Abstract：
:Amyloid-beta (Abeta) deposits are one of the hallmarks of the neuropathological degeneration observed in Alzheimer's disease (AD) and Abeta concentrations have been reported to vary in different brain regions of AD patients. Abeta is produced by the sequential cleavage of amyloid precursor protein (APP) by beta-secretase and gamma-secretase, respectively. Previous studies have shown that over-expression of the gamma-secretase complex leads to increased gamma-secretase proteolytic activity increasing Abeta production. However, it is not known whether brain regions with highest Abeta concentration also express relatively higher levels of gamma-secretase activity. Accordingly, the relationship between Abeta levels and gamma-secretase activity across brain regions was investigated and correlated in the brains of transgenic and non-transgenic rodents commonly used in AD research. The data demonstrated that Abeta levels do vary in different brain regions in both transgenic and non-transgenic mice but are not correlated with regional gamma-secretase activity. Furthermore, this study demonstrated that while mutations in the APP and PS1 sequences affect the absolute Abeta levels this is not reflected in an increase in gamma-secretase proteolytic activity. The data in the current paper indicate that this assay is able to measure the level of gamma-secretase activity in rodent species. Using this methodology will aid our understanding of physiological gamma-secretase function.
journal_name
J Neurosci Methodsjournal_title
Journal of neuroscience methodsauthors
Goggi JL,Lewis HD,Mok J,Harrison T,Shearman MS,Atack JR,Best JDdoi
10.1016/j.jneumeth.2006.05.001subject
Has Abstractpub_date
2006-10-30 00:00:00pages
246-52issue
2eissn
0165-0270issn
1872-678Xpii
S0165-0270(06)00227-5journal_volume
157pub_type
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