A series of thioureas were synthesized as inhibitors of NO production in lipopolysaccharide-activated macrophages. We investigated the effect of lipophilic moiety and N-substituents of the thioureas on the activity. Phenoxazine and carbazole-containing derivatives revealed higher activity than indole-containing thioureas. The appropriate spacer between lipophilic tail and thiourea head and methyl substituent at N3 position of thiourea brought beneficial effect on the inhibition of NO production. Among prepared compounds, phenoxazine-containing derivative 2a was the most potent with $2.32 \mu}M$ of $IC_50}$ value. RT-PCR analysis suggested that the prepared thioureas inhibited NO production through the suppression of iNOS mRNA expression.
合成了一系列的
硫脲作为脂
多糖激活的巨噬细胞中NO产生的
抑制剂。我们研究了
硫脲的亲脂基团和N取代基对活性的影响。含有苯氧
噻嗪和
咔唑的衍
生物表现出比含有
吲哚的
硫脲更高的活性。亲脂尾和
硫脲头之间适当的间隔,以及在
硫脲的N3位置上的甲基取代基对NO产生的抑制效果有利。 在所制备的化合物中,含有苯氧
噻嗪的衍
生物2a是最有效的,其< TEX>$IC_50}$值为< TEX>$2.32 \mu}M$。RT-PCR分析表明,所制备的
硫脲通过抑制iNOS mRNA表达来抑制NO的产生。