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The Brain's Glymphatic System: Current Controversies.

Humberto Mestre1, Yuki Mori2, Maiken Nedergaard3

  • 1Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, NY 14642, USA.

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The brain

Keywords:
amyloid-βaquaporin-4brain clearancecerebrospinal fluidglymphatic systemmeningeal lymphaticsperivascular spaces

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Area of Science:

  • Neuroscience
  • Cerebrospinal fluid dynamics
  • Neuroimmunology

Background:

  • The glymphatic system facilitates cerebrospinal fluid (CSF) transport and waste clearance in the central nervous system (CNS).
  • Discovery of meningeal lymphatic vessels suggests a role for lymphatic drainage in brain fluid regulation.
  • The glymphatic-lymphatic system is implicated in the clearance of proteins like amyloid-β, relevant to neurodegenerative diseases.

Purpose of the Study:

  • To review current knowledge on brain fluid transport systems, including the glymphatic and meningeal lymphatic pathways.
  • To identify gaps in experimental data and ongoing debates regarding these systems.
  • To discuss the potential of the glymphatic-lymphatic system as a therapeutic target for neurodegenerative conditions.

Main Methods:

  • Review of existing imaging studies on brain fluid transport.
  • Analysis of experimental data from fluid transport manipulations.
  • Discussion of controversies and knowledge gaps in the field.

Main Results:

  • Evidence supports directional fluid transport in the CNS via the glymphatic-lymphatic system.
  • This system plays a crucial role in clearing amyloid-β and other proteins.
  • The precise mechanisms and extent of glymphatic-lymphatic function remain subjects of ongoing research and debate.

Conclusions:

  • The glymphatic-lymphatic system is a significant factor in CNS fluid dynamics and waste removal.
  • Further research is needed to resolve existing controversies and fully elucidate its role in health and disease.
  • Targeting this system offers a promising avenue for developing new strategies against neurodegenerative diseases.