Cerebrovascular pathology during the progression of experimental Alzheimer's disease

Neurobiology of Disease
Patrizia GiannoniNicola Marchi

Abstract

Clinical and experimental evidence point to a possible role of cerebrovascular dysfunction in Alzheimer's disease (AD). The 5xFAD mouse model of AD expresses human amyloid precursor protein and presenilin genes with mutations found in AD patients. It remains unknown whether amyloid deposition driven by these mutations is associated with cerebrovascular changes. 5xFAD and wild type mice (2 to 12months old; M2 to M12) were used. Thinned skull in vivo 2-photon microscopy was used to determine Aβ accumulation on leptomeningeal or superficial cortical vessels over time. Parenchymal microvascular damage was assessed using FITC-microangiography. Collagen-IV and CD31 were used to stain basal lamina and endothelial cells. Methoxy-XO4, Thioflavin-S or 6E10 were used to visualize Aβ accumulation in living mice or in fixed brain tissues. Positioning of reactive IBA1 microglia and GFAP astrocytes at the vasculature was rendered using confocal microscopy. Platelet-derived growth factor receptor beta (PDGFRβ) staining was used to visualize perivascular pericytes. In vivo 2-photon microscopy revealed Methoxy-XO4(+) amyloid perivascular deposits on leptomeningeal and penetrating cortical vessels in 5xFAD mice, typical of cerebral amyloid angiop...Continue Reading

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