PIM2-mediated phosphorylation of hexokinase 2 is critical for tumor growth and paclitaxel resistance in breast cancer.

PIM2-mediated phosphorylation of hexokinase 2 is critical for tumor growth and paclitaxel resistance in breast cancer.
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PIM2 介导的己糖激酶 2 磷酸化对于乳腺癌的肿瘤生长和紫杉醇耐药性至关重要

DOI:
10.1038/s41388-018-0386-x
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发表时间:
2018-11
期刊:
影响因子:
8
通讯作者:
Yu Z
Yu Z
中科院分区:
医学1区
文献类型:
--
作者:
Yang T;Ren C;Qiao P;Han X;Wang L;Lv S;Sun Y;Liu Z;Du Y;Yu Z

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己糖激酶II(HK 2)是参与糖酵解的关键酶,是乳腺癌进展所必需的。然而,HK 2活性的潜在翻译后机制知之甚少。在这里,我们表明,小鼠淋巴瘤2(PIM 2)中的前病毒插入直接结合到HK 2和Thr 473上的磷酸化HK 2。生化分析表明,磷酸化的HK 2 Thr 473通过分子伴侣介导的自噬(CMA)途径促进其蛋白稳定性,并且PIM 2和pThr 473-HK 2蛋白在人乳腺癌中的表达水平呈正相关。此外,在Thr 473上的HK 2磷酸化增加HK 2酶活性和糖酵解,并增强葡萄糖饥饿诱导的自噬。因此,磷酸化的HK 2 Thr 473在体外和体内促进乳腺癌细胞生长。有趣的是,PIM 2激酶抑制剂SMI-4a可以在体外和体内消除磷酸化HK 2 Thr 473对紫杉醇耐药性的影响。总之,我们的研究结果表明,PIM 2是一种新的调节HK 2,并提出了一种新的策略来治疗乳腺癌。
Hexokinase-II (HK2) is a key enzyme involved in glycolysis, which is required for breast cancer progression. However, the underlying post-translational mechanisms of HK2 activity are poorly understood. Here, we showed that Proviral Insertion in Murine Lymphomas 2 (PIM2) directly bound to HK2 and phosphorylated HK2 on Thr473. Biochemical analyses demonstrated that phosphorylated HK2 Thr473 promoted its protein stability through the chaperone-mediated autophagy (CMA) pathway, and the levels of PIM2 and pThr473-HK2 proteins were positively correlated with each other in human breast cancer. Furthermore, phosphorylation of HK2 on Thr473 increased HK2 enzyme activity and glycolysis, and enhanced glucose starvation-induced autophagy. As a result, phosphorylated HK2 Thr473 promoted breast cancer cell growth in vitro and in vivo. Interestingly, PIM2 kinase inhibitor SMI-4a could abrogate the effects of phosphorylated HK2 Thr473 on paclitaxel resistance in vitro and in vivo. Taken together, our findings indicated that PIM2 was a novel regulator of HK2, and suggested a new strategy to treat breast cancer.
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发表时间: 2018-05
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影响因子: 6.6
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