The Glymphatic System: A Beginner’s Guide

Summary & key facts

The glymphatic system is a recently discovered pathway in the brain that uses perivascular tunnels made by astroglial cells to clear soluble proteins and waste and to move nutrients and signaling molecules around the brain. It works mainly during sleep and is much less active when we are awake, so sleep may help the brain remove potentially toxic proteins such as β-amyloid. Early studies show glymphatic flow is reduced in some illnesses, and that poor glymphatic function might play a role in neurodegenerative disease, traumatic brain injury, and stroke, but the idea is still new and researchers are still testing how it all fits together.

Key facts:

• The glymphatic system is a macroscopic waste-clearance system in the brain that runs along perivascular tunnels formed by astroglial (star-shaped) cells.
• This system helps eliminate soluble proteins and metabolic waste from the central nervous system.
• The glymphatic system also helps spread compounds across the brain, including glucose, lipids, amino acids, growth factors, and neuromodulators.
• Glymphatic function is strongest during sleep and is largely disengaged during wakefulness.
• Scientists suggest that one reason sleep is needed is to allow the brain to clear potentially neurotoxic waste products, including β-amyloid.
• Research reviewed in this article reports that glymphatic function is reduced in various diseases, and such failure might contribute to problems seen in neurodegenerative disorders, traumatic brain injury, and stroke, but causality is not e

Topics

Cerebrospinal fluid and hydrocephalus Neurological disorders and treatments Traumatic Brain Injury Research

Categories

Cellular and Molecular Neuroscience Life Sciences Neuroscience

Tags

Biology Cell biology Cerebrospinal fluid Chemistry Electroencephalography Function (biology) Glymphatic system Nervous system Neuroscience Wakefulness