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Unité d'Immunologie et Stratégie Vaccinale, Institut Pasteur de Lyon, Avenue Tony-Gernier, 69365 Lyon, Cedex 07, France
We have studied the induction of the cytotoxic T lymphocyte (CTL) response to measles virus (MV) antigens expressed as vaccinia virus (VV) recombinants in a murine model. In C3H mice (H-2k) only the nucleoprotein (NP) induced a CTL response and this was shown to be cross-reactive with the closely related canine distemper virus (CDV). The presentation of this antigen was shown to be Kk-restricted. In BALB/c mice (H-2d), both the haemagglutinin (HA) and the NP induced a strong CTL response, the former being serotype-specific, whereas the latter cross-reacted with CDV. Both responses were found to be Ld-restricted. Based on the prediction for Ld T cell motifs, we tested a number of MV NP-derived nonapeptides for their capacity to sensitize P815 cells (H-2d) for lysis by spleen cells from VV-NP-immunized mice. One of these peptides, comprising amino acids 281 to 289 (Tyr-Pro-Ala-Leu-Gly-Leu-His-Glu-Phe) was as effective as cells expressing the complete NP protein. This motif is conserved in the CDV NP.
Received 19 April 1993;
accepted 7 July 1993.
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