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J. Virol., 10 1996, 6673-6681, Vol 70, No. 10
B Horvat, P Rivailler, G Varior-Krishnan, A Cardoso, D Gerlier and C Rarourdin- Combe
We have generated transgenic mice ubiquitously expressing the human
receptor for measles virus (MV), CD46 (membrane cofactor protein). Various
cell types were isolated from these transgenic mice and analyzed for their
ability to support MV replication in vitro. Although MV could enter into
all CD46-expressing cells, differential susceptibilities to MV infection
were detected depending on the cell type. Cell cultures obtained from
transgenic lungs and kidneys were found to be permissive of MV infection,
since RNA specific for MV genes was detected and viral particles were
released, although at a low level. Similarly to human lymphocytes,
activated T and B lymphocytes isolated from transgenic mice could support
MV replication; virus could enter, transcribe viral RNA, and produce new
infectious particles. When expressing viral proteins, lymphocytes
down-regulated CD46 from the surface. Interestingly, while activated T
lymphocytes from nontransgenic mice did not support MV infection, activated
nontransgenic murine B lymphocytes replicated MV as well as transgenic B
lymphocytes, suggesting the use of an alternative virus receptor for entry.
In contrast to the previous cell types, murine peritoneal and bone
marrow-derived macrophages, regardless of whether they were activated,
could not support MV replication. Furthermore, although MV entered into
macrophages and virus-specific RNA transcription occurred, no virus protein
or infectious virus particles could be detected. These results show the
importance of the particular cell-type-specific host factors for MV
replication in murine cells which may be responsible for the differential
permissivity of MV infection.
Copyright © 1996, American Society for Microbiology
Transgenic mice expressing human measles virus (MV) receptor CD46 provide cells exhibiting different permissivities to MV infections
Laboratoire d'Immunobiologie Moleculaire, Ecole Normale Superieure deLyon, UMR 49, CNRS, France.
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