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Silencing E3 Ubiqutin ligase ITCH as a potential therapy to enhance chemotherapy efficacy in p53 mutant neuroblastoma cells.
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-23 , DOI: 10.1038/s41598-020-57854-6
Jinhong Meng 1, 2 , Aristides D Tagalakis 2, 3 , Stephen L Hart 2
Affiliation  

P53 mutations are responsible for drug-resistance of tumour cells which impacts on the efficacy of treatment. Alternative tumour suppressor pathways need to be explored to treat p53- deficient tumours. The E3 ubiquitin ligase, ITCH, negatively regulates the tumour suppressor protein TP73, providing a therapeutic target to enhance the sensitivity of the tumour cells to the treatment. In the present study, two p53-mutant neuroblastoma cell lines were used as in vitro models. Using immunostaining, western blot and qPCR methods, we firstly identified that ITCH was expressed on p53-mutant neuroblastoma cell lines. Transfection of these cell lines with ITCH siRNA could effectively silence the ITCH expression, and result in the stabilization of TP73 protein, which mediated the apoptosis of the neuroblastoma cells upon irradiation treatment. Finally, in vivo delivery of the ITCH siRNA using nanoparticles to the neuroblastoma xenograft mouse model showed around 15-20% ITCH silencing 48 hours after transfection. Our data suggest that ITCH could be silenced both in vitro and in vivo using nanoparticles, and silencing of ITCH sensitizes the tumour cells to irradiation treatment. This strategy could be further explored to combine the chemotherapy/radiotherapy treatment to enhance the therapeutic effects on p53-deficient neuroblastoma.

中文翻译:


沉默 E3 泛素连接酶 ITCH 作为增强 p53 突变神经母细胞瘤细胞化疗疗效的潜在疗法。



P53突变导致肿瘤细胞产生耐药性,从而影响治疗效果。需要探索替代的肿瘤抑制途径来治疗 p53 缺陷的肿瘤。 E3 泛素连接酶 ITCH 负向调节肿瘤抑制蛋白 TP73,提供治疗靶点以增强肿瘤细胞对治疗的敏感性。在本研究中,使用两种p53突变型神经母细胞瘤细胞系作为体外模型。使用免疫染色、蛋白质印迹和 qPCR 方法,我们首先鉴定了 ITCH 在 p53 突变神经母细胞瘤细胞系中表达。用ITCH siRNA转染这些细胞系可以有效沉默ITCH表达,并导致TP73蛋白稳定,从而介导放射治疗后神经母细胞瘤细胞的凋亡。最后,使用纳米粒子将 ITCH siRNA 体内递送至神经母细胞瘤异种移植小鼠模型,转染 48 小时后显示约 15-20% 的 ITCH 沉默。我们的数据表明,使用纳米颗粒可以在体外和体内沉默 ITCH,并且 ITCH 的沉默使肿瘤细胞对放射治疗敏感。可以进一步探索这一策略,将化疗/放疗结合起来,以增强对p53缺陷型神经母细胞瘤的治疗效果。
更新日期:2020-01-23
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