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Mapping the Brain's Glymphatic System.

Konstantinos Voumvourakis1,2, Nikolaos S Thomaidis3, Sotirios Tsiodras1

  • 1Attikon University Hospital, National and Kapodistrian University of Athens, Rimini 1, 12462 Athens, Greece.

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|February 27, 2026
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Summary

The glymphatic system clears brain waste via cerebrospinal fluid (CSF) and interstitial fluid (ISF) exchange, influenced by sleep and vascular health. Understanding its dysfunction is key for neurodegenerative disease biomarkers.

Keywords:
amyloid-βaquaporin-4blood–brain barriercerebrospinal fluidglymphatic systeminterstitial fluidintramural periarterial drainagemeningeal lymphaticsperivascular spacessleep

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Area of Science:

  • Neuroscience
  • Physiology
  • Biomedical Engineering

Background:

  • The glymphatic system facilitates brain waste clearance by transporting cerebrospinal fluid (CSF) along perivascular spaces.
  • Astrocyte endfeet, expressing aquaporin-4 (AQP4), are crucial for CSF-interstitial fluid (ISF) exchange.
  • Glymphatic function is modulated by physiological factors like sleep and vascular health, linking it to aging and neurodegeneration.

Purpose of the Study:

  • To synthesize current knowledge on the glymphatic system's structure, function, and role in cerebral homeostasis.
  • To explore the interplay between the glymphatic system and other clearance pathways.
  • To highlight the potential of understanding glymphatic dysfunction for diagnosing and treating neurodegenerative diseases.

Main Methods:

  • Review of recent anatomical and physiological studies on the glymphatic system.
  • Analysis of imaging techniques (e.g., MRI, in vivo two-photon imaging) and tracer-kinetic modeling.
  • Synthesis of evidence linking glymphatic function to solute transport and neurodegeneration.

Main Results:

  • The glymphatic system utilizes perivascular routes for fluid and solute transport, regulated by astrocyte AQP4 and physical drivers.
  • It clears various solutes, including metabolites, proteins (amyloid-β, tau), and tracers, interfacing with other clearance systems like BBB efflux and meningeal lymphatics.
  • Glymphatic flux is state-dependent (sleep) and influenced by vascular health, with dysfunction implicated in aging and neurodegeneration.

Conclusions:

  • The glymphatic system is a critical component of cerebral homeostasis, acting as a major waste clearance pathway.
  • Interconnected clearance routes form a network with complementary roles in maintaining brain health.
  • Targeting glymphatic dysfunction holds promise for developing diagnostic biomarkers and therapeutic strategies for neurodegenerative diseases.