Article: MTSS1, a novel target of DNA methyltransferase 3B, functions as a tumor suppressor in hepatocellular carcinoma
| Title | MTSS1, a novel target of DNA methyltransferase 3B, functions as a tumor suppressor in hepatocellular carcinoma | ||||||
|---|---|---|---|---|---|---|---|
| Authors | Fan, H3 Chen, L1 2 Zhang, F3 Quan, Y3 Su, X3 Qiu, X3 Zhao, Z1 Kong, KL1 Dong, S1 Song, Y1 Chan, THM1 Guan, XY1 2 | ||||||
| Keywords | Animal experiment Cancer cell Cancer growth Cancer inhibition Carcinogenesis | ||||||
| Issue Date | 2012 | ||||||
| Publisher | Nature Publishing Group. The Journal's web site is located at http://www.nature.com/onc | ||||||
| Citation | Oncogene, 2012, v. 31 n. 18, p. 2298-2308 [How to Cite?] DOI: http://dx.doi.org/10.1038/onc.2011.411 | ||||||
| Abstract | DNA methyltransferase 3B (DNMT3B) mediates gene silencing via epigenetic mechanisms during hepatocellular carcinoma (HCC) progression. We aimed to identify novel targets of DNMT3B and their potential regulatory mechanisms in HCC. Metastasis suppressor 1 (MTSS1) was one of the DNMT3B targets and selected for further study. DNMT3B overexpression was detected in 81.25% of clinical HCC specimens and was negatively associated with MTSS1 in HCC cells and clinical samples. The underlying mechanism by which DNMT3B silences MTSS1 was studied using a combination of methylation-specific polymerase chain reaction (PCR) and bisulfite genome sequencing, chromatin immunoprecipitation-PCR and luciferase reporter assays. We found that the MTSS1 promoter region was sparsely methylated, and the methylation inhibitors failed to abolish DNMT3B-mediated MTSS1 silencing. DNMT3B protein bound directly to the 5'-flanking region (-865/-645) of the MTSS1 gene to inhibit its transcription. The functional role of MTSS1 was investigated using in vitro and in vivo tumorigenicity assays. As a result, MTSS1 exerted tumor suppressor effects and arrested cells in the G2/M phase, but not the G1/S phase of the cell cycle when it was depleted or overexpressed in HCC cells. Taken together, MTSS1, a novel target of DNMT3B, is repressed by DNMT3B via a DNA methylation-independent mechanism. MTSS1 was further characterized as a novel tumor suppressor gene in HCC. These findings highlight how DNMT3B regulates MTSS1, and such data may be useful for the development of new treatment options for HCC. | ||||||
| ISSN | 0950-9232 2011 Impact Factor: 6.373 2011 SCImago Journal Rankings: 1.216 | ||||||
| DOI | http://dx.doi.org/10.1038/onc.2011.411 | ||||||
| ISI Accession Number ID | WOS:000303610800005
Funding Information: This work was supported by The National Natural Science Foundation of China, No. 30971605, and in part by the Dr Cheng Yu Tung Fellowships 2007/08 under the HKU Li Ka Shing Faculty of Medicine. We are grateful to Professor Dianqing WU in UConn Health Center USA for providing siRNA expression vector. We are also grateful to Dr Stephanie Ma in Department of Pathology in University of Hong Kong for helping in MTSS1 antibody. | ||||||
| References | References in Scopus |
| dc.contributor.author | Fan, H | ||||||
|---|---|---|---|---|---|---|---|
| dc.contributor.author | Chen, L | ||||||
| dc.contributor.author | Zhang, F | ||||||
| dc.contributor.author | Quan, Y | ||||||
| dc.contributor.author | Su, X | ||||||
| dc.contributor.author | Qiu, X | ||||||
| dc.contributor.author | Zhao, Z | ||||||
| dc.contributor.author | Kong, KL | ||||||
| dc.contributor.author | Dong, S | ||||||
| dc.contributor.author | Song, Y | ||||||
| dc.contributor.author | Chan, THM | ||||||
| dc.contributor.author | Guan, XY | ||||||
| dc.date.accessioned | 2012-06-26T06:12:45Z | ||||||
