title: Neutralization of Chlamydia psittaci with monoclonal antibodies.
abstract: Neutralization of Chlamydia (C.) psittaci avian strain P-1041 was examined in vitro using monoclonal antibodies (MAbs). Of the 10 MAbs used, 6 were found to exhibit neutralizing capability. These include 3 against major outer membrane protein (MOMP), 1 against lipopolysaccharide (LPS) and 2 against other protein molecules [90 kilodalton (kDa) and 90/50 kDa]. Most neutralizing MAbs were dependent on complement for efficient neutralization, while a strain-specific MAb (2B5) against the 90 kDa protein displayed a different requirement for complement and neutralized the infectivity of the P-1041 at high concentrations without complement. By competitive inhibition enzyme-linked immunosorbent assay (competitive inhibition ELISA), all 3 neutralizing anti-MOMP MAbs were demonstrated to recognize different epitopes found in very close proximity to each other on the outer membrane.
authors.affiliation: Department of Veterinary Public Health, Faculty of Veterinary Medicine, Hokkaido University, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ando
authors.forename: I
authors.initials: I
authors.lastname: Takashima
authors.forename: N
authors.initials: N
authors.lastname: Hashimoto
mesh_terms: D000907:Antibodies, Bacterial / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology*; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D001667:Binding, Competitive; D002691:Chlamydophila psittaci / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes; D008070:Lipopolysaccharides / Q000276:immunology*; D009500:Neutralization Tests
chemical_list: D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D001425:Bacterial Outer Membrane Proteins; D000939:Epitopes; D008070:Lipopolysaccharides