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Chemokine receptors are seven-transmembrane domain G-protein coupled receptors that mediate the biological activities of chemokines. Most of these receptors exhibit promiscuous binding properties whereby several different chemokines signal through the same receptor. They are named according to the chemokine subfamily they bind. There are currently six CXC-specific receptors designated CXCR1 to CXCR6, eleven CC-specific receptors designated CCR1 to CCR11, and one C receptor, XCR1. CX3CR1 is the receptor for fractalkine.
Image: CXCR2 staining of human lymph nodes. Cells were stained using ABC-HRP + AEC (red) and Haematoxylin (blue) counterstain. It is recommended to employ an avidin-biotin blocking step and quench endogenous peroxidase.
Neutralization of Human Cell Surface CXCR2 mediated Bioactivity
The exact concentration of antibody required to neutralize human cell surface CXCR2 mediated bioactivity is dependent on the concentration as well as on the number of CXCR2 receptors present on the cell surface (a function of cell type and culture conditions). The Neutralization Dose50 (ND50) for this antibody is defined as that concentration of antibody required to yield one-half maximal inhibition of the cell surface CXCR2 mediated rhGROα response on responsive cells at a specific GROα concentration. The ND50 for this lot of anti-human CXCR2 antibody was determined to be approximately 1 - 5 µg/mL in the presence of 5 ng/mL rhGROα in a chemotaxis assay using BaF/3 cells transfected with hCXCR2. The specific conditions are described in the figure legends. The ND50 for the neutralization of myeloperoxidase release from human granulocytes is 0.5 - 1.5 µg/mL in the presence of 1 µg/mL rhGROα.
Human GROα chemoattracts BaF/3 cells that have been transfected with hCXCR2. The number of cells that have migrated through to the lower chamber are quantitated using Resazurin Fluorescence staining. The ED50 for this effect is typically 1 - 4 ng/mL.
To measure the ability of the antibody to block rhGROα mediated chemotaxis of BaF/3 hCXCR2 cells, rhGROα at 5 ng/mL was added to the lower compartment of a 96-well chemotaxis chamber (NeuroProbe, Cabin John, MD).The chemotaxis chamber was then assembled using a PVP-free polycarbonate filter (5 micron pore size). Serial dilutions of the antibody (at the concentrations indicated) and 0.2 x 106 cells/well were added to the top wells of the chamber. After incubation for 3 hours at 37° C in a 5% CO2 humidified incubator, the chamber was disassembled and the cells that migrated through to the lower chamber were transferred to a working plate and quantitated using Resazurin Fluorescence. As shown in Figure 2, the ND50 for this lot of antibody is approximately 1 - 5 µg/mL.