联合应用活体染料CFDA-SE和SNARF-1检测混合淋巴细胞反应

Application of vital dye CFDA-SE and SNARF-1 to evaluate mixed lymphocyte reaction

目的建立一种能够对单向混合淋巴细胞反应中应答细胞的应答强度进行更全面评价的增殖检测方法。方法BALB/cJ小鼠淋巴结细胞经CFDA-SE标记后作为应答细胞,BALB/cJ或C57BL/6小鼠脾细胞经丝裂霉素C处理后再用SNARF-1标记,作为刺激细胞,进行混合培养。混合培养96h后收获细胞,用流式细胞术进行检测,分析SNARF-1-CFSE+应答细胞的增殖情况,并用ModFitTM软件拟和以获得更多增殖相关指数。结果随着应答细胞分裂代数的增加,CFSE荧光强度逐渐减弱直至与刺激细胞无法分开,通过划除SNARF-1阳性细胞以确定应答细胞,解决了这一问题。应用ModFitTM软件,获得应答细胞的前体频率和增殖指数等多项重要的增殖相关指标。结论联合应用CFSE和SNARF-1染色,结合流式细胞术,可作为评价混合淋巴细胞反应中应答细胞的应答强度的有力工具。

AIM： To establish a new method for more comprehensive evaluation of responsive intensity in one-way mixed lymphocyte reaction （MLR）. METHODS： CFDA-SE labeled lymphocytes from lymph nodes of BALB/cJ mice were applied as responder cells, and SNARF-1 labeled splenocytes from BALB/cJ or C57BL/6 mice which had been pretreated with mitomycin C were applied as stimulator cells to establish mixed lymphocyte culture （MLC）. After 96 h of culture, cells were harvested and analyzed by flow cytometry to acquire the proliferative information of SNARF-1 negative and CFSE positive staining responder cells. ModFit^TM software was then used to get more proliferation related index. RESULTS： With increasing division cycles, the CFSE fluorescence was diluted to the extent that the responder cells could not be discriminated from stimulator cells, which was resolved by gating SNARF-1 positive cells out to define responder cells. Several important proliferation related index were obtained by ModFit^TM software, such as precursor frequency and proliferation index, etc.. CONCLUSION. Our results show that application of vital dye CFDA-SE and SNARF-1, combined with flow cytometry is a powerful tool for evaluation of responsive intensity in oneway MLR.