Synthesis and Structure−Activity Relationship Study of Potent Trypanocidal Thio Semicarbazone Inhibitors of the Trypanosomal Cysteine Protease Cruzain
作者:Xiaohui Du、Chun Guo、Elizabeth Hansell、Patricia S. Doyle、Conor R. Caffrey、Tod P. Holler、James H. McKerrow、Fred E. Cohen
DOI:10.1021/jm010459j
日期:2002.6.1
American trypanosomiasis, or Chagas' disease, is the leading cause of heart disease in Latin America. Currently there is an urgent need to develop antitrypanosomal therapy due to the toxicity of existing agents and emerging drug resistance. A novel series of potent thio semicarbazone small-molecule inhibitors of the Trypanosoma cruzi cysteine protease cruzain have been identified. Some of these inhibitors have been shown to be trypanocidal. We initially discovered that X-bromopropiophenone thio semicarbazone (1i) inhibited cruzain and could cure mammalian cell cultures infected with T cruzi. 3'-Bromopropiophenone thio semicarbazone showed no toxicity for mammalian cells at concentrations that were trypanocidal. Following this lead, more than 100 compounds were designed and synthesized. A specific structure-activity relationship (SAR) was established, and many potent analogues with IC50 values in the low nanomolar range were identified. Eight additional analogues were trypanocidal in a cell culture assay, and this indicates that aryl thio semicarbazone is a productive scaffold for killing the parasites. Kinetic studies show that these are time-dependent inhibitors. Molecular modeling studies of the enzyme-inhibitor complex have led to a proposed mechanism of interaction as well as insight into the SAR of the thio semicarbazone series. The nonpeptide nature of this series, small size, and extremely low cost of production suggest this is a promising direction for the development of new antitrypanosome chemotherapy.
New 1,3-thiazole derivatives and their biological and ultrastructural effects on Trypanosoma cruzi
作者:Paulo André Teixeira de Moraes Gomes、Miria de Oliveira Barbosa、Edna Farias Santiago、Marcos Veríssimo de Oliveira Cardoso、Natáli Tereza Capistrano Costa、Marcelo Zaldini Hernandes、Diogo Rodrigo Magalhães Moreira、Aline Caroline da Silva、Thiago André Ramos dos Santos、Valéria Rêgo Alves Pereira、Fábio André Brayner dos Santosd、Glaécia Aparecida do Nascimento Pereira、Rafaela Salgado Ferreira、Ana Cristina Lima Leite
DOI:10.1016/j.ejmech.2016.05.050
日期:2016.10
previous studies, the compound 3-(bromopropiophenone) thiosemicarbazone was described as a potent anti-Trypanosoma cruzi and cruzain inhibitor. In view to optimize this activity, 1,3-thiazole core was used as building-block strategy to access new lead generation of anti T. cruziagents. In this way a series of thiazole derivatives were synthesized and most of these derivatives exhibited antiparasitic