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• W2140676947 abstract "ABSTRACT Identification of protective epitopes is one of the first steps in the development of a subunit vaccine. One approach to accomplishing this is to identify structures or epitopes by using monoclonal antibodies (MAb) that can attenuate infectivity in vitro and in vivo. To date attempts to use this approach with Chlamydia pneumoniae have failed. This report is the first description of a MAb directed to the lipopolysaccharide (LPS) of Chlamydia that neutralizes both in vitro and in vivo the infectivity of C. pneumoniae . MAb CP-33, an immunoglobulin G2b (IgG2b), was identified from a fusion using splenocytes from mice immunized with C. pneumoniae TW-183. By Western blot analysis, MAb CP-33 exhibited genus-specific reactivity in that it recognized the LPSs of C. pneumoniae , Chlamydia trachomatis , and Chlamydia psittaci . MAb CP-33 did not react with 15 genera of gram-negative and gram-positive bacteria and Candida albicans . By using isolated LPS of Re mutants of Escherichia coli , Salmonella enterica serovar Minnesota, and recombinants expressing the 3-deoxy- d - manno -oct-2-ulosonic acid (Kdo) transferase gene kdtA of C. trachomatis , MAb CP-33 was shown to require for binding the presence of the genus-specific trisaccharide epitope αKdo(2→8)αKdo(2→4)αKdo. By employing synthetic oligosaccharides and neoglycoconjugates in an enzyme immunoassay (EIA) and EIA inhibition, it was further shown that MAb CP-33 differed from the extensively investigated prototype chlamydial LPS MAb S25-23. Most likely, MAb CP-33 recognizes a conformational epitope in which the αKdo(2→8)αKdo(2→4)αKdo trisaccharide is an essential structural component. When tested in an in vitro neutralization assay, MAb CP-33 gave a 50% neutralization titer of 8 ng/ml against C. pneumoniae TW-183. However, this MAb did not neutralize other C. pneumoniae strains, C. trachomatis , or C. psittaci. C. pneumoniae TW-183 was treated with either MAb CP-33 or a control IgG and then used to inoculate mice by the respiratory route. Five days after inoculation, there was a difference between the mice inoculated with the control IgG-treated inoculum and those inoculated with the MAb CP-33-treated organisms as to the number of mice infected as well as the number of inclusion-forming units recovered from lung cultures ( P < 0.05). In summary, a Chlamydia -specific LPS MAb was able to neutralize in vitro the infectivity of C. pneumoniae TW-183." @default.
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• W2140676947 date "1998-08-01" @default.
• W2140676947 modified "2023-10-12" @default.
• W2140676947 title "Characterization of a Neutralizing Monoclonal Antibody Directed at the Lipopolysaccharide of <i>Chlamydia pneumoniae</i>" @default.
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• W2140676947 doi "https://doi.org/10.1128/iai.66.8.3848-3855.1998" @default.
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