Nature Cell Biol:微核糖核酸或可“保护”癌细胞

2017-09-23 刘婷婷 环球网

美国索尔克生物研究所 (Salk Institute) 的研究员发现,有两种微核糖核酸 (microRNA) 能帮助肿瘤细胞躲过抗肿瘤免疫,并加速其扩散。

美国索尔克生物研究所 (Salk Institute) 的研究员发现,有两种微核糖核酸 (microRNA) 能帮助肿瘤细胞躲过抗肿瘤免疫,并加速其扩散。

这项研究于 9 月 18 日发表在《自然细胞生物学》(Nature Cell Biology,)上,未来它可能为癌症治疗指出一个新方向。

索尔克生物研究所的胡安·卡洛斯·伊斯皮苏亚·贝尔蒙特 (Juan Carlos Izpisua Belmonte) 教授说,“肿瘤细胞产生的时候,免疫压力也会出现,以抑制肿瘤细胞的扩散。然而,通过妨碍抗肿瘤免疫反应,癌细胞就能躲过抗肿瘤免疫。”肿瘤细胞分化的速度非常快,因而它们几乎能耗尽其周围所有的血液供养,这就会造成一种低氧环境,我们称之为缺氧(hypoxia)。在缺氧条件下,人体细胞会自我破坏,但是低氧肿瘤组织周围的微环境有时会保护肿瘤细胞。

贝尔蒙特教授说:“我们的研究指出了癌细胞如何在变化的微环境下进行反应,并通过固有的生物信号抑制抗肿瘤免疫。”

研究员在实验中对不同肿瘤细胞的提供了不同水平的微核糖核酸,发现 miR25 和 miR93 两种微核糖核酸的水平在低氧条件下有所增加。

在实验中,研究员降低了 148 名癌症病人的肿瘤细胞中 miR25 和 miR93 的水平,发现高水平的肿瘤细胞造成的病情恶化比低水平的严重得多。这与 cGAS 分子恰恰相反。肿瘤细胞中 cGAS 分子的水平越低,病人的病情就会越严重。

索尔克基因表达实验室的一位研究助理说:“基于这一结果,我们猜测,是不是 miR25 和 miR93 这两种微核糖核酸导致 cGAS 水平降低,从而为肿瘤细胞制造了一个反免疫的环境。”

原始出处:
Min Zu, Wu et al. miR-25/93 mediates hypoxia-induced immunosuppression by repressing cGAS. Nature Cell Biology. Sep 18, 2017.

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    2018-01-06 liye789132251
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    2017-10-01 维他命
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    2017-11-05 sunylz
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    2017-09-25 yxch36

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