Identification of Indoline-2-thione Analogs as Novel Potent Inhibitors of .ALPHA.-Melanocyte Stimulating Hormone Induced Melanogenesis
作者:Pillaiyar Thanigaimalai、Ki-Cheul Lee、Vinay Kumar Sharma、Niti Sharma、Eunmiri Roh、Youngsoo Kim、Sang-Hun Jung
DOI:10.1248/cpb.59.1285
日期:——
Based on the hits, 3,4-dihydroquinazoline-2-thione (1) and benzimidazole-2-thione (2), a series of indole-2-thione (3) and indole-2-thiol inhibitors (4) of melanogenesis were designed, synthesized and evaluated in melanoma B16 cells under the stimulant of α-melanocyte stimulating hormone (α-MSH). The indole-2-thione compounds (3a—g) exhibited an effective inhibitory activity on melanin synthesis. The Structure–Activity Relationship (SAR) studies of 2 have revealed that in potent inhibitor 3a (>100% inhibition at 30 μM, IC50=1.40 μM) the role of nitrogen (3-N) at 3-position is insignificance. In addition, the hydrophobic substituents of 3 were better than the hydrophilic one. However, conversion of thione (–C=S, 3) to thiol (–C–SH, 4) led to decrease in the potency.
在3,4-二氢喹唑啉-2-硫酮(1)和苯并咪唑-2-硫酮(2)的基础上,设计、合成了一系列吲哚-2-硫酮(3)和吲哚-2-硫醇黑色素生成抑制剂(4),并在α-黑色素细胞刺激素(α-MSH)的刺激下对黑色素瘤B16细胞进行了评估。吲哚-2-硫酮化合物(3a-g)对黑色素合成具有有效的抑制活性。对 2 的结构-活性关系(SAR)研究发现,在强效抑制剂 3a 中(30 μM时抑制率大于 100%,IC50=1.40 μM),3-位上的氮(3-N)的作用微不足道。此外,3 的疏水取代基比亲水取代基更好。然而,将硫酮(-C=S,3)转化为硫醇(-C-SH,4)会导致药效降低。