Abstract:
AIMS:Insufficient sleep has been found to result in varying degrees of cognitive impairment and emotional changes. Sleep was reported probably responsible for cleaning metabolic wastes in brain by increasing extracellular bulk flow. Herein, we propose that chronic sleep insufficiency in young adult wild-type mice is also linked with dysfunction of intracellular protein degradation pathways and microglia-mediated neuroinflammation, which are potentially important mechanisms in the initiation of neurodegeneration. METHODS:We applied the chronic sleep fragmentation (CSF) model to induce chronic sleep insufficiency in wild-type mice. After 2 months of CSF, cognitive function, amyloid-β accumulation, dysfunction of endosome-autophagosome-lysosome pathway, and microglia activation were evaluated. RESULTS:Following CSF, impairment of spatial learning and memory, and aggravated anxiety-like behavior in mice were identified by behavioral experiments. Increased intracellular amyloid-β accumulation was observed in cortex and hippocampus. Mechanistically, CSF could significantly enhance the expression of Rab5 (early endosome marker), Rab7 (late endosome marker), as well as LC3B (autophagosome marker), and autophagy-positive regulatory factors in brain detected by immunofluorescent staining and Western blot. In addition, activation of microglia was evident by enhanced CD68, CD16/32, and CD206 levels after CSF treatment. CONCLUSIONS:Chronic sleep fragmentation could initiate pathogenetic processes similar to the early stage of neurodegeneration, including dysfunction of endosome-autophagosome-lysosome pathway and microglia-mediated neuroinflammation. Our findings further strengthen the link between chronic sleep insufficiency and the initiation of neurodegeneration even if lack of genetic predisposition.
journal_name
CNS Neurosci Therjournal_title
CNS neuroscience & therapeuticsauthors
Xie Y,Ba L,Wang M,Deng SY,Chen SM,Huang LF,Zhang M,Wang W,Ding FFdoi
10.1111/cns.13218subject
Has Abstractpub_date
2020-02-01 00:00:00pages
215-227issue
2eissn
1755-5930issn
1755-5949journal_volume
26pub_type
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