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  • Title: Tautomycetin suppresses the TNFalpha/NF-kappaB pathway via inhibition of IKK activation.
    Author: Mitsuhashi S, Shima H, Li Y, Tanuma N, Okamoto T, Kikuchi K, Ubukata M.
    Journal: Int J Oncol; 2008 Nov; 33(5):1027-35. PubMed ID: 18949366.
    Abstract:
    TNFalpha activated NF-kappaB and associated regulatory factors including IKK are strongly implicated in a variety of hematological and solid tumor malignancies. We show that tautomycetin (TC) specifically inhibits activation of NF-kappaB among the three TNFalpha effectors (NF-kappaB, JNK and caspase). TC inhibited T-loop phosphorylation of IKKalpha and IKKbeta, thereby preventing degradation of the NF-kappaB inhibitor, IkappaBalpha. Co-immunoprecipitation experiments revealed that the catalytic subunit of PP1 (PP1C) was involved in the IKK complex. Pull-down analysis using recombinant GST-TNFalpha, showed that PP1C was recruited to TNFR1 together with IKK complex, RIP and TAK1 upon stimulus. These results suggest that the PP1 positively regulates the TNFalpha-induced NF-kappaB pathway at the level of IKK activation. Thus, TC might be used therapeutically to suppress the TNFalpha/NF-kappaB pathway.
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