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M94A3246.TXT
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1994-10-25
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Document 3246
DOCN M94A3246
TI HIV-1 infection of T cells in vitro is modulated by costimulation via
CD28.
DT 9412
AU Haffar OK; Smithgall M; Wong J; Linsley P; Bristol-Myers Squibb
Pharmaceutical Research Institute, Seattle,; Washington 98121.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):12 (abstract no. 022A). Unique
Identifier : AIDSLINE ICA10/94369329
AB OBJECTIVE: We wanted to study the role of the T cell accessory molecule
CD28 in the life cycle of HIV-1. METHODS: Peripheral blood mononuclear
cells were isolated from blood of HIV-1 infected and uninfected donors,
depleted of CD8+ T cells, and activated with a soluble anti-CD3 mAb
alone or in combination with a anti-CD28 mAb. T cell activation was
evaluated by measuring IL-2 production and proliferation. HIV-1 p24
protein levels in the culture media and levels of HIV-1 proviral DNA in
cells were used as an indices of virus production and spread. To
abrogate the co-stimulation via CD28 we used CTLA4Ig, the soluble form
of the CD28 homologue CTLA4, which binds with high avidity to both B7-1
and B7-2 on antigen presenting cells. The role of CD28 costimulation on
de novo infection of CD4+ cells with HIV-1 was addressed using the LAI
isolate. RESULTS: Co-stimulation of HIV-1 infected PBMC with soluble
anti-CD3 and anti-CD28 mAbs augmented virus production compared to
stimulation with soluble anti-CD3 mAb alone. The effect of CD28
stimulation was confirmed by coculture of the infected PBMC with a CHO
cell line stably expressing the CD28 counter receptor B7-1. Increased
virus production following engagement of CD28 could not be attributed
solely to stimulation of IL-2 production since addition of an IL-2
neutralizing mAb only partially inhibited the response. At high
concentrations CTLA4Ig inhibited IL-2 production, proliferation, and
virus production, while at low concentrations it selectively inhibited
de novo infection and virus replication. DISCUSSION AND CONCLUSIONS:
CD28-B7-1 association plays an integral role in the induction and spread
of HIV-1 in vitro. These results suggest that abrogating this
association with molecules such as CTLA4Ig may be therapeutically
beneficial.
DE Antigens, CD28/*IMMUNOLOGY Antigens, CD3/IMMUNOLOGY Human HIV Core
Protein p24/ISOLATION & PURIF HIV-1/*IMMUNOLOGY
Interleukin-2/BIOSYNTHESIS Lymphocyte Transformation T-Lymphocyte
Subsets/*MICROBIOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).