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Basic Science and Pathogenesis.

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Brain aging involves immune changes, but microglia

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Area of Science:

  • Neuroscience
  • Immunology
  • Genomics
  • Aging Research

Background:

  • Brain aging is a primary risk factor for neurodegenerative diseases, linked to immune dysregulation.
  • Microglia play a key role in neurodegeneration, but their aging and rejuvenation molecular changes are unclear at the single-cell level.

Purpose of the Study:

  • To investigate microglia heterogeneity and transcriptomic changes during brain aging and rejuvenation.
  • To explore the impact of young and old blood exposure on microglia across different brain regions.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was employed to analyze microglia.
  • Microglia were studied across four brain regions (cerebellum, cortex, hippocampus, striatum) under aging and parabiosis conditions (young/old blood exposure).

Main Results:

  • Eight distinct microglial subpopulations were identified, with seven reproducible in an independent dataset.
  • Shared and region-specific aging signatures were uncovered, revealing differential gene expression related to senescence, amyloid metabolism, and protein response.
  • Parabiosis with young/old blood distinctly affected gene expression, with the cerebellum being most sensitive and striatum least affected; a core 13-gene microglia activation signature was identified.

Conclusions:

  • Microglial transcriptomic dynamics vary regionally during aging and rejuvenation.
  • Findings provide insights into differential brain regional vulnerability and potential targets for modulating brain aging via microglia.