Dr Yvonne Couch - Brain Drain: The Controversy Around Glymphatics
About this episode
Dr Yvonne Couch discusses the controversy surrounding the existence of the brain's glymphatic system and its implications for understanding brain health.
Dr Yvonne Couch narrates her blog written for Dementia Researcher. Yvonne got pulled into an accidental group chat argument with colleagues about whether the brain's glymphatic system actually exists, and it escalated into a full blown journal club debate. In this blog she walks through the case for it: how the lymphatic system works everywhere else in the body, why the brain's tightly packed vasculature makes a proper lymphatic network hard to picture, and how a 2012 paper from Maiken Nedergaard's group tied two older observations together into the modern glymphatic hypothesis. She then sets out where the critics push back, from the discovery of cerebral amyloid angiopathy patterns that do not fit a directional flow, to modelling that questions whether arterial pulsation can move enough fluid, to the 2015 discovery of actual lymphatic vessels in the meninges. Worth reading if you have ever nodded along to "the brain flushes itself while you sleep" without knowing quite how contested that sentence is. https://www.dementiaresearcher.nihr.ac.uk/blog-brain-drain-the-controversy-around-glymphatics/ -- Dr Yvonne Couch is a Research Fellow and Associate Professor at the University of…
People in this episode
Host: Dementia Researcher
Guest: Dr Yvonne Couch
Topics covered
- glymphatic system
- brain health
- dementia
- vascular function
- scientific debate
Keywords
- glymphatic hypothesis
- cerebral amyloid angiopathy
- arterial pulsation
- extracellular vesicles
- dementia after stroke
Mentioned in this episode
Organizations: University of Oxford
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