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M94A3153.TXT
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1994-10-25
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Document 3153
DOCN M94A3153
TI Superantigen TSST-1 enhances the replication of HIV-1 in PBMCs through
selective activation of CD4+ T-cell and induction of TNF-alpha.
DT 9412
AU Hashimoto K; Baba M; Shigeta S; Department of Microbiology, Fukushima
Medical College, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):140 (abstract no. PA0179). Unique
Identifier : AIDSLINE ICA10/94369422
AB OBJECTIVE: Staphylococcal superantigens bind to the class II molecules
expressed on the surface of peripheral blood mononuclear cells (PBMCs)
and potently activate them. Tumor necrosis factor alpha (TNF-alpha)
plays an essential role in human immunodeficiency virus type 1(HIV-1)
infection. In addition, the superantigen has recently been reported to
activate the gene expression of TNF-alpha and induce its secretion in
PBMCs. We investigated the effect of the superantigen toxic shock
syndrome toxin-1(TSST-1) on HIV-1 replication in PBMCs. METHODS: PBMCs
were obtained from healthy donors, infected with HIV-1, and cultured in
the presence of various concentrations of TSST-1. To some cultures,
various diluted anti-TNF-alpha antibodies were added. After cultivation
under various conditions, the culture supernatants were collected and
examined for their p24 antigen and TNF-alpha levels.
Fluorescent-activated cell sorter analysis and DNA synthesis were also
determined. RESULTS: The p24 antigen level in the culture supernatant
markedly increased in the presence of TSST-1 at a concentration of 1
pg/ml or higher. TSST-1 specifically activated CD4+ T lymphocytes.
Significant production of TNF-alpha was observed in HIV-1-infected PBMCs
at 96h after incubation with TSST-1. Furthermore, addition of
anti-TNF-alpha antibody in culture medium resulted in dramatical
decrease of HIV-1 replication. CONCLUSIONS: The enhanced production of
HIV-1 by TSST-1 in PBMCs is in part attributed to both the activation of
CD4+ T lymphocytes and induction of TNF-alpha.
DE Cells, Cultured Comparative Study Dose-Response Relationship, Drug
DNA/BIOSYNTHESIS Enterotoxins/*PHARMACOLOGY Flow Cytometry/METHODS
Human HIV Core Protein p24/ANALYSIS/BIOSYNTHESIS HIV-1/DRUG
EFFECTS/*PHYSIOLOGY Kinetics Lymphocyte Transformation/*DRUG EFFECTS
Lymphocytes/DRUG EFFECTS/IMMUNOLOGY/*MICROBIOLOGY Staphylococcus aureus
Superantigens/*PHARMACOLOGY Time Factors Tumor Necrosis
Factor/*BIOSYNTHESIS T4 Lymphocytes/DRUG
EFFECTS/IMMUNOLOGY/*MICROBIOLOGY Virus Replication/*DRUG EFFECTS
MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).