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Journal of Virology, September 2003, p. 9943-9950, Vol. 77, No. 18
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.18.9943-9950.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Efficient Isolation of Wild Strains of Canine Distemper Virus in Vero Cells Expressing Canine SLAM (CD150) and Their Adaptability to Marmoset B95a Cells

Fumio Seki,1 Nobuyuki Ono,1 Ryoji Yamaguchi,2 and Yusuke Yanagi1*

Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka 812-8582,1 Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2192, Japan2

Received 22 May 2003/ Accepted 19 June 2003

We have previously shown that canine signaling lymphocyte activation molecule (SLAM; also known as CD150) acts as a cellular receptor for canine distemper virus (CDV). In this study, we established Vero cells stably expressing canine SLAM (Vero.DogSLAMtag cells). Viruses were isolated in Vero.DogSLAMtag cells one day after inoculation with spleen samples from five out of seven dogs with distemper. By contrast, virus isolation with reportedly sensitive marmoset B95a cells was only successful from three diseased animals at 7 to 10 days after inoculation, and no virus was recovered from any dogs when Vero cells were used for isolation. The CDV strain isolated in Vero.DogSLAMtag cells did not cause cytopathic effects in B95a and human SLAM-expressing Vero cells, whereas the strain isolated in B95a cells from the same dog did so in canine or human SLAM-expressing Vero cells as well as B95a cells. There were two amino acid differences in the hemagglutinin sequence between these strains. Cell fusion analysis after expression of envelope proteins and vesicular stomatitis virus pseudotype assay showed that their hemagglutinins were responsible for the difference in cell tropism between them. Site-directed mutagenesis indicated that glutamic acid to lysine substitution at position 530 of the hemagglutinin was required for the adaptation to the usage of marmoset SLAM. Our results indicate that Vero cells stably expressing canine SLAM are highly sensitive to CDV in clinical specimens and that only a single amino acid substitution in the hemagglutinin can allow the virus to adapt to marmoset SLAM.

* Corresponding author. Mailing address: Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka 812-8582, Japan. Phone: 81-92-642-6135. Fax: 81-92-642-6140. E-mail: yyanagi{at}virology.med.kyushu-u.ac.jp.

Journal of Virology, September 2003, p. 9943-9950, Vol. 77, No. 18
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.18.9943-9950.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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