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The present study evaluated the activities of sixteen NQs derivatives on\n                      <jats:italic>Trypanosoma cruzi<\/jats:italic>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Fourteen NQs displayed higher activity against bloodstream trypomastigotes of\n                      <jats:italic>T. cruzi<\/jats:italic>\n                      than benznidazole. Further assays with NQ1, NQ8, NQ9 and NQ12 showed inhibition of the proliferation of axenic epimastigotes and intracelulluar amastigotes interiorized in macrophages and in heart muscle cells. NQ8 was the most active NQ against both proliferative forms of\n                      <jats:italic>T. cruzi<\/jats:italic>\n                      . In epimastigotes the four NQs induced mitochondrial swelling, vacuolization, and flagellar blebbing. The treatment with NQs also induced the appearance of large endoplasmic reticulum profiles surrounding different cellular structures and of myelin-like membranous contours, morphological characteristics of an autophagic process. At IC\n                      <jats:sub>50<\/jats:sub>\n                      concentration, NQ8 totally disrupted the \u0394\u03a8m of about 20% of the parasites, suggesting the induction of a sub-population with metabolically inactive mitochondria. On the other hand, NQ1, NQ9 or NQ12 led only to a discrete decrease of TMRE + labeling at IC\n                      <jats:sub>50<\/jats:sub>\n                      values. NQ8 led also to an increase in the percentage of parasites labeled with DHE, indicative of ROS production, possibly the cause of the observed mitochondrial swelling. The other three NQs behaved similarly to untreated controls.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      NQ1, NQ8, NQ9 and NQ12 induce an autophagic phenotype in\n                      <jats:italic>T. cruzi<\/jats:italic>\n                      epimastigoted, as already observed with others NQs. The absence of oxidative stress in NQ1-, NQ9- and NQ12-treated parasites could be due to the existence of more than one mechanism of action involved in their trypanocidal activity, leaving ROS generation suppressed by the detoxification system of the parasite. The strong redox effect of NQ8 could be associated to the presence of the acetyl group in its structure facilitating quinone reduction, as previously demonstrated by electrochemical analysis. Further experiments using biochemical and molecular approaches are needed to better characterize ROS participation in the mechanism of action of these NQs.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/1471-2180-13-196","type":"journal-article","created":{"date-parts":[[2013,9,3]],"date-time":"2013-09-03T02:16:38Z","timestamp":1378174598000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":47,"title":["Trypanosoma cruzi mitochondrial swelling and membrane potential collapse as primary evidence of the mode of action of naphthoquinone analogues"],"prefix":"10.1186","volume":"13","author":[{"given":"Kelly","family":"Salom\u00e3o","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia A","family":"De Santana","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria Teresa","family":"Molina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Solange L","family":"De Castro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rubem F S","family":"Menna-Barreto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2013,9,3]]},"reference":[{"key":"2081_CR1","doi-asserted-by":"publisher","first-page":"727","DOI":"10.1586\/14787210.5.4.727","volume":"5","author":"MO Rocha","year":"2007","unstructured":"Rocha MO, Teixeira MM, Ribeiro AL: An update on the management of Chagas\u2019 cardiomyopathy. 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