| First Author | Rosas-Hernandez H | Year | 2020 |
| Journal | Neuroscience | Volume | 440 |
| Pages | 48-55 | PubMed ID | 32450297 |
| Mgi Jnum | J:298661 | Mgi Id | MGI:6478550 |
| Doi | 10.1016/j.neuroscience.2020.05.024 | Citation | Rosas-Hernandez H, et al. (2020) Impaired Amyloid Beta Clearance and Brain Microvascular Dysfunction are Present in the Tg-SwDI Mouse Model of Alzheimer's Disease. Neuroscience 440:48-55 |
| abstractText | Alzheimer's disease (AD) pathology is characterized by amyloid plaques containing amyloid beta (Abeta) peptides, neurofibrillary tangles containing hyperphosphorylated tau protein, and neuronal loss. In addition, Abeta deposition in brain microvessels, known as cerebral amyloid angiopathy (CAA), increases blood-brain barrier (BBB) permeability and induces vascular dysfunction which aggravates AD pathology. The aim of the present study was to characterize neurovascular dysfunction in the Tg-SwDI mouse model of AD. Isolated brain capillaries from wild type (WT) and Tg-SwDI mice were used to evaluate the expression of monomeric and aggregated forms of Abeta, P-glycoprotein (P-gp), the receptor for advance glycation end-products (RAGE) and the tight junction (TJs) proteins occludin and claudin-5. Cultured brain endothelial cells were used to analyze barrier function via fluorescein flux. Isolated capillaries from Tg-SwDI mice contained increased levels of aggregated and oligomeric Abeta compared to WT animals. Isolated capillaries from Tg-SwDI had decreased levels of P-gp, which transports Abeta from brain to blood, and increased levels of RAGE, which transports Abeta from blood to brain. In addition, the TJ protein occludin was decreased in Tg-SwDI mice relative to WT mice, which correlated with an increase in BBB permeability in cultured brain endothelial cells. These findings demonstrated that Tg-SwDI mice exhibit Abeta aggregation that is due, in part, to impaired Abeta clearance driven by both a decrease in P-gp and increase in RAGE protein levels in brain capillaries. Abeta aggregation promotes a decrease in the expression of the TJ protein occludin, and as consequence an increase in BBB permeability. |
