Abstract
The role of secretory antibody in protection against respiratory syncytial virus (RSV) infection was examined by using monoclonal immunoglobulin A (IgA) antibody for intranasal passive immunization of mice. Eight anti-RSV IgA hybridomas were produced by fusing myeloma cells with lung lymphocytes from RSV-immunized mice. Five IgA antibodies recognized RSV strains of both the A and the B subgroups, and two of these neutralized virus in a plaque reduction assay. Monoclonal IgA antibody HNK20, which bound to F glycoprotein, was most effective, reducing plaques by 50% at a concentration of 0.1 microgram/ml for both subgroup A and subgroup B strains. HNK20 also neutralized all of eight clinical isolates of RSV tested. When delivered intranasally to mice 24 h prior to RSV challenge, HNK20 reduced virus titers in the lungs by nearly 100-fold. Maximal protection occurred at a dose of 0.5 mg/kg of body weight. Significant protection against lung infection was seen when the interval between antibody treatment and challenge was as long as 72 h. HNK20 also decreased virus titers in the nose approximately 10-fold when given 1 h, but not 24 h, before challenge. When mice were treated with HNK20 intranasally 3 days after challenge, viral titers were reduced in the lungs but not the nose. The results indicate that topical application of relatively small amounts of monoclonal IgA can protect against both upper and lower respiratory tract infections caused by RSV.
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