A series of methyl ester of clovamide analogues, where the hydroxyl group of catechol moiety in caffeic acid and L-3,4-dihydroxyphenylalanine (L-dopa) was replaced with various functional groups, were synthesized and their inhibitory effects on nitric oxide (NO) production and inducible NO synthase (iNOS) expression in lipopolysaccharide (LPS)-induced BV2 cells were tested. Among the synthesized compounds, 3,5-ditrifluoromethyl analogue 9l (IC50=2.8 µM) exhibited a potency about 26.3 times greater than that of the parent compound 9a (IC50=73.6 µM) and suppressed NO production dose-dependently without cytotoxicity. Compound 9l also inhibited iNOS expression in LPS-induced BV2 cells at 2.5, 5 and 10 µM concentrations. These results suggested that the dihydroxyl group of catechol moiety in caffeic acid unit is not essential for the suppression of NO production and that 9l has potential as a potent inhibitor of NO production.
研究人员合成了一系列
氯伐酰胺甲
酯类似物,用不同的官能团取代了
咖啡酸和 L-3,4-二羟基苯丙
氨酸(
L-多巴)中
儿茶酚分子的羟基,并测试了它们对脂
多糖(LPS)诱导的 BV2 细胞中
一氧化氮(NO)产生和诱导型 NO 合酶(iNOS)表达的抑制作用。在合成的化合物中,3,5-二三
氟甲基类似物 9l(IC50=2.8 µM)的效力约为母体化合物 9a(IC50=73.6 µM)的 26.3 倍,并能剂量依赖性地抑制
一氧化氮的产生,且无细胞毒性。在 2.5、5 和 10 µM 浓度下,化合物 9l 还能抑制 LPS 诱导的 BV2 细胞中 iNOS 的表达。这些结果表明,
咖啡酸单位中
儿茶酚分子的二羟基对于抑制 NO 的产生并不是必不可少的,9l 有潜力成为一种有效的 NO 生成
抑制剂。