Type I IFN controls chikungunya virus via its action on nonhematopoietic cells

Clémentine Schilte, Thérèse Couderc, Fabrice Chretien, Marion Sourisseau, Nicolas Gangneux, Florence Guivel-Benhassine, Anton Kraxner, Jürg Tschopp, Stephen Higgs, Alain Michault, Fernando Arenzana-Seisdedos, Marco Colonna, Lucie Peduto, Olivier Schwartz, Marc Lecuit, Matthew L. Albert

Research output: Contribution to journalArticlepeer-review

192 Scopus citations

Abstract

Chikungunya virus (CHIKV) is the causative agent of an outbreak that began in La Réunion in 2005 and remains a major public health concern in India, Southeast Asia, and southern Europe. CHIKV is transmitted to humans by mosquitoes and the associated disease is characterized by fever, myalgia, arthralgia, and rash. As viral load in infected patients declines before the appearance of neutralizing antibodies, we studied the role of type I interferon (IFN) in CHIKV pathogenesis. Based on human studies and mouse experimentation, we show that CHIKV does not directly stimulate type I IFN production in immune cells. Instead, infected non-hematopoietic cells sense viral RNA in a Cardif-dependent manner and participate in the control of infection through their production of type I IFNs. Although the Cardif signaling pathway contributes to the immune response, we also find evidence for a MyD88-dependent sensor that is critical for preventing viral dissemination. Moreover, we demonstrate that IFN-α/β receptor (IFNAR) expression is required in the periphery but not on immune cells, as IFNAR-/-→WT bone marrow chimeras are capable of clearing the infection, whereas WT→IFNAR-/- chimeras succumb. This study defines an essential role for type I IFN, produced via cooperation between multiple host sensors and acting directly on nonhematopoietic cells, in the control of CHIKV.

Original languageEnglish
Pages (from-to)429-442
Number of pages14
JournalJournal of Experimental Medicine
Volume207
Issue number2
DOIs
StatePublished - Feb 15 2010

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