MONOCLONAL-ANTIBODIES DETECT DIFFERENT DISTRIBUTION PATTERNS OF IL-8 RECEPTOR-A AND IL-8 RECEPTOR-B ON HUMAN PERIPHERAL-BLOOD LEUKOCYTES

mAbs previously reported to be specific for IL-8R type A (IL-8R-A) and mAbs specific for IL-8R type B (IL-8R-B), which are described in this paper, were used to investigate the expression of each receptor on va rious types of cells. We generated mAbs specific for IL-8R-B, 4D1, and 10H2 by immunizing mice with 293 cells that expressed IL-8R-B and by selecting hybridoma cell lines that secreted mAbs that bind to human n eutrophils. Flow cytometry showed that mAbs 4D1 and 10H2 were specific for IL-8R-B, as determined by their exclusive binding to 293-27 cells that expressed IL-8R-B, but not to 293-71 cells that expressed IL-8R- A. Epitopes recognized by these IL-8R-B-specific mAbs were shown to be within the N-terminal residues 1-18 of the IL-8R-B on the basis of th eir binding to various N-terminal peptides, as measured by ELISA. Thes e IL-8R-B-specific mAbs were able to inhibit up to 90 and 50% of the I -125-labeled IL-8 binding to 293-27 cells and human neutrophils, respe ctively. The combination of mAb 9H1 (anti-IL-8R-A) and mAb 10H2 (anti- IL-8R-B) inhibited approximately 70% of I-125-labeled IL-8 binding to human neutrophils. Flow cytometry showed a wide range of donor variati on in the expression levels of IL-8R-A and IL-8R-B on various human pe ripheral blood leukocytes. All neutrophils, all monocytes, and 5 to 25 % of total lymphocytes (CD8(+) T cells and CD56(+) NK cells) expressed IL-8R. Neutrophils expressed the highest level of both IL-8R-A and IL -8R-B, at an approximately equal ratio, whereas monocytes and IL-8R(+) lymphocytes expressed higher levels of IL-8R-B than IL-8R-A. Double-c olor flow cytometric analysis showed that 7 to 42% of CD8(+) T eel Is and 39 to 76% of CD56(+) NK cells, but no CD 20(+) 8 cells or CD4(+) T cells, expressed IL-8R.