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Basic Microglial Functions and How They Go Awry in Neurodegenerative Disease.

Jordan E McKinney1, Mariko L Bennett1,2, F Chris Bennett3

  • 1Division of Neurology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA;

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Summary
This summary is machine-generated.

Microglia, the brain's immune cells, become dysfunctional in neurodegenerative diseases, shifting from protective to harmful roles. This review explores how these cells fail and strategies to restore their function for treating brain disorders.

Keywords:
Alzheimer's diseaseinterferonopathymicrogliamicroglia replacementmicrogliopathiesneurodegeneration

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Area of Science:

  • Neuroimmunology
  • Cellular Biology
  • Neurodegenerative Diseases

Background:

  • Microglia are crucial for brain health, performing immune and repair functions.
  • In neurodegenerative diseases, microglia lose their homeostatic capabilities.
  • Their functions, like phagocytosis and immune signaling, can become detrimental.

Purpose of the Study:

  • To review the transition of microglial function from competence to dysfunction in neurodegeneration.
  • To examine the mechanisms underlying microglial failure.
  • To discuss potential therapeutic strategies targeting dysfunctional microglia.

Main Methods:

  • Literature review focusing on microglial roles in brain health and disease.
  • Analysis of case studies including Alzheimer's disease, inherited microgliopathies, and Aicardi-Goutières syndrome.
  • Examination of genetic and environmental factors influencing microglial function.

Main Results:

  • Microglial dysfunction manifests as metabolic exhaustion, lysosomal overload, inflammatory gain of function, or unresponsiveness.
  • These failures contribute to disease progression in conditions like Alzheimer's disease.
  • Genetic and environmental factors converge to induce "microglial incompetence."

Conclusions:

  • Dysfunctional microglia play a significant role in the pathogenesis of various neurodegenerative diseases.
  • Understanding the mechanisms of microglial failure is key to developing new treatments.
  • Emerging strategies aim to restore or replace dysfunctional microglia to combat neurodegeneration.