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Biochemical and immunological characterization of a novel monoclonal antibody against mouse leukotriene B4 receptor 1
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Biochemical and immunological characterization of a novel monoclonal antibody against mouse leukotriene B4 receptor 1
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Biochemical and immunological characterization of a novel monoclonal antibody against mouse leukotriene B4 receptor 1
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Journal Article
Biochemical and immunological characterization of a novel monoclonal antibody against mouse leukotriene B4 receptor 1
2017
Overview
Leukotriene B4 (LTB4) receptor 1 (BLT1) is a G protein-coupled receptor expressed in various leukocyte subsets; however, the precise expression of mouse BLT1 (mBLT1) has not been reported because a mBLT1 monoclonal antibody (mAb) has not been available. In this study, we present the successful establishment of a hybridoma cell line (clone 7A8) that produces a high-affinity mAb for mBLT1 by direct immunization of BLT1-deficient mice with mBLT1-overexpressing cells. The specificity of clone 7A8 was confirmed using mBLT1-overexpressing cells and mouse peripheral blood leukocytes that endogenously express BLT1. Clone 7A8 did not cross-react with human BLT1 or other G protein-coupled receptors, including human chemokine (C-X-C motif) receptor 4. The 7A8 mAb binds to the second extracellular loop of mBLT1 and did not affect LTB4 binding or intracellular calcium mobilization by LTB4. The 7A8 mAb positively stained Gr-1-positive granulocytes, CD11b-positive granulocytes/monocytes, F4/80-positive monocytes, CCR2-high and CCR2-low monocyte subsets in the peripheral blood and a CD4-positive T cell subset, Th1 cells differentiated in vitro from naïve CD4-positive T cells. This mAb was able to detect Gr-1-positive granulocytes and monocytes in the spleens of naïve mice by immunohistochemistry. Finally, intraperitoneal administration of 7A8 mAb depleted granulocytes and monocytes in the peripheral blood. We have therefore succeeded in generating a high-affinity anti-mBLT1 mAb that is useful for analyzing mBLT1 expression in vitro and in vivo.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animals
/ Antibodies, Monoclonal, Murine-Derived - chemistry
/ Antibodies, Monoclonal, Murine-Derived - immunology
/ Antibodies, Monoclonal, Murine-Derived - pharmacology
/ Antigens
/ Blood
/ Calcium
/ Calcium Signaling - drug effects
/ Cell Differentiation - immunology
/ Male
/ Medicine
/ Medicine and Health Sciences
/ Mice
/ Monocyte chemoattractant protein 1
/ Protein Structure, Secondary
/ Proteins
/ Receptors, Leukotriene B4 - antagonists & inhibitors
/ Receptors, Leukotriene B4 - chemistry
/ Receptors, Leukotriene B4 - immunology
