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A Combination of Ontogeny and CNS Environment Establishes Microglial Identity

F Chris Bennett1, Mariko L Bennett2, Fazeela Yaqoob2

  • 1Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA.

Neuron
|June 5, 2018
PubMed

Insights

Microglia identity is determined by their yolk-sac origin, not just the brain environment. Transplanted macrophages only achieve true microglial identity if they originate from the yolk sac, impacting brain disease research.

Area of Science:

  • Neuroscience
  • Immunology
  • Developmental Biology

Background:

  • Microglia, the brain's immune cells, originate from the yolk sac, a unique developmental path.
  • Understanding microglial identity is crucial for treating neurological diseases.

Purpose of the Study:

  • To investigate how ontogeny and the central nervous system (CNS) environment shape microglial identity.
  • To determine the factors essential for establishing and maintaining microglial characteristics.

Main Methods:

  • Development of a novel brain macrophage transplantation system in mice.
  • Transplantation of macrophages from various origins into microglia-deficient hosts.
  • Analysis of gene expression and identity markers post-transplantation.

Main Results:

  • Donor cells engraft efficiently in the CNS, and microglia retain identity even after in vitro culture.
  • Macrophages from yolk-sac origin fully acquire microglial identity in the CNS.
  • Macrophages from other origins, including human cells, express aberrant disease-associated genes.

Conclusions:

  • Microglial identity is primarily determined by their yolk-sac origin, with the CNS environment playing a secondary role.
  • This finding provides new insights into microglial biology and CNS diseases.
  • The study offers a platform for developing novel myeloid cell therapies for brain disorders.
Keywords:
Csf1rTmem119brain macrophageglial biologymicroglianeuroimmunityontogenytransplantation

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