alexa Persistently activated Stat3 maintains constitutive NF-kappaB activity in tumors.
Oncology

Oncology

Journal of Cancer Science & Therapy

Author(s): Lee H, Herrmann A, Deng JH, Kujawski M, Niu G,

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Abstract NF-kappaB (RelA) is constitutively active in many cancers, where it upregulates antiapoptotic and other oncogenic genes. While proinflammatory stimulus-induced NF-kappaB activation involves IKK-dependent nuclear translocation, mechanisms for maintaining constitutive NF-kappaB activity in tumors have not been elucidated. We show here that maintenance of NF-kappaB activity in tumors requires Stat3, which is also frequently constitutively activated in cancer. Stat3 prolongs NF-kappaB nuclear retention through acetyltransferase p300-mediated RelA acetylation, thereby interfering with NF-kappaB nuclear export. Stat3-mediated maintenance of NF-kappaB activity occurs in both cancer cells and tumor-associated hematopoietic cells. Both murine and human cancers display highly acetylated RelA, which is associated with Stat3 activity. This Stat3/NF-kappaB interaction is thus central to both the transformed and nontransformed elements in tumors.
This article was published in Cancer Cell and referenced in Journal of Cancer Science & Therapy

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