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M94B0783.TXT
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1994-11-11
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Document 0783
DOCN M94B0783
TI The endothelium in HIV-associated Kaposi's sarcoma.
DT 9412
AU Corbeil J; Univ. of New South Wales, Australia
SO Diss Abstr Int [B]; 54(6):3004 1993. Unique Identifier : AIDSLINE
ICDB/94605793
AB The aim of this project was to culture Kaposi's sarcoma-derived (KS)
cells in order to investigate its etiology and attempt to elucidate the
role of the vascular endothelial cell (EC) in this pathological process.
The establishment of five cell cultures derived from pleural or
peritoneal fluid of HIV-infected individuals with KS, and one without,
are described. These cells originate from vascular endothelium since
specific staining for EC markers and the secretion of endothelin, a
vascular EC product were demonstrated. The KS-derived cells secreted
large amounts of cytokines (GM-CSF, TNF-alpha, IL-1 beta and especially
IL-6). Conditioned media from the KS-derived cells prompted normal
capillary EC to proliferate. The KS-derived cells synthesized fibroblast
growth factor (FGF)-like molecules in amounts sufficient to induce the
proliferation of normal EC and fibroblasts. These data support the
existence of a paracrine pathway of EC proliferation in KS and suggest
that KS-derived cells could sustain their own growth via an autocrine
mechanism. Furthermore, we studied the effect of in vitro infection of
vascular EC with HIV-1. Low levels of viral antigen ranging from 30 to
225 pg/mL were demonstrated and the expression was transient. Immunogold
electron microscopy using monoclonal antibodies specific for p18, p24
and gp41 showed the presence of HIV. Levels of IL-6 were increased at
day 3 of the infection compared to EC inoculated with Hut78 supernatant
or DEAE-dextran treated EC. These results are the first description that
EC can be productively infected in vitro and that viral infection of EC
induces the production of IL-6. The relationship between the
HIV-infection of EC and KS cells secretory capability could possibly
lead us to a clearer picture of the neopathogenesis of KS. (Full text
NOT AVAILABLE FROM UNIVERSITY MICROFILMS INT'L.)
DE Acquired Immunodeficiency Syndrome/*COMPLICATIONS Cell Division
Culture Media, Conditioned Cytokines/SECRETION Endothelium,
Vascular/MICROBIOLOGY/*PATHOLOGY/SECRETION HIV-1/ISOLATION & PURIF
Microscopy, Electron Sarcoma, Kaposi's/*ETIOLOGY/PATHOLOGY Tumor
Cells, Cultured THESIS
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).