| dc.date.available | 2012-06-26T06:12:45Z | ||||||
| dc.date.issued | 2012 | ||||||
| dc.description.abstract | DNA methyltransferase 3B (DNMT3B) mediates gene silencing via epigenetic mechanisms during hepatocellular carcinoma (HCC) progression. We aimed to identify novel targets of DNMT3B and their potential regulatory mechanisms in HCC. Metastasis suppressor 1 (MTSS1) was one of the DNMT3B targets and selected for further study. DNMT3B overexpression was detected in 81.25% of clinical HCC specimens and was negatively associated with MTSS1 in HCC cells and clinical samples. The underlying mechanism by which DNMT3B silences MTSS1 was studied using a combination of methylation-specific polymerase chain reaction (PCR) and bisulfite genome sequencing, chromatin immunoprecipitation-PCR and luciferase reporter assays. We found that the MTSS1 promoter region was sparsely methylated, and the methylation inhibitors failed to abolish DNMT3B-mediated MTSS1 silencing. DNMT3B protein bound directly to the 5'-flanking region (-865/-645) of the MTSS1 gene to inhibit its transcription. The functional role of MTSS1 was investigated using in vitro and in vivo tumorigenicity assays. As a result, MTSS1 exerted tumor suppressor effects and arrested cells in the G2/M phase, but not the G1/S phase of the cell cycle when it was depleted or overexpressed in HCC cells. Taken together, MTSS1, a novel target of DNMT3B, is repressed by DNMT3B via a DNA methylation-independent mechanism. MTSS1 was further characterized as a novel tumor suppressor gene in HCC. These findings highlight how DNMT3B regulates MTSS1, and such data may be useful for the development of new treatment options for HCC. | ||||||
| dc.description.nature | Link_to_subscribed_fulltext | ||||||
| dc.identifier.citation | Oncogene, 2012, v. 31 n. 18, p. 2298-2308 [How to Cite?] DOI: http://dx.doi.org/10.1038/onc.2011.411 | ||||||
| dc.identifier.citeulike | 9804841 | ||||||
| dc.identifier.doi | http://dx.doi.org/10.1038/onc.2011.411 | ||||||
| dc.identifier.epage | 2308 | ||||||
| dc.identifier.hkuros | 203484 | ||||||
| dc.identifier.isi | WOS:000303610800005
Funding Information: This work was supported by The National Natural Science Foundation of China, No. 30971605, and in part by the Dr Cheng Yu Tung Fellowships 2007/08 under the HKU Li Ka Shing Faculty of Medicine. We are grateful to Professor Dianqing WU in UConn Health Center USA for providing siRNA expression vector. We are also grateful to Dr Stephanie Ma in Department of Pathology in University of Hong Kong for helping in MTSS1 antibody. | ||||||
| dc.identifier.issn | 0950-9232 2011 Impact Factor: 6.373 2011 SCImago Journal Rankings: 1.216 | ||||||
| dc.identifier.issue | 18 | ||||||
| dc.identifier.pmid | 21909138 | ||||||
| dc.identifier.scopus | eid_2-s2.0-84861343066 | ||||||
| dc.identifier.spage | 2298 | ||||||
| dc.identifier.uri | http://hdl.handle.net/10722/150858 | ||||||
| dc.identifier.volume | 31 | ||||||
| dc.language | eng | ||||||
| dc.publisher | Nature Publishing Group. The Journal's web site is located at http://www.nature.com/onc | ||||||
| dc.publisher.place | United Kingdom | ||||||
| dc.relation.ispartof | Oncogene | ||||||
| dc.relation.references | References in Scopus | ||||||
| dc.subject | Animal experiment | ||||||
| dc.subject | Cancer cell | ||||||
| dc.subject | Cancer growth | ||||||
| dc.subject | Cancer inhibition | ||||||
| dc.subject | Carcinogenesis | ||||||
| dc.title | MTSS1, a novel target of DNA methyltransferase 3B, functions as a tumor suppressor in hepatocellular carcinoma | ||||||
| dc.type | Article |
Author Affiliations
- The University of Hong Kong
- Sun Yat-Sen University
- Ministry of Education China