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1996-03-09
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Document 0428
DOCN M9650428
TI Mechanisms for the transendothelial migration of HIV-1-infected
monocytes into brain.
DT 9605
AU Nottet HS; Persidsky Y; Sasseville VG; Nukuna AN; Bock P; Zhai QH;
Sharer LR; McComb RD; Swindells S; Soderland C; Gendelman HE; Department
of Pathology, Eppley Institute for Cancer and Allied; Disease,
University of Nebraska Medical Center, Omaha 68198, USA.
SO J Immunol. 1996 Feb 1;156(3):1284-95. Unique Identifier : AIDSLINE
MED/96144356
AB HIV-1 penetration of the brain is a pivotal event in the
neuropathogenesis of AIDS-associated dementia. The establishment of
productive viral replication or up-regulation of adhesion molecule
expression on brain microvascular endothelial cells (BMVEC) could permit
entry of HIV into the central nervous system. To investigate the
contribution of both, we inoculated primary human BMVEC with high titer
macrophage-tropic HIV-1 or cocultured them with virus-infected
monocytes. In both instances, BMVEC failed to demonstrate productive
viral replication. Cell to cell contact between monocytes and
microvascular endothelium resulted in E-selectin expression on BMVEC.
BMVEC. cocultured with LPS-activated HIV-infected monocytes expressed
even higher levels of E-selectin and vascular cell adhesion molecule-1
(VCAM-1). Transwell assays supported a role of soluble factors, from
virus-infected monocytes, for the induction of adhesion molecules on
BMVEC. To verify the in vivo relevance of these findings, levels of
adhesion molecules were compared with those of proinflammatory cytokines
and HIV-1 gene products in brain tissue of AIDS patients with or without
encephalitis and HIV-seronegative controls. E-Selectin, and to a lesser
degree VCAM-1, paralleled the levels of HIV-1 gene products and
proinflammatory cytokines in brain tissue of subjects with encephalitis.
Most importantly, an association between macrophage infiltration and
increased endothelial cell adhesion molecules was observed in
encephalitic brains. Monocyte binding to encephalitic brain tissue was
blocked with Abs to VCAM-1 and E-selectin. These data, taken together,
suggest that HIV entry into brain is, in part, a consequence of the
ability of virus-infected and immune-activated monocytes to induce
adhesion molecules on brain endothelium.
DE Base Sequence Brain/BLOOD SUPPLY/*VIROLOGY Cell Adhesion Cell
Movement/*IMMUNOLOGY Cells, Cultured E-Selectin/BIOSYNTHESIS/DRUG
EFFECTS Endothelium, Vascular/*METABOLISM Human HIV
Infections/ETIOLOGY/IMMUNOLOGY/PATHOLOGY HIV-1/*PATHOGENICITY
Macrophage Activation Molecular Sequence Data
Monocytes/IMMUNOLOGY/*VIROLOGY Support, Non-U.S. Gov't Support, U.S.
Gov't, P.H.S. Vascular Cell Adhesion Molecule-1/BIOSYNTHESIS/DRUG
EFFECTS/ IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).