SIRT1 promotes epithelial–mesenchymal transition and metastasis in colorectal cancer by regulating Fra-1 expression. Issue 2 (1st June 2016)

• Record Type: Journal Article
• Authors: Cheng, Feifei; Su, Li; Yao, Chao; Liu, Limei; Shen, Junjie; Liu, Chungang; Chen, Xuejiao; Luo, Yongli; Jiang, Lupin; Shan, Juanjuan; Chen, Jun; Zhu, Wei; Shao, Jimin; Qian, Cheng
• Is Part Of: Cancer letters. Volume 375:Issue 2(2016)
• Page Start: 274
• Page End: 283
• Publication Date: 2016-06-01
• Subjects: Colorectal cancer -- Metastasis -- SIRT1 -- Epithelial–mesenchymal transition -- Fra-1; Cancer -- Periodicals; Neoplasms -- Periodicals; Cancer -- Périodiques; Electronic journals; 616.994
• DOI: 10.1016/j.canlet.2016.03.010
• Languages: English
• ISSNs: 0304-3835

Abstract

Highlights: ⋅ SIRT1 promotes epithelial–mesenchymal transition and metastasis in colorectal cancer. ⋅ SIRT1 promotes EMT in a Fra-1-dependent manner. ⋅ SIRT1 or Fra-1 overexpression correlated with worse overall survival. Abstract: Understanding molecular mechanisms of colorectal cancer (CRC) metastasis is urgently required for targeted therapy and prognosis of metastatic CRC. In this study, we explored potential effects of silent mating type information regulation 2 homolog 1 (SIRT1) on CRC metastasis. Our data showed that ectopic expression of SIRT1 markedly increased the migration and invasion of CRC cells. In contrast, silencing SIRT1 repressed this behavior in aggressive CRC cells. Tumor xenograft experiments revealed that knockdown of SIRT1 impaired CRC metastasis in vivo . Silencing SIRT1 in CRC cells induced mesenchymal–epithelial transition (MET), which is the reverse process of epithelial–mesenchymal transition (EMT) and characterized by a gain of epithelial and loss of mesenchymal markers. We provided a mechanistic insight toward regulation of Fra-1 by SIRT1 and demonstrated a direct link between the SIRT1-Fra-1 axis and EMT. Moreover, SIRT1 expression correlated positively with Fra-1 expression, metastasis and overall survival in patients with CRC. Taken together, our data provide a novel mechanistic role of SIRT1 in CRC metastasis, suggesting that SIRT1 may serve as a potential therapeutic target for metastatic CRC.