International Journal of Molecular Sciences (2018)
Update date:2022-08-10
Topics:
Micillo, Raffaella
Sirés-Campos, Julia
García-Borrón, José Carlos
Panzella, Lucia
Napolitano, Alessandra
Olivares, Conchi
Caffeic acid derivatives represent promising lead compounds in the search for tyrosinase inhibitors to be used in the treatment of skin local hyperpigmentation associated to an overproduction or accumulation of melanin. We recently reported the marked inhibitory activity of a conjugate of caffeic acid with dihydrolipoic acid, 2-S-lipoylcaffeic acid (LCA), on the tyrosine hydroxylase (TH) and dopa oxidase (DO) activities of mushroom tyrosinase. In the present study, we evaluated a more lipophilic derivative, 2-S-lipoyl caffeic acid methyl ester (LCAME), as an inhibitor of tyrosinase from human melanoma cells. Preliminary analysis of the effects of LCAME on mushroom tyrosinase indicated more potent inhibitory effects on either enzyme activities (IC50 = 0.05 ± 0.01 μM for DO and 0.83 ± 0.09 μM for TH) compared with LCA and the reference compound kojic acid. The inhibition of DO of human tyrosinase was effective (Ki = 34.7 ± 1.1 μM) as well, while the action on TH was weaker. Lineweaver–Burk analyses indicated a competitive inhibitor mechanism. LCAME was not substrate of tyrosinase and proved nontoxic at concentrations up to 50 μM. No alteration of basal tyrosinase expression was observed after 24 h treatment of human melanoma cells with the inhibitor, but preliminary evidence suggested LCAME might impair the induction of tyrosinase expression in cells stimulated with α-melanocyte-stimulating hormone. All these data point to this compound as a valuable candidate for further trials toward its use as a skin depigmenting agent. They also highlight the differential effects of tyrosinase inhibitors on the human and mushroom enzymes.
View MoreHuangshi Shennong Chemical Technology Co., Ltd
Contact:+86-714-3072290
Address:Eastern industrial park , Tieshan district , Huangshi city ,Hubei province , China
Contact:0086-357-6662688
Address:Zhaocheng town, Hongtong County, Linfen City, Shanxi Province
Contact:+86-021-6989-5597
Address:No.80 Yichuan Rd., Putuo District,Shanghai,P.R.China
Shanghai Synmedia Chemical Co., Ltd
Contact:+86-21-38681880
Address:6th Floor, 11A Building, No.528 Ruiqing Road, Heqing town, Pudong new district, Shanghai China
Contact:+86-0512-62857507
Address:Boji Science Park, No1688C,Taishan road, Suzhou ,China
Doi:10.1080/14786410903381335
(2010)Doi:10.1021/acs.jmedchem.9b00136
(2019)Doi:10.1039/c8tb01796d
(2018)Doi:10.1248/cpb.53.1136
(2005)Doi:10.1007/BF00904143
()Doi:10.1016/S0022-328X(99)00618-X
(2000)