Br J Cancer:上皮-间充质转换影响口腔鳞状细胞癌的放疗抗性和细胞侵袭

2021-04-01 xiaozeng MedSci原创

肿瘤内异质性或肿瘤内不同功能亚群的存在是肿瘤预后和对治疗响应的主要混杂因素。既往研究也显示出了在肿瘤独特性进展和治疗后重塑中,从基因组成到表型变异的肿瘤异质性。

肿瘤内异质性或肿瘤内不同功能亚群的存在是肿瘤预后和对治疗响应的主要混杂因素。既往研究也显示出了在肿瘤独特性进展和治疗后重塑中,从基因组成到表型变异的肿瘤异质性。在肿瘤发生,转移和治疗耐药性中,上皮-间充质的动态转化起着至关重要的作用。

口腔鳞状细胞癌(OSCC)作为一种最常见的口腔癌类型,占所有确诊病例的近95%。该疾病通常通过外科手术切除肿瘤块,并进行辅助放疗和/或化疗的策略进行治疗。然而,局部复发和转移性复发以及放疗抗性的发生也导致了OSCC患者的生存率低至57%。

在该研究中,研究人员采用OSCC作为模型,通过各种细胞生物学和转录组学分析,研究OSCC对放疗响应的细胞和分子动力学。


结果显示,OSCC细胞和肿瘤样本中存在着明显的上皮-间质混合状态。研究人员进一步的确定了E-cadherin(E-钙粘蛋白)的水平在将混合细胞分层到不同水平的放疗反应和放疗诱导的上皮-间质转化过程中的关键作用。

OSCC细胞和肿瘤球的局部EMT状态

对于放疗的反应还需要产生一个新的细胞群(ECADLow/Neg-VIMPos),该细胞群中E-cadherin的表达水平较低,而波形蛋白Vimentin呈阳性,其作为一种表型特征,显示出了增强的放疗抗性和侵袭能力。


转录组学分析肿瘤球对放疗的响应发现,在最初的30分钟内出现了一系列的调控失调。细胞信号通路分析显示,Wnt信号通路的过表达在放疗抗性和肿瘤细胞侵袭作用上起着至关重要的作用,进一步的研究证实其参与了ECADLow/Neg-VIMPos细胞群的产生。

放疗后ECADLow/Neg-VIMPos细胞群的产生

总而言之,该研究结果强调了肿瘤细胞重塑对于放射性疗法响应的功能意义和复杂性,其与耐药性的产生和肿瘤细胞的侵袭能力相关。


原始出处:

Zolghadr, F., Tse, N., Loka, D. et al. A Wnt-mediated phenotype switch along the epithelial–mesenchymal axis defines resistance and invasion downstream of ionising radiation in oral squamous cell carcinoma. Br J Cancer (30 March 2021).

 

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    2021-12-24 屋顶瞄爱赏月

    学习了

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    2021-10-13 yige2012
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