Abstract
Histone methylations play important roles in human cancer metastasis. Enhancer of zeste homolog 2 (EZH2) is a key component of the polycomb repressor complex 2, which is responsible for histone H3K27 methylation. EZH2 is overexpressed in lung cancer and epigenetically silences tumor suppressor genes. Here, we showed that EZH2 was up-regulated in lung cancer and had a positive correlation with pathologic stage, nodal involvement in lung cancer patients. Moreover, overexpression of EZH2 was correlated with reduced tissue inhibitor of metalloproteinase-3 (TIMP-3) expression, which was shown to be negatively associated with tumor metastasis. Of note, overall survival time of patients with high EZH2/low TIMP-3 expression was significantly shorter than that of patients with low EZH2/high TIMP-3 (P = 0.031). RNA interfering and pharmacologic inhibition of EZH2 reduced histone H3 lysine 27 tri-methylation level and increased TIMP-3 expression level. Knockdown of EZH2 by siRNA significantly reduced A549 cancer cell migration. In contrast, reduction of TIMP-3 in A549 cells partially rescued EZH2 deficiency-induced loss of cell migration capacity. Taken together, our findings indicate that EZH2 accelerates cancer cell migration, in part, via the repression of TIMP-3 expression, suggesting a potential mechanism by which EZH2 promotes lung cancer progression and metastasis.
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Abbreviations
- NSCLC:
-
Non-small cell lung cancer
- EZH2:
-
Enhancer of zeste homolog 2
- PRC2:
-
Polycomb repressor complex 2
- DZNep:
-
3-Deazanaplanocin A
- qRT-PCR:
-
Quantitative reverse transcription polymerase chain reaction
- H3K27me3:
-
H3 lysine 27 tri-methylation
- TIMP-3:
-
Tissue inhibitor of metalloproteinase-3
- IHC:
-
Immunohistochemistry
- siNC:
-
siRNA negative control
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Acknowledgments
The study was supported by the Ministry of Science and Technology of the People’s Republic of China (2011CB944104 and 2010CB945101), the National Natural Science Foundation (81172009 and 81372168), Doctoral Fund of Ministry of Education of China (20110091120028), and Fundamental Research Funds for the Central Universities (090314340001), and a grant from “Twelve-Five Plan” the Major Program of Nanjing Medical Science and Technique Development Foundation (Molecular Mechanism Study on Metastasis and Clinical Efficacy Prediction of Non-small Cell Lung Cancer) and Third Level Training Program of Young Talent Project of Nanjing Health, Nanjing Medical Science and Technology Development Project (No. ZDX12013), and Young Professionals Foundation of Nanjing Chest Hospital.
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Chunhua Xu and Zhibo Hou equally contributed to this work.
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Xu, C., Hou, Z., Zhan, P. et al. EZH2 regulates cancer cell migration through repressing TIMP-3 in non-small cell lung cancer. Med Oncol 30, 713 (2013). https://doi.org/10.1007/s12032-013-0713-6
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DOI: https://doi.org/10.1007/s12032-013-0713-6