donor hybrids were designed, synthesized and evaluated in vitro against triple negative breast cancer (MDA-MB-231), hepatocellular (HepG2) and lung (A549) carcinoma cells. Most furoxan-based plumbagin derivatives exhibited significantly superior potency compared to their parent compound. Noticeably, MDA-MB-231 cells are the most sensitive to these furoxan-based plumbagin derivatives as evidenced by IC50
pro-apoptotic signals in cancerous cells. In this study, we conjugated diazeniumdiolates (NONOates), an important class of NO donors, with a natural occurring plumbagin (PL) which is primarily an excellent ROS inducer. Herein, a total of 12 novel plumbagin/NONOate hybrids have been synthesized and evaluated for their inhibitory effects on a panel of human cancer cell lines (MDA-MB-231, A549, HepG2 and HCT-116 cells)
Conjugates of plumbagin and phenyl-2-amino-1-thioglucoside inhibit MshB, a deacetylase involved in the biosynthesis of mycothiol
作者:David W. Gammon、Daniel J. Steenkamp、Vuyo Mavumengwana、Mohlopheni J. Marakalala、Theophilus T. Mudzunga、Roger Hunter、Muganza Munyololo
DOI:10.1016/j.bmc.2010.02.049
日期:2010.4
N-Acetylglucosaminylinositol (GlcNAc-Ins)-deacetylase (MshB) and mycothiol-S-conjugate amidase (Mca), structurally related amidases present in mycobacteria and other Actinomycetes, are involved in the biosynthesis of mycothiol and in the detoxification of xenobiotics as their mycothiol-S-conjugates, respectively. With substrate analogs of GlcNAc-Ins, MshB showed a marked preference for inositol as the aglycon present in GlcNAc-Ins. The inhibition of MshB and Mca by 10 thioglycosides, 7 cyclohexyl-2-deoxy-2-C-alkylglucosides, and 4 redox cyclers was evaluated. The latter contained plumbagin tethered via 2 to 5 methylene carbons and an amide linkage to phenyl-2-deoxy-2-amino-1-thio-alpha-D-glucopyranoside. These proved to be the most potent amongst the 21 compounds tested as inhibitors of MshB. Their inhibitory potency varied with the length of the spacer, with the compound with longest spacer being the most effective. (C) 2010 Elsevier Ltd. All rights reserved.
2- and 3-Substituted 1,4-Naphthoquinone Derivatives as Subversive Substrates of Trypanothione Reductase and Lipoamide Dehydrogenase from <i>Trypanosoma</i> <i>c</i><i>ruzi</i>: Synthesis and Correlation between Redox Cycling Activities and in Vitro Cytotoxicity
Trypanothionereductase (TR) is both a valid and an attractive target for the design of new trypanocidal drugs. Starting from menadione, plumbagin, and juglone, three distinct series of 1,4-naphthoquinones (NQ) were synthesized as potential inhibitors of TR from Trypanosoma cruzi (TcTR). The three parent molecules were functionalized at carbons 2 and/or 3 by various polyamine chains. Optimization of