Let-7 Sensitizes KRAS Mutant Tumor Cells to Chemotherapy.

Let-7 Sensitizes KRAS Mutant Tumor Cells to Chemotherapy.
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DOI:
10.1371/journal.pone.0126653
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Tan C
Tan C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Dai X;Jiang Y;Tan C

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KRAS是人类癌症中最常见的突变癌基因,与不良预后和耐药性相关。Let-7是一个肿瘤抑制microRNA家族,经常在实体瘤中受到抑制,其中KRAS突变非常普遍。在这项研究中,我们研究了let-7作为化疗增敏剂的潜在用途。我们发现let-7 b补充选择性地使KRAS突变肿瘤细胞对紫杉醇和吉西他滨的细胞毒性敏感。let-7 b模拟物的转染下调突变型KRAS的表达,但不下调野生型KRAS的表达。let-7 b模拟物与紫杉醇或吉西他滨的组合同时减少了MEK/ERK和PI 3 K/AKT信号传导,触发了细胞凋亡的发生,并逆转了KRAS突变肿瘤细胞中的上皮-间充质转化。此外,let-7 b补充还下调了β-微管蛋白III和核糖核苷酸还原酶亚基M2的表达,这两种蛋白质已知分别介导肿瘤对紫杉醇和吉西他滨的耐药性。Let-7可能代表一类新的用于治疗KRAS突变型肿瘤的化疗增敏剂。
KRAS is the most commonly mutated oncogene in human cancers and is associated with poor prognosis and drug resistance. Let-7 is a family of tumor suppressor microRNAs that are frequently suppressed in solid tumors, where KRAS mutations are highly prevalent. In this study, we investigated the potential use of let-7 as a chemosensitizer. We found that let-7b repletion selectively sensitized KRAS mutant tumor cells to the cytotoxicity of paclitaxel and gemcitabine. Transfection of let-7b mimic downregulated the expression of mutant but not wild-type KRAS. Combination of let-7b mimic with paclitaxel or gemcitabine diminished MEK/ERK and PI3K/AKT signaling concurrently, triggered the onset of apoptosis, and reverted the epithelial-mesenchymal transition in KRAS mutant tumor cells. In addition, let-7b repletion downregulated the expression of β-tubulin III and ribonucleotide reductase subunit M2, two proteins known to mediate tumor resistance to paclitaxel and gemcitabine, respectively. Let-7 may represent a new class of chemosensitizer for the treatment of KRAS mutant tumors.
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