Novel NO-releasing derivatives of betulinic acid with antitumor activity

Thirteen novel NO-releasing derivatives of betulinic acid （BA） bearing two types of NO-donors （nitrates and furoxans） were synthesized and evaluated for their antitumor activity. The results showed that furoxan-based derivatives exhibited higher antitumor activity than nitrate-based derivatives, with compounds lla and llb displaying promising potency against B16 cell lines and HepG2 cell lines （IC50 〈 1 μmol/L）. We supposed that NO-releasing amount of these derivatives which can be detected by Griess method may contribute more to their antitumor activity. As a result, furoxan-based derivatives released larger amount of NO than that of nitrate-based derivatives, which partially explained the higher anti-tumor activity of the former.

一氧化氮供体型氟罗布芬衍生物的合成及抗炎活性

目的获得抗炎活性强、胃肠道不良反应小的新型非甾体抗炎药 (NSAIDs)。方法将具有不同释放机制的一氧化氮 (NO)供体 ,包括NO合酶 (NOS)底物类似物、硝酸酯和呋咱氮氧化物通过酯键与正在Ⅲ期临床研究的NSAID氟罗布芬 (1 )相偶联 ,测定偶联物的抗炎活性 ,考察其胃肠道毒副作用 ,研究其释放NO的作用。结果合成 1 9个未见文献报道的新化合物 ,结构经MS、IR、1H NMR和元素分析确证。初步药理筛选结果表明 :1 0个目标物 (Ⅰ1、Ⅰ3～ 5、Ⅰ8、Ⅰ12 、Ⅱ2 ,3 、Ⅱ6,7)显示了较高的抗炎活性 ,其中 5个 (Ⅰ1、Ⅰ3 ,4、Ⅱ3 、Ⅱ6)活性与氟罗布芬相当 (P >0 0 5 ) ;所有活性化合物均表现出较小的胃肠道不良反应 ,其中Ⅰ1、Ⅰ3 、Ⅰ5、Ⅱ7的不良反应显著小于氟罗布芬 (P <0 0 5 )。结论Ⅰ1和Ⅰ3 的综合指标优于氟罗布芬 ,值得深入研究。