1. Enterovirus A71 capsid protein VP1 increases blood–brain barrier permeability and virus receptor vimentin on the brain endothelial cells
- Author
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Jun Li, Qiyun Ma, Wenjing Wang, Jiandong Sun, Zhixiao Sun, Mingshun Zhang, Nan Wang, and Juan Xu
- Subjects
0301 basic medicine ,Virulence Factors ,Enterovirus A71 ,viruses ,Vimentin ,Blood–brain barrier ,Article ,Virus ,Capillary Permeability ,Mice ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,chemistry.chemical_compound ,0302 clinical medicine ,Virology ,Parenchyma ,Enterovirus Infections ,medicine ,Animals ,Enterovirus ,Evans Blue ,Tight junction ,biology ,Virus receptor ,Brain ,Endothelial Cells ,virus diseases ,VP1 ,biochemical phenomena, metabolism, and nutrition ,Cell biology ,Mice, Inbred C57BL ,030104 developmental biology ,medicine.anatomical_structure ,Claduin-5 ,Neurology ,Capsid ,chemistry ,Blood-Brain Barrier ,030220 oncology & carcinogenesis ,biology.protein ,Capsid Proteins ,Female ,Neurology (clinical) - Abstract
Enterovirus A71 (EV-A71) is the major cause of severe hand-foot-and-mouth diseases (HFMD), especially encephalitis and other nervous system diseases. EV-A71 capsid protein VP1 mediates virus attachment and is the important virulence factor in the EV-A71pathogenesis. In this study, we explored the roles of VP1 in the permeability of blood–brain barrier (BBB). Sera albumin, Evans blue, and dextran leaked into brain parenchyma of the 1-week-old C57BL/6J mice intracranially injected with VP1 recombinant protein. VP1 also increased the permeability of the brain endothelial cells monolayer, an in vitro BBB model. Tight junction protein claudin-5 was reduced in the brain tissues or brain endothelial cells treated with VP1. In contrast, VP1 increased the expression of virus receptor vimentin, which could be blocked with VP1 neutralization antibody. Vimentin expression in the VP1-treated brain endothelial cells was regulated by TGF-β/Smad-3 and NF-κB signal pathways. Moreover, vimentin over-expression was accompanied with compromised BBB. From these studies, we conclude that EV-A71 virus capsid protein VP1 disrupted BBB and increased virus receptor vimentin, which both may contribute to the virus entrance into brain and EV-A71 CNS infection.
- Published
- 2019