Natural lignan justicidin A-induced mitophagy as a targetable niche in bladder cancer

IF 5.4 2区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Kai-Hsun Chang , Hsin-Chih Chen , Ching-Ying Chen , Shu-Ping Tsai , Man-Yuan Hsu , Pao-Yuan Wang , Shan-Ying Wu , Chun-Li Su
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Abstract

Accumulated dysfunctional mitochondria are involved in tumorigenesis, and it is conceivable that mitophagy, a selective form of autophagic degradation of mitochondria, plays a tumor-suppressive role. Our bioinformatics analysis identified lignan justicidin A (JA) as a potential mitophagy inducer. In HRAS-mutant human bladder cancer T24 cells, JA reduced population cell growth, changed mitochondrial membrane potential, and induced autophagy. JA-induced mitophagy was demonstrated by a reduction of mitochondrial puncta by confocal microscopy and co-localization of autophagy marker LC3 and mitochondrial matrix protein HSP60 in the autophagic vesicles by electron microscopy. These phenomena were associated with altered mitochondrial dynamics, increased expressions of HIF-1α and its target gene BNIP3, and induced co-immunoprecipitation of LC3 with BNIP3 homo-dimer. Confocal microscopy further observed co-localizations among puncta of LC3, BNIP3, and HSP60. JA raised BNIP3 expression in T24 but not E7 (HRAS wild-type) and induced stronger autophagy in T24 than in E7 cells, indicating JA preferentially caused BNIP3-mediated mitophagy in urinary tract cells with oncogenic HRAS. Furthermore, JA enhanced cytotoxicity of T24 cells to anti-cancer drugs cisplatin combined with gemcitabine. Analyses of patients’ data further showed that, in contrast to other major cancer types, lowered mitophagy in bladder urothelial carcinoma compared with normal tissues and reduced expression of mitochondrial genes in cisplatin-responsive bladder cancer cells compared with non-responsive cells suggest mitophagy acts as a tumor suppressor to avoid cisplatin resistance in bladder cancer. Overall, our data suggest the role of BNIP3 and mitophagy in anti-cancer mechanism of human bladder cancer with HRAS mutation in response to JA.
天然木脂素justicidin a在膀胱癌中诱导线粒体自噬的作用。
积累的功能失调的线粒体参与了肿瘤的发生,可以想象,线粒体自噬是线粒体自噬降解的一种选择性形式,起着抑制肿瘤的作用。我们的生物信息学分析发现木脂素正义素A (JA)是一种潜在的有丝分裂诱导剂。在hras突变的人膀胱癌T24细胞中,JA降低了群体细胞的生长,改变了线粒体膜电位,诱导了自噬。共聚焦显微镜观察到线粒体小点减少,电镜观察到自噬标记物LC3和线粒体基质蛋白HSP60在自噬小泡中共定位,证实了ja诱导的线粒体自噬。这些现象与线粒体动力学改变、HIF-1α及其靶基因BNIP3表达增加、LC3与BNIP3同源二聚体共免疫沉淀有关。共聚焦显微镜进一步观察到LC3、BNIP3和HSP60的点间共定位。JA提高了BNIP3在T24细胞中的表达,而没有提高E7细胞(HRAS野生型)的表达,诱导T24细胞的自噬强于E7细胞,说明JA优先引起BNIP3介导的HRAS尿路细胞的有丝分裂。此外,JA增强了T24细胞对抗癌药物顺铂联合吉西他滨的细胞毒性。对患者数据的分析进一步表明,与其他主要癌症类型相比,膀胱尿路上皮癌的线粒体自噬较正常组织降低,顺铂反应性膀胱癌细胞的线粒体基因表达较非顺铂反应性膀胱癌细胞降低,表明线粒体自噬可作为肿瘤抑制因子避免膀胱癌的顺铂耐药。总之,我们的数据表明BNIP3和线粒体自噬在人膀胱癌HRAS突变对JA的抗癌机制中起作用。
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来源期刊
CiteScore
7.70
自引率
3.90%
发文量
410
审稿时长
36 days
期刊介绍: Chemico-Biological Interactions publishes research reports and review articles that examine the molecular, cellular, and/or biochemical basis of toxicologically relevant outcomes. Special emphasis is placed on toxicological mechanisms associated with interactions between chemicals and biological systems. Outcomes may include all traditional endpoints caused by synthetic or naturally occurring chemicals, both in vivo and in vitro. Endpoints of interest include, but are not limited to carcinogenesis, mutagenesis, respiratory toxicology, neurotoxicology, reproductive and developmental toxicology, and immunotoxicology.
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