Severe fever with thrombocytopenia syndrome phlebovirus non-structural protein activates TPL2 signalling pathway for viral immunopathogenesis

Choi, Y. et al. (2019) Severe fever with thrombocytopenia syndrome phlebovirus non-structural protein activates TPL2 signalling pathway for viral immunopathogenesis. Nature Microbiology, 4(3), pp. 429-437. (doi:10.1038/s41564-018-0329-x) (PMID:30617349) (PMCID:PMC6548314)

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Severe fever with thrombocytopenia syndrome phlebovirus (SFTSV), listed in the World Health Organization Prioritized Pathogens, is an emerging phlebovirus with a high fatality . Owing to the lack of therapies and vaccines , there is a pressing need to understand SFTSV pathogenesis. SFSTV non-structural protein (NSs) has been shown to block type I interferon induction and facilitate disease progression . Here, we report that SFTSV-NSs targets the tumour progression locus 2 (TPL2)-A20-binding inhibitor of NF-κB activation 2 (ABIN2)-p105 complex to induce the expression of interleukin-10 (IL-10) for viral pathogenesis. Using a combination of reverse genetics, a TPL2 kinase inhibitor and Tpl2 mice showed that NSs interacted with ABIN2 and promoted TPL2 complex formation and signalling activity, resulting in the marked upregulation of Il10 expression. Whereas SFTSV infection of wild-type mice led to rapid weight loss and death, Tpl2 mice or Il10 mice survived an infection. Furthermore, SFTSV-NSs P A and SFTSV-NSs K R that lost the ability to induce TPL2 signalling and IL-10 production showed drastically reduced pathogenesis. Remarkably, the exogenous administration of recombinant IL-10 effectively rescued the attenuated pathogenic activity of SFTSV-NSs P A, resulting in a lethal infection. Our study demonstrates that SFTSV-NSs targets the TPL2 signalling pathway to induce immune-suppressive IL-10 cytokine production as a means to dampen the host defence and promote viral pathogenesis.

Item Type:Articles
Additional Information:This work was partly supported by CA200422, CA180779, DE023926, DE027888, AI073099, AI116585, AI129496, AI140718, AI140705, the Hastings Foundation and the Fletcher Jones Foundation (J.U.J.), the Wellcome Trust Senior Investigator Award 099220/Z/12/Z and the Wellcome Trust/Royal Society Henry Dale Fellow (B.B.), the Korean National Research Foundation MEST 2015020957 (J.-S.L.), the National Science and Technology Major Project China 2013ZX09509102 (W.L.) and the Korea Health Industry Development Institute HI15C2817 (Y.-K.C.).
Glasgow Author(s) Enlighten ID:Brennan, Dr Benjamin
Authors: Choi, Y., Park, S.-J., Sun, Y., Yoo, J.-S., Pudupakam, R. S., Foo, S.-S., Shin, W.-J., Chen, S. B., Tsichlis, P. N., Lee, W.-J., Lee, J.-S., Li, W., Brennan, B., Choi, Y.-K., and Jung, J. U.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Nature Microbiology
Publisher:Nature Research
ISSN (Online):2058-5276
Published Online:07 January 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Nature Microbiology 4(3): 429-437
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
635361Molecular analyses of arbovirus-host interactionsMassimo PalmariniWellcome Trust (WELLCOTR)099220/B/12/ZMVLS III - CENTRE FOR VIRUS RESEARCH