CXCL10 Signaling Drives Chronic Inflammation in Arthritogenic Alphavirus Infections
Researchers using an age-stratified mouse model found that arthritogenic alphaviruses — including chikungunya, o'nyong nyong, and Mayaro viruses — trigger a CXCL10-driven immune signaling cascade that promotes harmful inflammation while impairing viral clearance. The pathway, involving elevated CXCL10 expression, STAT3 phosphorylation, and skewed CD4+ T cell accumulation, was conserved across all three viruses tested. Understanding this mechanism could open new therapeutic targets for preventing the chronic joint disease these viruses cause in humans.
A preprint study posted to bioRxiv describes a conserved immunological mechanism by which arthritogenic alphaviruses — chikungunya virus (CHIKV), o'nyong nyong virus (ONNV), and Mayaro virus (MAYV) — drive persistent inflammatory joint disease. Using an age-stratified murine model, researchers found that ONNV infection elevated expression of the chemokine CXCL10 in infected tissues, which was associated with preferential recruitment of CD4+ T cells over CD8+ T cells and increased viral persistence. The skewed T cell response was characterized by heightened STAT3 phosphorylation and upregulation of RORγt, a transcription factor linked to pro-inflammatory T cell differentiation. Critically, CHIKV and MAYV infections recapitulated the same features, suggesting this CXCL10-STAT3 axis represents a shared pathogenic program rather than a virus-specific phenomenon. When researchers experimentally disrupted this signaling axis, CD4+ T cell accumulation decreased, T cell differentiation states shifted, and tissue viral burden was reduced. The findings suggest that the host's CXCL10-biased immune response is paradoxically both highly inflammatory and ineffective at clearing virus, creating conditions that favor chronic disease. The authors propose this pathway as a potential target for therapeutic intervention in alphavirus-associated arthritis.
What's missing
As a preprint, this study has not yet undergone peer review. The research is conducted entirely in a murine model, and it remains unknown whether the same CXCL10-STAT3 mechanism operates with the same significance in human alphavirus infections. The study does not address whether therapeutic disruption of this axis in already-infected animals affects long-term joint pathology outcomes.
What different sources said
- bioRxivCenter
CXCL10-driven STAT3 signaling programs pathogenic CD4+ T cell responses and limits antiviral immunity during arthritogenic alphavirus infection
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