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M94A0141.TXT
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1994-10-01
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Document 0141
DOCN M94A0141
TI Upregulation of human immunodeficiency virus-1 in chronically infected
monocytic cell line by both contact with endothelial cells and
cytokines.
DT 9412
AU Fan ST; Hsia K; Edgington TS; Department of Immunology, Scripps Research
Institute, La Jolla,; CA 92037.
SO Blood. 1994 Sep 1;84(5):1567-72. Unique Identifier : AIDSLINE
MED/94348081
AB Cells of monocytic lineage (Mo) persistently infected with human
immunodeficiency virus (HIV) have been suspected to be a major reservoir
for in vivo transmission of virus to susceptible target cells. Cellular
events and mechanisms that upregulate viral gene expression in such
cells are important issues. Because the traffic of such cells is central
to biodistribution of HIV, we have explored the impact of interaction of
endothelium with HIV-1-infected U1 promonocytic cells. Coculturing of U1
with human umbilical endothelial cells (HUVEC) for 24 to 72 hours in the
absence of stimulation induced HIV-1 p24 biosynthesis significantly.
Antibody-blocking experiments indicated that CD11/CD18 integrins play a
role in upregulation of HIV expression elicited by interaction with
HUVEC. Engagement of CD11b/CD18 by adherence of U1 to surfaces coated
with either the cognate ligand fibrinogen or monoclonal antibody
specific for CD11b/CD18 also enhanced p24 biosynthesis. Furthermore,
endothelial cells were found to constitutively synthesize and secrete
soluble factors that enhanced HIV-1 synthesis. The enhancing factors, of
estimated size 10 to 45 kD, were induced in HUVEC to high levels by
monokines or by lipopolysaccharide, resulting in markedly enhanced HIV-1
expression by U1. These endothelial cell-derived HIV-1-enhancing factors
consist of, among others, interleukin-6 (IL-6), IL-1 beta, and
granulocyte-macrophage CSF (GM-CSF). Our results suggest that activation
of HIV biosynthesis in infected Mo via interaction with endothelium may
impact significantly on the tissue distribution and pathogenesis of HIV
infections.
DE Antibodies, Monoclonal/PHARMACOLOGY Antigens, CD/IMMUNOLOGY Cell Line
Cells, Cultured Comparative Study Cytokines/*PHARMACOLOGY
Endothelium, Vascular/*PHYSIOLOGY Granulocyte-Macrophage
Colony-Stimulating Factor/PHARMACOLOGY Human HIV Core Protein
p24/BIOSYNTHESIS HIV-1/DRUG EFFECTS/*PHYSIOLOGY
Interleukin-6/PHARMACOLOGY Kinetics Lipopolysaccharides/PHARMACOLOGY
Monocytes Support, U.S. Gov't, P.H.S. Time Factors Tumor Cells,
Cultured Tumor Necrosis Factor/PHARMACOLOGY Umbilical Veins *Virus
Replication/DRUG EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).