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- W2018343146 abstract "gamma-Secretase mediates the intramembranous proteolysis of amyloid precursor protein (APP), Notch and other cellular substrates and is considered a prime pharmacological target in the development of therapeutics for Alzheimer's disease (AD). We describe here an efficient, new, simple, sensitive and rapid assay to quantify gamma-secretase activity in living cells by flow cytometry using two membrane-bound fluorescent probes, APP-GFP or C99-GFP, as substrates for gamma-secretase. The principle of the assay is based on the fact that the soluble intracellular domain of GFP-tagged APP (AICD-GFP) is released from the membrane into the cytosol following gamma-secretase cleavage. Using this feature, enzymatic activity of gamma-secretase could be deduced from the extent of the membrane retention of the probe observed after plasma membrane permeabilization and washout of the cleaved fraction. By applying two well-known gamma-secretase inhibitors (DAPT and L-685,458), we validated our assay showing that the positional GFP-based probes for gamma-secretase activity behave properly when expressed in different cell lines, providing the basis for the further development of a high-throughput and high content screening for AD targeted drug discovery. Moreover, by co-expression of different familial AD-linked mutated forms of presenilin--the key component of the gamma-secretase complex--in cells devoid of any endogenous gamma-secretase, our method allowed us to evaluate in situ the contribution of different presenilin variants to the modulation of the enzyme." @default.
- W2018343146 created "2016-06-24" @default.
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- W2018343146 date "2008-08-01" @default.
- W2018343146 modified "2023-10-02" @default.
- W2018343146 title "High content analysis of γ-secretase activity reveals variable dominance of presenilin mutations linked to familial Alzheimer's disease" @default.
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- W2018343146 doi "https://doi.org/10.1016/j.bbamcr.2008.03.012" @default.
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