Development and characterization of mouse monoclonal antibodies reactive with chicken CXCLi2

Interleukin-8(IL-8)/CXCL8 is a CXC-family chemokine that attracts lymphocytes to sites of tissue damage and plays a role in the inflammatory response and wound healing. Chicken chemotactic and angiogenic factor was referred to as chCXCLi2 and has been studied as one of human CXCL8 homologue for more than 20 years. However, no monoclonal antibodies (mAbs) that specifically detect chCXCLi2 have been developed. Here, we developed and characterized mouse mAbs against chCXCLi2 to define its immunological properties. Two mouse mAbs against chCXCLi2 were generated and confirmed to display specific binding with not only recombinants, but endogenous chCXCLi2 by Western blot analysis, ELISA, and immunocytochemistry. Inhibition of chCXCLi2-induced chemotactic activity on peripheral blood lymphocytes, proliferation of chicken macrophage cells and expression of alpha smooth-muscle actin in chicken embryonic fibroblast cells by antibodies indicate that these antibodies are capable of blocking chCXCLi2 bioactivity. These chCXCLi2 mAbs will be useful reagents for future investigations of inflammation in poultry.

Development and characterization of monoclonal antibodies specific for chicken IL-8

Interleukin-8/CXCL8 (IL-8) is a CXC-family chemokine produced by fibroblasts and other cell types, including epithelial cells, endothelial cells, neutrophils, and macrophages. Given that IL-8 attracts lymphocytes to sites of tissue damage, it plays a role in the inflammatory response and wound healing. Chicken chemotactic and angiogenic factor, encoded by the 9E3/CEF4 gene, was identified and has been studied as a human IL-8 homologue for over than 20 years. However, detecting and quantifying of bioactive chemokine/cytokine in avian species is limited by the lack of specific antibodies and reliable bioassays although the use of mAbs has become routine in the mammalian research and diagnosis. Thus, we develop and characterize mouse mAbs against chIL-8 to further define its immunological and biological properties. Two mouse mAbs against chIL-8 were generated using recombinant chIL-8 protein produced in Escherichia coli. These were confirmed to display specific binding with not only recombinants, but also native chIL-8 by Western blot analysis, enzyme-linked immunosorbent assay, and immunocytochemistry. Inhibition of IL-8-induced chemotaxis of peripheral blood lymphocytes, proliferation of chicken macrophage cells and expression of alpha smooth-muscle actin in chicken embryonic fibroblast cells by both antibodies indicate that both antibodies are capable of blocking chIL-8 bioactivity and will be useful reagents for future investigations of inflammation in poultry.