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SIRT6 promotes COX-2 expression and acts as an oncogene in skin cancer.


ABSTRACT: SIRT6 is a SIR2 family member that regulates multiple molecular pathways involved in metabolism, genomic stability, and aging. It has been proposed previously that SIRT6 is a tumor suppressor in cancer. Here, we challenge this concept by presenting evidence that skin-specific deletion of SIRT6 in the mouse inhibits skin tumorigenesis. SIRT6 promoted expression of COX-2 by repressing AMPK signaling, thereby increasing cell proliferation and survival in the skin epidermis. SIRT6 expression in skin keratinocytes was increased by exposure to UVB light through activation of the AKT pathway. Clinically, we found that SIRT6 was upregulated in human skin squamous cell carcinoma. Taken together, our results provide evidence that SIRT6 functions as an oncogene in the epidermis and suggest greater complexity to its role in epithelial carcinogenesis.

SUBMITTER: Ming M 

PROVIDER: S-EPMC4203414 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature

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SIRT6 promotes COX-2 expression and acts as an oncogene in skin cancer.

Ming Mei M   Han Weinong W   Zhao Baozhong B   Sundaresan Nagalingam R NR   Deng Chu-Xia CX   Gupta Mahesh P MP   He Yu-Ying YY  

Cancer research 20141001 20


SIRT6 is a SIR2 family member that regulates multiple molecular pathways involved in metabolism, genomic stability, and aging. It has been proposed previously that SIRT6 is a tumor suppressor in cancer. Here, we challenge this concept by presenting evidence that skin-specific deletion of SIRT6 in the mouse inhibits skin tumorigenesis. SIRT6 promoted expression of COX-2 by repressing AMPK signaling, thereby increasing cell proliferation and survival in the skin epidermis. SIRT6 expression in skin  ...[more]

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