TGF-β receptor inhibitor LY2109761 enhances the radiosensitivity of gastric cancer by inactivating the TGF-β/SMAD4 signaling pathway

TGF-β receptor inhibitor LY2109761 enhances the radiosensitivity of gastric cancer by inactivating the TGF-β/SMAD4 signaling pathway
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TGF-β受体抑制剂LY2109761通过灭活TGF-β/SMAD4信号通路增强胃癌的放射敏感性

DOI:
10.18632/aging.102329
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发表时间:
2019-10
期刊:
影响因子:
5.2
通讯作者:
Yongchang Wei
Yongchang Wei
中科院分区:
医学2区
文献类型:
--
作者:
Tian Yang;Tianhe Huang;Dongdong Zhang;Miao Wang;Balu Wu;Yufeng Shang;Safat Sattar;Lu Ding;Yin Liu;Hongqiang Jiang;Yuxing Liang;Fuling Zhou;Yongchang Wei

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放射疗法用于治疗胃癌(GC);然而,放射抵抗挑战了GC的临床结果,并且GC放射抵抗的机制仍然知之甚少。在此,我们报道 TGF-β 受体抑制剂 LY2109761 (LY) 在体外和体内都是一种潜在的放射增敏剂。根据癌症基因组图谱数据库,TGF-β 过度表达与 GC 患者总体生存率较差显着相关。我们证明了 TGF β/SMAD4 信号通路在放射抗性 GC 细胞和放射抗性 GC 患者中均被激活。作为 TGF-β 受体抑制剂,LY 可通过抑制细胞增殖、降低克隆形成和增加细胞凋亡来增强辐射活性。此外,LY减弱了放射诱导的GC细胞的迁移和侵袭、上皮间质转化(EMT)、炎症因子激活、免疫抑制和癌干细胞特征,从而导致GC细胞的放射增敏。我们在肿瘤异种移植模型中证实,LY 可减少肿瘤生长,抑制 TGF-β/SMAD4 通路激活并逆转辐射诱导的 EMT。我们的研究结果表明,新型 TGF-β 受体抑制剂 LY 通过直接调节 TGF-β/SMAD4 信号通路来增加 GC 放射敏感性。这些发现为胃癌患者的放射治疗提供了新的见解。
Radiotherapy is used to treat gastric cancer (GC); however, radioresistance challenges the clinical outcomes of GC, and the mechanisms of radioresistance in GC remain poorly understood. Here, we report that the TGF-β receptor inhibitor, LY2109761 (LY), is a potential radiosensitizer both in vitro and in vivo. As per the Cancer Genome Atlas database, TGF-β overexpression issignificantly related to poor overallsurvival in GC patients. We demonstrated that the TGF β/SMAD4 signaling pathway was activated in both radioresistant GC cells and radioresistant GC patients. As a TGF-β receptor inhibitor, LY can enhance the activities of irradiation by inhibiting cell proliferation, decreasing clonogenicity and increasing apoptosis. Moreover, LY attenuated the radiation-induced migration and invasion, epithelial-mesenchymal transition (EMT), inflammatory factor activation, immunosuppression, and cancerstem cell characteristics of GC cells, thus leading to radiosensitization of the GC cells. We confirmed that LY reduced tumor growth, inhibited TGF-β/SMAD4 pathway activation and reversed irradiation-induced EMT in a tumor xenograft model. Our findings indicate that the novel TGF-β receptor inhibitor, LY, increases GC radiosensitivity by directly regulating the TGF-β/SMAD4 signaling pathway. These findings provide new insight for radiotherapy in GC patients.
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