Cx 3 Mab-4: A Novel Anti-Mouse CXCR3 Monoclonal Antibody for Flow Cytometry.

C-X-C motif chemokine receptor 3 (CXCR3, CD183) is a G-protein-coupled receptor for CXCL9, CXCL10, and CXCL11. CXCR3 induces chemotaxis of immune cells and promotes inflammation. Various mouse models have been developed to mimic the pathogenesis of diseases and used in the evaluation of therapeutics for these diseases. Although CXCR3 is an attractive target to suppress inflammation, anti-CXCR3 therapeutic agents have not been approved. In this study, we established a novel anti-mouse CXCR3 (mCXCR3) monoclonal antibody, Cx3 Mab-4 (rat IgG1 , kappa), using the Cell-Based Immunization and Screening method. Flow cytometric analysis demonstrated that Cx3 Mab-4 bound to mCXCR3-overexpressed Chinese hamster ovary-K1 (CHO/mCXCR3) cells, but did not react to parental CHO-K1 cells. The dissociation constant of Cx3 Mab-4 was determined as 1.3 × 10-9 M, indicating that Cx3 Mab-4 possesses a high affinity to mCXCR3-expressing cells. Cx3 Mab-4 could be useful for targeting CXCR3-expressing cells in preclinical mouse models.