Wagner Vivian P, Martins Manoela D, Amoura Esra, Zanella Virgilio G, Roesler Rafael, de Farias Caroline B, Bingle Colin D, Vargas Pablo A, Bingle Lynne
Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba 13414-903, Brazil.
Oral and Maxillofacial Pathology, Department of Clinical Dentistry, University of Sheffield, Sheffield S10 2TA, UK.
Biomedicines. 2020 Nov 24;8(12):531. doi: 10.3390/biomedicines8120531.
The brain-derived neurotrophic factor (BDNF)/tyrosine receptor kinase B (TrkB) pathway was previously associated with key oncogenic outcomes in a number of adenocarcinomas. The aim of our study was to determine the role of this pathway in mucoepidermoid carcinoma (MEC). Three MEC cell lines (UM-HMC-2, H253 and H292) were exposed to Cisplatin, the TrkB inhibitor, ANA-12 and a combination of these drugs. Ultrastructural changes were assessed through transmission electron microscopy; scratch and Transwell assays were used to assess migration and invasion; and a clonogenic assay and spheroid-forming assay allowed assessment of survival and percentage of cancer stem cells (CSC). Changes in cell ultrastructure demonstrated Cisplatin cytotoxicity, while the effects of ANA-12 were less pronounced. Both drugs, used individually and in combination, delayed MEC cell migration, invasion and survival. ANA-12 significantly reduced the number of CSC, but the Cisplatin effect was greater, almost eliminating this cell population in all MEC cell lines. Interestingly, the spheroid forming capacity recovered, following the combination therapy, as compared to Cisplatin alone. Our studies allowed us to conclude that the TrkB inhibition, efficiently impaired MEC cell migration, invasion and survival in vitro, however, the decrease in CSC number, following the combined treatment of ANA-12 and Cisplatin, was less than that seen with Cisplatin alone; this represents a limiting factor.
脑源性神经营养因子(BDNF)/酪氨酸受体激酶B(TrkB)信号通路先前已被证实与多种腺癌的关键致癌结果相关。我们研究的目的是确定该信号通路在黏液表皮样癌(MEC)中的作用。三种MEC细胞系(UM-HMC-2、H253和H292)分别暴露于顺铂、TrkB抑制剂ANA-12以及这两种药物的联合使用。通过透射电子显微镜评估超微结构变化;划痕试验和Transwell试验用于评估迁移和侵袭能力;克隆形成试验和球状体形成试验用于评估细胞存活情况以及癌症干细胞(CSC)的比例。细胞超微结构变化显示了顺铂的细胞毒性作用,而ANA-12的作用则不太明显。单独使用或联合使用这两种药物均可延迟MEC细胞的迁移、侵袭和存活。ANA-12显著减少了CSC的数量,但顺铂的作用更强,几乎在所有MEC细胞系中消除了这一细胞群体。有趣的是,与单独使用顺铂相比,联合治疗后球状体形成能力有所恢复。我们的研究得出结论,TrkB抑制可有效损害MEC细胞在体外的迁移、侵袭和存活能力,然而,联合使用ANA-12和顺铂治疗后CSC数量的减少幅度小于单独使用顺铂,这是一个限制因素。