肿瘤相关成纤维细胞的生物学特征及Transwell共培养对胃癌细胞生长和转移的影响

Biological features of tumor associated fibroblasts and effect of Transwell co-culture on proliferation and metastasis of gastric cancer cells

目的 培养原代人胃癌相关成纤维细胞(cancer associated fibroblasts,CAFs)和正常成纤维细胞(normal fibroblasts,NFs),探究生物学特性及对胃癌细胞影响。方法 CAFs和NFs分离培养后,MTT法绘制生长曲线,免疫荧光法、Western blot、qRT-PCR检测α-SMA和Vimentin表达。MGC-803与CAFs、NFs进行Transwell共培养,Transwell法检测胃癌迁移和侵袭,MTT法比较细胞活力及AMD3100影响,pH计、乳酸酶法、DCFH-DA法测定共培养体系酸化、乳酸及活性氧(ROS)含量。结果 CAFs、NFs呈长梭形、多角形等,CAFs增殖和重叠生长现象均高于NFs。CAFs细胞α-SMA和Vimentin为阳性表达,而NFs为低表达或阴性。胃癌细胞活力低密度共培养组>中密度组>高密度组,CAFs共培养体系出现pH值降低,乳酸、ROS含量高现象,且只有CAFs-低密度共培养组促癌效果明显。结论 胃癌细胞与CAFs、NFs共培养受比例影响较大,低密度共培养更能明显提高胃癌细胞的增殖和迁移能力,而高密度共培养可能会反过来抑制肿瘤细胞的增长和转移,可能与乳酸、ROS含量有关。

Aim To culture primary human gastric cancer associated fibroblasts(CAFs) and normal fibroblasts(NFs), and to explore the biological characteristics and their effects on gastric cancer cells. Methods After isolation and culture of CAFs and NFs, growth curve was drawn by MTT. The α-smooth muscle actin(α-SMA) and Vimentin were detected by Immunofluorescence, Western blot and qRT-PCR. MGC-803 cells were co-cultured with CAFs and NFs in Transwell suspension mode. The migration and invasion ability of gastric cancer cells was detected by Transwell. The proliferation activity and AMD3100 on CAFs-gastric cancer co-culture system were compared by MTT. The acidic property, lactic acid and ROS contents of co-culture system were determined by PH meter, lactic acid and DCFH-DA method. Results The morphology of CAFs, NFs cells were in long spindle or flat star shape. The proliferation ability and overlapping growth phenomenon of CAFs were higher than those of NFs. The expression of α-SMA and Vimentin cells was positive in CAFs, but low or negative in NFs cells. The activity of gastric cancer in low density co-culture group > medium density group>high density group, the PH value of CAFs co-culture system decreased, the content of lactic acid and ROS was high, and only CAFs low density co-culture group had significant effect on promoting cancer. Conclusions The co-culture of gastric cancer cells with CAFs and NFs is greatly affected by the proportion. Low density co-culture can significantly improve the proliferation and metastasis ability of gastric cancer cells. High density co-culture may in turn inhibit the growth and metastasis of cancer cells, which may be related to the content of lactic acid and ROS.