The extracts of Ficuscarica L. and Psoralen corylifolia L. are traditional Uygur medicines for the treatment of vitiligo, and its active ingredients furocoumarins, were are found to be the most effective agents against this skin disorder nowadays. Therefore, a series of novel easter derivatives (8a–8p) of furocoumarin were designed and synthesized based on our previous research to improve this activity in the present study. The synthesized derivatives were biologically evaluated for melanin synthesis in murine B16 cells and the SAR (structure-activity relationship) was summarized. Eight derivatives were more potent than positive control (8-MOP, 8-methoxypsoralan), especially compounds 8n (200%) and 8o (197%), which were nearly 1.5-fold potency when compared with 8-MOP (136%). Furthermore, the signaling pathway by which 8n activates the melanin biosynthesis was defined. Our results showed that it not only elevated the melanin content, but also stimulated the activity of tyrosinasein a concentration-dependent manner. Increasing of phosphorylation of Akt (also named PKB, protein kinase B) and non-activated GSK3β (glycogen synthase kinase 3 beta), which inhibited the degradation of β-catenin were observed through Western blot analysis. The accumulation of β-catenin probably led to the activation of transcription of MITF (microphthalmia-associated transcription factor) and TYR (tyrosinase) family, as well as the subsequent induction of melanin synthesis.
白玉盘
提取物和
补骨脂素是小叶白蜡树的传统维吾尔药材,用于治疗白癜风,其活性成分
呋喃香豆素被发现是目前对该皮肤病最有效的药物。因此,根据我们以前的研究,设计并合成了一系列新的
呋喃香豆素衍
生物(8a-8p)以改善这种活性。合成的衍
生物在鼠B16细胞中对
黑色素合成的
生物学评价和
SAR(结构-活性关系)进行了总结。八种衍
生物比阳性对照(8-MOP,
8-甲氧基补骨脂素)更有效,特别是化合物8n(200%)和8o(197%),其效力几乎是8-MOP(136%)的1.5倍。此外,8n激活
黑色素生物合成的信号途径被确定。我们的结果表明,它不仅提高了
黑色素含量,而且刺激了
酪氨酸酶的活性,呈浓度依赖性。通过Westernblot分析观察到
磷酸化Akt(也称为PKB,蛋白激酶B)和非激活GSK3β(
糖原合酶激酶3β)的增加,抑制了β-catenin的降解。β-catenin的积累可能导致
MITF(小眼相关转录因子)和TYR(
酪氨酸酶)家族的转录激活,以及随后诱导
黑色素合成。