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Cell reports:靶向AMPK治疗白血病

2015-05-28 佚名 生物谷

本文亮点:   激活AMPK能够阻断急性髓系白血病传播但不会损伤正常造血功能   AMPK激活剂(GSK621)诱导的细胞毒性包括急性髓系白血病的自噬过程   共激活AMPK和mTORC1能够协同抑制AML   AMPK和mTORC1的交互作用需要eIF2a/ATF4信号途径的参与   近日,来自法国的科学家在国际学术期刊

本文亮点:
 
激活AMPK能够阻断急性髓系白血病传播但不会损伤正常造血功能
 
AMPK激活剂(GSK621)诱导的细胞毒性包括急性髓系白血病的自噬过程
 
共激活AMPK和mTORC1能够协同抑制AML
 
AMPK和mTORC1的交互作用需要eIF2a/ATF4信号途径的参与
 

近日,来自法国的科学家在国际学术期刊cell reports在线发表了一项最新研究进展,他们发现通过小分子药物激活AMPK能够特异性杀死急性髓系白血病细胞,对于该病治疗药物开发具有重要意义。
 
急性髓细胞性白血病(Acute myeloid leukemia,AML)是髓系造血干/祖细胞恶性疾病,具有贫血、出血、感染和发热、脏器浸润、代谢异常等临床表现,多数病例病情急重,预后凶险,如不及时治疗常可危及生命。目前,传统的化疗方法只对一小部分病人起作用,化疗方法造成的毒副作用大大限制了其在老年病人和患有并发症的病人中的应用。
 
AMPK是细胞代谢的一个主要调控因子,在不同细胞环境下可表现出促癌和抑癌两种不同的活性。在该项研究中,研究人员发现AMPK特异性激动剂GSK621能够选择性杀伤急性髓系白血病细胞,但不会对正常的造血祖细胞产生毒性。GSK621能够直接并特异性激活AMPK,通过激活不依赖mTORC1的自噬过程诱导细胞毒性作用。同时,研究人员还发现AMPK的激活和mTORC1信号途径的组成型激活在一系列AML原代样品和细胞系中发生致死性相互作用,而在正常造血祖细胞中缺少组成型激活的mTORC1,因此单独的AMPK激活并不会对正常细胞产生毒性作用。
 
除此之外,研究人员还对其中的分子机制进行了进一步探讨,他们发现eIF2a/ATF4信号途径对于AMPK和mTORC1激活产生的致死性作用非常重要。
 
总的来说,这项研究发现通过AMPK特异性激动剂GSK621激活AMPK能够特异性杀死AML细胞,这种毒性作用是通过AMPK与AML细胞中组成型激活的mTORC1发生相互作用而实现的,这对于开发AML治疗药物,避免影响正常造血祖细胞功能具有重要意义。

原始出处:

Pierre Sujobert, Laury Poulain, Etienne Paubelle et al.Co-activation of AMPK and mTORC1 Induce Cytotoxicity in Acute Myeloid Leukemia.Cell Reports, May 21, 2015.DOI: http://dx.doi.org/10.1016/j.celrep.2015.04.063
 

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    2016-02-29 维他命
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    2015-05-31 huaxipanxing

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