PMID- 28656302 OWN - NLM STAT- MEDLINE DCOM- 20180417 LR - 20190221 IS - 1791-244X (Electronic) IS - 1107-3756 (Print) IS - 1107-3756 (Linking) VI - 40 IP - 3 DP - 2017 Sep TI - Inactivation of MSH3 by promoter methylation correlates with primary tumor stage in nasopharyngeal carcinoma. PG - 673-678 LID - 10.3892/ijmm.2017.3044 [doi] AB - The aim of this study was to investigate the inactivation of the MutS homolog human 3 (MSH3) gene by promoter methylation in nasopharyngeal carcinoma (NPC). Methylation‑specific PCR, semi‑quantitative reverse transcription PCR and immunohistochemical analysis were used to detect methylation and the mRNA and protein expression levels of MSH3 in 54 cases of NPC tissues and 16 cases of normal nasopharyngeal epithelial (NNE) tissues. The association between promoter methylation and mRNA expression, and the mRNA and protein expression of the gene and clinical factors was analyzed. The promoter methylation of MSH3 was detected in 50% (27/54) of the primary tumors, but not in the 16 NNE tissues. The mRNA and protein expression levels were significantly decreased in the 54 cases of human NPC as compared to the 16 NNE tissues (P<0.05). The MSH3‑methylated cases exhibited significantly lower mRNA and protein expression levels than the unmethylated cases (P<0.05). The MSH3 mRNA and protein expression levels were significantly associated with the variable T stage (P<0.05); however, they did not correlate with the age and sex of the patients, or with the N stage, TNM classification or histopathological subtype (P>0.05). On the whole, MSH3 was frequently inactivated by promoter methylation and its mRNA and protein expression correlated with the primary tumor stage in NPC. FAU - Ni, Haifeng AU - Ni H AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. FAU - Jiang, Bo AU - Jiang B AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. FAU - Zhou, Zhen AU - Zhou Z AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. FAU - Yuan, Xiaoyang AU - Yuan X AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. FAU - Cao, Xiaolin AU - Cao X AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. FAU - Huang, Guangwu AU - Huang G AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. FAU - Li, Yong AU - Li Y AD - Department of Otolaryngology, Affiliated Hangzhou First People's Hospital of Nanjing Medical University, Hangzhou, Zhejiang 310006, P.R. China. LA - eng PT - Journal Article DEP - 20170627 PL - Greece TA - Int J Mol Med JT - International journal of molecular medicine JID - 9810955 RN - 0 (DNA, Neoplasm) RN - 0 (MSH3 protein, human) RN - 0 (MutS Homolog 3 Protein) RN - 0 (Neoplasm Proteins) SB - IM MH - Carcinoma/genetics/*metabolism/pathology MH - *DNA Methylation MH - DNA, Neoplasm/genetics/*metabolism MH - Female MH - *Gene Expression Regulation, Neoplastic MH - Humans MH - Male MH - MutS Homolog 3 Protein/*biosynthesis/genetics MH - Nasopharyngeal Carcinoma MH - Nasopharyngeal Neoplasms/genetics/*metabolism/pathology MH - Neoplasm Proteins/*biosynthesis/genetics MH - Neoplasm Staging MH - *Promoter Regions, Genetic PMC - PMC5547962 EDAT- 2017/06/29 06:00 MHDA- 2018/04/18 06:00 PMCR- 2017/06/27 CRDT- 2017/06/29 06:00 PHST- 2015/12/07 00:00 [received] PHST- 2017/06/22 00:00 [accepted] PHST- 2017/06/29 06:00 [pubmed] PHST- 2018/04/18 06:00 [medline] PHST- 2017/06/29 06:00 [entrez] PHST- 2017/06/27 00:00 [pmc-release] AID - ijmm-40-03-0673 [pii] AID - 10.3892/ijmm.2017.3044 [doi] PST - ppublish SO - Int J Mol Med. 2017 Sep;40(3):673-678. doi: 10.3892/ijmm.2017.3044. Epub 2017 Jun 27.