In vitro activity and mechanism of action against the protozoan parasite Trypanosoma cruzi of 5-nitrofuryl containing thiosemicarbazones
摘要:
The in vitro growth inhibition activity of new thiosemicarbazone derivatives against the protozoan parasite Trypanosoma cruzi, the causative agent of American trypanosomiasis, are described. The designed compounds combine in the same molecule the thiosemicarbazone function, recently described as a potent cruzain-inhibitor moiety, and the recognised 5-nitrofuryl group, an oxidative stress promoter. Some of the derivatives were found to be very active against the cultured (epimastigote) form of the parasite, being 1.5-1.7-fold more active than the reference compound, Nifurtimox. Free radicals production was detected when the compounds were incubated in presence of mammalian-liver microsomes. The thiosemicarbazones' capacity to act as pharmacophore in the cruzain inhibition process was theoretically analysed. Frontier molecular orbital HOMO was found as an adequate descriptor in this process. Acute in vivo toxicity of two of the more active derivatives was evaluated. The results showed that these compounds are among the most potent 5-nitrofuryl derivatives tested against this parasite thus support further in vivo studies of some of these thiosemicarbazones. (C) 2004 Elsevier Ltd. All rights reserved.
Thiosemicarbazones active against Clostridium difficile
作者:Cait Costello、Tarja Karpanen、Peter A. Lambert、Preena Mistry、Katy J. Parker、Daniel L. Rathbone、Jiangmeng Ren、Laura Wheeldon、Tony Worthington
DOI:10.1016/j.bmcl.2008.01.041
日期:2008.3
A set of closely related furylidene thiosemicarbazones was prepared and screened against various clinically important Gram-positive bacteria. One compound containing an ethylene spacer and a 5-nitrofuryl group was found to have promising activity against Clostridium difficile. (C) 2008 Elsevier Ltd. All rights reserved.