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Muscularis macrophages initiate Parkinson's disease (PD) pathology in the gut's nervous system. Targeting these cells reduces pathology spread, neurodegeneration, and motor deficits, offering potential early PD biomarkers.

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Area of Science:

  • Neuroscience
  • Immunology
  • Gastroenterology

Background:

  • Parkinson's disease (PD) may originate in the enteric nervous system (ENS), with alpha-synuclein (αS) pathology spreading to the brain.
  • Constipation and T cell responses to αS in PD patients suggest early peripheral immune involvement.

Purpose of the Study:

  • Investigate the cellular mechanisms triggering αS pathology in the ENS and its gut-brain axis spread.
  • Determine the role of muscularis macrophages (ME-Macs) in PD pathogenesis.

Main Methods:

  • Utilized PD models to study ME-Macs' role in αS pathology and neurodegeneration.
  • Examined αS presence, endolysosomal dysfunction, and T cell modulation in ME-Macs.
  • Assessed the impact of directed ME-Mac depletion on PD pathology and motor function.

Main Results:

  • ME-Macs were found to contain misfolded αS and exhibit endolysosomal dysfunction.
  • ME-Macs modulate T cell expansion, which travels from the ENS to the brain.
  • ME-Mac depletion reduced αS pathology, T cell expansion, neurodegeneration, and motor dysfunction.

Conclusions:

  • ME-Macs act as early cellular initiators of αS pathology along the gut-brain axis in PD.
  • These findings suggest ME-Macs are crucial in PD pathogenesis and could be targets for early biomarkers.