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A novel cytokine receptor-ligand pair. Identification, molecular characterization, and in vivo immunomodulatory activity.

As part of a large scale effort to discover novel secreted proteins, a cDNA encoding a novel cytokine was identified. Alignments of the sequence of the new protein, designated IL-17B, suggest it to be a homolog of the recently described T cell-derived cytokine, IL-17. By Northern analysis, EST distribution and real-time quantitative polymerase chain reaction analysis, mRNA was detected in many cell types. A novel type I transmembrane protein, identified in an EST data base by homology to IL-17R, was found to bind specifically IL-17B, as determined by surface plasmon resonance analysis, flow cytometry, and co-immunoprecipitation experiments. Readily detectable transcription of IL-17BR was restricted to human kidney, pancreas, liver, brain, and intestines and only a few of the many cell lines tested. By using a rodent ortholog of IL-17BR as a probe, IL-17BR message was found to be drastically up-regulated during intestinal inflammation elicited by indomethacin treatment in rats. In addition, intraperitoneal injection of IL-17B purified from Chinese hamster ovary cells caused marked neutrophil migration in normal mice, in a specific and dose-dependent manner. Together these results suggest that IL-17B may be a novel proinflammatory cytokine acting on a restricted set of target cell types. They also demonstrate the strength of genomic approaches in the unraveling of novel biological pathways.

Pubmed ID: 10749887 RIS Download

Mesh terms: Adjuvants, Immunologic | Amino Acid Sequence | Animals | Base Sequence | Cell Line | Cell Movement | Cricetinae | DNA, Complementary | Expressed Sequence Tags | Humans | Interleukin-17 | Ligands | Mice | Molecular Sequence Data | Neutrophils | RNA, Messenger | Rats | Receptors, Interleukin | Receptors, Interleukin-17 | Recombinant Proteins | Sequence Homology, Amino Acid

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