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Basic Science and Pathogenesis.

Veronika Pak1, Joon Hwan Hong1, Gleb Bezgin1

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Researchers identified whole-brain cell communication patterns that explain brain atrophy in 13 neurodegenerative conditions. Key ligand-receptor interactions, particularly involving astrocytes and neurons, offer potential therapeutic targets for neurodegeneration.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Genomics

Background:

  • Disrupted cell interactions in the brain can cause inflammation, vascular issues, and neuronal death.
  • Understanding these interactions is crucial for comprehending neurodegenerative disease development.
  • This study investigates whole-brain cell communication linked to atrophy patterns in 13 neurodegenerative conditions.

Purpose of the Study:

  • To identify specific cell-cell interactions across the human brain that correlate with atrophy patterns in various neurodegenerative diseases.
  • To uncover the underlying signaling pathways involved in these interactions and their role in neurodegeneration.

Main Methods:

  • Generated 1,050 whole-brain maps of ligand-receptor interactions for neurons, glia, and endothelial cells using post-mortem brain tissue from healthy donors.
  • Employed Partial Least Squares Regression (PLS) analysis to link ligand-receptor pairs to atrophy patterns in 13 neurodegenerative conditions.
  • Conducted gene enrichment analyses to identify signaling pathways associated with neurodegeneration-related atrophy.

Main Results:

  • The COL1A1-CD36 interaction was a dominant factor explaining atrophy patterns, particularly in frontotemporal lobar degeneration (FTLD), early- and late-onset Alzheimer's disease (EOAD/LOAD).
  • Significant bidirectional signaling was observed between astrocytes and neurons, alongside neuron-microglia and neuron-neuron signaling.
  • Enriched pathways included Slit/Robo-mediated axon guidance, opioid signaling, and the Alzheimer's disease presenilin pathway.

Conclusions:

  • Whole-brain ligand-receptor interactions, especially neuron-astrocyte, neuron-microglia, and neuron-neuron signaling, are identified as key drivers of atrophy patterns in multiple neurodegenerative conditions.
  • These identified ligands and receptors represent potential therapeutic targets for neurodegenerative diseases.
  • The findings advance the understanding of the molecular mechanisms underlying neurodegeneration.