Acetyl-boswellic acids are novel catalytic inhibitors of human topoisomerases I and IIα

被引:166
作者
Syrovets, T
Büchele, B
Gedig, E
Slupsky, JR
Simmet, T
机构
[1] Univ Ulm, Dept Pharmacol Nat Prod & Clin Pharmacol, D-89081 Ulm, Germany
[2] XanTec Analysensyst, Munster, Germany
关键词
D O I
10.1124/mol.58.1.71
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
Acetyl-boswellic acids (acetyl-BA) are pentacyclic triterpenes derived from the gum resin of frankincense. We have previously shown that these compounds are effective cytotoxic agents, acting through a mechanism that appears to involve the inhibition of topoisomerase activity. We have now investigated the mechanism of action of acetyl-BA and show that these compounds are more potent inhibitors of human topoisomerases I and II a than camptothecin, and amsacrine or etoposide, respectively. Our data demonstrate that acetyl-BA and, to a lesser extent, some other pentacyclic triterpenes, such as betulinic acid, ursolic acid, and oleanolic acid, inhibit topoisomer-ases I and II alpha through a mechanism that does not involve stabilization of the cleavable complex or the intercalation of DNA. Surface plasmon resonance analysis revealed that topoisomerases I and II alpha bind directly to an immobilized derivative of acetyl-BA. This acetyl-BA derivative interacts with human topoisomerases through high-affinity binding sites yielding KD values of 70.6 nM for topoisomerase I and 7.6 nM for topoisomerase II alpha. Based on our data, we propose that acetyl-BA inhibit topoisomerases I and II alpha through competition with DNA for binding to the enzyme. Thus, acetyl-BA are a unique class of dual catalytic inhibitors of human topoisomerases I and II alpha.
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页码:71 / 81
页数:11
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