The tumour microenvironment and tumour angiogenesis play a critical role in the development and therapy of many cancers, but in vitro models reflecting these circumstances are rare. In this study, we describe the development of a novel tri-culture model, using non-small cell lung cancer (NSCLC) cell lines (A549 and Colo699) in combination with a fibroblast cell line (SV 80) and two different endothelial cell lines in a hanging drop technology. Endothelial cells aggregated either in small colonies in Colo699 containing microtissues or in tube like structures mainly in the stromal compartment of microtissues containing A549. An up-regulation of hypoxia and vimentin, ASMA and a downregulation of E-cadherin were observed in co- and tri-cultures compared to monocultures. Furthermore, a morphological alteration of A549 tumour cells resembling "signet ring cells" was observed in tri-cultures. The secretion of proangiogenic growth factors like vascular endothelial growth factor (VEGF) was measured in supernatants. Inhibition of these proangiogenic factors by using antiangiogenic drugs (bevacizumab and nindetanib) led to a significant decrease in migration of endothelial cells into microtissues. We demonstrate that our method is a promising tool for the generation of multicellular tumour microtissues and reflects in vivo conditions closer than 2D cell culture.

译文

肿瘤微环境和肿瘤血管生成在许多癌症的发展和治疗中起着至关重要的作用,但是反映这些情况的体外模型很少。在这项研究中,我们描述了一种新的三培养模型的开发,使用非小细胞肺癌 (NSCLC) 细胞系 (A549和Colo699) 与成纤维细胞系 (SV 80) 和两种不同的内皮细胞系在悬挂式滴技术中。内皮细胞聚集在包含微组织的Colo699中的小菌落中,或主要在包含a549的微组织的基质区室中的管状结构中。与单培养相比,在共培养和三培养中观察到缺氧和波形蛋白,ASMA的上调以及E-cadherin的下调。此外,在三培养物中观察到类似于 “印戒细胞” 的A549肿瘤细胞的形态变化。在上清液中测量了促血管生成生长因子 (如血管内皮生长因子 (VEGF)) 的分泌。通过使用抗血管生成药物 (贝伐单抗和nindetanib) 抑制这些促血管生成因子导致内皮细胞向微组织的迁移显着减少。我们证明了我们的方法是产生多细胞肿瘤微组织的有前途的工具,并且反映了比2D细胞培养更接近的体内条件。

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