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1996-02-27
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Document 0597
DOCN M9630597
TI Costimulation of CD4+ T cells via CD28 modulates human immunodeficiency
virus type 1 infection and replication in vitro.
DT 9603
AU Smithgall MD; Wong JG; Linsley PS; Haffar OK; Bristol-Myers Squibb
Pharmaceutical Research Institute, Seattle,; Washington 98121, USA.
SO AIDS Res Hum Retroviruses. 1995 Aug;11(8):885-92. Unique Identifier :
AIDSLINE MED/96020089
AB Stimulation of human immunodeficiency virus type 1 (HIV-1)-infected
donor peripheral blood mononuclear cells (PBMCs) via the TCR-CD3 complex
induces HIV-1 production in vitro (Zarling JM, et al.: Nature [London]
1990;347:92; Haffar OK, et al.: J Virol 1992;66:4279; Moran PM, et al.:
AIDS Res Hum Retroviruses 1993;9:455). However, in addition to the
primary stimulatory signal delivered through the TCR-CD3 complex,
optimal T cell activation requires secondary or costimulatory signals
delivered via various T cell accessory proteins (Alton A, et al.: Adv
Immunol 1990;48:227). In this article we explore the role of
costimulation of T cells via CD28 in HIV-1 replication. Ligation of CD28
with either a CD28-specific MAb or by coculture of PBMCs with Chinese
hamster ovary (CHO) cell lines stably expressing either of the CD28
counterreceptors, B7-1 (CD80) or B7-2 (CD86), concomitant with
stimulation via CD3, results in increased virus replication compared to
stimulation via CD3 alone. CD28 ligation also augments de novo infection
of CD3-stimulated seronegative donor PBMCs with cell-free virus.
Increased virus replication following CD28 ligation is not solely
attributed to increased levels of endogenous IL-2, because addition of
an anti-IL-2-neutralizing antibody only partially inhibits the response.
In contrast, interfering with the interaction between CD28 and its
counterreceptors on antigen-presenting cells (APCs) using CTLA4Ig
effectively inhibits virus replication. At high concentrations CTLA4Ig
also reduces cell proliferation. These in vitro results suggest that
CD28 plays a central role in HIV-1 replication and that interfering with
the CD28 costimulatory pathway may modify the course of HIV-1 infection.
DE Animal Antigens, CD28/*PHYSIOLOGY Antigens, CD3/PHYSIOLOGY Coculture
CD4-Positive T-Lymphocytes/PHYSIOLOGY/*VIROLOGY CHO Cells Hamsters
Human HIV Infections/*VIROLOGY HIV-1/*PHYSIOLOGY Signal Transduction
Virus Replication/*PHYSIOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).