PuSH - Publication Server of Helmholtz Zentrum München: Pathological activity of familial Alzheimer's disease-associated mutant presenilin can be executed by six different gamma-secretase complexes.

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Shirotani, K.* ; Tomioka, M.* ; Kremmer, E. ; Haass, C.* ; Steiner, H.*

Pathological activity of familial Alzheimer's disease-associated mutant presenilin can be executed by six different gamma-secretase complexes.

Neurobiol. Dis. 27, 102-107 (2007)

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gamma-Secretase is a protease complex, which catalyzes the final of two subsequent cleavages of the beta-amyloid precursor protein (APP) to release the amyloid-beta peptide (Abeta) implicated in Alzheimer's disease (AD) pathogenesis. In human cells, six gamma-secretase complexes exist, which are composed of either presenilin (PS) 1 or 2, the catalytic subunit, nicastrin, PEN-2, and either APH-1a (as S or L splice variants) or its homolog APH-1b. It is not known whether and how different APH-1 species contribute to the pathogenic activity of gamma-secretase complexes with familial AD (FAD)-associated mutant PS. Here we show that all known gamma-secretase complexes are active in APP processing and that all combinations of APH-1 variants with either FAD mutant PS1 or PS2 support pathogenic Abeta(42) production. Since our data suggest that pathogenic gamma-secretase activity cannot be attributed to a discrete gamma-secretase complex, we propose that all gamma-secretase complexes have to be explored and evaluated for their potential as AD drug target.

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