{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,4]],"date-time":"2026-11-04T22:23:43Z","timestamp":1793831023293,"version":"4.6.1"},"reference-count":69,"publisher":"Society for Neuroscience","issue":"15","license":[{"start":{"date-parts":[[2017,10,12]],"date-time":"2017-10-12T00:00:00Z","timestamp":1507766400000},"content-version":"vor","delay-in-days":218,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Neurosci."],"published-print":{"date-parts":[[2017,4,12]]},"abstract":"<jats:p>Accumulation and deposition of amyloid-\u03b2 (A\u03b2) in the brain represent an early and perhaps necessary step in the pathogenesis of Alzheimer's disease (AD). A\u03b2 accumulation leads to the formation of A\u03b2 aggregates, which may directly and indirectly lead to eventual neurodegeneration. While A\u03b2 production is accelerated in many familial forms of early-onset AD, increasing evidence indicates that impaired clearance of A\u03b2 is more evident in late-onset AD. To uncover the mechanisms underlying impaired A\u03b2 clearance in AD, we examined the role of low-density lipoprotein receptor-related protein 1 (LRP1) in astrocytes. Although LRP1 has been shown to play critical roles in brain A\u03b2 metabolism in neurons and vascular mural cells, its role in astrocytes, the most abundant cell type in the brain responsible for maintaining neuronal homeostasis, remains unclear. Here, we show that astrocytic LRP1 plays a critical role in brain A\u03b2 clearance. LRP1 knockdown in primary astrocytes resulted in decreased cellular A\u03b2 uptake and degradation. In addition, silencing of LRP1 in astrocytes led to downregulation of several major A\u03b2-degrading enzymes, including matrix metalloproteases MMP2, MMP9, and insulin-degrading enzyme. More important, conditional knock-out of the<jats:italic>Lrp1<\/jats:italic>gene in astrocytes in the background of APP\/PS1 mice impaired brain A\u03b2 clearance, exacerbated A\u03b2 accumulation, and accelerated amyloid plaque deposition without affecting its production. Together, our results demonstrate that astrocytic LRP1 plays an important role in A\u03b2 metabolism and that restoring LRP1 expression and function in the brain could be an effective strategy to facilitate A\u03b2 clearance and counter amyloid pathology in AD.<\/jats:p><jats:p><jats:bold>SIGNIFICANCE STATEMENT<\/jats:bold>Astrocytes represent a major cell type regulating brain homeostasis; however, their roles in brain clearance of amyloid-\u03b2 (A\u03b2) and underlying mechanism are not clear. In this study, we used both cellular models and conditional knock-out mouse models to address the role of a critical A\u03b2 receptor, the low-density lipoprotein receptor-related protein 1 (LRP1) in astrocytes. We found that LRP1 in astrocytes plays a critical role in brain A\u03b2 clearance by modulating several A\u03b2-degrading enzymes and cellular degradation pathways. Our results establish a critical role of astrocytic LRP1 in brain A\u03b2 clearance and shed light on specific A\u03b2 clearance pathways that may help to establish new targets for AD prevention and therapy.<\/jats:p>","DOI":"10.1523\/jneurosci.3442-16.2017","type":"journal-article","created":{"date-parts":[[2017,3,9]],"date-time":"2017-03-09T02:05:24Z","timestamp":1489025124000},"page":"4023-4031","source":"Crossref","is-referenced-by-count":266,"title":["Astrocytic LRP1 Mediates Brain A\u03b2 Clearance and Impacts Amyloid 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