title: Inhibition of adherence of Actinomyces naeslundii (Actinomyces viscosus) T14V-J1 to saliva-treated hydroxyapatite by a monoclonal antibody to type 1 fimbriae.
abstract: A monoclonal antibody to Actinomyces naeslundii (A. viscosus) T14V-J1 type 1 fimbriae, capable of inhibiting the adherence of this bacterium to salivary proline-rich protein-treated hydroxyapatite, was generated by immunization of SWR mice with A. naeslundii 55-19, a strain derived from T14V-J1 that possess only type 1 fimbriae. Supernatants of hybridomas were screened for reactivity with purified type 1 fimbriae. An IgG monoclonal antibody, 86-49E, blocked the adsorption of the parent strain to proline-rich protein-treated hydroxyapatite by 77% with 1.0 microgram/ml of the monoclonal antibody; the Fab fragment derived from this monoclonal antibody inhibited adherence by 38% at the same concentration. Similarly, the adherence of strain 55-19 was inhibited by 100% and 64% to proline-rich protein-treated hydroxyapatite with 1.0 micrograms/ml of IgG and Fab fragments respectively. Control monoclonal antibody to the subunit of type 1 fimbriae, as well as to Actinobacillus actinomycetemcomitans caused only minimal adherence inhibition. Monoclonal antibody 86-49E also agglutinated both type 1 fimbriae-bearing strains of A. naeslundii T14V-J1 and 55-19 but not strains 59-51 and 147, which lack type 1 fimbriae. Further confirmation of the specificity of monoclonal antibody 86-49E was obtained using these fimbria-deficient mutant strains in an enzyme-linked immunosorbent assay, with the monoclonal antibody binding only to strains possessing type 1 fimbriae. Immunogold labeling in conjunction with electron microscopy suggested binding of monoclonal antibody 86-49E occurring near the distal end of the fimbriae. In contrast, when a monoclonal antibody specific for the type 1 fimbrial subunit but not capable of adherence inhibition was used together with 86-49E in double-labeling experiments, extensive labeling of the fimbriae by the subunit antibody was noted. These data suggest that a monoclonal antibody specific for the type 1 fimbriae of A. naeslundii that is capable of binding to a discrete site on the fimbriae has the capacity to inhibit the adsorption of this organism to saliva-treated hydroxyapatite.
authors.affiliation: Department of Oral Biology, College of Dentistry, University of Florida, Gainesville 32610, USA.
authors.forename: W E
authors.initials: WE
authors.lastname: Nesbitt
authors.forename: J E
authors.initials: JE
authors.lastname: Beem
authors.forename: K P
authors.initials: KP
authors.lastname: Leung
authors.forename: S
authors.initials: S
authors.lastname: Stroup
authors.forename: R
authors.initials: R
authors.lastname: Swift
authors.forename: W P
authors.initials: WP
authors.lastname: McArthur
authors.forename: W B
authors.initials: WB
authors.lastname: Clark
mesh_terms: D016924:Actinomyces viscosus / Q000145:classification / Q000276:immunology / Q000502:physiology*; D018829:Adhesins, Bacterial; D000818:Animals; D000907:Antibodies, Bacterial / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D001422:Bacterial Adhesion / Q000276:immunology*; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology; D017886:Durapatite; D005260:Female; D010861:Fimbriae, Bacterial / Q000276:immunology* / Q000648:ultrastructure; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D007074:Immunoglobulin G / Q000276:immunology; D007150:Immunohistochemistry; D051379:Mice; D008815:Mice, Inbred Strains; D008854:Microscopy, Electron; D011485:Protein Binding; D012463:Saliva / Q000502:physiology
chemical_list: D018829:Adhesins, Bacterial; D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D001425:Bacterial Outer Membrane Proteins; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D017886:Durapatite