A miR-200b/200c/429-Binding Site Polymorphism in the 3′ Untranslated Region of the AP-2α Gene Is Associated with Cisplatin Resistance

被引:69
|
作者
Wu, Yuan [1 ]
Xiao, Yuzhong [1 ]
Ding, Xiaofeng [1 ]
Zhuo, Yiming [1 ]
Ren, Peng [1 ]
Zhou, Chang [1 ]
Zhou, Jianlin [1 ]
机构
[1] Hunan Normal Univ, Coll Life Sci, Minist Educ, Key Lab Prot Chem & Dev Biol, Changsha, Hunan, Peoples R China
来源
PLOS ONE | 2011年 / 6卷 / 12期
基金
中国国家自然科学基金;
关键词
ACTIVATOR PROTEIN 2-ALPHA; TRANSCRIPTION FACTOR; CANCER-CELLS; APOPTOSIS INDUCTION; E-CADHERIN; GROWTH; EXPRESSION; FAMILY; AP-2; TUMORIGENICITY;
D O I
10.1371/journal.pone.0029043
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The transcription factor AP-2 alpha functions as a tumor suppressor by regulating various genes that are involved in cell proliferation and apoptosis. Chemotherapeutic drugs including cisplatin induce post-transcriptionally endogenous AP-2 alpha, which contributes to chemosensitivity by enhancing therapy-induced apoptosis. microRNAs (miRNAs) miR-200b, miR-200c and miR-429 (miR-200b/200c/429) are up-regulated in endometrial and esophageal cancers, and their overexpression correlates with resistance to cisplatin treatment. Using computational programs, we predicted that the 3' untranslated region (UTR) of AP-2 alpha gene contains a potential miRNA response element (MRE) for the miR-200b/200c/429 family, and the single nucleotide polymorphism (SNP) site rs1045385 (A or C allele) resided within the predicted MRE. Luciferase assays and Western blot analysis demonstrated that the miR-200b/200c/429 family recognized the MRE in the 3' UTR of AP-2 alpha gene and negatively regulated the expression of endogenous AP-2 alpha proteins. SNP rs1045385 A. C variation enhanced AP-2 alpha expression by disrupting the binding of the miR-200b/200c/429 family to the 3' UTR of AP-2 alpha. The effects of the two polymorphic variants on cisplatin sensitivity were determined by clonogenic assay. The overexpression of AP-2 alpha with mutant 3' UTR (C allele) in the endometrial cancer cell line HEC-1A, which has high levels of endogenous miR-200b/200c/429 and low levels of AP-2 alpha protein, significantly increased cisplatin sensitivity, but overexpression of A allele of AP-2 alpha has no significant effects, compared with mock transfection. We concluded that miR-200b/200c/429 induced cisplatin resistance by repressing AP-2 alpha expression in endometrial cancer cells. The SNP (rs1045385) A. C variation decreased the binding of miR-200b/200c/429 to the 3' UTR of AP-2 alpha, which upregulated AP-2 alpha protein expression and increased cisplatin sensitivity. Our results suggest that SNP (rs1045385) may be a potential prognostic marker for cisplatin treatment.
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页数:5
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