Functional and Molecular Characterization of a Monoclonal Antibody against the 165-186 Peptide of Human 1beta

Autor: B. Blum, Artur J. Ulmer, W. Rönspeck, Brandt E, H. Herzbeck, H.-D. Flad, B. Frenzel
Rok vydání: 1989
Předmět:
Zdroj: Scandinavian Journal of Immunology. 30:549-562
ISSN: 1365-3083
0300-9475
DOI: 10.1111/j.1365-3083.1989.tb02462.x
Popis: A synthetic peptide of human recombinant interleukin 1 beta (hrIL-1 beta) 165-186, which exhibits biological activity in the human fibroblast assay, was used as an immunizing antigen to obtain a murine monoclonal antibody (MoAb) termed FIB 1. This MoAb, an IgG1, reacts specifically with hrIL-1 beta, but not with hrIL-1 alpha, as measured in enzyme-linked immunosorbent assays (ELISA). The MoAb FIB 1 detects the characteristic 17 kDa IL-1 protein in Western blots. Binding to the antigen is specific, as deduced also from the close correlation of ELISA immunoreactivity with IL-1 biological activity. The anti-IL-1 beta 165-186 Ab specifically neutralizes the biological activity of hrIL-1 beta and native IL-1, as measured by the IL-1-induced proliferation of murine thymocytes and human fibroblasts and the IL-1-dependent IL-2 production by murine T cells (EL4-6.1). Fifty per cent of hrIL-1 beta activity (25 U/ml, or 0.25 ng/ml) has neutralized by less than 30 micrograms/ml of MoAb. Furthermore, FIB 1 recognizes intracellular IL-1 in lipopolysaccharide-stimulated human peripheral blood mononuclear cells. The anti-IL-1 beta 165-186 Ab does not react with the shorter IL-1 beta fragment 161-173 in solid-phase ELISA, therefore the binding region seems to be localized in the amino acid sequence VALGLKEKNLYLS. A sandwich-ELISA, using a polyclonal sheep anti-IL-1 beta 251-269 Ab as the capture antibody and an anti-IL-1 beta 165-186 MoAb as the detecting probe, allowed the determination of IL-1 beta from crude culture supernatants.
Databáze: OpenAIRE
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