Inhibition of protein phosphatase 2A with a small molecule LB100 radiosensitizes nasopharyngeal carcinoma xenografts by inducing mitotic catastrophe and blocking DNA damage repair.

Inhibition of protein phosphatase 2A with a small molecule LB100 radiosensitizes nasopharyngeal carcinoma xenografts by inducing mitotic catastrophe and blocking DNA damage repair.
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用小分子 LB100 抑制蛋白磷酸酶 2A,通过诱导有丝分裂灾难和阻断 DNA 损伤修复,使鼻咽癌异种移植物放射增敏。

DOI:
10.18632/oncotarget.2258
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发表时间:
2014-09-15
期刊:
影响因子:
--
通讯作者:
Zeng YX
Zeng YX
中科院分区:
其他
文献类型:
--
作者:
Lv P;Wang Y;Ma J;Wang Z;Li JL;Hong CS;Zhuang Z;Zeng YX

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鼻咽癌(NPC)虽然在世界范围内并不常见,但在中国却是一个主要的健康问题。虽然局部放疗和手术可以很好地控制鼻咽癌,但需要更好的治疗方法来减少放疗剂量。蛋白磷酸酶2A (PP2A)是一种普遍存在的多功能酶,在细胞周期调节和dna损伤反应中起关键作用,据报道,抑制PP2A可使癌细胞对放疗和化疗敏感。我们研究了目前处于I期临床试验的小分子LB100对两种人鼻咽细胞系(CNE1,据报道具有放射抗性)和CNE2的PP2A抑制作用。在这两种细胞系中,LB100暴露增加了细胞内p-Plk1、TCTP和Cdk1,并降低了p53,这些变化与细胞周期阻滞、有丝分裂突变和细胞增殖的放射性抑制有关。两种细胞系皮下移植的小鼠每天给予1.5 mg/kg LB100,连续3天,并给予单剂量20 Gy辐射(第3天),肿瘤肿块明显且持续消退(CNE1和CNE2的剂量增强因子分别为2.98和2.27)。LB100治疗或单独放疗仅能短暂抑制异种移植物生长。我们的结果支持进一步探索PP2A抑制作为鼻咽癌和其他潜在实体瘤放疗方案的一部分。
Nasopharyngeal carcinoma (NPC), while uncommon worldwide, is a major health problem in China. Although local radiation and surgery provide good control of NPC, better treatments that permit reductions in radiation dosing are needed. Inhibition of protein phosphatase 2A (PP2A), a ubiquitous multifunctional enzyme with critical roles in cell cycle regulation and DNA-damage response, reportedly sensitizes cancer cells to radiation and chemotherapy. We studied PP2A inhibition with LB100, a small molecule currently in a Phase I clinical trial, on radiosensitization of two human nasopharyngeal cell lines: CNE1, which is reportedly radioresistant, and CNE2. In both cell lines, LB100 exposure increased intracellular p-Plk1, TCTP, and Cdk1 and decreased p53, changes associated with cell cycle arrest, mitotic catastrophe and radio-inhibition of cell proliferation. Mice bearing subcutaneous xenografts of either cell line were administered 1.5 mg/kg LB100 daily for three days and a single dose of 20 Gy radiation (day 3), which produced marked and prolonged tumor mass regression (dose enhancement factors of 2.98 and 2.27 for CNE1 and CNE2 xenografts, respectively). Treatment with either LB100 or radiation alone only transiently inhibited xenograft growth. Our results support further exploration of PP2A inhibition as part of radiotherapy regimens for NPC and potentially other solid tumors.
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