Longevity & AgingBrain blood vessel vesicles in spinal fluid may flag vascular cognitive decline early
Vascular damage in the brain is a major but hard-to-measure contributor to cognitive decline. Researchers studied small extracellular vesicles released by brain endothelial cells (c-BEEVs) in cerebrospinal fluid from a multicenter cohort classified by the amyloid-tau-neurodegeneration framework. c-BEEV levels tracked vascular risk factors and small-vessel disease severity, and performed well for identifying vascular cognitive impairment. Combined with p-tau181, they helped distinguish vascular cognitive impairment from Alzheimer's disease. In mixed Alzheimer's and vascular pathology, c-BEEVs were the earliest abnormal marker, and they predicted cognitive decline in people without p-tau181 pathology. In a hypertensive mouse model with raised c-BEEVs and cognitive deficits, blocking vesicle secretion specifically in brain endothelial cells eased cognitive and synaptic impairment, suggesting the vesicles may contribute to damage rather than merely reflect it.
