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J. Exp. Med.,
Volume 187, Number 11, June 1, 1998 1921-1926
By


From the * Imperial College School of Medicine, National Heart and Lung Institute at St. Mary's,
London, W2 1PG United Kingdom; and the In a murine model of respiratory syncytial virus disease, prior sensitization to the attachment
glycoprotein (G) leads to pulmonary eosinophilia and enhanced illness. Three different approaches were taken to dissect the region of G responsible for enhanced disease and protection
against challenge. First, mutant viruses, containing frameshifts that altered the COOH terminus
of the G protein, were used to challenge mice sensitized by scarification with recombinant vaccinia virus (rVV) expressing wild-type G. Second, cDNA expressing these mutated G proteins
were expressed by rVV and used to vaccinate mice before challenge with wild-type respiratory
syncytial virus (RSV). These studies identified residues 193-205 to be responsible for G-induced
weight loss and lung eosinophilia and showed that this region was not was not necessary for induction of protective immunity. Third, mice were sensitized using an rVV that expressed only
amino acids 124-203 of the G protein. Upon RSV challenge, mice sensitized with this rVV
developed enhanced weight loss and eosinophilia. This is the first time that a region within
RSV (amino acids 193-203) has been shown to be responsible for induction of lung eosinophilia and disease enhancement. Moreover, we now show that it is possible to induce protective immunity with an altered G protein without inducing a pathological response.
Centro Nacional de Biologìa Celular y Retrovirus,
Instituto de Salud `Carlos III', Majadahonda, 28220, Madrid, Spain
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