miR-30a attenuates drug sensitivity to 5-FU by modulating cell proliferation possibly by downregulating cyclin E2 in oral squamous cell carcinoma.

miR-30a attenuates drug sensitivity to 5-FU by modulating cell proliferation possibly by downregulating cyclin E2 in oral squamous cell carcinoma.
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DOI:
10.1016/j.bbrep.2021.101114
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发表时间:
2021-12
影响因子:
2.7
通讯作者:
Nakayama H
Nakayama H
中科院分区:
其他
文献类型:
--
作者:
Kawahara K;Nagata M;Yoshida R;Hirosue A;Tanaka T;Matsuoka Y;Arita H;Nakashima H;Sakata J;Yamana K;Kawaguchi S;Gohara S;Nagao Y;Hirayama M;Takahashi N;Hirayama M;Nakayama H

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我们旨在利用两种5 - 氟尿嘧啶(5 - FU)耐药的口腔鳞状细胞癌(OSCC)细胞系及其亲本细胞系,确定影响口腔鳞状细胞癌对5 - FU药物敏感性的微小RNA(miRNA)的功能作用。miRNA微阵列数据显示,miR - 30a在两种耐药细胞系中显著上调。因此,我们研究了miR - 30a对5 - FU敏感性的影响及其分子机制。在亲本OSCC细胞中稳定过表达miR - 30a会降低细胞增殖,并减弱对5 - FU的药物敏感性。细胞周期分析表明,miR - 30a过表达增加了G1期细胞的比例,降低了S期细胞的比例。使用小干扰RNA(siRNA)敲低miR - 30a可逆转miR - 30a过表达的作用。利用miR - 30a过表达细胞系进行的DNA微阵列分析以及TargetScan数据库搜索表明,细胞周期蛋白E2(CCNE2)是miR - 30a的一个靶标。荧光素酶报告基因检测证实,miR - 30a模拟物与CCNE2的3'非翻译区(3' UTR)中的特定结合位点相互作用。在OSCC细胞中使用siRNA敲低CCNE2会降低对5 - FU的药物敏感性,这与miR - 30a过表达细胞的情况类似。这些发现表明,OSCC中的miR - 30a可能是5 - FU耐药肿瘤的一种新型生物标志物,也是对抗耐药性的一个治疗靶点。 miR - 30a过表达增加了G1期细胞的比例。 使用si - RNA敲低miR - 30a可逆转miR - 30a过表达的作用。 在OSCC细胞中使用si - RNA敲低CCNE2会降低对5 - FU的药物敏感性。
We aimed to determine the functional role of the miRNA, which affects drug sensitivity to 5-FU in oral squamous cell carcinoma (OSCC), using two types of 5-FU-resistant and parental OSCC cell lines. MiRNA microarray data showed that miR-30a was significantly upregulated in two resistant cell lines. Therefore, we investigated the effects and molecular mechanism of miR-30a on 5-FU sensitivity. Stable overexpression of miR-30a in parental OSCC cells decreased cell proliferation and attenuated drug sensitivity to 5-FU. Cell cycle analysis indicated that miR-30a overexpression increased the proportion of G1 phase cells and decreased the proportion of S phase cells. MiR-30a knockdown using siRNA reversed the effects of miR-30a overexpression. DNA microarray analysis using miR-30a-overexpressing cell lines and a TargetScan database search showed that cyclin E2 (CCNE2) is a target of miR-30a. A luciferase reporter assay confirmed that a miR-30a mimic interacted with the specific binding site in the 3' UTR of CCNE2. CCNE2 knockdown with siRNA in OSCC cells yielded decreased drug sensitivity to 5-FU, similar to miR-30a overexpressing cells. These findings suggest that miR-30a in OSCC may be a novel biomarker of 5-FU-resistant tumors, as well as a therapeutic target for combating resistance. miR-30a overexpression increased the proportion of G1 phase cells. miR-30a knockdown using si-RNA reversed the effects of miR-30a overexpression. CCNE2 knockdown with si-RNA in OSCC cells decreased drug sensitivity to 5-FU.
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