摘要目的：观察感染 HBV 的 PBMC 经人绒毛膜癌滋养层细胞（Bewo 细胞）构建的胎盘屏障迁移情况，探讨 PBMC 作为载体转运 HBV 的生物学作用。方法培养并用细胞计数试剂盒-8检测培养 Bewo 细胞和 PBMC 的增殖和活性。用 HBV DNA 含量为5×106拷贝／mL 的乙型肝炎患者血清100μL 感染 PBMC 后，用羟基荧光素二醋酸盐琥珀酰亚胺脂（CFSE）荧光染料标记感染的细胞， transwell 小室建立 Bewo 细胞和感染 HBV 的 PBMC 共培养模型。用流式细胞仪检测感染 HBV 的PBMC 迁移情况，荧光定量 PCR 法检测 transwell 下室中 PBMC HBV DNA 含量。结果 PBMC、Bewo细胞均在接种24 h 左右开始增殖，120 h 左右开始进入生长停滞期。transwell 小室共培养0、12、24和48 h，下室中绿色荧光标记的 PBMC 量分别为（0．445±0．021）％、（21．180±4．653）％、（34．830±7．156）％和（64．185±3．161）％，随着培养时间的延长，下室中检测到的标有绿色荧光的 PBMC 量越多（F ＝68．983，P ＝0．001）。共培养24、48 h 时，下室 PBMC HBV DNA 分别为（1．925±0．431）×103、（2．565±0．361）×103拷贝／mL，即下室中的 PBMC 发生感染。结论 PBMC可以作为 HBV 肝外感染的靶细胞，利用 transwell 小室构建胎盘滋养层屏障可以为体外研究 HBV 跨胎盘传播提供新思路。

abstractsObjective To observe the transport of hepatitis B virus (HBV)-infected peripheral blood mononuclear cells (PBMC)through placental barrier set up by choriocarcinoma trophoblast cells (Bewo cells),and to explore the biological role of PBMC as a carrier for HBV transport.Methods Bewo cells and PBMC were cultured and their proliferation and activity were detected by cell counting kit (CCK)-8.One hundred μL serum containing 5 ×10 6 copy/mL HBV DNA was used to infect PBMC,and cells infected with HBV were labeled by fluorescent dye carboxyfluorescein diacetate succinimidyl ester (CFSE).A co-culture model of Bewo cells and HBV-infected PBMC was set up by transwell chamber. The migration of HBV-infected PBMC was detected by flow cytometry.Realtime fluorescence quantitative polymerase chain reaction method was used to detect HBV DNA contents of PBMC under transwell chamber.Results PBMC and Bewo cells proliferated at around 24 h and entered into growth stagnation at around 120 h.The contents of PBMC labeled by green fluorescent at 0,12,24 and 48 h during co-culture under chamber were (0.445 ±0.021)%,(21 .180 ± 4.653 )%,(34.830 ± 7.156 )% and (64.185 ± 3.161)%,respectively.The amount of PBMC marked green fluorescence increased over prolonged incubation time (F =68.983,P =0.001 ).PBMC HBV DNA contents at 24 and 48 h of co-culture under chamber were (1.925±0.431)×103 copy/mL and (2.565 ±0.361)×103 copy/mL,respectively,indicating that PBMC under chamber were infected with HBV.Conclusions PBMC may be a target for HBV infection in extrahepatic tissues.Placental trophoblastic barrier built by transwell chambers may provide new ideas to investigate HBV transmission across the placenta in vitro .