ASCO 2016:Wnt信号通路或在年轻结直肠癌患者发病中扮演重要角色

2016-06-06 佚名 生物谷

当增加筛查持续降低结直肠癌总体发病率的同时,50岁以下结直肠癌患者的发病率却一直在增加,而且结直肠癌在年轻患者中也越来越成为一种常见的恶性疾病。近日,来自科罗拉多大学医学院的研究人员就揭示了在年轻患者中结直肠癌危险性增加的一种可能性原因,年轻患者和老年患者机体中往往存在很多相同的遗传改变,而年轻患者机体中更容易出现基因改变,比如Wnt信号通路发生改变,这种信号通路可以驱动癌症干细胞存活、生长及增殖

当增加筛查持续降低结直肠癌总体发病率的同时,50岁以下结直肠癌患者的发病率却一直在增加,而且结直肠癌在年轻患者中也越来越成为一种常见的恶性疾病。近日,来自科罗拉多大学医学院的研究人员就揭示了在年轻患者中结直肠癌危险性增加的一种可能性原因,年轻患者和老年患者机体中往往存在很多相同的遗传改变,而年轻患者机体中更容易出现基因改变,比如Wnt信号通路发生改变,这种信号通路可以驱动癌症干细胞存活、生长及增殖。

研究者Christopher Lieu博士说道,和Wnt信号通路相关的基因在年轻结直肠癌患者中更易于发生频繁突变,我们在研究中分析了4699份结直肠癌组织样本的遗传特性,随后解析了50岁以上老年患者及50岁以下年轻患者机体样本中的遗传差异特性;尽管年轻和老年患者机体的癌症组织共享着相同的遗传改变,但年轻患者机体中的CTNNB1和FAM123B基因更易于发生改变,而这些基因在Wnt信号通路中扮演着重要角色。

Wnt信号通路类似于很多信号通路,其可以控制基因转录,即特殊基因转录翻译成为蛋白质的效率和机制;同时Wnt信号通路在机体胚胎发育期间也发挥着关键作用,可以帮助调节干细胞分化成为特殊类型的机体细胞,很多癌症会死灰复燃并且会“强占”发育中的干细胞通路来促进癌症干细胞生长成为肿瘤组织。

基因CTNNB1和FAM123B在促进年轻结直肠癌患者机体肿瘤组织的侵袭性上扮演着重要角色,而如果有可能使得这两个基因的表达发生沉默,那么研究人员或许就可能合理地控制Wnt信号通路,如今研究人员就正在进行一项人类临床试验来检测Wnt信号抑制剂OMP-54F28和一系列额外的Wnt抑制剂的效果和作用机制。

最后Lieu说道,这项研究或可帮助我们寻找可以最有效治疗结直肠癌的新型药物,当然这些新型药物有可能是Wnt信号抑制剂,而Wnt信号通路在年轻的结直肠癌患者中也发挥着重要作用。

原始出处:
University of Colorado Anschutz Medical Campus.Wnt stem cell signaling pathway implicated in colorectal cancer in patients under 50.June 4, 2016


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    2016-11-23 quxin068
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    2016-06-08 zhwj

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