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  • Verma, N., et al. (författare)
  • A beta efflux impairment and inflammation linked to cerebrovascular accumulation of amyloid-forming amylin secreted from pancreas
  • 2023
  • Ingår i: Communications Biology. - : Springer Science and Business Media LLC. - 2399-3642. ; 6:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Impairment of vascular pathways of cerebral beta-amyloid (A beta) elimination contributes to Alzheimer disease (AD). Vascular damage is commonly associated with diabetes. Here we show in human tissues and AD-model rats that bloodborne islet amyloid polypeptide (amylin) secreted from the pancreas perturbs cerebral A beta clearance. Blood amylin concentrations are higher in AD than in cognitively unaffected persons. Amyloid-forming amylin accumulates in circulating monocytes and co-deposits with A beta within the brain microvasculature, possibly involving inflammation. In rats, pancreatic expression of amyloid-forming human amylin indeed induces cerebrovascular inflammation and amylin-A beta co-deposits. LRP1-mediated A beta transport across the blood-brain barrier and A beta clearance through interstitial fluid drainage along vascular walls are impaired, as indicated by A beta deposition in perivascular spaces. At the molecular level, cerebrovascular amylin deposits alter immune and hypoxia-related brain gene expression. These converging data from humans and laboratory animals suggest that altering bloodborne amylin could potentially reduce cerebrovascular amylin deposits and A beta pathology.
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