登革病毒Ⅱ型引起原代HDMECs通透性变化机制的初步研究

摘要

Objective:To reveal the primary mechanism of changing permeability in DENV-2 infected pHDMECs. Methods:pHDMECs was incubated by DENV-2 on the concentration of 103 TCID50 ,and the penetrability of the cell was detected by Transwell at 4,8,12,24,48 h,respectively. Then,the partial sequence of DENV-2 NS1 was analyzed by Real time-PCR,and NS1 protein was detected by immunofluorescence and flow cytometer (FCM). The apoptosis rate of pHDMECs was assayed by FCM. Finally,IL-6 and IL-8 secreted by pHDMECs were analyzed by Real time-PCR and double antibody sandwich ELISA. Results:The relative expression of NS1 gene was elevated but NS1 protein was not detected;the permeability of DENV-2 infected pHDMECs had dramatically increased both at 24,48 h,but the apoptosis rate has little changed even been influenced by DENV-2 at 72 h. However,the relative expression of IL-6/IL-8 mRNA was boosted at 8,24 h[(2. 49±0. 50) and (6. 82±1. 69) fold,respectively,P<0. 05]. In protein level,compared with control(869. 6±50. 70)pg/ml,IL-6 secreted by DENV-2 infected pHDMECs could reach by(1 248. 8±86. 9)pg/ml(P<0. 05),and IL-8 was(1 331. 0±86. 3)pg/ml(P<0. 05) while the control was (967. 6±156. 6)pg/ml. Conclusion:Indeed,pHDMECs can be infected by DENV-2;the increasing permeability of DENV-2 infected pHDMECs may not be caused by the pHDMECs′ apoptosis but the enhancing of pro-inflammatory cytokine IL-6 /IL-8.%目的：：了解登革病毒Ⅱ型(Dengue virus Type 2,DENV-2)感染原代人真皮微血管内皮细胞(Primary Human dermal micro-vascular endothelial cells,pHDMECs)引起细胞通透性改变的机制。方法：用103 TCID50的DENV-2感染pHDMECs；于4、8、12、24、48 h Real time-PCR、免疫荧光法及流式细胞术检测DENV-2 NS1部分序列及蛋白；Transwell法检测细胞通透性；Real time -PCR和双抗体夹心ELISA法检测IL-6和IL-8的变化；流式细胞术检测24、48、72 h细胞凋亡。结果：DENV-2感染的pHDMECs病毒NS1基因相对表达上调,但未检测到病毒NS1蛋白；DENV-2感染的pHDMECs通透性在24、48 h显著升高；pHDMECs被感染72 h后凋亡也无明显变化；IL-6和IL-8 mRNA分别在8、24 h相对表达上调[IL-6：(2.49±0.5)倍,P<0.05；IL-8：(6.82±1.69)倍,P<0.05]；对照组和感染组分泌的IL-6于8 h分别为(869.6±50.7)、(1248.8±86.9)pg/ml,P<0.05；IL-8于48 h分别为(967.6±156.6)、(1331.0±86.3)pg/ml,P<0.05。结论：DENV-2能感染pHDMECs；pHDMECs被DENV-2感染后,细胞的通透性增加与凋亡无关,与促炎性细胞因子IL-6和IL-8明显上调关系密切。