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不同转移能力的肺癌细胞系的形态结构与黏附分子表达的比较
肿瘤多细胞球体(multicellular tumor spheroid MTS)是应用组织培养方法使肿瘤细胞生长形成实体细胞团,被称为"肿瘤的体外模型".细胞黏附分子(cell adhesion molecules,CAMs)是一类细胞膜受体分子(糖蛋白),它们在细胞生长、免疫反应及肿瘤转移等方面发挥重要的作用[1].近年来,随着对肿瘤转移过程研究的深入,细胞黏附分子与癌转移的关系逐渐受到关注,本实验拟在将MTS用于黏附分子表达的研究以及CD44V6和CD29与肺癌转移关系方面进行探讨,从而为肺癌侵袭转移的研究及其临床治疗提供依据.
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Objective To investigate the role of suppressor gene p16 in the process of differential regulation of retinoic acid (RA) on the A549 lung cancer cells.Methods Tumor suppressor gene p16 was transferred into A549 cells and the cells were treated with all-trans retinoic acid (ATR) at the dosage of 5×10-6 mol/L for 4 d. After that, the proliferation and differentiation of A549 cells were examined by growth curve and cytometry analysis, the change of lung lineage-specific marker MUC1 was tested by immunohistochemical staining. Meanwhile, Western blot was used to observe the change of p16 protein expression in A549 cells treated with ATRA.Results ATRA could obviously inhibit the growth and induce the differentiation of A549 Cells that were transferred with p16 gene. There were more cells arrested in G1/G0 phase and the expression of MUG1 was markedly down-regulated than in control cells. The expression of p16 protein was up-regulated in A549 cells treated with ATRA.Conclusion Suppressor gene p16 could enhance the effects of RA and proliferated suppression and differential induction of A549 cells.
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Id反义寡核苷酸对A549肺癌细胞的抑制及意义