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Inst. Oswaldo Cruz"],"abstract":"<jats:p> BACKGROUND  Chagas disease (CD) is a neglected tropical disease caused by Trypanosoma cruzi. The current drugs used to treat these diseases have limited efficacy and produce severe side effects. 4-aminoquinoline derivatives were shown to be a promising class of inhibitors of cysteine proteases cruzain and TbrCATL.  OBJECTIVES  To evaluate the trypanocidal activity of a new series of aminoquinolines as potential inhibitors of cruzain and TbrCATL.  METHODS  Three aminoquinolines were synthesised and their in vitro activity was evaluated against cruzain and TbrCATL as well as against amastigotes and trypomastigotes forms of T. cruzi. In silico studies were also carried out to try to understand the experimental results.  FINDINGS  Compound 5 showed promising activity against cruzain and TbrCATL, with better performance than E60, the reference drug. Compound 5 inhibited cruzain and TbrCATL at IC50 of 23 \u00b5M \u00b13 and 29 \u00b5M \u00b11, respectively, but this inhibition showed characteristics of promiscuous inhibition by colloidal aggregation. On the other hand, the compound 4 showed to be more promising activity against T. cruzi with IC50 2.57 \u00b5M \u00b1 0.03 lower than the reference drug benznidazole 3.8 \u00b5M.  MAIN CONCLUSIONS The results of this study can guide new drug development for the treatment of trypanosomiasis.<\/jats:p>","DOI":"10.1590\/0074-02760240161","type":"journal-article","created":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T11:30:56Z","timestamp":1740051056000},"source":"Crossref","is-referenced-by-count":2,"title":["Investigation of the activity of 4-aminoquinolines as cysteine protease inhibitors with application in the treatment of Chagas disease"],"prefix":"10.1590","volume":"120","author":[{"given":"Rahamah","family":"Sheu-Idrees","sequence":"first","affiliation":[{"name":"Universidade Federal de Minas Gerais,  Brazil; Kampala International University,  Uganda; Kampala International University,  Tanzania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel Vitor de Lima","family":"Marques","sequence":"additional","affiliation":[{"name":"Universidade Federal de Minas Gerais,  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