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- Document 0720
- DOCN M9620720
- TI Human immunodeficiency virus type 1 infection of CD4+ T cells
- down-regulates the expression of CD28: effect on T cell activation and
- cytokine production.
- DT 9602
- AU Haffar OK; Smithgall MD; Wong JG; Bradshaw J; Linsley PS; Bristol-Myers
- Squibb Pharmaceutical Research Institute, Seattle,; Washington 98121,
- USA.
- SO Clin Immunol Immunopathol. 1995 Dec;77(3):262-70. Unique Identifier :
- AIDSLINE MED/96080354
- AB Infection with human immunodeficiency virus type 1 (HIV-1) results in
- dysregulation of normal T cell function. To study the effects of HIV-1
- at the cellular level, primary T cell lines were generated by
- alloantigen stimulation of CD4+ T cells collected from peripheral blood
- of HIV-1-infected donors. Using Epstein-Barr virus-infected B
- lymphocytes (EBV-LCL) as a source of alloantigen, the T cell lines were
- expanded in vitro for 7 weeks. Uninfected T cell lines were cultured in
- parallel. Virus was inducible from the infected lines with stimulation,
- and complete infection was achieved after 4-7 weeks depending on the
- line. The down-modulation of CD28 expression correlated with virus
- replication and spread. Furthermore, CD28 mRNA was not inducible in the
- infected lines after stimulation with alloantigen. Loss of CD28
- correlated with reduced responsiveness to costimulation with a
- monoclonal antibody to CD28 following similar engagement of the CD3
- protein. In contrast, activation with alloantigen was not affected.
- HIV-1 infection and down-modulation of CD28 did not alter the relative
- levels of IL-2, IFN-gamma, and IL-4 mRNA. Production of the various
- cytokine mRNAs following alloantigen stimulation was inhibited by
- CTLA4Ig and thus remained under the regulation of CD80 and CD86
- expressed on the EBV-LCL. Taken together, our data suggest that
- dysregulation of normal T cell function associated with HIV-1 infection
- may result in part form the loss of CD28 expression.
- DE Antigens, CD28/*BIOSYNTHESIS/GENETICS Cell Line, Transformed
- Cytokines/*BIOSYNTHESIS CD4-Positive
- T-Lymphocytes/IMMUNOLOGY/METABOLISM/*VIROLOGY Down-Regulation
- (Physiology)/*PHYSIOLOGY Human HIV Infections/IMMUNOLOGY
- HIV-1/*IMMUNOLOGY Lymphocyte Transformation/IMMUNOLOGY RNA,
- Messenger/ANALYSIS JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-