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三叶草王

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MicroRNAs (miRNAs), a class of small noncoding RNAs, play important roles in tumorigenesis by targeting mRNAs [13].DNMT3A and -B are directly regulated by the miRNA (miR)-29 family (29a, 29b, and 29c) [14]. The expression of MiR-29 family members is down-regulated in lung cancer[15], which has been
associated with promoter methylation and transcription factor regulation [16,17]. However, the association between DNMT upregulation and over-methylation of the WIF-1 gene and whether restoration of miR-29s suppresses Wnt signaling by modulating the methylation of WIF-1 remains unclear. In addition, the potential self-regulation of the expression of miR-29 family members through DNMT3A and -B needs clarification. In the present study, we investigated the roles of three DNMTs
in the expression of WIF-1 and linked miR-29s to the Wnt/b-catenin signaling pathway, investigating their effects on cell growth and apoptosis. We showed that the expression of miR-29a and miR-29b is regulated by DNMT3A and DNMT3B, suggesting the existence of a positive feedback loop. Our findings shed light on
the role of aberrant Wnt signaling in NSCLC.
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RXMCDM: 金币+1, 多谢应助! 2014-08-25 13:38:55
三叶草王: 金币+10, 翻译EPI+1, ★★★★★最佳答案 2014-08-25 18:47:49
miRNA是一类小分子非编码RNAs,通过针对mRNA而在肿瘤发生中发挥重要作用[13]。DNMT3A和DNMT3B直接受miRNA(miR)-29家族(29a,29b和29c)的调节 [14]。在肺癌中,miR-29家族成员被向下调节 [15],并与启动子甲基化和转录因子调节相关 [16,17]。然而,DNMT的向上调节与WIF-1基因的过度甲基化之间的关系,以及通过恢复miR-29s而抑制Wnt信号途经是否通过调节WIF-1的甲基化目前尚不清楚。另外,通过DNMT3A和DNMT3B miR-29家族成员是否具有自我调节的潜力(可能性)也需要澄清。本文(本研究)研究了三种DNMTs在WIF-1表达中的作用,以及miR-29s与Wnt/β-catenin信号通路间的关系,进而研究它们在细胞生长和凋亡中的作用。我们(的结果)显示,DNMT3A和DNMT3B对miR-29a和miR-29b的表达有调节作用,提示有一种正向反馈环路存在。我们的研究结果为(了解)Wnt信号通路异常在NSCLC中的作用提供了线索。
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