A new epitope on sheep CD45R molecule detected by a monoclonal antibody.
This paper describes the production and characterization of a monoclonal antibody (mAb), Co-46D5, which recognizes a new epitope on the isoform of the homologous sheep leukocyte common antigen (LCA) or CD45. This nmAb was submitted to the 3rd workshop on ruminant leukocyte antigens and was assigned to a cluster reactive with B- and T-cells subsets. Co-46D recognizes a 220 kDa molecule on peripheral blood mononuclear cells (PBMC) and spleen cells but not on thymocytes. Flow cytometry (FCM) analysis shows that Co-46D5 reacted with 30% of PBMC and 50% of spleen cells and more than 95% of cells freshly isolated from lymphoid follicles of the ileal Peyer's patches (IPP) of young lambs. By immunohistochemistry, the antigen was detected mainly on B-cell areas of lymph nodes and spleen. It was also found on a subpopulation of medullar thymocytes. Based on these results, we assume that Co-46D5 recognizes a new epitope on the largest isoform of the sheep CD45 receptor, probably on the homologous to the human CD45RA isoform.
Unidad Mixta CSIC-UCO, Facultad de Veterinaria, Córdoba, Spain.
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Mateo
J J
JJ
Garrido
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Pérez de la Lastra
J
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Martín de las Mulas
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Moreno
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CO
Pintado
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Llanes
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D015153:Blotting, Western / Q000662:veterinary; D004591:Electrophoresis, Polyacrylamide Gel / Q000662:veterinary; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D000939:Epitopes / Q000032:analysis*; D005260:Female; D005434:Flow Cytometry / Q000662:veterinary; D007124:Immunoenzyme Techniques / Q000662:veterinary; D007150:Immunohistochemistry; D017493:Leukocyte Common Antigens / Q000032:analysis / Q000737:chemistry / Q000276:immunology*; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D012756:Sheep / Q000276:immunology*; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013950:Thymus Gland / Q000166:cytology / Q000276:immunology
D000911:Antibodies, Monoclonal; D000939:Epitopes; D017493:Leukocyte Common Antigens