Enzymatic Synthesis of Bufadienolide<i>O</i>-Glycosides as Potent Antitumor Agents Using a Microbial Glycosyltransferase
作者:Kai Li、Jin Feng、Yi Kuang、Wei Song、Meng Zhang、Shuai Ji、Xue Qiao、Min Ye
DOI:10.1002/adsc.201700777
日期:2017.11.10
significant cytotoxic activities against A549 and MCF7 human cancer cell lines, and showed potent inhibitory activities against Na+/K+‐ATPase with IC50 values in the range 0.053–0.76 μM. In particular, bufalin 3‐O‐β‐d‐glucoside showed enhanced water solubility (25‐fold increase from bufalin) and potentantitumor activities (30% inhibition rate, 1.4 mg kg−1, i.p.) on A549 human lung cancer xenograft Balb/c
丁二烯内酯是一类天然的强心类固醇,以其抗肿瘤活性而闻名。不良的水溶性阻碍了它们的临床应用。酶促糖基化是改善天然产物的溶解度的有利方法。在这项工作中,我们描述了高效的一步法合成布法地那利O-葡萄糖苷和O-半乳糖苷使用微生物糖基转移酶YjiC1,转化率从63%到99%。从14种底物中获得了总共24种糖苷,包括17种新化合物,并通过广泛的NMR和高分辨率电喷雾电离质谱(HR-ESI-MS)分析鉴定了它们的结构。这些产物属于五种类型:3β-OH,7β-OH,3β,7β-di-OH,11α-OH和12β-OH的糖基化。的C-7β或C-11α Ö bufadienolide的-glycosides报道首次。此外,3- O-糖苷对A549和MCF7人癌细胞系表现出显着的细胞毒活性,并显示出对Na + / K + -ATPase的有效抑制活性(IC 50)值在0.053-0.76μM范围内。特别是,bufalin
Microbial Hydroxylation of Bufalin by <i>Cunninghamella </i><i>b</i><i>lakesleana </i>and<i> Mucor </i><i>s</i><i>pinosus</i>
The microbial transformation of a cytotoxic bufadienolide, bufalin (1), was carried out using two strains of filamentous fungi. Cunninghamella blakesleana catalyzed the specific 12 alpha-hydroxylation of bufalin and produced 12 alpha-hydroxybufalin (2) and 7 beta,12 alpha-dihydroxybufalin (3) as the major metabolites, together with 7 beta-hydroxybufalin (4) and 12 beta-hydroxybufalin (5) in low yields. Two minor products were isolated from the culture broth of Mucor spinosus and were identified as 7 beta,15 alpha-dihydroxybufalin (6) and 5 beta,7 beta-dihydroxybufalin (7), respectively. Metabolites 2, 3, 6, and 7 are new compounds, and their structures were fully characterized by NMR and MS spectroscopy.
Modulators of Hypoxia Inducible Factor-1 and Related Uses for the Treatment of Ocular Disorders
申请人:Khodadoust Mehran
公开号:US20110076278A1
公开(公告)日:2011-03-31
Methods for treatment of ocular disorders using steroids modulate the effects of local and systemic hypoxic events mediated by hypoxia inducible factor-1 (HIF-1). Steroids that are useful as HIF-1 modulators include bufalin, digitoxigenin, digoxin, lanatoside C, strophantin K, uzarigenin, ouabain and proscillaridin. In some embodiments the ocular disorder is characterized by ischmia.
Umwandlung von Kr�tengiften (Bufadienoliden) durch Mikroorganismen: I. 12?-Hydroxylierung von Bufalin5. Mitteilung �ber Reaktionen mit Mikroorganismen
作者:Ch. Tamm、Alice Gubler
DOI:10.1002/hlca.19590420212
日期:——
Bufalin (111) wurde durch 12β-Hydroxylierung mit Kulturen vonFusarium lini (BOLLEY) in 12β-Hydroxybufalin (5) übergeführt, dessen Konstitution durch Abbau zum bekannten 3β,12βDiacetoxy-14-hydroxy-5β,14β-ätiansäure-methylester (VII)bewiesen wurde. 3-Dehydro-bufalin (= Bufalon) (VIII) lieferte beim Umsatz rnitF. lini3-Dehydro-12β-hydroxy-bufalin (IX) sowie ein Mischkristallisat von 2 weite-ren, nicht