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The pivotal role of IKK? in the development of spontaneous lung squamous cell carcinomas.


ABSTRACT: Here, we report that kinase-dead IKK? knockin mice develop spontaneous lung squamous cell carcinomas (SCCs) associated with IKK? downregulation and marked pulmonary inflammation. IKK? reduction upregulated the expression of p63, Trim29, and keratin 5 (K5), which serve as diagnostic markers for human lung SCCs. IKK?(low)K5(+)p63(hi) cell expansion and SCC formation were accompanied by inflammation-associated deregulation of oncogenes, tumor suppressors, and stem cell regulators. Reintroducing transgenic K5.IKK?, depleting macrophages, and reconstituting irradiated mutant animals with wild-type bone marrow (BM) prevented SCC development, suggesting that BM-derived IKK? mutant macrophages promote the transition of IKK?(low)K5(+)p63(hi) cells to tumor cells. This mouse model resembles human lung SCCs, sheds light on the mechanisms underlying lung malignancy development, and identifies targets for therapy of lung SCCs.

SUBMITTER: Xiao Z 

PROVIDER: S-EPMC3649010 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature

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Here, we report that kinase-dead IKKα knockin mice develop spontaneous lung squamous cell carcinomas (SCCs) associated with IKKα downregulation and marked pulmonary inflammation. IKKα reduction upregulated the expression of p63, Trim29, and keratin 5 (K5), which serve as diagnostic markers for human lung SCCs. IKKα(low)K5(+)p63(hi) cell expansion and SCC formation were accompanied by inflammation-associated deregulation of oncogenes, tumor suppressors, and stem cell regulators. Reintroducing tra  ...[more]

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