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J. Virol., Jan 1997, 42-49, Vol 71, No. 1
S Loffler, F Lottspeich, F Lanza, DO Azorsa, V ter Meulen and J Schneider- Schaulies
Canine distemper virus (CDV), a lymphotropic and neurotropic negative-
stranded RNA virus of the Morbillivirus genus, causes a life- threatening
disease in several carnivores, including domestic dogs. To identify the
cellular receptor(s) involved in the uptake of CDV by susceptible cells, we
isolated a monoclonal antibody (MAb K41) which binds to the cell surface
and inhibits the CDV infection of several cell lines from various species.
Pretreatment of cells with MAb K41 reduces the number of infectious centers
and the size of the syncytia. Using affinity chromatography with MAb K41,
we purified from HeLa and Vero cell extracts a 26-kDa protein which
contained the amino acid sequence TKDEPQRETLK of human CD9, a member of the
tetraspan transmembrane or transmembrane 4 superfamily of cell surface
proteins. Transfection of NIH 3T3 or MDBK cells with a CD9 expression
plasmid rendered these cells permissive for viral infection and raised
virus production by a factor of 10 to 100. The mechanism involved is still
unclear, since we were unable to detect direct binding of CDV to CD9 by
using immunoprecipitation and a virus overlay protein binding assay. These
findings indicate that human CD9 and its homologs in other species are
necessary factors for the uptake of CDV by target cells, the formation of
syncytia, and the production of progeny virus.
Copyright © 1997, American Society for Microbiology
CD9, a tetraspan transmembrane protein, renders cells susceptible to canine distemper virus
Institut fur Virologie und Immunbiologie, Wurzburg, Germany.
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