A new study reveals a critical connection between the brain’s waste removal system – the glymphatic system – and the development of psychosis, with evidence suggesting dysfunction can begin in early childhood. The research, focused on individuals with 22q11.2 deletion syndrome (22q11DS), a genetic condition associated with increased psychosis risk, provides compelling evidence that impaired brain clearance may be a fundamental pathway to psychotic disorders.
The Glymphatic System: The Brain’s Cleaning Crew
The glymphatic system is responsible for flushing metabolic waste from the brain, much like a lymphatic system for the central nervous system. When this system malfunctions, toxins accumulate, leading to inflammation and cellular damage. This buildup has now been directly linked to an imbalance in brain activity, favoring excitation over inhibition – a key factor in psychosis.
The study analyzed brain scans from 85 individuals with 22q11DS over a 25-year period, comparing their brain development to healthy siblings. Participants aged 5-35 showed impaired brain clearance early on, and those who developed psychosis exhibited abnormal glymphatic system development. Researchers measured this using the ALPS index, which assesses water flow along brain “plumbing” channels.
Imbalance in Brain Signals
The study found that individuals with less effective glymphatic systems had a significant imbalance in neurotransmitters: excessive excitation from glutamate, and insufficient calming from GABA. This imbalance can be neurotoxic, particularly in vulnerable regions like the hippocampus, which is already linked to psychosis.
“Excessive excitation can become toxic to neurons and contribute to alterations in certain brain regions that are particularly vulnerable and involved in psychosis, such as the hippocampus.” – Alessandro Pascucci, University of Geneva
Early Intervention Potential
The findings suggest a critical window for intervention. If glymphatic dysfunction appears early in life, it may be possible to delay or even prevent the onset of psychosis. Current treatments focus primarily on managing symptoms after they emerge; this research points toward a proactive, preventative approach.
The study reinforces the idea that psychosis isn’t solely a chemical imbalance but can stem from a fundamental breakdown in brain maintenance. While glymphatic dysfunction isn’t unique to 22q11DS, this study provides crucial insights into how poor “brain cleaning” may contribute to psychotic episodes.
Further research into this critical developmental period could reveal more about the underlying mechanisms of psychosis and pave the way for targeted therapies.
