title: Discovery of a novel pharmacological and structural class of gamma secretase modulators derived from the extract of Actaea racemosa.
abstract: A screen of a library of synthetic drugs and natural product extracts identified a botanical extract that modulates the processing of amyloid precursor protein (APP) in cultured cells to produce a lowered ratio of amyloid-beta peptide (1-42) (Aβ42) relative to Aβ40. This profile is of interest as a potential treatment for Alzheimer's disease. The extract, from the black cohosh plant (Actaea racemosa), was subjected to bioassay guided fractionation to isolate active components. Using a combination of normal-phase and reverse-phase chromatography, a novel triterpene monoglycoside, 1, was isolated. This compound was found to have an IC(50) of 100 nM for selectively reducing the production of amyloidogenic Aβ42 while having a much smaller effect on the production of Aβ40 (IC(50) 6.3 μM) in cultured cells overexpressing APP. Using IP-MS methods, this compound was found to modulate the pool of total Aβ produced by reducing the proportion of Aβ42 while increasing the relative amounts of shorter and less amyloidogenic Aβ37 and Aβ39. Concentrations of 1 sufficient to lower levels of Aβ42 substantially (up to 10 μM) did not significantly affect the processing of Notch or other aspects of APP processing. When 1 (10 μg) was administered to CD-1 normal mice intracerebroventricularly, the level of Aβ42 in brain was reduced. Assays for off-target pharmacology and the absence of overt signs of toxicity in mice dosed with compound 1 suggest a comparatively selective pharmacology for this triterpenoid. Compound 1 represents a new lead for the development of potential treatments for Alzheimer's disease via modulation of gamma-secretase.
authors.affiliation: Satori Pharmaceuticals, Incorporated, Cambridge, Massachusetts, United States.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Findeis
authors.forename: Frank
authors.initials: F
authors.lastname: Schroeder
authors.forename: Timothy D
authors.initials: TD
authors.lastname: McKee
authors.forename: Debra
authors.initials: D
authors.lastname: Yager
authors.forename: Patrick C
authors.initials: PC
authors.lastname: Fraering
authors.forename: Steffen P
authors.initials: SP
authors.lastname: Creaser
authors.forename: Wesley F
authors.initials: WF
authors.lastname: Austin
authors.forename: Jon
authors.initials: J
authors.lastname: Clardy
authors.forename: Rong
authors.initials: R
authors.lastname: Wang
authors.forename: Dennis
authors.initials: D
authors.lastname: Selkoe
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Eckman
mesh_terms: D053829:Amyloid Precursor Protein Secretases / Q000037:antagonists & inhibitors*; D016229:Amyloid beta-Peptides / Q000187:drug effects*; D016564:Amyloid beta-Protein Precursor / Q000187:drug effects* / Q000378:metabolism; D000818:Animals; D001921:Brain / Q000187:drug effects; D002853:Chromatography, Liquid / Q000379:methods; D056148:Chromatography, Reverse-Phase / Q000379:methods; D031885:Cimicifuga / Q000737:chemistry*; D006027:Glycosides / Q000302:isolation & purification / Q000494:pharmacology; D051379:Mice; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018517:Plant Roots / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry; D014315:Triterpenes / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: D016229:Amyloid beta-Peptides; D016564:Amyloid beta-Protein Precursor; D006027:Glycosides; D010936:Plant Extracts; D014315:Triterpenes; D053829:Amyloid Precursor Protein Secretases