摘要
本研究通过Transwell细胞隔离培养体系探讨骨髓源间充质干细胞(MSC)对脐血(CB)来源细胞因子诱导杀伤细胞(CIK)/自然杀伤细胞(NK)CD69的表达以及对培养体系中CD4+CD25+T调节(Treg)细胞量比的影响。利用聚碳酯膜孔径0.4μm的Transwell隔离细胞培养系统将实验组分为隔离培养(Transwell)组和直接混合(mix-ture)培养组;将MSC和CIK/NK细胞按1:20、1:50和1:100的比例分别在Transwell组和mixture组中进行隔离和直接混合培养,每组6个重复孔;培养48小时后通过流式细胞术检测各组CIK/NK细胞上CD69的表达以及培养体系中CD4+CD25+细胞量比的变化。结果显示:加入MSC的实验各组CB-CIK细胞和NK细胞上表达的CD69比例均显著低于对照组(p值均<0.001).Transwell组中的CIK和NK细胞上表达的CD69,在MSC的高浓度组(1:20组)均显著低于低浓度组(1:50组和1:100组),其中CIK细胞组间的p值分别为0.046、0.020;NK细胞组间的p值均为0.000。mixture组中不同比例组间CIK细胞上表达的CD69无显著性差异,而NK细胞上CD69的表达在MSC的高浓度组(1:20组)均显著低于低浓度组(1:50组和1:100组)。加入MSC的CB-CIK/NK细胞体系中的CD4+CD25+细胞的量比不论在Transwell还是mixture组中均显著高于对照组(p值均<0.01);在Transwell组中,CIK/NK细胞体系中的CD4+CD25+细胞的量比在1:20组、1:50组均显著高于1:100组;在mixture各组中,CIK/NK细胞体系中的CD4+CD25+T调节细胞的量比均有显著性差异。MSC的高浓度组(1:20组),CIK/NK细胞体系中的CD4+CD25+细胞量比在mixture组显著高于Transwell组;而在MSC的低浓度组(1:50组和1:100组),2组体系中的CD4+CD25+细胞量比无显著性差异。结论:MSC能以直接接触或间接作用的方式抑制异基因CIK/NK细胞的活化,这可能与MSC能上调培养体系中的CD4+CD25+Treg细胞量比有关,且这种作用与MSC的数量呈浓度依赖关系。
This study was purposed to explore the effect of bone marrow derived mesenchymal stem cells (MSCs) on the expression of CD69 on cytokine-induced killer( CIK)/natural killer(NK) cells derived from cord blood and on the quantity ratio of CD4^+ CD25^+ T regulatory cells in CIK/NK cell culture system using Transwell non-contact cell culture system. The experiments were divided into two groups.. Transwell non-contact culture and mixture culture. The ratio of MSC to CIK/NK cells was 1 : 20, 1 : 50 and 1 : 100. In mixture culture groups, MSC and CIK/ NK cells were cocultured by together contact as the same ratio of Transwell non-contact culture groups. The expression of CD69 on CIK/ NK cells, as well as the quantity ratio of CD4^+ CD25^+ T regulatory cells in CIK/NK cell culture were evaluated by flow cytometry. The results showed that the expression of CD69 on CIK/NK cells in experimental groups were significantly lower than that in control group(p 〈0. 001 ). As to TransweU groups, CD69 expression on the CIK/NK cells at 1:20 ratio of MSC and CIK/NK was significantly lower than that at 1 : 50 and 1 : 100 ratio. There were no differences in the expression of CD69 on CIK cells in mixture groups with various MSC ratios, whereas the expression of CD69 on NK cells at 1: 20 ratio was significantly lower than that at 1:50 and 1 : 100. The quantity ratio of CD4^+ CD25^+ ceils in CIK/ NK cell culture system of experimental groups with MSC co-culture was significantly higher than that in control. As to Transwell groups, the ratio of CD4^+ CD25^+ cells in CIK/NK cell culture system at 1 : 20 and 1 : 50 was significantly higher than that at 1 : 100. The quantity ratio of CD4^+ CD25^+ cells in CIK/NK cell culture system showed significant differences in various mixture groups. As to 1 : 20 ratio the amount of CD4^+ CD25^+ cells in CIK/NK cell culture system of mixture groups was significantly higher than that in Transwell groups, while there were no differences of the quantity ratio of CD4^+ CD25^+ cells in CIK/NK cell culture at 1 : 50 and 1 : 100. It is concluded that either by non-contact Transwell or mixed co-culture, the MSC can suppress the activation of allogeneic CB-CIK/NK cells, which maybe relate to up-regulating the ratio of CD4^+ CD25^+ T regulatory cells in CIK/NK cell culture system in dose-dependent manner.
出处
《中国实验血液学杂志》
CAS
CSCD
2009年第5期1301-1306,共6页
Journal of Experimental Hematology
基金
国家自然科学基金资助项目(编号30500469)
广州科学仪器协作共用网基金资助项目(编号2006034)
中山大学北校区学生科研基金资助项目(编号2006031)