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<p>Interferon (IFN) and inflammation are the key early defence mechanisms that combat pathogen infection. The cytosolic DNA sensor cGAS activates immune signaling via the stimulator of interferon genes (STING) protein. Emerging evidence suggests crosstalk between innate immune DNA and RNA sensing, implicating a role of STING protein in RNA virus infection. This study characterizes STING in the context of Japanese encephalitis virus (JEV), an RNA virus of the <i>flaviviridae</i> family. We observe that activation of type I IFN through MAVS is essential for cGAS and STING activation. Knockdown, null mutant and inhibitor studies confirm that STING restricts JEV replication independently of IFNβ signaling and autophagy. Transcriptomic analysis of STING<sup>gt/gt</sup> (Goldenticket) bone-marrow derived macrophages (BMDMs) shows enhanced IFN response, but reduced activation of inflammatory cytokines and chemokines. Phosphorylated STING is recruited to the virus replication complex (RC), marked by the non-structural protein NS1, subsequently triggering the assembly of the NLRP3 inflammasome on the RC. STING proton channel activity is essential for NLRP3 inflammasome activation, IL-1β production, and activation of pyroptotic cell death markers. STING<sup>gt/gt</sup> mice, show higher viremia, earlier disease onset, reduced survival, and decreased brain inflammation. These findings establish STING as a key regulator of JEV-induced inflammation and antiviral defence.</p><p></p>

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STING is a key driver of Japanese encephalitis virus induced inflammatory response

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月30日

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  • Simran Chhabra,
  • Dhruvin Patel,
  • Kiran Bala Sharma,
  • Vishal Sah,
  • Krishnan H. Harshan,
  • Santosh Chauhan,
  • Manjula Kalia

摘要

Interferon (IFN) and inflammation are the key early defence mechanisms that combat pathogen infection. The cytosolic DNA sensor cGAS activates immune signaling via the stimulator of interferon genes (STING) protein. Emerging evidence suggests crosstalk between innate immune DNA and RNA sensing, implicating a role of STING protein in RNA virus infection. This study characterizes STING in the context of Japanese encephalitis virus (JEV), an RNA virus of the flaviviridae family. We observe that activation of type I IFN through MAVS is essential for cGAS and STING activation. Knockdown, null mutant and inhibitor studies confirm that STING restricts JEV replication independently of IFNβ signaling and autophagy. Transcriptomic analysis of STINGgt/gt (Goldenticket) bone-marrow derived macrophages (BMDMs) shows enhanced IFN response, but reduced activation of inflammatory cytokines and chemokines. Phosphorylated STING is recruited to the virus replication complex (RC), marked by the non-structural protein NS1, subsequently triggering the assembly of the NLRP3 inflammasome on the RC. STING proton channel activity is essential for NLRP3 inflammasome activation, IL-1β production, and activation of pyroptotic cell death markers. STINGgt/gt mice, show higher viremia, earlier disease onset, reduced survival, and decreased brain inflammation. These findings establish STING as a key regulator of JEV-induced inflammation and antiviral defence.