首页> 美国卫生研究院文献>Oncotarget >Chronic chemotherapeutic stress promotes evolution of stemness and WNT/beta-catenin signaling in colorectal cancer cells: implications for clinical use of WNT-signaling inhibitors
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Chronic chemotherapeutic stress promotes evolution of stemness and WNT/beta-catenin signaling in colorectal cancer cells: implications for clinical use of WNT-signaling inhibitors

机译:慢性化学疗法应激促进大肠癌细胞的干性和WNT /β-catenin信号传导的进化:对WNT信号抑制剂临床应用的意义

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摘要

Most solid tumors contain a subfraction of cells with stem/progenitor cell features. Stem cells are naturally chemoresistant suggesting that chronic chemotherapeutic stress may select for cells with increased “stemness”. We carried out a comprehensive molecular and functional analysis of six independently selected colorectal cancer (CRC) cell lines with acquired resistance to three different chemotherapeutic agents derived from two distinct parental cell lines. Chronic drug exposure resulted in complex alterations of stem cell markers that could be classified into three categories: 1) one cell line, HT-29/5-FU, showed increased “stemness” and WNT-signaling, 2) three cell lines showed decreased expression of stem cell markers, decreased aldehyde dehydrogenase activity, attenuated WNT-signaling and lost the capacity to form colonospheres and 3) two cell lines displayed prominent expression of ABC transporters with a heterogeneous response for stem cell markers. While WNT-signaling could be attenuated in the HT-29/5-FU cells by the WNT-signaling inhibitors ICG-001 and PKF-118, this was not accompanied by any selective growth inhibitory effect suggesting that the cytotoxic activity of these compounds is not directly linked to WNT-signaling inhibition. We conclude that classical WNT-signaling inhibitors have toxic off-target activities that need to be addressed for clinical development.
机译:大多数实体瘤包含具有干/祖细胞特征的亚细胞部分。干细胞具有天然的化学抗性,这表明慢性化疗压力可能会选择“干性”增加的细胞。我们对六个独立选择的结直肠癌(CRC)细胞系进行了全面的分子和功能分析,这些细胞系对源自两种不同亲本细胞系的三种不同化学治疗剂具有抗性。慢性药物暴露导致干细胞标记物的复杂改变,可分为三类:1)一种细胞系HT-29 / 5-FU显示出“干”和WNT信号增强,2)三个细胞系显示出减少。干细胞标志物的表达,醛脱氢酶活性降低,WNT信号减弱并丧失形成结肠球的能力,并且3)两种细胞系显示了ABC转运蛋白的突出表达,并对干细胞标志物具有异质反应。虽然WNT信号抑制剂ICG-001和PKF-118可以减弱HT-29 / 5-FU细胞中的WNT信号,但并没有任何选择性的生长抑制作用,这表明这些化合物的细胞毒活性是不与WNT信号抑制直接相关。我们得出结论,经典的WNT信号抑制剂具有有毒的脱靶活性,需要在临床开发中加以解决。

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