Ribeiro Schalcher, Taysa, Borges, Rosivaldo S., Coleman, Michael D., Júnior, João Batista, Salgado, Claudio G., Vieira, Jose Luiz F., Romão, Pedro R.T., Oliveira, Fabio R. and Chagas Monteiro, Marta (2014). Clinical oxidative stress during leprosy multidrug therapy:impact of dapsone oxidation. PLoS ONE, 9 (1),
Abstract
This study aims to assess the oxidative stress in leprosy patients under multidrug therapy (MDT; dapsone, clofazimine and rifampicin), evaluating the nitric oxide (NO) concentration, catalase (CAT) and superoxide dismutase (SOD) activities, glutathione (GSH) levels, total antioxidant capacity, lipid peroxidation, and methemoglobin formation. For this, we analyzed 23 leprosy patients and 20 healthy individuals from the Amazon region, Brazil, aged between 20 and 45 years. Blood sampling enabled the evaluation of leprosy patients prior to starting multidrug therapy (called MDT 0) and until the third month of multidrug therapy (MDT 3). With regard to dapsone (DDS) plasma levels, we showed that there was no statistical difference in drug plasma levels between multibacillary (0.518±0.029 μg/mL) and paucibacillary (0.662±0.123 μg/mL) patients. The methemoglobin levels and numbers of Heinz bodies were significantly enhanced after the third MDTsupervised dose, but this treatment did not significantly change the lipid peroxidation and NO levels in these leprosy patients. In addition, CAT activity was significantly reduced in MDT-treated leprosy patients, while GSH content was increased in these patients. However, SOD and Trolox equivalent antioxidant capacity levels were similar in patients with and without treatment. These data suggest that MDT can reduce the activity of some antioxidant enzyme and influence ROS accumulation, which may induce hematological changes, such as methemoglobinemia in patients with leprosy. We also explored some redox mechanisms associated with DDS and its main oxidative metabolite DDS-NHOH and we explored the possible binding of DDS to the active site of CYP2C19 with the aid of molecular modeling software.
Publication DOI: | https://doi.org/10.1371/journal.pone.0085712 |
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Divisions: | College of Health & Life Sciences > Aston Pharmacy School College of Health & Life Sciences College of Health & Life Sciences > Chronic and Communicable Conditions College of Health & Life Sciences > School of Biosciences > Cellular and Molecular Biomedicine |
Additional Information: | Copyright: © 2014 Schalcher et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
Uncontrolled Keywords: | General Agricultural and Biological Sciences,General Biochemistry,Genetics and Molecular Biology,General Medicine |
Publication ISSN: | 1932-6203 |
Last Modified: | 18 Nov 2024 17:43 |
Date Deposited: | 19 Aug 2019 09:36 |
Full Text Link: |
http://journals ... al.pone.0085712 |
Related URLs: |
http://www.scop ... tnerID=8YFLogxK
(Scopus URL) |
PURE Output Type: | Article |
Published Date: | 2014-01-22 |
Authors: |
Ribeiro Schalcher, Taysa
Borges, Rosivaldo S. Coleman, Michael D. ( 0000-0002-5510-6852) Júnior, João Batista Salgado, Claudio G. Vieira, Jose Luiz F. Romão, Pedro R.T. Oliveira, Fabio R. Chagas Monteiro, Marta |