Denticleless homolog-mediated ubiquitin-proteasome degradation of forkhead box O1 contributes to development of carboplatin resistance in retinoblastoma.

IF 2.2 4区 医学 Q3 ONCOLOGY
Anti-Cancer Drugs Pub Date : 2025-09-01 Epub Date: 2025-06-03 DOI:10.1097/CAD.0000000000001738
Xian Liu, Shou-Feng Jiao, Chun-Yi Liu, Rui Luo, Han Liu, Yong Chai
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引用次数: 0

Abstract

This study aimed to investigate the role of forkhead box O1 (FOXO1) in carboplatin-resistant retinoblastoma (RB) cells, focusing on its subcellular distribution and regulation through ubiquitin-dependent degradation mediated by denticleless homolog (DTL). The study sought to elucidate the molecular mechanisms underlying carboplatin resistance in RB and explore potential therapeutic strategies to overcome chemoresistance. Carboplatin-resistant RB cell lines (Y79/CBP and WERI-Rb-1/CBP) were established by incremental drug exposure. Bioinformatics analysis of the GSE111168 dataset identified differentially expressed genes associated with ubiquitination pathways. DTL expression was modulated using adeno-associated virus-mediated knockdown and overexpression. FOXO1 protein levels, subcellular localization, and ubiquitination were assessed via western blotting, immunofluorescence, and coimmunoprecipitation (Co-IP). The effects of DTL knockdown and LOM612 treatment on cell proliferation, apoptosis, and tumor growth were evaluated in vitro and in vivo using xenograft models. FOXO1 expression and nuclear localization were significantly reduced in carboplatin-resistant RB cells, with elevated levels of FOXO1 ubiquitination. Proteasome inhibitors preserved FOXO1 protein levels, implicating the ubiquitin-proteasome system in its degradation. DTL was identified as a significantly overexpressed gene in both resistant cells and patient-derived samples. Silencing DTL increased FOXO1 protein expression and nuclear accumulation, while Co-IP confirmed the interaction between DTL and FOXO1, mediated by the WD40 domain of DTL. Combined DTL knockdown and LOM612 treatment synergistically inhibited cell proliferation and invasion, promoted apoptosis in vitro, and significantly reduced tumor growth and induced apoptosis in vivo. DTL-mediated ubiquitination and degradation of FOXO1 play a critical role in carboplatin resistance in RB. Dual targeting of DTL and FOXO1 nuclear translocation may represent a promising therapeutic strategy to overcome chemoresistance and improve clinical outcomes in RB.

无齿同源介导的叉头盒O1泛素蛋白酶体降解有助于视网膜母细胞瘤中卡铂耐药的发展。
本研究旨在探讨叉头盒O1 (FOXO1)在卡铂耐药视网膜母细胞瘤(RB)细胞中的作用,重点研究其亚细胞分布及其通过无牙同源物(DTL)介导的泛素依赖性降解的调控。该研究旨在阐明RB中卡铂耐药的分子机制,并探索克服化疗耐药的潜在治疗策略。通过增加药物暴露,建立了卡铂耐药RB细胞系Y79/CBP和WERI-Rb-1/CBP。GSE111168数据集的生物信息学分析鉴定了与泛素化途径相关的差异表达基因。通过腺相关病毒介导的敲低和过表达来调节DTL的表达。通过免疫印迹、免疫荧光和共免疫沉淀(Co-IP)评估fox01蛋白水平、亚细胞定位和泛素化。在体外和体内利用异种移植模型评估DTL敲除和LOM612处理对细胞增殖、凋亡和肿瘤生长的影响。在卡铂耐药RB细胞中,FOXO1的表达和核定位显著降低,FOXO1泛素化水平升高。蛋白酶体抑制剂保留fox01蛋白水平,暗示泛素-蛋白酶体系统参与其降解。在耐药细胞和患者来源的样本中,DTL被鉴定为一个显著过表达的基因。沉默DTL增加了FOXO1蛋白的表达和核积累,而Co-IP证实了DTL与FOXO1之间的相互作用,这是由DTL的WD40结构域介导的。DTL敲低和LOM612联合处理在体外协同抑制细胞增殖和侵袭,促进细胞凋亡,在体内显著降低肿瘤生长,诱导细胞凋亡。dtl介导的泛素化和FOXO1的降解在RB的卡铂耐药中起关键作用。DTL和FOXO1核易位的双重靶向可能是克服化疗耐药和改善RB临床结果的一种有希望的治疗策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Anti-Cancer Drugs
Anti-Cancer Drugs 医学-药学
CiteScore
3.80
自引率
0.00%
发文量
244
审稿时长
3 months
期刊介绍: Anti-Cancer Drugs reports both clinical and experimental results related to anti-cancer drugs, and welcomes contributions on anti-cancer drug design, drug delivery, pharmacology, hormonal and biological modalities and chemotherapy evaluation. An internationally refereed journal devoted to the fast publication of innovative investigations on therapeutic agents against cancer, Anti-Cancer Drugs aims to stimulate and report research on both toxic and non-toxic anti-cancer agents. Consequently, the scope on the journal will cover both conventional cytotoxic chemotherapy and hormonal or biological response modalities such as interleukins and immunotherapy. Submitted articles undergo a preliminary review by the editor. Some articles may be returned to authors without further consideration. Those being considered for publication will undergo further assessment and peer-review by the editors and those invited to do so from a reviewer pool.
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