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Molecules 2013, 18(1), 140-153; doi:10.3390/molecules18010140
Article

Inhibitory Evaluation of Sulfonamide Chalcones on β-Secretase and Acylcholinesterase

1,†, 1,†, 2, 1, 3, 1, 1, 1 and 1,*
1 Division of Applied Life Science (BK21 Program), IALS, Gyeongsang National University, Jinju 660-701, Korea 2 Graduate Program in Biochemistry and Biophysics, Brandeis University, 415 South Street, Waltham, MA 02453, USA 3 Chemical Safety Division, National Academy of Agricultural Sciences, RDA, Suwon 441-701, Korea These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 19 November 2012 / Revised: 16 December 2012 / Accepted: 18 December 2012 / Published: 21 December 2012
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Abstract

The action of β-secretase (BACE1) is strongly correlated with the onset of Alzheimer’s disease (AD). Aminochalcone derivatives were examined for their ability to inhibit BACE1. Parent aminochalcones showed two digit micromolar IC50s against BACE1. Potency was enhanced 10-fold or more by introducing benzenesulfonyl derivatives to the amino group: 1 (IC50 = 48.2 μM) versus 4a (IC50 = 1.44 μM) and 2 (IC50 = 17.7 μM) versus 5a (IC50 = 0.21 μM). The activity was significantly influenced by position and number of hydroxyl groups on the chalcone B-ring: 3,4-dihydroxy 5a (IC50 = 0.21 μM) > 4-hydroxy 4a (IC50 = 1.44 μM) > 2,4-dihydroxy 6 (IC50 = 3.60 μM) > 2,5-dihydroxy 7 (IC50 = 16.87 μM) > des hydroxy 4b (IC50 = 168.7 μM). Lineweaver-Burk and Dixon plots and their secondary replots indicate that compound 5a was a mixed inhibitor with reversible and time-dependent behavior. Potent BACE1 inhibitors 4a,c,f, 5ac showed moderate inhibition against two other enzymes implicated in AD pathogenesis, acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), with IC50s ranging between 56.1 ~ 95.8 μM and 19.5 ~ 79.0 μM, respectively.
Keywords: sulfonamide chalcone; Alzheimer’s disease (AD); β-secretase; acetylcholinesterase (AChE); butyrylcholinesterase (BChE); mixed inhibition sulfonamide chalcone; Alzheimer’s disease (AD); β-secretase; acetylcholinesterase (AChE); butyrylcholinesterase (BChE); mixed inhibition
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kang, J.E.; Cho, J.K.; Curtis-Long, M.J.; Ryu, H.W.; Kim, J.H.; Kim, H.J.; Yuk, H.J.; Kim, D.W.; Park, K.H. Inhibitory Evaluation of Sulfonamide Chalcones on β-Secretase and Acylcholinesterase. Molecules 2013, 18, 140-153.

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