γ-
Secretase is a multi-
subunit aspartyl protease that cleaves amyloid precursor protein (APP) and many other type 1 transmembrane proteins, including Notch, E-
cadherin, and ErbB4.
1 The proteolysis of APP by secretases produces beta amyloid (Aβ), a 39-
to 42-
amino acid peptide which forms the amyloid plaques that are characteristic of Alzheimer’s disease.
2 DBZ is a dipeptidic inhibitor of γ-
secretase that potently blocks the cleavage of Notch into its active signaling effector, Notch intracellular domain, in human T cell lymphoma (SupT1) cells (IC
50 = 1.7 nM).
3 Within 4 hours after a single 100 μM/kg dose, DBZ demonstrates anti-
Alzheimer activity in an APP transgenic mouse model characterized by high levels of Aβ40 by reducing Aβ40 levels by 71%.
3