Oncogene:致命脑癌的治疗找到新靶点

2016-06-16 佚名 不详

一项新研究表明阻断肿瘤细胞内一种叫做PRMT5的酶可能是有效治疗成胶质细胞瘤的一种潜在方法,成胶质细胞瘤是一种恶性程度很高并且非常致命的脑癌。 据估计在2015年美国有超过11880例新发成胶质细胞瘤病例,尽管目前有手术,放疗以及药物治疗等治疗方法,但是病人的整体生存时间仍然只有12到15个月,因此非常急需更加有效的治疗方法。 成胶质细胞瘤治疗效果不好的一个原因在于这种类型的肿瘤除了包含

一项新研究表明阻断肿瘤细胞内一种叫做PRMT5的酶可能是有效治疗成胶质细胞瘤的一种潜在方法,成胶质细胞瘤是一种恶性程度很高并且非常致命的脑癌。

据估计在2015年美国有超过11880例新发成胶质细胞瘤病例,尽管目前有手术,放疗以及药物治疗等治疗方法,但是病人的整体生存时间仍然只有12到15个月,因此非常急需更加有效的治疗方法。

成胶质细胞瘤治疗效果不好的一个原因在于这种类型的肿瘤除了包含已分化并且对治疗方法具有敏感性的肿瘤细胞外,还包含一些未成熟未分化并具有干细胞样的细胞,这些细胞能够抵抗放疗和化疗。

美国俄亥俄州立大学的研究人员进行了该研究,在研究中研究人员利用从病人体内获得的原代肿瘤细胞以及动物模型检测了PRMT5缺失如何影响成熟以及未成熟肿瘤细胞的生存,增殖,凋亡以及衰老。他们发现抑制PRMT5(protein arginine methyltransferase 5)表达能够迫使细胞进入衰老过程,延缓甚至阻止肿瘤生长。

之前研究发现PRMT5能够通过甲基化修饰调节基因转录及其他细胞过程,该分子在成胶质细胞瘤中过表达与疾病的恶性程度存在显著相关性。

研究人员发现PRMT5能够抑制抑癌基因PTEN的表达,并且在不同分化状态的细胞中PRMT5发挥的作用也存在不同,在未分化的细胞中,PRMT5能够促进细胞增殖,而在已经分化的成胶质细胞瘤细胞中该分子对于癌细胞存活具有非常重要的作用。

相关研究结果发表在国际学术期刊Oncogene上。

研究人员表示:“我们的研究表明抑制PRMT5既能影响成胶质细胞瘤中的成熟肿瘤细胞也能影响未成熟的肿瘤细胞,因此开发靶向PRMT5的抑制剂可以为癌症患者提供一个新的潜在治疗方法。”

原始出处:

Y K Banasavadi-Siddegowda, L Russell, E Frair, V A Karkhanis, T Relation, J Y Yoo, J Zhang, S Sif, J Imitola, R Baiocchi and B Kaur. PRMT5–PTEN molecular pathway regulates senescence and self-renewal of primary glioblastoma neurosphere cells.doi:10.1038/onc.2016.199 

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    2017-05-17 cy0324
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    2016-06-18 沉心多思

    好文章,值得学习

    0

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    2016-06-18 lsndxfj
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    2016-06-18 heli0118

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