Microglia in prion diseases

J Clin Invest. 2017 Sep 1;127(9):3230-3239. doi: 10.1172/JCI90605. Epub 2017 Jul 17.


Prion diseases are a group of progressive and fatal neurodegenerative disorders characterized by deposition of scrapie prion protein (PrPSc) in the CNS. This deposition is accompanied by neuronal loss, spongiform change, astrogliosis, and conspicuous microglial activation. Here, we argue that microglia play an overall neuroprotective role in prion pathogenesis. Several microglia-related molecules, such as Toll-like receptors (TLRs), the complement system, cytokines, chemokines, inflammatory regulators, and phagocytosis mediators, are involved in prion pathogenesis. However, the molecular mechanisms underlying the microglial response to prion infection are largely unknown. Consequently, we lack a comprehensive understanding of the regulatory network of microglial activation. On the positive side, recent findings suggest that therapeutic strategies modulating microglial activation and function may have merit in prion disease. Moreover, studies on the role of microglia in prion disease could deepen our understanding of neuroinflammation in a broad range of neurodegenerative disorders.

Publication types

  • Review

MeSH terms

  • Animals
  • Brain / metabolism
  • Chemokines / metabolism
  • Complement System Proteins
  • Cytokines / metabolism
  • Humans
  • Inflammation
  • Mice
  • Microglia / metabolism
  • Microglia / physiology*
  • Neurodegenerative Diseases / pathology
  • Phagocytosis
  • Phenotype
  • PrPSc Proteins / metabolism*
  • Prion Diseases / metabolism*
  • Prion Diseases / pathology
  • Prions / metabolism*
  • Reactive Oxygen Species / metabolism
  • Toll-Like Receptors / metabolism


  • Chemokines
  • Cytokines
  • PrPSc Proteins
  • Prions
  • Reactive Oxygen Species
  • Toll-Like Receptors
  • Complement System Proteins