应用流式-荧光原位杂交协助鉴别诊断EB病毒感染的淋巴细胞亚群

Application of Flow Cytometry Combined Fluorescence in Situ Hybridization to Indentify the Lymphocyte Subtypies with Epstein-Barr Virus Infection

目的:建立流式细胞术-荧光原位杂交联用技术(Flow-FISH),探讨Flow-FISH技术在临床EB病毒(Epstein-Barr virus)感染性疾病中感染细胞亚型鉴定的临床前诊断价值。方法:通过Ficoll-paque离心分离法收集重庆医科大学附属儿童医院招募的9例EBV感染患者的外周血标本中单个核细胞;通过qRT-PCR检测细胞EBER1及EBER2表达;通过荧光标记抗体对细胞表面标志物进行检测,经固定破膜剂对标记后细胞进行固定及破膜处理后与FISH探针37℃条件下过夜杂交,通过流式细胞仪、荧光显微镜检测细胞状态、表面抗原染色以及FISH探针与靶mRNA的结合。结果:优化固定破膜剂配方,建立0.2%Tween-20 4℃破膜15 min为破膜条件,此条件对细胞状态及表面抗原影响小,不干扰流式细胞术对细胞亚群判定。优化杂交液配方,探明20%甲酰胺和7%硫酸葡聚糖在37℃过夜条件下杂交为最优杂交条件,此条件下细胞形态及流式分群好,探针杂交效果佳。通过使用Flow-FISH技术能特异性区分各EBV;以及EBV;淋巴细胞系。通过Flow-FISH技术,成功鉴定临床外周血标本中的EBV;淋巴细胞亚群。结论:初步建立流式细胞术-荧光原位杂交联用检测EBV感染细胞亚群技术,为其进一步的临床前实验奠定基础。

Objective: To establish the technique that take the advantages of flow cytometry combined fluorescence in situ hybridization(Flow-FISH) to identify the Epstein-Barr virus(EBV) infected lymphocyte subtypies in patients′ peripheral blood sample. Methods: Peripheral Blood monocyte from 9 patients with EBV infection enrolled at Children′s Hospital in Chongqing Medical University were isolated by Ficoll-paque centrifugal separation. The expressions of EBER1, EBER2 in cell were detected by qRT-PCR. The surface markers of cell were detected by Flow cytometry after staining with their antibodies. The cell was treated Fix-Permeabilization Buffer before hybridization with fluorescent labeled probe at 37 ℃ overnight. The cell status, surface markers and targeted mRNA are detected by flow cytometry and fluorescence microscope. Results: It was optimized that the Fix-Permeabilization Buffer and recipe with 0.2% Tween-20 were picked out as providing a good cell integrity and high resolution of surface markers. Hybridization with 20% formamide and 7% dextran sulfate at 37 ℃ overnight is the optimal hybridization condition as a good hybridization effect, a detectable cell integrity and a high resolution of cell markers under flow cytometry detection. Finally, upon the established Flow-FISH method, lymphocyte subpopulations of the EBV;cells from cell lines and blood samples of patients were identified successfully. Conclusion: A Flow-FISH technology is established,which can be applied in the identification of EBV infected cell subtypes. This research provides a foundmental for its application in clinical test in EBV+ related proliferative diseases.