Cancer Cell:天冬酰胺合成酶有望成为治疗KAS突变的NSCLC的靶点

2018-01-19 MedSci MedSci原创

科学家发现如果抑制AKT抑制的ASNS 表达,并且同时去除细胞外的天冬酰胺,可以降低肿瘤的生长。因此,KRAS在细胞营养缺乏时的应激反应中十分重要,并且ASNS是KRAS突变的非小细胞肺癌的极具希望的治疗靶点。

在非小细胞肺癌(non-small-cell lung cancer,NSCLC)中KRAS突变率将近30%。深入研究KRAS如何驱动肺癌病理发生,以及靶向寻找致病过程中的漏洞是癌症研究中优先考虑的问题。而癌症细胞在生长过程中需要大分子营养物质,包括氨基酸,核酸和脂肪酸。但是由于肿瘤没有足够的血管供养,因此肿瘤细胞长期处于营养耗竭的状态,但是它们是如何在营养耗竭的状态下生存呢?

之前的研究表明KRSA是非小细胞肺癌的营养应激反应调节器。在胰腺癌中,KARS能通过GOT1改变谷氨酸的代谢从而提升NADPH的产量,并且通过上调吞饮作用增加营养物质的摄取。而研究者在NSCLC中发现KRAS通过其下游的AKT和NRF2诱导激活ATF4信号通路,从而应对营养耗竭。

肿瘤抑制因子KEAP1能强烈的影响激活ATF4的结局,并且在KRAS突变的细胞中丢失KEAP1会导致细胞凋亡。通过ATF4调节,KRAS改变氨基酸的摄取和天冬酰胺的生物合成。ATF4靶向天冬酰胺合成酶,参与凋亡抑制,蛋白质生物合成,和mTORC1的激活。科学家发现如果抑制AKT抑制的ASNS 表达,并且同时去除细胞外的天冬酰胺,可以降低肿瘤的生长。因此,KRAS在细胞营养缺乏时的应激反应中十分重要,并且ASNS是KRAS突变的非小细胞肺癌的极具希望的治疗靶点。

文章出处Gwinn D M, Lee A G, Briones-Martin-del-Campo M, et al. Oncogenic KRAS Regulates Amino Acid Homeostasis and Asparagine Biosynthesis via ATF4 and Alters Sensitivity to L-Asparaginase[J]. Cancer Cell, 2018, 33(1): 91-107. e6.DOI: 10.1016/j.ccell.2017.12.003

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    2018-06-01 维他命
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    2018-01-19 1ddf0692m34(暂无匿称)

    学习了.好文章

    0

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    2018-01-19 131****1460

    学习了受益匪浅

    0

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    2018-01-19 happsf

    学习

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