Glymphatic system

The glymphatic system is a macroscopic waste clearance pathway in the central nervous system (CNS) that facilitates the removal of metabolic byproducts, such as amyloid-beta and tau, through the convective exchange of cerebrospinal fluid (CSF) and interstitial fluid (ISF) [1]. This system is primarily driven by the pressure gradients created by arterial pulsations and is dependent on the water channel Aquaporin-4 (AQP4) localized on the vascular endfeet of astrocytes [2]. Dysfunction of the glymphatic system is strongly linked to the pathogenesis of neurodegenerative diseases, including Alzheimer's and Parkinson's, where the accumulation of toxic protein aggregates occurs [3]. While not a single molecular target, the glymphatic system is a major focus for therapeutic intervention, with research exploring drugs that can enhance its clearance capacity, particularly during sleep when the system is most active [4]. Pharmacological modulation often targets adrenergic signaling or AQP4 distribution to improve fluid flow and waste elimination [5].

Other names

Glial-lymphatic systemParavascular systemPerivascular clearance systemGlymphatic pathway

Modulation of the glymphatic system typically involves altering the perivascular space volume or the polarization of Aquaporin-4 (AQP4) water channels on astrocyte endfeet to facilitate the convective flow of cerebrospinal fluid (CSF) through the brain parenchyma [1][2].