Dev Cell:改变思路:一个可以逆转癌细胞为正常细胞的蛋白

2019-08-20 小通 生物通

犹他大学Huntsman癌症研究所(HCI)的科学家们发现了一种可以更有效地治疗胰腺癌的新方法。

犹他大学Huntsman癌症研究所(HCI)的科学家们发现了一种可以更有效地治疗胰腺癌的新方法。

这一新成果公布在Developmental Cell杂志上,由犹他大学Nathan M. Krah领导完成。



胰腺癌是最致命的癌症之一。首先它很难诊断,通常在它扩散到身体的其他部位之后才被发现,这时几乎无法治愈了,而且与大多数癌症一样,胰腺癌的发展也是由于健康细胞的遗传变化,使得这些细胞失去控制。这些遗传变化无法逆转,不会对抗癌药物产生应答。

Krah解释道,“我们体内的所有细胞都有一项特定的工作要做。我们实验室以前的研究工作指出癌细胞会失去正常工作能力。而在这项研究中,我们希望了解如果胰腺细胞知道这会改变它们的工作,那么它会做些什么?”

为此他们寻找了另外一个方向——PTF1A,这是胰腺细胞用来抑制遗传变化,保持“分化”或健康的蛋白的一个作用因子。

利用小鼠模型,研究人员将引起癌症的突变引入正常细胞。当发生胰腺癌时,PTF1A总是关闭。研究人员能够阻止这种情况,他们发现保持PTF1A可以完全阻断胰腺癌细胞的形成。研究人员还发现,当PTF1A重新开启时,早期癌细胞会恢复成正常的胰腺细胞,此外PTF1A还阻断了晚期癌细胞的生长。

进一步研究人员还分析了人胰腺癌细胞系,对培养皿中培养的细胞进行了类似的实验。结果发现,在大约一半的细胞系中,打开PTF1A可以阻止癌症的生长。这一结果令人惊讶! “PTF1A使胰腺癌细胞表现正常,这种特性与其激活分化的能力相关。”

Krah说,这项研究的优势在于展现了胰腺分化是在各种模型和环境中预防和逆转癌症发生的有效方法。“我们改变了分化的条件和时间,这样就总能获得相同的结果——PTF1A的表达足以阻止癌症的发生和发展。”

Krah认为从长远来看,这种发展对于胰腺癌患者来说是令人鼓舞的,但这并不能在近期就用于治疗胰腺癌。“我认为,一旦我们了解了胰腺癌早期如何关闭这种分化状态,就可以更好地了解如何恢复胰腺癌。但我们可能需要几年才能将我们的研究结果应用于人类患者,”他说。

从更广泛的角度来看,研究人员也表示希望了解像PTF1A这样的因子是否可以抑制任何肿瘤起始都发生分化的器官中的癌症。

原始出处:Krah NM1, Narayanan SM1, Yugawa DE1, et al. Prevention and Reversion of Pancreatic Tumorigenesis through a Differentiation-Based Mechanism. Dev Cell. 2019 Aug 13. 

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    2019-09-04 fzwish20000
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    2020-03-02 维他命
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    2019-08-31 thm112988

    0

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    2019-08-22 yxch36