The novel beta-secretase inhibitor KMI-429 reduces amyloid beta peptide production in amyloid precursor protein transgenic and wild-type mice.
Alzheimer's disease (AD) is a neurodegenerative disorder characterized by the accumulation of amyloid plaques and neurofibrillary tangles in the brain. The major component of the plaques, amyloid beta peptide (Abeta), is generated from amyloid precursor protein (APP) by beta- and gamma-secretase-mediated cleavage. Because beta-secretase/beta-site APP cleaving enzyme 1 (BACE1) knockout mice produce much less Abeta and grow normally, a beta-secretase inhibitor is thought to be one of the most attractive targets for the development of therapeutic interventions for AD without apparent side-effects. Here, we report the in vivo inhibitory effects of a novel beta-secretase inhibitor, KMI-429, a transition-state mimic, which effectively inhibits beta-secretase activity in cultured cells in a dose-dependent manner. We injected KMI-429 into the hippocampus of APP transgenic mice. KMI-429 significantly reduced Abeta production in vivo in the soluble fraction compared with vehicle, but the level of Abeta in the insoluble fraction was unaffected. In contrast, an intrahippocampal injection of KMI-429 in wild-type mice remarkably reduced Abeta production in both the soluble and insoluble fractions. Our results indicate that the beta-secretase inhibitor KMI-429 is a promising candidate for the treatment of AD.
Asai
Masashi
M
Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan.
Hattori
Chinatsu
C
Iwata
Nobuhisa
N
Saido
Takaomi C
TC
Sasagawa
Noboru
N
Szabó
Beáta
B
Hashimoto
Yasuhiro
Y
Maruyama
Kei
K
Tanuma
Sei-ichi
S
Kiso
Yoshiaki
Y
Ishiura
Shoichi
S
D053829:Amyloid Precursor Protein Secretases; D016229:Amyloid beta-Peptides / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D016564:Amyloid beta-Protein Precursor / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D016282:Aspartic Acid Endopeptidases; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D010450:Endopeptidases / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000494:pharmacology*; D006624:Hippocampus / Q000378:metabolism; D006801:Humans; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D008822:Mice, Transgenic; D009842:Oligopeptides / Q000008:administration & dosage / Q000494:pharmacology*
D016229:Amyloid beta-Peptides; D016564:Amyloid beta-Protein Precursor; D004791:Enzyme Inhibitors; C500030:KMI-429; D009842:Oligopeptides; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human; C509282:Bace1 protein, mouse