CC chemokine receptor 3 (CCR3) belongs to the G protein-coupled receptor family and is highly expressed in eosinophils and basophils. CCR3 is essential for recruiting eosinophils into the lung. Moreover, CCR3 was found in the serum of colorectal cancer patients higher than in the control group. Therefore, CCR3 will be a useful target for asthma and colorectal cancer diagnosis. This study developed a specific and sensitive monoclonal antibody (mAb) for mouse CCR3 (mCCR3), which is useful for flow cytometry using the Cell-Based Immunization and Screening method. The established anti-mCCR3 mAb, C3Mab-3 (rat IgG2a, kappa), reacted with mCCR3-overexpressed Chinese hamster ovary-K1 (CHO/mCCR3) cells through flow cytometry. C3Mab-3 also reacted with P388 (mouse lymphoid neoplasma) and J774-1 (mouse macrophage-like) cells, which express mCCR3 endogenously. Kinetic analyses using flow cytometry indicated that KDs of C3Mab-3 for CHO/mCCR3, P388, and J774-1 cells were 4.3 × 10-8 M, 2.6 × 10-7 M, and 2.4 × 10-7 M, respectively. C3Mab-3 could be a valuable tool for elucidating mCCR3-related biological response using flow cytometry.
Keywords: CBIS; monoclonal antibody; mouse CCR3.