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de Araújo Neto LN, de Lima MDCA, de Oliveira JF, de Souza ER, Feitosa Machado SE, de Souza Lima GM, Silva Buonafina MD, Brayner FA, Alves LC, Sandes JM, da Silva MV, de Castro MCAB, Pereira Neves R, Bezerra Mendonça-Junior FJ. Thiophene-thiosemicarbazone derivative (L10) exerts antifungal activity mediated by oxidative stress and apoptosis in C. albicans. Chem Biol Interact 2020; 320:109028. [PMID: 32119865 DOI: 10.1016/j.cbi.2020.109028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 02/23/2020] [Accepted: 02/25/2020] [Indexed: 11/26/2022]
Abstract
Reactive oxygen species (ROS) cause cell damage and death. To reverse these effects, cells produce substances such as reduced glutathione (GSH) that serve as substrates for antioxidant enzymes. One way to combat microbial resistance includes nullifying the effect of glutathione in microbial cells, causing them to die from oxidative stress. The compound 2-((5-nitrothiophen-2-yl)methylene)-N-(pyridin-3-yl) hydrazine carbothioamide (L10) is a new thiophene-thiosemicarbazone derivative with promising antifungal activity. The aim of this study was to evaluate its mechanism of action against Candida albicans using assays that evaluate its effects on redox balance. Treatment with L10 promoted significant changes in the minimum inhibitory concentration (MIC) values in ascorbic acid and GSH protection tests, the latter increasing up to 64-fold of the MIC. Using nuclear magnetic resonance, we demonstrated interaction of L10 and GSH. At concentrations of 4.0 and 8.0 μg/mL, significant changes were observed in ROS production and mitochondrial membrane potential. The cell death profile showed characteristics of initial apoptosis at inhibitory concentrations (4.0 μg/mL). Transmission electron microscopy data corroborated these results and indicated signs of apoptosis, damage to plasma and nuclear membranes, and to mitochondria. Taken together, these results suggest a possible mechanism of action for L10 antifungal activity, involving changes in cellular redox balance, ROS production, and apoptosis-compatible cellular changes.
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Affiliation(s)
- Luiz Nascimento de Araújo Neto
- Medical Mycology Laboratory, Federal University of Pernambuco, 50670-901, Brazil; Chemistry Laboratory and Therapeutic Innovation, Federal University of Pernambuco, 50670-901, Brazil
| | | | | | - Edson Rubhens de Souza
- Chemistry Laboratory and Therapeutic Innovation, Federal University of Pernambuco, 50670-901, Brazil
| | | | | | | | - Fábio André Brayner
- Aggeu Magalhães Institute- IAM/FIOCRUZ and Imunopatology Keizo Asami Laboratory-LIKA/ Federal University of Pernambuco, 50670-901, Brazil
| | - Luiz Carlos Alves
- Aggeu Magalhães Institute- IAM/FIOCRUZ and Imunopatology Keizo Asami Laboratory-LIKA/ Federal University of Pernambuco, 50670-901, Brazil
| | - Jana Messias Sandes
- Aggeu Magalhães Institute- IAM/FIOCRUZ and Imunopatology Keizo Asami Laboratory-LIKA/ Federal University of Pernambuco, 50670-901, Brazil
| | | | - Maria Carolina Accioly Brelaz de Castro
- Laboratory of Immunology IAM/ FIOCRUZ, Federal University of Pernambuco, 50670-901, Brazil; Laboratory of Parasitology, Academic Center of Vitória - Federal University of Pernambuco, 55608-680, Brazil
| | - Rejane Pereira Neves
- Medical Mycology Laboratory, Federal University of Pernambuco, 50670-901, Brazil.
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