title: Novel monoclonal antibodies broadly reactive to human recombinant sapovirus-like particles.
abstract: Sapovirus (SaV), a member of the family Caliciviridae, is an important cause of acute epidemic gastroenteritis in humans. Human SaV is genetically and antigenically diverse and can be classified into four genogroups (GI, GII, GIV, and GV) and 16 genotypes (7 GI [GI.1-7], 7 GII, [GII.1-7], 1 GIV and 1 GV), based on capsid sequence similarities. Monoclonal antibodies (MAbs) are powerful tools for examining viruses and proteins. PAI myeloma cells were fused with spleen cells from mice immunized with a single type of recombinant human SaV virus-like particles (VLPs) (GI.1, GI.5, GI.6, GII.3, GIV, or GV). Sixty-five hybrid clones producing MAbs were obtained. Twenty-four MAbs were characterized by ELISA, according to their cross-reactivity to each VLP (GI.1, GI.5, GI.6, GII.2, GII.3, GII.4, GII.7, GIV, and GV). The MAbs were classified by this method into: (i) MAbs broadly cross-reactive to all GI, GII, GIV and GV strains; (ii) those reactive in a genogroup-specific; and (iii) those reactive in a genotype-specific manner. Further analysis of three broadly cross-reactive MAbs with a competitive ELISA demonstrated that at least two different common epitopes are located on the capsid protein of human SaVs in the four genogroups. The MAbs generated and characterized in this study will be useful tools for further study of the antigenic and structural topography of the human SaV virion and for developing new diagnostic assays for human SaV.
authors.affiliation: School of Human Science and Environment, University of Hyogo, Hyogo 670-0092, Japan. kitamoto@shse.u-hyogo.ac.jp
authors.forename: Noritoshi
authors.initials: N
authors.lastname: Kitamoto
authors.forename: Tomoichiro
authors.initials: T
authors.lastname: Oka
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Katayama
authors.forename: Tian-Cheng
authors.initials: TC
authors.lastname: Li
authors.forename: Naokazu
authors.initials: N
authors.lastname: Takeda
authors.forename: Yoji
authors.initials: Y
authors.lastname: Kato
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Miyoshi
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Tanaka
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology* / Q000302:isolation & purification; D000914:Antibodies, Viral / Q000276:immunology* / Q000302:isolation & purification; D036022:Capsid Proteins / Q000276:immunology; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D005838:Genotype; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D029341:Sapovirus / Q000145:classification / Q000235:genetics / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000914:Antibodies, Viral; D036022:Capsid Proteins; D000939:Epitopes