Does daily rhythm control of water channels affect brain waste clearance throughout the day?

No significant differences in AQP4 localization or expression levels were found between day and night in the mouse brain.

• AQP4 is a water channel protein located primarily in the brain's perivascular regions.
• Previous hypotheses suggested that AQP4 expression is influenced by circadian rhythms, peaking during sleep.
• Direct evidence for circadian regulation of AQP4 was found to be limited in this investigation.
• The study assessed AQP4 at both protein and mRNA levels using various microscopy techniques.
• Key components of the dystrophin-associated protein complex, which helps anchor AQP4, also showed no significant changes.
• Findings indicate that any circadian differences in glymphatic function are likely due to factors other than AQP4 expression.

Simplified