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Journal of Virology, August 2000, p. 7554-7561, Vol. 74, No. 16
Institut für Virologie und
Immunbiologie, D-97078 Würzburg, Germany1;
Institut für Tierneurologie, CH-3012 Bern,
Switzerland2; and School of Biology and
Biochemistry, The Queen's University of Belfast, Belfast BT9 7BL,
United Kingdom3
Received 28 March 2000/Accepted 17 May 2000
Canine distemper virus (CDV) causes a life-threatening disease in
several carnivores including domestic dogs. Recently, we identified a
molecule, CD9, a member of the tetraspan transmembrane protein family,
which facilitates, and antibodies to which inhibit, the infection of
tissue culture cells with CDV (strain Onderstepoort). Here we describe
that an anti-CD9 monoclonal antibody (MAb K41) did not interfere with
binding of CDV to cells and uptake of virus. In addition, in
single-step growth experiments, MAb K41 did not induce differences in
the levels of viral mRNA and proteins. However, the virus release of
syncytium-forming strains of CDV, the virus-induced cell-cell fusion in
lytically infected cultures, and the cell-cell fusion of uninfected
with persistently CDV-infected HeLa cells were strongly inhibited by
MAb K41. These data indicate that anti-CD9 antibodies selectively block
virus-induced cell-cell fusion, whereas virus-cell fusion is not affected.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Antibodies to CD9, a Tetraspan Transmembrane Protein, Inhibit
Canine Distemper Virus-Induced Cell-Cell Fusion but Not
Virus-Cell Fusion
*
Corresponding author. Mailing address: Institut
für Virologie und Immunbiologie, Versbacher Str. 7, D-97078
Würzburg, Germany. Phone: 49-931-2015954. Fax: 49-931-2013934. E-mail: termeulen{at}vim.uni-wuerzburg.de.
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