title: Novel Antibodies Reactive with Sialyl Lewis X in Both Humans and Mice Define Its Critical Role in Leukocyte Trafficking and Contact Hypersensitivity Responses.
abstract: Sialyl Lewis X (sLe(x)) antigen functions as a common carbohydrate determinant recognized by all three members of the selectin family. However, its expression and function in mice remain undefined due to the poor reactivity of conventional anti-sLe(x) monoclonal antibodies (mAbs) with mouse tissues. Here, we developed novel anti-sLe(x) mAbs, termed F1 and F2, which react well with both human and mouse sLe(x), by immunizing fucosyltransferase (FucT)-IV and FucT-VII doubly deficient mice with 6-sulfo-sLe(x)-expressing cells transiently transfected with an expression vector encoding CMP-N-acetylneuraminic acid hydroxylase. F1 and F2 specifically bound both the N-acetyl and the N-glycolyl forms of sLe(x) as well as 6-sulfo-sLe(x), a major ligand for L-selectin expressed in high endothelial venules, and efficiently blocked physiological lymphocyte homing to lymph nodes in mice. Importantly, both of the mAbs inhibited contact hypersensitivity responses not only when administered in the L-selectin-dependent sensitization phase but also when administered in the elicitation phase in mice. When administered in the latter phase, F1 and F2 efficiently blocked rolling of mouse leukocytes along blood vessels expressing P- and E-selectin in the auricular skin in vivo. Consistent with these findings, the mAbs blocked P- and E-selectin-dependent leukocyte rolling in a flow chamber assay. Taken together, these results indicate that novel anti-sLe(x) mAbs reactive with both human and mouse tissues, with the blocking ability against leukocyte trafficking mediated by all three selectins, have been established. These mAbs should be useful in determining the role of sLe(x) antigen under physiological and pathological conditions.
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
authors.forename: Ryuji
authors.initials: R
authors.lastname: Matsumura
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan, the Department of Biochemistry, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo 142-8501, Japan, and.
authors.forename: Jotaro
authors.initials: J
authors.lastname: Hirakawa
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Sato
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Ikeda
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
authors.forename: Motoe
authors.initials: M
authors.lastname: Nagai
authors.affiliation: the Glycobiology Unit, Sanford-Burnham Medical Research Institute, La Jolla, California 92037.
authors.forename: Minoru
authors.initials: M
authors.lastname: Fukuda
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Imai
authors.affiliation: From the Laboratory of Microbiology and Immunology, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan, the Department of Biochemistry, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo 142-8501, Japan, and h-kawashima@hoshi.ac.jp.
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kawashima
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology*; D001483:Base Sequence; D017931:DNA Primers; D003877:Dermatitis, Contact / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D006801:Humans; D036904:Leukocyte Rolling; D007962:Leukocytes / Q000166:cytology* / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D009844:Oligosaccharides / Q000276:immunology*; D016133:Polymerase Chain Reaction; D000080506:Sialyl Lewis X Antigen
chemical_list: D000906:Antibodies; D017931:DNA Primers; D009844:Oligosaccharides; D000080506:Sialyl Lewis X Antigen
keywords: carbohydrate function; carbohydrate-binding protein; cellular immune response; glycosylation; immunology; leukocyte