Journal
NATURE REVIEWS NEUROLOGY
Volume 11, Issue 8, Pages 457-470Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nrneurol.2015.119
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Funding
- NIH/NIA/NHLBI [AG022374, AG13616, AG12101, AG008051, HL118624, HL111724, AG20245]
- NIH/NINDS [NS028642]
- Torsten Soderberg Foundation at the Royal Swedish Academy of Sciences
- Swedish Research Council
- Knut and Alice Wallenberg Foundation
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL111724, R01HL118624] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS028642] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [R01AG012101, R01AG020245, P30AG008051, R01AG013616, R01AG022374] Funding Source: NIH RePORTER
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Accumulation of toxic protein aggregates-amyloid-beta (A beta) plaques and hyperphosphorylated tau tangles-is the pathological hallmark of Alzheimer disease (AD). A beta accumulation has been hypothesized to result from an imbalance between A beta production and clearance; indeed, A beta clearance seems to be impaired in both early and late forms of AD. To develop efficient strategies to slow down or halt AD, it is critical to understand how A beta is cleared from the brain. Extracellular A beta deposits can be removed from the brain by various clearance systems, most importantly, transport across the blood-brain barrier. Findings from the past few years suggest that astroglial-mediated interstitial fluid (ISF) bulk flow, known as the glymphatic system, might contribute to a larger portion of extracellular A beta (eA beta) clearance than previously thought. The meningeal lymphatic vessels, discovered in 2015, might provide another clearance route. Because these clearance systems act together to drive eA beta from the brain, any alteration to their function could contribute to AD. An understanding of A beta clearance might provide strategies to reduce excess A beta deposits and delay, or even prevent, disease onset. In this Review, we describe the clearance systems of the brain as they relate to proteins implicated in AD pathology, with the main focus on A beta.
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