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Suberoylanilide hydroxamic acid sensitizes neuroblastoma to paclitaxel by inhibiting thioredoxin-related protein 14-mediated autophagy

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机构: [1]State Key Lab Oncol South China, Guangzhou, Guangdong, Peoples R China; [2]Sun Yat Sen Univ, Dept Pediat Oncol, Ctr Canc, 651 Dongfeng Rd East, Guangzhou 510060, Guangdong, Peoples R China; [3]Collaborat Innovat Ctr Canc Med, Guangzhou, Guangdong, Peoples R China; [4]Sun Yat Sen Univ, Zhongshan Sch Med, Guangzhou, Guangdong, Peoples R China; [5]Sun Yat Sen Univ, Dept Med Oncol, Ctr Canc, Guangzhou, Guangdong, Peoples R China
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关键词: Autophagy drug resistance inhibitor neuroblastoma paclitaxel

摘要:
Paclitaxel is not as effective for neuroblastoma as most of the front-line chemotherapeutics due to drug resistance. This study explored the regulatory mechanism of paclitaxel-associated autophagy and potential solutions to paclitaxel resistance in neuroblastoma. The formation of autophagic vesicles was detected by scanning transmission electron microscopy and flow cytometry. The autophagy-associated proteins were assessed by western blot. Autophagy was induced and the autophagy-associated proteins LC3-I, LC3-II, Beclin 1, and thioredoxin-related protein 14 (TRP14), were found to be upregulated in neuroblastoma cells that were exposed to paclitaxel. The inhibition of Beclin 1 or TRP14 by siRNA increased the sensitivity of the tumor cells to paclitaxel. In addition, Beclin 1-mediated autophagy was regulated by TRP14. Furthermore, the TRP14 inhibitor suberoylanilide hydroxamic acid (SAHA) downregulated paclitaxel-induced autophagy and enhanced the anticancer effects of paclitaxel in normal control cancer cells but not in cells with upregulated Beclin 1 and TRP14 expression. Our findings showed that paclitaxel-induced autophagy in neuroblastoma cells was regulated by TRP14 and that SAHA could sensitize neuroblastoma cells to paclitaxel by specifically inhibiting TRP14.

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出版当年[2017]版:
大类 | 2 区 医学
小类 | 3 区 肿瘤学
最新[2023]版:
大类 | 2 区 医学
小类 | 2 区 肿瘤学
第一作者:
第一作者机构: [1]State Key Lab Oncol South China, Guangzhou, Guangdong, Peoples R China; [2]Sun Yat Sen Univ, Dept Pediat Oncol, Ctr Canc, 651 Dongfeng Rd East, Guangzhou 510060, Guangdong, Peoples R China; [3]Collaborat Innovat Ctr Canc Med, Guangzhou, Guangdong, Peoples R China;
通讯作者:
通讯机构: [1]State Key Lab Oncol South China, Guangzhou, Guangdong, Peoples R China; [2]Sun Yat Sen Univ, Dept Pediat Oncol, Ctr Canc, 651 Dongfeng Rd East, Guangzhou 510060, Guangdong, Peoples R China; [3]Collaborat Innovat Ctr Canc Med, Guangzhou, Guangdong, Peoples R China;
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