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Dissection of Agonistic and Blocking Effects of CD200 Receptor Antibodies
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Dissection of Agonistic and Blocking Effects of CD200 Receptor Antibodies
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Dissection of Agonistic and Blocking Effects of CD200 Receptor Antibodies
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Journal Article
Dissection of Agonistic and Blocking Effects of CD200 Receptor Antibodies
2013
Overview
The CD200 receptor (CD200R) is present mainly on myeloid cells and gives inhibitory signals when engaged by its ligand CD200. The interaction is currently of therapeutic interest in cancer and inflammation. However functional effects are complicated by the fact that CD200R is itself polymorphic and also a member of a paired receptor family with four closely related gene products in mice called CD200RLa etc. We show that a second allele of CD200R (termed CD200R(2)) that differs in 7 amino acids also binds CD200 but did not react with the widely used CD200R antibody OX110. Biochemical and functional analysis showed that the CD200/CD200R interaction was blocked by the OX131, mAb that recognises both CD200R(1) and CD200R(2), but not by OX110 mAb. Both mAb can give agonistic inhibitory signals but functional analysis shows OX131 mAb also has the potential to block inhibition by preventing the ligand-receptor interaction and hence gives opposing effects. Although OX131 mAb cross-reacts with the activating receptor CD200RLe, it is specific for CD200R in C57BL/6 whilst OX110 mAb cross-reacts on CD200RLc. The results show the importance of the repertoire of paired receptors in strains or individuals and mAb used with implications for paired receptor analysis and therapeutics.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Antibodies, Monoclonal - immunology
/ Antigens, Surface - chemistry
/ Antigens, Surface - immunology
/ Antigens, Surface - metabolism
/ Biology
/ Blocking
/ Cancer
/ Cloning
/ Genes
/ Humans
/ Ligands
/ Mice
/ Protein Isoforms - chemistry
/ Protein Isoforms - immunology
/ Protein Isoforms - metabolism
/ Proteins
/ Rats
/ Receptors, Cell Surface - agonists
/ Receptors, Cell Surface - chemistry
/ Receptors, Cell Surface - immunology
/ Receptors, Cell Surface - metabolism
/ Surgery
