Triggering mitotic catastrophe by podophyllotoxin induces apoptosis in oral squamous cell carcinoma

IF 2.1 4区 医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE
Su-Jung Choi , Ji-Hoon Kim , Hyun-Ji Kim , Dong-Guk Park , Bohwan Jin , Won Woo Lee , Kyoung-Ok Hong , Sak Lee , Thantrira Porntaveetus , Jae-Jin Cho , Seong-Doo Hong , Sung-Dae Cho
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引用次数: 0

Abstract

Objective

This study investigated the relationship between mitotic catastrophe (MC) and apoptosis in oral squamous cell carcinoma (OSCC) using podophyllotoxin (PPT), a natural compound with antimitotic properties.

Design

We evaluated the concentration-dependent effects of PPT on cell proliferation (CCK-8 and soft agar assays) and morphology (transmission electron microscopy). Mechanistic insights were obtained by assessing DNA damage (western blotting), cell cycle progression (sub-G1 analysis), and apoptosis-related protein activation in both 2D and 3D spheroid models of HSC-3 oral squamous carcinoma cells.

Results

PPT exerted pronounced inhibitory effects on cell proliferation and anchorage-independent growth accompanied by morphological indications of MC, such as enlarged multinucleated cells. DNA damage induced by PPT resulted in ataxia telangiectasia mutated kinase and checkpoint kinase 2 activation, leading to G2/M arrest and cyclin B1upregulation. Importantly, PPT-induced MC was followed by apoptosis, as evidenced by an increased sub-G1 population, Annexin V positivity, and caspase activation. Mitochondrial dysfunction, as indicated by altered membrane potential and enhanced Bax expression, underscored the apoptotic process. Caspase-2 activation emerged as a pivotal event, cleaving Bid and establishing a link between MC and the intrinsic apoptotic pathway. The effects were consistent across both 2D and 3D models, suggesting a robust therapeutic potential.

Conclusions

This study provides compelling evidence supporting the potential therapeutic significance of inducing MC-mediated apoptosis in OSCC. The results underscore the role of PPT and its derivatives, such as etoposide and teniposide, in targeting rapidly dividing cancer cells through interference with mitotic progression, offering insights into novel therapeutic strategies for oral cancer.
鬼臼毒素诱发有丝分裂突变诱导口腔鳞癌细胞凋亡。
目的:利用具有抗有丝分裂特性的天然化合物鬼臼毒素(PPT)研究口腔鳞状细胞癌(OSCC)有丝分裂突变(MC)与细胞凋亡的关系。设计:我们评估了PPT对细胞增殖(CCK-8和软琼脂测定)和形态(透射电镜)的浓度依赖性影响。通过评估HSC-3口腔鳞癌细胞的2D和3D球体模型中的DNA损伤(western blotting)、细胞周期进展(亚g1分析)和凋亡相关蛋白激活,获得了机制见解。结果:PPT对细胞增殖和非锚定生长有明显的抑制作用,并伴有多核细胞增大等形态学表现。PPT诱导的DNA损伤导致共济失调毛细血管扩张突变激酶和检查点激酶2活化,导致G2/M阻滞和细胞周期蛋白b1上调。重要的是,ppt诱导的MC随后是细胞凋亡,亚g1群增加、Annexin V阳性和caspase激活证明了这一点。线粒体功能障碍,如膜电位改变和Bax表达增强所示,强调了凋亡过程。Caspase-2的激活是一个关键事件,它切断了Bid,并在MC和内在凋亡途径之间建立了联系。这种效果在2D和3D模型中都是一致的,这表明它具有强大的治疗潜力。结论:本研究提供了令人信服的证据,支持诱导mc介导的细胞凋亡在OSCC中的潜在治疗意义。这些结果强调了PPT及其衍生物,如依托泊苷和天尼泊苷,在通过干扰有丝分裂进程靶向快速分裂的癌细胞中的作用,为口腔癌的新治疗策略提供了见解。
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
Archives of oral biology
Archives of oral biology 医学-牙科与口腔外科
CiteScore
5.10
自引率
3.30%
发文量
177
审稿时长
26 days
期刊介绍: Archives of Oral Biology is an international journal which aims to publish papers of the highest scientific quality in the oral and craniofacial sciences. The journal is particularly interested in research which advances knowledge in the mechanisms of craniofacial development and disease, including: Cell and molecular biology Molecular genetics Immunology Pathogenesis Cellular microbiology Embryology Syndromology Forensic dentistry
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