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Coupled brain activity, cerebrospinal fluid flow could indicate Alzheimer s risk

Penn State researchers have found that the signal of global brain activity is coupled to movement of cerebral spinal fluid in humans. It appears that the coupled movement cleans out the brain’s toxins as a person sleeps. The weaker the coupled movement, the higher the risk the person could develop Alzheimer’s disease. The signal can viewed via non-invasive brain imaging and could serve as a clinical marker to help in diagnosis. Penn State College of Engineering First described in 2012, the glymphatic system acts as a waste management system, washing out the proteins and other buildup that can hinder brain activity. The critical component of the system is the cerebrospinal fluid flow, according to Liu, which his research suggests is activated by the global BOLD signal activation. In sleep, the glymphatic system can speed up its cleaning processes significantly. 

Role of sleep-related brain activity in clearing toxic proteins and preventing Alzheimer s disease

 E-Mail IMAGE: The global brain signal in Alzheimer s disease patients is associated with weaker cerebrospinal fluid flow as compared with healthy controls view more  Credit: Feng Han and Xiao Liu @ The Pennsylvania State University Evidence of sleep-dependent low-frequency (PLOS Biology by Xiao Liu and colleagues at The Pennsylvania State University. This neuronal activity was more strongly linked with cerebrospinal fluid flow in healthy controls than higher risk groups and patients, and the findings could serve as a potential imaging marker for clinicians in evaluating patients. The development of Alzheimer s disease is believed to be driven by the buildup of the toxic proteins amyloid-β and tau in the brain. The brain s glymphatic system plays a crucial role in clearing these toxins and previous work has shown a possible relationship between sleep-dependent global brain activity and the glymphatic system by showing this activity is coupled by cerebrospinal fluid f

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