Methylenetetrahydrofolate reductase C677T genotype affects promoter methylation of tumor-specific genes in sporadic colorectal cancer through an interaction with folate/vitamin B12 status

被引:52
作者
Mokarram, Pooneh [1 ]
Naghibalhossaini, Fakhraddin [1 ]
Firoozi, Mehdi Saberi [2 ,3 ]
Hosseini, Seyed Vahid [3 ,4 ]
Izadpanah, Ahmad [3 ,4 ]
Salahi, Heshmetalah [5 ,6 ]
Malek-Hosseini, Seyed Ali [5 ,6 ]
Talei, Abdoulrasool [7 ]
Mojallal, Mehra [8 ]
机构
[1] Shiraz Univ Med Sci, Dept Biochem, Sch Med, Shiraz 71345, Iran
[2] Shiraz Univ Med Sci, Dept Internal Med, Shiraz 71345, Iran
[3] Shiraz Univ Med Sci, Gastroenterohepatol Res Ctr, Shiraz 71345, Iran
[4] Shiraz Univ Med Sci, Dept Surg Colorectal Ward, Shiraz 71345, Iran
[5] Shiraz Univ Med Sci, Dept Surg, Namazee Hosp, Shiraz 71345, Iran
[6] Shiraz Univ Med Sci, Organ Transplantat Res Ctr, Namazee Hosp, Shiraz 71345, Iran
[7] Shiraz Univ Med Sci, Inst Canc Res, Shiraz 71345, Iran
[8] Dena Hosp, Pathol Lab, Shiraz 71345, Iran
关键词
Methylentetrahydrofolate reductase; folate; vitamin B-12; methylation; colorectal cancer;
D O I
10.3748/wjg.14.3662
中图分类号
R57 [消化系及腹部疾病];
学科分类号
摘要
AIM: To evaluate joint effects of Methylentetrahydrofolate reductase (MTHFR) C677T genotypes, and serum folate/vitamin B-12 concentrations on promoter methylation of tumor-associated genes among Iranian colorectal cancer patients. METHODS: We examined the associations between MTHFR C677T genotype, and promoter methylation of P16, hMLH1, and hMSH2 tumor-related genes among 151 sporadic colorectal cancer patients. The promoter methylation of tumor-related genes was determined by methylation-specific PCR. Eighty six patients from whom fresh tumor samples were obtained and 81 controls were also examined for serum folate and vitamin B-12, concentrations by a commercial radioimmunoassay kit. RESULTS: We found 29.1% of cases had tumors with at least one methylated gene promoter. In case-case comparison, we did not find a significant association between methylation in tumors and any single genotype. However, in comparison to controls with the CC genotype, an increased risk of tumor methylation was associated with the CT genotype (OR = 2.5; 95% CI, 1.1-5.6). In case-case comparisons, folate/vitamin B-12 levels were positively associated with tumor methylation. Adjusted odds ratios for tumor methylation in cases with high (above median) versus low (below median) serum folate/vitamin B-12 levels were 4.9 (95% CI, 1.4-17.7), and 3.9 (95% CI, 1.1-13.9), respectively. The frequency of methylated tumors was significantly higher in high methyl donor than low methyl donor group, especially in those with MTHFR CT (P = 0.01), and CT/TT (P = 0.002) genotypes, but not in those with the CC genotype (P = 1.0). CONCLUSION: We conclude that high concentrations of serum folate/vitamin B-12, levels are associated with the risk of promoter methylation in tumor-specific genes, and this relationship is modified by MTHFR C677T genotypes. (C) 2008 The WIG Press. All rights reserved.
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收藏
页码:3662 / 3671
页数:10
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