Environmental Control of Astrocyte Pathogenic Activities in CNS Inflammation

Cell. 2019 Jan 24;176(3):581-596.e18. doi: 10.1016/j.cell.2018.12.012. Epub 2019 Jan 17.

Abstract

Genome-wide studies have identified genetic variants linked to neurologic diseases. Environmental factors also play important roles, but no methods are available for their comprehensive investigation. We developed an approach that combines genomic data, screens in a novel zebrafish model, computational modeling, perturbation studies, and multiple sclerosis (MS) patient samples to evaluate the effects of environmental exposure on CNS inflammation. We found that the herbicide linuron amplifies astrocyte pro-inflammatory activities by activating signaling via sigma receptor 1, inositol-requiring enzyme-1α (IRE1α), and X-box binding protein 1 (XBP1). Indeed, astrocyte-specific shRNA- and CRISPR/Cas9-driven gene inactivation combined with RNA-seq, ATAC-seq, ChIP-seq, and study of patient samples suggest that IRE1α-XBP1 signaling promotes CNS inflammation in experimental autoimmune encephalomyelitis (EAE) and, potentially, MS. In summary, these studies define environmental mechanisms that control astrocyte pathogenic activities and establish a multidisciplinary approach for the systematic investigation of the effects of environmental exposure in neurologic disorders.

Keywords: IRE1α; Sigmar1; XBP1; astrocyte; glia; inflammation; multiple sclerosis; neurodegeneration; zebrafish.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Astrocytes / metabolism*
  • Central Nervous System / immunology
  • Central Nervous System / metabolism*
  • Computational Biology / methods
  • Encephalomyelitis, Autoimmune, Experimental / immunology
  • Endoribonucleases / metabolism
  • Environment
  • Environmental Exposure / adverse effects
  • Genome
  • Genomics
  • Humans
  • Inflammation / metabolism
  • Linuron / adverse effects
  • Mice
  • Mice, Inbred C57BL
  • Multiple Sclerosis / immunology
  • Protein-Serine-Threonine Kinases / metabolism
  • Receptors, sigma / drug effects
  • Receptors, sigma / metabolism
  • Signal Transduction
  • X-Box Binding Protein 1 / metabolism
  • Zebrafish

Substances

  • Receptors, sigma
  • X-Box Binding Protein 1
  • XBP1 protein, human
  • Linuron
  • ERN1 protein, human
  • Protein-Serine-Threonine Kinases
  • Endoribonucleases