Impaired angiogenesis in a transgenic mouse model of cerebral amyloidosis |
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Authors: | Paris Daniel Patel Nikunj DelleDonne Anthony Quadros Amita Smeed Robert Mullan Michael |
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Affiliation: | The Roskamp Institute, 2040 Whitfield Avenue, Sarasota, FL 34243, USA. dparis@rdfn.org |
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Abstract: | Abeta peptides are naturally occurring peptides, which are thought to play a key role in the pathophysiology of Alzheimer's disease (AD). In AD cases, levels of soluble and insoluble Abeta peptides increase in the brain as well as in the cerebrovasculature, a phenomenon that does not occur in extra-cranial vessels. There are frequently anomalies in the cerebrovasculature in AD, and despite increases in several pro-angiogenic factors in AD brain, evidence for increased vascularity is lacking; in fact there is evidence to the contrary. It has also been recently shown that Abeta peptides may have profound anti-angiogenic effects in vitro and in vivo. We therefore investigated whether there is evidence for altered angiogenesis in the vasculature in a transgenic mouse model of Abeta amyloidosis (Tg APPsw line 2576). In vitro, the formation of capillary-like structures on a reconstituted extracellular matrix by endothelial cells isolated from Tg APPsw is impaired. Ex vivo, the sprouting of new capillaries from arterial explants (over expressing Abeta) isolated from 9-month-old Tg APPsw is reduced compared to arterial explants isolated from control littermates. In addition, Tg APPsw mice show a reduction in vascular density in the cortex and hippocampus compared to control littermates. Altogether, our data suggest that the over expression of APPsw in the vasculature may oppose angiogenesis. |
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