Role of mTORC1-S6K1 signaling pathway in regulation of hematopoietic stem cell and acute myeloid leukemia.

Role of mTORC1-S6K1 signaling pathway in regulation of hematopoietic stem cell and acute myeloid leukemia.
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MTORC1-S6K1信号通路在调节造血干细胞和急性髓样白血病中的作用。

DOI:
10.1016/j.exphem.2017.02.004
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发表时间:
2017-06
影响因子:
2.6
通讯作者:
Kapur R
Kapur R
中科院分区:
医学4区
文献类型:
--
作者:
Ghosh J;Kapur R

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雷帕霉素复合物1 (mTORC1)-p70核糖体蛋白激酶1 (S6K1)信号通路机制靶点的失调在急性髓性白血病(AML)患者中经常发生。这一途径在维持正常的细胞过程中也起着关键作用。鉴于白血病干细胞(LSC)在微小残留病(MRD)发展中的重要性,使用针对LSC人群的治疗干预措施来预防疾病复发至关重要。mTORC1-S6K1通路已被确定为造血干细胞(HSC)和LSC功能的重要调节因子。HSC和LSC的功能都需要调节增殖、代谢和自噬等关键细胞过程,这些过程都是由mTORC1通路调节的。尽管mTORC1-S6K1途径是AML发生和进展的关键调节因子,但在临床研究中,单独使用该途径的抑制剂产生了不同的结果。最近的研究已经确定了开发新的mTORC1-S6K1抑制剂的策略,如RapaLink-1,可以绕过AML细胞和LSC中观察到的耐药。在本文中,我们回顾了最近在确定该途径的不同成分在HSC和LSC调控中的作用以及可能的治疗方法方面取得的进展。
Dysregulation of the mechanistic target of rapamycin complex 1 (mTORC1)-p70 ribosomal protein kinase 1 (S6K1) signaling pathway occurs frequently in acute myeloid leukemia (AML) patients. This pathway also plays a critical role in maintaining normal cellular processes. Given the importance of leukemia stem cells (LSC) in the development of minimal residual disease (MRD), it is critical to use therapeutic interventions that target LSC population to prevent disease relapse. mTORC1-S6K1 pathway has been identified as an important regulator of hematopoietic stem cell (HSC) and LSC functions. Both HSC and LSC functions require regulation of key cellular processes including proliferation, metabolism and autophagy, which are regulated by mTORC1 pathway. Despite mTORC1-S6K1 pathway being a critical regulator of AML initiation and progression, inhibitors of this pathway alone have yielded mixed results in clinical studies. Recent studies have identified strategies to develop new mTORC1-S6K1 inhibitors like RapaLink-1, which could circumvent the drug resistance observed in AML cells as well as in LSC. In this article, we review recent advances made in identifying the role of different components of this pathway in the regulation of HSC and LSC along with possible therapeutic approaches.
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