HBV 病毒能够「训练」胎儿的免疫应答
乙型肝炎病毒(HBV)感染是一个很严 重的全球性健康问题,能够引起肝脏炎症以及癌症发生。新生儿是 HBV 慢性感染的一个大的受害群体,HBV 能够劫持未成熟的新生儿免疫系统,并通过诱导宿主产生免疫耐受建立持续的慢性感染状态。然而,新加坡临床科学研究所的 Pro.Michelle 和他的团队研究发现,出生前接触 HBV 病毒能够诱导胎儿建立一种「被训练」的免疫状态(trained immunity),这种「训练」能够促进胎儿固有免疫细胞成熟以及 Th1 细胞的发育 ,进一步增强脐带血中免疫细胞应答细菌感染的能力。这些「训练」效应与细胞因子环境改变有关,主要存在 IL-10 水平较低,同时在多数情况下还伴随高水平的 IL-12p40 和 IFN-α2 等情况。
sealed with ProLong Gold Antifade Reagent with DAPI (4,6-diamidino-2-phenylindole; Invitrogen) and HBsAg staining was visualized using TissueFAXS system (TissueGnostics). The exposure time for fluorescein isothiocyanate (FITC) filter (for HBsAg staining) on the microscope was adjusted based on the negative controls (healthy CB cells) and positive controls (healthy CB cells incubated with recombinant HBsAg),to minimize auto fluorescence/background staining without compromising signal. The total number of HBsAgt cells and the total number of DAPI-stained nuclei were manually counted in ten random high power fields (20 magnfication).