A let-7b binding site SNP in the 3'-UTR of the Bcl-xL gene enhances resistance to 5-fluorouracil and doxorubicin in breast cancer cells.

A let-7b binding site SNP in the 3'-UTR of the Bcl-xL gene enhances resistance to 5-fluorouracil and doxorubicin in breast cancer cells.
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BCl-XL基因3'-UTR中的Let-7b结合位点SNP增强了乳腺癌细胞中对5-氟尿嘧啶和阿霉素的抗性。

DOI:
10.3892/ol.2015.2938
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发表时间:
2015-04
期刊:
影响因子:
2.9
通讯作者:
Lei X
Lei X
中科院分区:
医学4区
文献类型:
--
作者:
Wang T;Huang B;Guo R;Ma J;Peng C;Zu X;Tang H;Lei X

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获得性化疗耐药性的产生是成功治疗癌症的主要障碍。在乳腺癌细胞中,特大 B 细胞淋巴瘤 (Bcl-xL) 参与对各种化疗药物产生耐药性;因此,进行了初步的生物学预测,以确定 Bcl-xL 基因 3' 非翻译区 (UTR) 中 let-7b 的假定结合位点以及该结合区内的单核苷酸多态性 (SNP)。本研究调查了 SNP rs3208684 A>C 与乳腺癌细胞化疗药物耐药性之间的关联。数据表明let-7b负向调节Bcl-xL的表达,并且似乎使MCF-7细胞对化疗剂5-氟尿嘧啶(5-FU)和阿霉素敏感。此外,SNP rs3208684 A>C 被证明可以通过破坏 let-7b 与 Bcl-xL 3'-UTR 的结合来增强 Bcl-xL 蛋白表达,并且在 MCF-7 细胞中,在突变 Bcl-xL 3'-UTR(C 等位基因)存在的情况下,let-7b 的过表达显着增加了 5-FU 和阿霉素耐药性。因此,本研究结果表明,SNP rs3208684 A>C可能上调Bcl-xL蛋白表达,并通过减少let-7b与Bcl-xL 3'-UTR的结合来增强MCF-7细胞对5-FU和阿霉素的耐药性。
The development of acquired resistance to chemotherapy is a major obstacle in the successful treatment of cancer. In breast cancer cells, B-cell lymphoma-extra large (Bcl-xL) is involved in the development of resistance to various chemotherapeutic agents; therefore, preliminary biological prediction was performed to identify a putative binding site for let-7b in the 3′-untranslated region (UTR) of the Bcl-xL gene and a single nucleotide polymorphism (SNP) within this binding region. The present study investigated the association between the SNP rs3208684 A>C and chemotherapeutic agent resistance in breast cancer cells. The data indicated that let-7b negatively regulates the expression of Bcl-xL and appears to sensitize MCF-7 cells to the chemotherapeutic agents 5-fluorouracil (5-FU) and doxorubicin. Furthermore, the SNP rs3208684 A>C was demonstrated to enhance Bcl-xL protein expression by disrupting the binding of let-7b to the 3′-UTR of Bcl-xL and, in MCF-7 cells, overexpression of let-7b in the presence of a mutant Bcl-xL 3′-UTR (C allele) significantly increased 5-FU and doxorubicin resistance. Thus, the results of the present study demonstrate that the SNP rs3208684 A>C may upregulate Bcl-xL protein expression and enhance the resistance of the MCF-7 cells to 5-FU and doxorubicin by decreasing the binding of let-7b to the 3′-UTR of Bcl-xL.
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