β-Secretase (BACE1)-inhibiting C-methylrotenoids from Abronia nana suspension cultures
- Bioorg Med Chem Lett. 2014 Jul 1;24(13):2945-8. doi: 10.1016/j.bmcl.2014.04.060.
- 1. Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, Daehak-ro 80, Sankyuk-dong, Daegu 702-701, Republic of Korea.
- 2. Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, Daehak-ro 80, Sankyuk-dong, Daegu 702-701, Republic of Korea. Electronic address: [email protected].
Suspension cultures of Abronia nana were established to produce C-methylisoflavones. A new C-methylrotenoid, named abronione A (2), was isolated along with three known rotenoids, boeravinone D (1), boeravinone A methyl ether (3), and mirabijalone D (4). The IC50 values of compounds 1, 2, and 4 on β-secretase (BACE1) were 4.77, 62.21, and 4.24 μM, respectively, whereas 3 was inactive. At concentrations up to 1.0 mM, the compounds did not inhibit Other proteases such as trypsin, chymotrypsin, and Elastase, indicating that they were specific inhibitors of β-secretase. Compounds 1 and 4 were non-competitive inhibitors based on the Dixon plot and with Ki values of 5.01 and 4.28 μM, respectively. At 50 μM, compound 4 inhibited Aβ1-42 production by 43.7% in APPSW-N2a cells.