1887

Abstract

The ability of eight neutralizing monoclonal antibodies (MAbs) specific for structural proteins of murine cytomegalovirus (MCMV) to protect mice passively against MCMV infection was examined to determine firstly whether a correlation existed between the neutralization titres of the MAbs and the protection afforded by the MAbs and, secondly, the contribution of the host towards neutralization by the MAbs . The reduction in MCMV titre in the livers of BALB/c and C57BL/10 mice by the MAbs closely correlated with their neutralization titres . However, in the spleens of BALB/c mice, in which MCMV replicates to high titre, almost all of the MAbs tested were ineffective in reducing MCMV replication. Indeed, a significant increase in splenic MCMV replication was observed in mice treated 24 h prior to MCMV replication with either neutralizing MAbs or polyclonal Ig. Each of six MAbs prophylactically protected between 66 and 100% of mice from an intraperitoneal challenge with 4 LD MCMV regardless of their neutralization titre . The persistence of MCMV replication in the salivary gland was not prevented by either polyclonal Ig or MAbs. Despite the absolute requirement for complement for the neutralization of MCMV , both polyclonal Ig and MAb 4F9 protected A/J mice, which are deficient in the fifth component of complement, as efficiently as they did complement competent BALB/c mice. These results demonstrate that MAbs specific for single MCMV polypeptides are protective . In addition, the extent to which the MAbs protected against MCMV could not be predicted from their immunoreactive or neutralizing titres or by their effect on splenic MCMV replication . Furthermore, these studies suggest that the mechanism(s) of neutralization of MCMV are different to those which act .

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/content/journal/jgv/10.1099/0022-1317-72-1-149
1991-01-01
2019-11-18
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http://instance.metastore.ingenta.com/content/journal/jgv/10.1099/0022-1317-72-1-149
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