长链非编码RNA TUSC7对人恶性黑色素瘤A375细胞增殖的影响

Expression of lncRNA TUSC7 in melanoma A375 cell line and its effect on proliferation and apoptosis of melanoma cells

目的探讨长链非编码RNA TUSC7在人皮肤恶性黑色素瘤(malignant melanoma,CMM)细胞株中的表达及其对人黑色素瘤细胞增殖的影响。方法采用qRT-PCR技术检测人皮肤CMM组织和良性痣组织,CMM细胞株G-361、SK-MEL-1、A375、A875和正常人表皮黑色素细胞系HEMn-LP中TUSC7的表达。将CMM A375细胞分别转染TUSC7过表达质粒(pcDNATUSC7组)和阴性对照序列(pcDNA3.1组),分别采用CCK-8法和克隆形成实验检测两组细胞的增殖情况,采用流式细胞术检测细胞凋亡。结果 60例CMM组织和CMM细胞株中TUSC7的表达水平显著低于20例良性痣组织和正常人表皮黑色素细胞(P<0.05)。A375细胞过表达质粒pcDNA-TUSC7转染组中TUSC7表达水平显著高于pcDNA3.1组,差异有统计学意义(P<0.05)。CCK-8和克隆集落形成实验结果表明pcDNA-TUSC7组A375细胞增殖指数和细胞克隆数均显著低于pcDNA3.1组,流式细胞术检测凋亡率结果表明pcDNA-TUSC7组A375细胞凋亡率均显著高于pcDNA3.1组,差异有统计学意义(P<0.05)。结论 CMM细胞株中TUSC7呈低表达,上调TUSC7表达能显著抑制CMM细胞的增殖和克隆形成能力,促进细胞凋亡,TUSC7可能参与CMM的恶性进展。

Purpose To investigate the expression level and the role of TUSC7 in human cutaneous malignant melanoma （CMM）. Methods Quantitative real time-PCR （qRT-PCR） assay was performed to detect the expression of TUSC7 in 60 cases of CMM tissues, 20 cases of benign nevus, 4 CMM cell lines, and one normal human epidermal melanocytes. Then overexpression of TUSC7 was performed and its role in tumor progression was explored. Results TUSC7 expression was significantly downregulated in primary CMM tissues （ n = 60） compared to benign nevi （ n = 20 ） , which were significantly downregulated in all the four melanoma cell lines, especially in A375 cells, compared with the normal melanocytes cells （ all P 〈 0. 05）. In comparison with the A375 cells transfected with the empty plasmid, those transfeeted with peDNA-TUSC7 showed an obvious decrease in the proliferation and colony formation activity, while increase in the apoptosis rate （ all P 〈 0.05 ）. Conclusion Our results suggested that the dysregulation of TUSC7 may play an important role in the CMM progression.