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1996-03-09
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Document 0135
DOCN M9650135
TI In vitro culture of human peripheral blood monocytes induces hyaluronan
binding and up-regulates monocyte variant CD44 isoform expression.
DT 9605
AU Levesque MC; Haynes BF; Department of Medicine, Duke University Medical
Center, Durham,; NC 27710, USA.
SO J Immunol. 1996 Feb 15;156(4):1557-65. Unique Identifier : AIDSLINE
MED/96164586
AB CD44 is a cell surface proteoglycan homologous to cartilage link protein
that serves as a receptor for hyaluronan (HA). CD44 isoforms include an
unspliced 80- to 90-kDa standard form (CD44S) and isoforms derived from
alternative splicing of nine CD44 variant exons (CD44V). Ligation of
CD44 isoforms on monocytes induces the production of IL-1 and TNF-alpha.
In addition, CD44 mAbs and HA inhibit HIV infection of monocytes by
monocytotropic HIV, but do not inhibit T cell tropic HIV infectivity of
T cells. To determine the ability of PB lymphocytes and monocytes to
bind HA and to define and compare CD44 isoforms present on PB monocytes
and lymphocytes, we studied PBMC using a panel of CD44 mAbs, HA-FITC,
flow cytometry, and Western blot analysis. We found that freshly
isolated PB monocytes and lymphocytes did not bind soluble HA. However,
in vitro culture of PBMC for 8 to 16 h resulted in CD44-dependent
HA-FITC binding to monocytes, but not to lymphocytes. Western blot and
flow cytometry analyses using CD44 mAbs demonstrated selective
expression of high m.w. CD44V isoforms on cultured monocytes, but not on
lymphocytes. Finally, tissue macrophages and multinucleated giant cells
from patients with inflammatory lesions expressed CD44V6- and
CD44V9-containing CD44 isoforms in vivo, suggesting that CD44V
expression is associated with differentiation of monocytes to tissue
macrophages in vivo in inflammatory sites. Taken together, our data
demonstrate that PB monocytes, but not T or B lymphocytes, acquire the
ability to bind HA and up-regulate CD44V expression after in vitro
culture.
DE Antigens, CD3/PHARMACOLOGY Antigens, CD44/CHEMISTRY/*METABOLISM Cells,
Cultured Flow Cytometry Fluorescent Antibody Technique, Indirect
Human Hyaluronic Acid/*METABOLISM Lymphocytes/METABOLISM
Monocytes/*METABOLISM Phytohemagglutinins/PHARMACOLOGY Support, U.S.
Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).