1 results for Akira, S

  • The chemotherapeutic agent DMXAA potently and specifically activates the TBK1-IRF-3 signalling axis

    Roberts, ZJ; Goutagny, N; Perera, PY; Fitzgerald, KA; Kato, H; Kumar, H; Kawai, T; Akira, S; Savan, R; van Echo, D; Young, H; Ching, Lai-Ming; Vogel, SN (2007)

    Journal article
    The University of Auckland Library

    Vascular disrupting agents (VDAs) represent a novel approach to the treatment of cancer, resulting in the collapse of tumor vasculature and tumor death. 5,6-dimethylxanthenone-4- acetic acid (DMXAA) is a VDA currently in advanced phase II clinical trials, yet its precise mechanism of action is unknown despite extensive preclinical and clinical investigations. Our data demonstrate that DMXAA is a novel and specifi c activator of the TANK-binding kinase 1 (TBK1)???interferon (IFN) regulatory factor 3 (IRF-3) signaling pathway. DMXAA treatment of primary mouse macrophages resulted in robust IRF-3 activation and 750- fold increase in IFN-?? mRNA, and in contrast to the potent Toll-like receptor 4 (TLR4) agonist lipopolysaccharide (LPS), signaling was independent of mitogen-activated protein kinase (MAPK) activation and elicited minimal nuclear factor ??B???dependent gene expression. DMXAA-induced signaling was critically dependent on the IRF-3 kinase, TBK1, and IRF-3 but was myeloid differentiation factor 88???, Toll???interleukin 1 receptor domain??? containing adaptor inducing IFN-?????, IFN promoter-stimulator 1???, and inhibitor of ??B kinase???independent, thus excluding all known TLRs and cytosolic helicase receptors. DMXAA pretreatment of mouse macrophages induced a state of tolerance to LPS and vice versa. In contrast to LPS stimulation, DMXAA-induced IRF-3 dimerization and IFN-?? expression were inhibited by salicylic acid. These findings detail a novel pathway for TBK1- mediated IRF-3 activation and provide new insights into the mechanism of this new class of chemotherapeutic drugs.

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