ORP4L is essential for T-cell acute lymphoblastic leukemia cell survival.

ORP4L is essential for T-cell acute lymphoblastic leukemia cell survival.
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ORP4L 对于 T 细胞急性淋巴细胞白血病细胞的存活至关重要

DOI:
10.1038/ncomms12702
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发表时间:
2016-09-01
影响因子:
16.6
通讯作者:
Yan, Daoguang
Yan, Daoguang
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhong, Wenbin;Yi, Qing;Xu, Bing;Li, Shiqian;Wang, Tong;Liu, Fupei;Zhu, Biying;Hoffmann, Peter R.;Ji, Guangju;Lei, Pingsheng;Li, Guoping;Li, Jiwei;Li, Jian;Olkkonen, Vesa M.;Yan, Daoguang

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癌症中的代谢途径被重新编程以支持细胞存活。在这里,我们报告说,T细胞急性淋巴细胞白血病(T-ALL)细胞的特点是增加氧化磷酸化和强大的ATP生产。我们证明ORP 4L在T-ALL中表达,但在正常T细胞中不表达,并且其丰度与细胞ATP成比例。ORP 4L作为衔接子/支架将CD 3 β、Gαq/11和PLCβ3组装成激活PLCβ3的复合物。与正常T细胞中的PLCγ1不同,PLCβ3在T-ALL中催化IP 3的产生。因此,ORP 4L的上调导致负责IP 3诱导的内质网Ca 2+释放和氧化磷酸化的酶的转换。ORP 4L敲低导致体内次优的生物能量学、细胞死亡和T-ALL移植的废除。总之,我们发现了一条在T-ALL细胞中特异性发挥作用的信号通路,其中ORP 4L介导G蛋白偶联配体诱导的PLCβ3激活,导致线粒体呼吸增加,从而促进细胞存活。靶向ORP 4L可能是T-ALL治疗的一种有前途的方法。
Metabolic pathways are reprogrammed in cancer to support cell survival. Here, we report that T-cell acute lymphoblastic leukemia (T-ALL) cells are characterized by increased oxidative phosphorylation and robust ATP production. We demonstrate that ORP4L is expressed in T-ALL but not normal T-cells and its abundance is proportional to cellular ATP. ORP4L acts as an adaptor/scaffold assembling CD3ɛ, Gαq/11and PLCβ3 into a complex that activates PLCβ3. PLCβ3 catalyzes IP3production in T-ALL as opposed to PLCγ1 in normal T-cells. Up-regulation of ORP4L thus results in a switch in the enzyme responsible for IP3-induced endoplasmic reticulum Ca2+release and oxidative phosphorylation. ORP4L knockdown results in suboptimal bioenergetics, cell death and abrogation of T-ALL engraftmentin vivo. In summary, we uncovered a signalling pathway operating specifically in T-ALL cells in which ORP4L mediates G protein-coupled ligand-induced PLCβ3 activation, resulting in an increase of mitochondrial respiration for cell survival. Targeting ORP4L might represent a promising approach for T-ALL treatment.
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