首页|Defective fractalkine‐CX3CR1 signaling aggravates neuroinflammation and affects recovery from cuprizone‐induced demyelination

Defective fractalkine‐CX3CR1 signaling aggravates neuroinflammation and affects recovery from cuprizone‐induced demyelination

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  • NSTL
  • Wiley
Abstract Microglia have been implicated in multiple sclerosis (MS) pathogenesis. The fractalkine receptor CX3CR1 limits the activation of pathogenic microglia and the human polymorphic CX3CR1I249/M280 (hCX3CR1I249/M280) variant increases disease progression in models of MS. However, the role of hCX3CR1I249/M280 variant on microglial activation and central nervous system repair mechanisms remains unknown. Therefore, using transgenic mice expressing the hCX3CR1I249/M280 variant, we aimed to determine the contribution of defective CX3CR1 signaling to neuroinflammation and remyelination in the cuprizone model of focal demyelination. Here, we report that mice expressing hCX3CR1I249/M280 exhibit marked demyelination and microgliosis following acute cuprizone treatment. Nanostring gene expression analysis in demyelinated lesions showed that hCX3CR1I249/M280 but not CX3CR1‐deficient mice up‐regulated the cuprizone‐induced gene profile linked to inflammatory, oxidative stress, and phagocytic pathways. Although CX3CR1‐deficient (CX3CR1‐KO) and fractalkine‐deficient (FKN‐KO) mice displayed a comparable demyelination and microglial activation phenotype to hCX3CR1I249/M280 mice, only CX3CR1‐deficient and CX3CR1‐WT mice showed significant myelin recovery 1 week from cuprizone withdrawal. Confocal microscopy showed that hCX3CR1I249/M280 variant inhibits the generation of cells involved in myelin repair. Our results show that defective fractalkine signaling contributes to regional differences in demyelination, and suggest that the CX3CR1 pathway activity may be a key mechanism for limiting toxic gene responses in neuroinflammation. Cover Image for this issue:?https://doi.org/10.1111/jnc.15416

cuprizoneCX3CR1Fractalkinemicrogliamultiple sclerosismyelination

Erzsebet Kokovay、Chin‐Hsing Annie Lin、Astrid E. Cardona、Andrew S. Mendiola、Kaira A. Church、Sandra M. Cardona、Difernando Vanegas、Shannon A. Garcia、Wendy Macklin、Sergio A. Lira、Richard M. Ransohoff

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Cell Systems and Anatomy,UT‐Health Science Center San Antonio

Department of Integrative Biology,The University of Texas at San Antonio

Department of Molecular Microbiology & Immunology,The University of Texas at San Antonio

Department of Cell and Developmental Biology,University of Colorado School of Medicine

Precision Immunology Institute Icahn School of Medicine at Mount Sinai

Third Rock Ventures

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2022

10.1111/jnc.15616

Journal of neurochemistry.

Journal of neurochemistry.

ISSN：0022-3042
年,卷(期)：2022.162(5)
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