IRF3 Regulates Neuroinflammatory Responses and the Expression of Genes Associated with Alzheimer's Disease

Overview

Journal J Neuroinflammation

Publisher Biomed Central

Date 2024 Aug 30

PMID 39215356

Authors

Radhika Joshi

Veronika Brezani

Gabrielle M Mey

Sergi Guixe-Muntet

Marti Ortega-Ribera

Yuan Zhuang

Adam Zivny

Sebastian Werneburg

Jordi Gracia-Sancho

Gyongyi Szabo

Affiliations

Soon will be listed here.

Abstract

The pathological role of interferon signaling is emerging in neuroinflammatory disorders, yet, the specific role of Interferon Regulatory Factor 3 (IRF3) in neuroinflammation remains poorly understood. Here, we show that global IRF3 deficiency delays TLR4-mediated signaling in microglia and attenuates the hallmark features of LPS-induced inflammation such as cytokine release, microglial reactivity, astrocyte activation, myeloid cell infiltration, and inflammasome activation. Moreover, expression of a constitutively active IRF3 (S388D/S390D: IRF3-2D) in microglia induces a transcriptional program reminiscent of the Activated Response Microglia and the expression of genes associated with Alzheimer's disease, notably apolipoprotein-e. Using bulk-RNAseq of IRF3-2D brain myeloid cells, we identified Z-DNA binding protein-1 (ZBP1) as a target of IRF3 that is relevant across various neuroinflammatory disorders. Lastly, we show IRF3 phosphorylation and IRF3-dependent ZBP1 induction in response to Aβ in primary microglia cultures. Together, our results identify IRF3 as an important regulator of LPS and Aβ -mediated neuroinflammatory responses and highlight IRF3 as a central regulator of disease-specific gene activation in different neuroinflammatory diseases.

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