无血清共培养条件下脐带间充质干细胞对奶牛乳腺上皮细胞的增殖作用

摘要

Objective To explore the proliferation-promoting effect of bovine mammary gland epithelial cells (BMECs) co-cultured with umbilical cord mesenchymal stem cells (UC-MSCs) in serum-free culture mediuum.Methods Bovine UC-MSCs and BMECs were selected for co-culturing in direct or indirect contact.In the direct contact culture groups, UC-MSCs and BMECs were co-cultured at concentration ratios of 2∶1, 1∶1, 1∶2, 1∶3, 1∶4, 1∶5, and 1:10, respectively.In the indirect contact culture group, the supernatant of UC-MSCs was used as the conditioned medium to re-suspend BMECs.In the control groups, UC-MSCs and BMECs were cultured alone.The cell growth status in each group was observed at 0, 4, 8, 12, 24, 36, 48, 60, 72 h after culture, and cell proliferation was detected by cell counting kit-8 (CCK-8) assay.Results At 48 h, the optical density of the conditioned medium-BMECs group was significantly higher compared with the control groups (P<0.05).Meanwhile, the optical density in the direct contact group at a concentration ratio of 1∶2 reached the peak, which was extremely significantly higher compared with the control groups (P<0.01) and significantly higher compared with the other direct contact culture groups and the conditioned medium-BMECs group (P<0.05).Conclusions Co-culture of UC-MSCs and BMECs in serum-free culture medium is capable to promote the proliferation of BMECs, and the co-culture by cell-to-cell contact has a better effect.The optimal concentration ratio of UC-MSCs to BMECs is 1∶2, and the optimal culture time is 48 h.%目的 旨在探究无血清共培养条件下脐带间充质干细胞(umbilical cord mesenchymal stem cells, UC-MSCs)对奶牛乳腺上皮细胞(bovine mammary gland epithelial cells, BMECs)的增殖作用.方法 选取生长状态最佳的UC-MSCs和BMECs,将两种细胞以直接接触和间接接触两种共培养方式作为试验组,直接接触是按照UC-MSCs:BMECs分别为2∶1、1∶1、1∶2、1∶3、1∶4、1∶5、1∶10的浓度梯度混合共培养,间接接触则是提取UC-MSCs的上清液作为条件培养基重悬BMECs,对照组为UC-MSCs和BMECs单纯培养组,并设阴性空白对照,于0、4、8、12、24、36、48、60、72 h时观察各组细胞的生长变化,采用CCK-8法检测各组细胞增殖情况.结果 在48 h,条件培养基BMECs组A值显著高于对照组(P<0.05),而1∶2浓度组A值达到峰值,极显著高于对照组(P<0.01),显著高于其他各浓度组和条件培养基BMECs组(P<0.05).结论 无血清条件下,UC-MSCs和BMECs共培养可以促进BMECs增殖,直接接触促增殖效果优于间接接触,且最适比例为1∶2,最佳时间是48 h.