Search results for: Rat monoclonal anti mouse CCL-25 Anti-Mouse antibodies
#36810516 2023/01/31 To Up
Determination of the Binding Epitope of an Anti-Mouse CCR9 Monoclonal Antibody (CMab-24) Using the 1× Alanine and 2× Alanine-Substitution Method.
C-C chemokine receptor 9 (CCR9) is a receptor for C-C-chemokine ligand 25 (CCL25). CCR9 is crucial in the chemotaxis of immune cells and inflammatory responses. Moreover, CCR9 is highly expressed in tumors, including several solid tumors and T-cell acute lymphoblastic leukemia. Several preclinical studies have shown that anti-CCR9 monoclonal antibodies (mAbs) exert antitumor activity. Therefore, CCR9 is an attractive target for tumor therapy. In this study, we conducted the epitope mapping of an anti-mouse CCR9 (mCCR9) mAb, CMab-24 (rat IgG, kappa), using the 1× alanine (1× Ala)- and 2× alanine (2× Ala)-substitution methods via enzyme-linked immunosorbent assay. We first performed the 1× Ala-substitution method using one alanine-substituted peptides of the mCCR9 N-terminus (amino acids 1-19). CMab-24 did not recognize two peptides (F14A and F17A), indicating that Phe14 and Phe17 are critical for CMab-24-binding to mCCR9. Furthermore, we conducted the 2× Ala-substitution method using two consecutive alanine-substituted peptides of the mCCR9 N-terminus, and showed that CMab-24 did not react with four peptides (M13A-F14A, F14A-D15A, D16A-F17A, and F17A-S18A), indicating that MFDDFS is involved in CMab-24-binding to mCCR9. Overall, combining, the 1× Ala- or 2× Ala-scanning methods could be useful for understanding for target-antibody interaction.Hiyori Kobayashi, Teizo Asano, Tomohiro Tanaka, Hiroyuki Suzuki, Mika K Kaneko, Yukinari Kato
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