Article Publish Status: FREE
Abstract Title:

Loss of corepressor PER2 under hypoxia up-regulates OCT1-mediated EMT gene expression and enhances tumor malignancy.

Abstract Source:

Proc Natl Acad Sci U S A. 2013 Jul 23 ;110(30):12331-6. Epub 2013 Jul 8. PMID: 23836662

Abstract Author(s):

Wendy W Hwang-Verslues, Po-Hao Chang, Yung-Ming Jeng, Wen-Hung Kuo, Pei-Hsun Chiang, Yi-Cheng Chang, Tsung-Han Hsieh, Fang-Yi Su, Liu-Chen Lin, Serena Abbondante, Cheng-Yuan Yang, Huan-Ming Hsu, Jyh-Cherng Yu, King-Jen Chang, Jin-Yuh Shew, Eva Y-H P Lee, Wen-Hwa Lee

Article Affiliation:

Wendy W Hwang-Verslues

Abstract:

The circadian clock gene Period2 (PER2) has been suggested to be a tumor suppressor. However, detailed mechanistic evidence has not been provided to support this hypothesis. We found that loss of PER2 enhanced invasion and activated expression of epithelial-mesenchymal transition (EMT) genes including TWIST1, SLUG, and SNAIL. This finding was corroborated by clinical observation that PER2 down-regulation was associated with poor prognosis in breast cancer patients. We further demonstrated that PER2 served as a transcriptional corepressor, which recruited polycomb proteins EZH2 and SUZ12 as well as HDAC2 to octamer transcription factor 1 (OCT1) (POU2F1) binding sites of the TWIST1 and SLUG promoters to repress expression of these EMT genes. Hypoxia, a condition commonly observed in tumors, caused PER2 degradation and disrupted the PER2 repressor complex, leading to activation of EMT gene expression. This result was further supported by clinical data showing a significant negative correlation between hypoxia and PER2. Thus, our findings clearly demonstrate the tumor suppression function of PER2 and elucidate a pathway by which hypoxia promotes EMT via degradation of PER2.

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