Abstract
Hantaviruses infect human endothelial cells (ECs) and are known to cause vascular-permeability-based diseases, including hemorrhagic fever with renal syndrome (HFRS) and hantavirus pulmonary syndrome (HPS). The αvβ3 integrins, which are highly expressed on the surface of ECs, serve as hantavirus receptors. Specifically, the β3 integrin and vascular endothelial growth factor (VEGF) receptor 2 (VEGFR2) form a functional complex and interact with each other. Signaling through this complex causes cytoskeletal reorganization, which is one of the most important mechanisms underlying hyperpermeability. In this study, we show that VEGF dramatically enhances Hantaan virus (HTNV)-directed permeability and increases the reorganization of the cytoskeleton and the disruption of junctional organizations in an EC monolayer at 3 days postinfection. HTNV infection reduced the effect of VEGF on adhesion, migration, and the upregulation of β3 expression, but the infection alone upregulated the expression of β3 and VEGFR2. These results indicate that in addition to its role in blocking β3 integrin activation as reported previously, HTNV blocks the function of the complex of VEGFR2 and β3 integrin, and the dysfunction of the complex may contribute to cytoskeletal reorganization in an HTNV-directed hyperpermeability response to VEGF.
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This work was supported by the grant from National Basic Research Program of China (973 Program) (No. 2012CB518905) and National Natural Science Foundation of China (No. 30872215).
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Wang, W., Zhang, Y., Li, Y. et al. Dysregulation of the β3 integrin-VEGFR2 complex in Hantaan virus–directed hyperpermeability upon treatment with VEGF. Arch Virol 157, 1051–1061 (2012). https://doi.org/10.1007/s00705-012-1245-7
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DOI: https://doi.org/10.1007/s00705-012-1245-7