Nature子刊:单个基因就可抑制肿瘤形成!

2016-06-05 佚名 生物谷

磷酸酶-张力蛋白(Pten)是一种肿瘤抑制子,其在20%至25%的癌症患者中都处于缺失状态,近日来自梅奥诊所的研究人员通过研究发现,当细胞在分裂成为两个子代细胞的过程中,Pten可以通过维持染色体数目的完整来抵御机体肿瘤的形成,相关研究刊登于国际杂志Nature Cell Biology上。 文章中,研究者发现,通常在癌症患者机体中缺失的Pten蛋白的最后三个氨基酸对于形成完整的有丝分裂纺锤体非

磷酸酶-张力蛋白(Pten)是一种肿瘤抑制子,其在20%至25%的癌症患者中都处于缺失状态,近日来自梅奥诊所的研究人员通过研究发现,当细胞在分裂成为两个子代细胞的过程中,Pten可以通过维持染色体数目的完整来抵御机体肿瘤的形成,相关研究刊登于国际杂志Nature Cell Biology上。

文章中,研究者发现,通常在癌症患者机体中缺失的Pten蛋白的最后三个氨基酸对于形成完整的有丝分裂纺锤体非常重要,而有丝分裂纺锤体是染色体进行准确分裂的关键结构。Pten蛋白是人类机体中继p53之后最为重要的肿瘤抑制子,科学家们认为,Pten蛋白的磷酸酶活性可以中和PI3激酶的活性,一旦Pten蛋白失去功能就会使得AKT酶出现不受控制地激活,从而引发肿瘤形成;AKT酶可以刺激细胞增殖及存活,通常在人类肿瘤组织中处于过度激活状态。

很多年来,研究者们推测,在癌症患者中发现的Pten缺失会导致细胞染色体重新改组,但如今研究者仍然不知道上述过程发生的分子机制,以及这一过程如何促进癌症发展,本文中来自梅奥诊所的科学家就给出了确切的答案。

研究者Jan van Deursen博士指出,我们发现,Pten蛋白可以定位到有丝分裂纺锤体上来招募马达蛋白EG5,随后分离纺锤体来形成完全对称的两极纺锤体,进而完成染色体的准确分离过程。Pten蛋白招募马达蛋白EG5的过程涉及一种名为Dlg1的蛋白的作用,Dlg1是一种EG5结合蛋白,其可以将Pten蛋白的最后三个氨基酸运输到纺锤体一极,更为重要的是,缺失这些氨基酸的突变小鼠会出现异常的染色体数目,并且引发肿瘤高频率出现的情况。

最后研究者表示,本文研究或可帮助预测对EG5抑制药物高度敏感的肿瘤组织,而且也为后期开发新型的靶向癌症疗法治疗多种癌症提供思路和希望。

原始出处

Janine H. van Ree, Hyun-Ja Nam, Karthik B. Jeganathan, Arun Kanakkanthara & Jan M. van Deursen .Pten regulates spindle pole movement through Dlg1-mediated recruitment of Eg5 to centrosomes.Nature Cell Biology.2016

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    2016-09-07 liye789132251
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    2016-06-06 milkshark

    是这样啊

    0

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    2016-06-06 milkshark

    很不错的

    0

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    2016-06-05 沉心多思

    不错的文章,多学习

    0

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