PNAS:致癌基因PIK3CA以剂量依赖性方式促进细胞干性

2019-04-06 海北 MedSci原创

编码PI3激酶(PI3K)的p110α催化亚基的PIK3CA基因在癌症和PIK3CA相关的过度生长障碍(PROS)中被突变激活。

编码PI3激酶(PI3K)的p110α催化亚基的PIK3CA基因在癌症和PIK3CA相关的过度生长障碍(PROS)中被突变激活。

为了确定遗传PIK3CA激活在与PROS和癌症相关的发育背景中的后果,研究人员设计了具有PIK3CA H1047R的杂合或纯合敲入的同基因人诱导多能干细胞(iPSC),而杂合的iPSC仍然与野生型细胞大致相似。 

PIK3CA H1047R的纯合性引起广泛的癌症样转录重塑,上皮形态的部分丧失,干性标志物的上调,以及体外和体内对所有三个胚层的分化受损。

PIK3CA相关癌症的遗传分析显示,64%具有多种致癌PIK3CA拷贝(39%)或额外的PI3K信号传导途径激活“命中”(25%)。这与PIK3CA突变在癌症中杂合发生的普遍观点形成对比。

因此,该研究结果表明,PI3K活性阈值决定了致癌PIK3CA活化的病理后果,并提供了该途径在人多能干细胞中的特定作用的见解。


原始出处:

Madsen RR et al. Oncogenic PIK3CA promotes cellular stemness in an allele dose-dependent manner. PNAS, 2019; doi: 10.1073/pnas.1821093116.


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    2019-12-29 drwjr
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    2019-11-22 xinmeili
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    2019-04-08 jambiya
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