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    J Immunol Methods. 2008 Jun 1;335(1-2):71-8. Epub 2008 Mar 26.

    Simple and highly sensitive assay system for TNFR2-mediated soluble- and transmembrane-TNF activity.

    Abe Y, Yoshikawa T, Kamada H, Shibata H, Nomura T, Minowa K, Kayamuro H, Katayama K, Miyoshi H, Mukai Y, Yoshioka Y, Nakagawa S, Tsunoda S, Tsutsumi Y.

    Laboratory of Pharmaceutical Proteomics, National Institute of Biomedical Innovation, Ibaraki, Osaka, Japan.

    Drugs that target tumor necrosis factor-alpha (TNF) are particularly important in the treatment of severe inflammatory progression in rheumatoid arthritis, Crohn's disease and psoriasis. Despite the central role of the TNF/TNF receptor (TNFR) in various disease states, there is a paucity of information concerning TNFR2 signaling. In this study, we have developed a simple and highly sensitive cell-death based assay system for analyzing TNFR2-mediated bioactivity that can be used to screen for TNFR2-selective drugs. Using a lentiviral vector, a chimeric receptor was engineered from the extracellular and transmembrane domain of human TNFR2 and the intracellular domain of mouse Fas and the recombinant protein was then expressed in TNFR1(-/-)R2(-/-) mouse preadipocytes. Our results demonstrate that this chimeric receptor is capable of inducing apoptosis by transmembrane- as well as soluble-TNF stimuli. Moreover, we found that our bioassay based on cell death phenotype had an approximately 80-fold higher sensitivity over existing bioassays. We believe our assay system will be an invaluable research tool for studying TNFR2 and for screening TNFR2-targeted drugs.

    PMID: 18417150 [PubMed - indexed for MEDLINE]

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