured Child Cytokines/*PHARMACOLOGY
Dactinomycin/ANALOGS & DERIVATIVES/PHARMACOLOGY Fetal
Development/IMMUNOLOGY Fetus Gestational Age Granulocyte-Macrophage
Colony-Stimulating Factor/PHARMACOLOGY Human HIV Core Protein
p24/ANALYSIS/BIOSYNTHESIS HIV-1/DRUG EFFECTS/*PHYSIOLOGY
Interferon-gamma, Recombinant/PHARMACOLOGY Interleukin-1/PHARMACOLOGY
Interleukin-4/PHARMACOLOGY Interleukin-6/PHARMACOLOGY
Interleukin-7/PHARMACOLOGY Interleukins/*PHARMACOLOGY Kinetics
Lymphocyte Transformation/DRUG EFFECTS Recombinant
Proteins/PHARMACOLOGY Support, Non-U.S. Gov't Support, U.S. Gov't,
P.H.S. T-Lymphocytes/DRUG EFFECTS/IMMUNOLOGY/*VIROLOGY Tumor Necrosis
Factor/PHARMACOLOGY Virus Replication/DRUG EFFECTS/*PHYSIOLOGY JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).