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    Garcinol, a polyisoprenylated benzophenone modulates multiple proinflammatory signaling cascades leading to the suppression of growth and survival of head and neck carcinoma

    Access Status
    Open access via publisher
    Authors
    Li, F.
    Shanmugam, M.
    Chen, L.
    Chatterjee, S.
    Basha, J.
    Kumar, Alan Prem
    Kundu, T.
    Sethi, G.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, Feng and Shanmugam, Muthu K. and Chen, Luxi and Chatterjee, Snehajyoti and Basha, Jeelan and Kumar, Alan Prem and Kundu, Tapas K. and Sethi, Gautam. 2013. Garcinol, a polyisoprenylated benzophenone modulates multiple proinflammatory signaling cascades leading to the suppression of growth and survival of head and neck carcinoma. Cancer Prevention Research. 6 (8): pp. 843-854.
    Source Title
    Cancer Prevention Research
    DOI
    10.1158/1940-6207.CAPR-13-0070
    ISSN
    1940-6207
    URI
    http://hdl.handle.net/20.500.11937/39026
    Collection
    • Curtin Research Publications
    Abstract

    Constitutive activation of proinflammatory transcription factors such as STAT3 and NF-kB plays a pivotal role in the proliferation and survival of squamous cell carcinoma of the head and neck (HNSCC). Thus, the agents that can modulate deregulated STAT3 and NF-kB activation have a great potential both for the prevention and treatment of HNSCC. In the present report, we investigated the potential effects of garcinol, an active component of Garcinia indica on various inflammatory mediators involved in HNSCC progression using cell lines and xenograft mouse model. We found that garcinol inhibited constitutively activated STAT3in HNSCC cells in a time- and dose-dependent manner, which correlated with the suppression of the upstream kinases (c-Src, JAK1, and JAK2) in HNSCC cells. Also, we noticed that the generation of reactive oxygen species is involved in STAT3 inhibitory effect of garcinol. Furthermore, garcinol exhibited an inhibitory effect on the constitutive NF-kB activation, mediated through the suppression of TGF-b–activated kinase 1 (TAK1) and inhibitor of IkB kinase (IKK) activation in HNSCC cells. Garcinol also downregulated the expression of various gene products involved in proliferation, survival, and angiogenesis that led to the reduction of cell viability and induction of apoptosis in HNSCC cells. When administered intraperitoneally, garcinol inhibited the growth of human HNSCC xenograft tumors in male athymic nu/nu mice. Overall, our results suggest for the first time that garcinol mediates its antitumor effects in HNSCC cells and mouse model through the suppression of multiple proinflammatory cascades.

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