Synthesis and Anti-HIV Activity of 3-Alkylamido-3-deoxy-betulinic Acid Derivatives.
作者:Yoshiki KASHIWADA、Junko CHIYO、Yasumasa IKESHIRO、Tsuneatsu NAGAO、Hikaru OKABE、L. Mark COSENTINO、Keith FOWKE、Susan L. MORRIS-NATSCHKE、Kuo-Hsiung LEE
DOI:10.1248/cpb.48.1387
日期:——
3-Alkylamido-3-deoxy-betulinic acids were synthesized and evaluated for anti-HIVactivity as part of the structure-activity relationship study of the potent anti-HIV agent 3-O-(3',3'-dimethyl)-succinyl-betulinic acid (DSB) (2). 3Alpha-diglycorylamide-3-deoxy-betulinic acid demonstrated relatively potent anti-HIVactivity (EC50 0.24 microm, TI 728). However, replacing the ester group at C-3 in 2 and
Synthesis and cytotoxic activity of 3-O-acyl/3-hydrazine /2-bromo/20,29-dibromo betulinic acid derivatives
作者:Rama Mukherjee、Manu Jaggi、Mohammad J.A Siddiqui、Sanjay K Srivastava、Praveen Rajendran、Anand Vardhan、Anand C Burman
DOI:10.1016/j.bmcl.2004.05.034
日期:2004.8
A series of 3-O-acyl, 3-hydrazine, 2-bromo, and 20,29-dibromo betulinic acid derivatives (1-27) have been synthesized and screened for in vitro cytotoxic activity on human cancer cell lines MOLT-4, JurkatE6.1, CEM.CM3, BRISTOL8, U937, DU145, PA-1 A549, and L132. A number of compounds have shown ED50 < 1 mug/mL against the cancer cell lines tested and have shown better cytotoxicity than betulinic acid. Compounds 13, 19, 20, 23, and 27 were the best derivatives and were selected as lead molecules for further development. The structure-activity relationship has been described. (C) 2004 Elsevier Ltd. All rights reserved.
Identification and characterization of small molecule inhibitors of the ubiquitin ligases Siah1/2 in melanoma and prostate cancer cells
作者:Yongmei Feng、E. Hampton Sessions、Fan Zhang、Fuqiang Ban、Veronica Placencio-Hickok、Chen-Ting Ma、Fu-Yue Zeng、Ian Pass、David B. Terry、Gregory Cadwell、Laurie A. Bankston、Robert C. Liddington、Thomas D.Y. Chung、Anthony B. Pinkerton、Eduard Sergienko、Martin Gleave、Neil A. Bhowmick、Michael R. Jackson、Artem Cherkasov、Ze'ev A. Ronai
DOI:10.1016/j.canlet.2019.02.012
日期:2019.5
Inhibition of ubiquitin ligases with small molecule remains a very challenging task, given the lack of catalytic activity of the target and the requirement of disruption of its interactions with other proteins. Siah1/2, which are E3 ubiquitin ligases, are implicated in melanoma and prostate cancer and represent high-value drug targets. We utilized three independent screening approaches in our efforts to identify small-molecule Siah1/2 inhibitors: Affinity Selection-Mass Spectrometry, a protein thermal shift-based assay and an in silico based screen. Inhibitors were assessed for their effect on viability of melanoma and prostate cancer cultures, colony formation, prolylhydroxylase-HIF1 alpha signaling, expression of selected Siah2-related transcripts, and Siah2 ubiquitin ligase activity. Several analogs were further characterized, demonstrating improved efficacy. Combination of the top hits identified in the different assays demonstrated an additive effect, pointing to complementing mechanisms that underlie each of these Siah1/2 inhibitors.
Synthesis and antileukemic activity of an ursolic acid derivative: A potential co-drug in combination with imatinib
作者:Elenilson F. da Silva、Artur S. de Vargas、Julia B. Willig、Cristiane B. de Oliveira、Aline R. Zimmer、Diogo A. Pilger、Andréia Buffon、Simone C.B. Gnoatto
DOI:10.1016/j.cbi.2021.109535
日期:2021.8
myeloid leukemia is critical. Betulinic (1) and ursolic (2) acids are natural pentacyclic triterpenes that exhibit antileukemicactivities. In this study, we evaluated the effects of pharmacomodulations at the C-3 position of the triterpene moiety of betulinic and ursolic acids on their activity against K562 leukemia cells. Six new derivatives (1a-2c) were synthesized and evaluated for pro-apoptotic and