1
|
Kim SJ, Yang J, Lee S, Park C, Kang D, Akter J, Ullah S, Kim YJ, Chun P, Moon HR. The tyrosinase inhibitory effects of isoxazolone derivatives with a (Z)-β-phenyl-α, β-unsaturated carbonyl scaffold. Bioorg Med Chem 2018; 26:3882-3889. [PMID: 29907470 DOI: 10.1016/j.bmc.2018.05.047] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 05/29/2018] [Accepted: 05/30/2018] [Indexed: 01/01/2023]
Abstract
Thirteen (Z)-4-(substituted benzylidene)-3-phenylisoxazol-5(4H)-ones were designed to confirm the geometric effect of the double bond of the β-phenyl-α, β-unsaturated carbonyl scaffold on tyrosinase inhibitory activity. Compounds 1a-1m, which all possessed the (Z)-β-phenyl-α, β-unsaturated carbonyl scaffold, were synthesized using a tandem reaction consisting of an isoxazolone ring formation and a Knoevenagel condensation, and three starting materials, ethyl benzoylacetate, hydroxylamine and benzaldehydes. Some of the compounds showed inhibitory activity against mushroom tyrosinase as potent as compounds containing the "(E)"-β-phenyl-α, β-unsaturated carbonyl scaffold. Compounds 1c and 1m showed greater inhibitory activity than kojic acid: IC50 = 32.08 ± 2.25 μM for 1c; IC50 = 14.62 ± 1.38 μM for 1m; and IC50 = 37.86 ± 2.21 μM for kojic acid. A kinetic study indicated that 1m inhibited tyrosinase in a competitive manner and that it probably binds to the enzyme's active site. In silico docking simulation supported binding of 1m (-7.6 kcal/mol) to the active site of tyrosinase with stronger affinity than kojic acid (-5.7 kcal/mol). Similar results were obtained using cell-based assays, and in B16F10 cells, compound 1m dose-dependently inhibited tyrosinase activity and melanogenesis. These results indicate the anti-melanogenic effect of compound 1m is due to the inhibition of tyrosinase and (Z)-isomer of the β-phenyl-α, β-unsaturated carbonyl scaffold can, like its congener the (E)-isomer, act as an excellent scaffold for tyrosinase inhibition.
Collapse
Affiliation(s)
- Su Jeong Kim
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Jungho Yang
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Sanggwon Lee
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Chaeun Park
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Dongwan Kang
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Jinia Akter
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Sultan Ullah
- College of Pharmacy, Pusan National University, Busan 46241, South Korea
| | - Yeon-Jeong Kim
- College of Pharmacy and Inje Institute of Pharmaceutical Sciences and Research, Inje University, Gimhae, Gyeongnam 50834, South Korea
| | - Pusoon Chun
- College of Pharmacy and Inje Institute of Pharmaceutical Sciences and Research, Inje University, Gimhae, Gyeongnam 50834, South Korea.
| | - Hyung Ryong Moon
- College of Pharmacy, Pusan National University, Busan 46241, South Korea.
| |
Collapse
|