Document Report Card

ID: ALA1139005

Journal: J Med Chem

Title: Branched diacylglycerol-lactones as potent protein kinase C ligands and alpha-secretase activators.

Authors: Lee J, Kang JH, Han KC, Kim Y, Kim SY, Youn HS, Mook-Jung I, Kim H, Lo Han JH, Ha HJ, Kim YH, Marquez VE, Lewin NE, Pearce LV, Lundberg DJ, Blumberg PM.

Abstract: Using as our lead structure a potent PKC ligand (1) that we had previously described, we investigated a series of branched DAG-lactones to optimize the scaffold for PKC binding affinity and reduced lipophilicity, and we examined the potential utility of select compounds as alpha-secretase activators. Activation of alpha-secretase upon PKC stimulation by ligands causes increased degradation of the amyloid precursor protein (APP), resulting in enhanced secretion of sAPPalpha and reduced deposition of beta-amyloid peptide (Abeta), which is implicated in the pathogenesis of Alzheimer's disease. We modified in a systematic manner the C5-acyl group, the 3-alkylidene, and the lactone ring in 1 and established structure-activity relationships for this series of potent PKC ligands. Select DAG-lactones with high binding affinities for PKC were evaluated for their abilities to lead to increased sAPPalpha secretion as a result of alpha-secretase activation. The DAG-lactones potently induced alpha-secretase activation, and their potencies correlated with the corresponding PKC binding affinities and lipophilicities. Further investigation indicated that 2 exhibited a modestly higher level of sAPPalpha secretion than did phorbol 12,13-dibutyrate (PDBu).

CiteXplore: 16539391

DOI: 10.1021/jm0509391