Summary
BackgroundWe investigated the role of reactive oxygen species (ROS) in the anticancer mechanism of N-benzyl-2-nitro-1-imidazole-acetamide (BZN), a drug used in Chagas’ disease treatment. MethodsBALB/c mice, inoculated with Ehrlich ascites carcinoma (EAC), were treated with BZN or BZN + Nacylcysteine (NAC) or NAC for 9 days. Subsequently, the inhibition of tumor growth and angiogenesis as well as animal survival were evaluated. Apoptosis and the cell cycle were evaluated using fluorescence microscopy and flow cytometry, while oxidative stress was evaluated by measuring TBARS content, DNA damage, calcium influx and ROS generation and antioxidant defenses (CAT, SOD, GPx, GST and GR). Immunoblotting was used to evaluate key death and cell cycle proteins. Results BZN treatment inhibited tumor progression (79%), angiogenesis (2.8-fold) and increased animal survival (29%). Moreover, BZN increased ROS levels (42%), calcium influx (55%), TBARS contents (1.9-fold), SOD (4.4-fold), GPx (17.5-fold) and GST (3-fold) activities and GSH depletion (2.5-fold) also caused DNA fragmentation (7.6-fold), increased cleaved PARP and promoted the trapping of cells in the G1 phase, as corroborated by the reduction in cyclin A and increased CDK2 protein levels. In silico DNA and molecular dynamic simulations showed H-bonds and hydrophobic interactions that were confirmed by circular dichroism. Increased apoptosis (232%), induced by treatment with BZN, was demonstrated by apoptotic cell staining and p53 level. Conclusion The current findings indicate that BZN acts as a tumor growth inhibitor and anti-angiogenic agent by ROS overgeneration, which interact with DNA causing damage and triggering apoptosis.
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Abbreviations
- CAT:
-
Catalase
- CDK2:
-
Cyclin-dependentkinase 2
- BZN:
-
Benznidazole (N-benzyl-2-nitro-1- imidazole-acetamide)
- GPx:
-
Glutathione Peroxidase
- GROMACS:
-
Groningen Machine for Chemical Simulations
- GSH:
-
Reduced Glutathione
- GST:
-
Glutathione S-transferase
- NAC:
-
N-Acetyl-L-cysteine
- PARP:
-
Poly (ADP-ribose) polymerase
- ROS:
-
Reactive Oxygen Species
- SOD:
-
Superoxide Dismutase
- TBARS:
-
Thiobarbituric Acid Reactive Substances
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Acknowledgements
The authors are grateful to CEBIME-UFSC and for the financial support provided by the Brazilian governamental agencies Conselho Nacional de Pesquisa (CNPq) and from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Brazil. RCP (Proc. 302404/2017-2) and DWF (Proc. 303234/2015-6) are recipients of research grants from CNPq, Brazil. RCZ, NSRSM and VMASG are fellows of CAPES/CNPq, Brazil.
Funding
The work was supported by the Brazilian governamental agencies to research Conselho Nacional de Pesquisa (CNPq) and from Coordenação de Aperfeiçoamento de Pessoal de.
Nível Superior (CAPES).
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The authors declare no conflicts of interest. Author Rodrigo C. Zeferino declares that he has no conflict of interest. Author Nádia S.R.S Mota declares that she has no conflict of interest. Author Valdelúcia M.A.S. Grinevicius declares that she has no conflict of interest. Author Karina B. Filipe declares that she has no conflict of interest. Author Paola M. Sulis declares that she has no conflict of interest. Author Fátima R.M.B Silva declares that she has no conflict of interest. Author Danilo W. Filho declares that he has no conflict of interest. Author Claus T. Pich declares that he has no conflict of interest. Author Rozangela C. Pedrosa declares that she has no conflict of interest.
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Supplementary Fig. 1
N-benzyl-2-nitro-1-imidazole-acetamide (benznidazole, BZN) chemical structure and metabolization route (PNG 39 kb)
Supplementary Fig. 2
– BZN binding to DNA: (a) Number of H-bonds formed throughout the MD simulation between BZN and da17 nucleotide residue. (b) BZN and da17 dihedral angles distribution (average angle 146.251o). (c) Binding energy (ΔE) of complex calculated with MM-PBSA. (d) Molecular Mechanics Energy calculated in vacuum with major contribution of van der Waals Energy (blue line) for Total Energy (red line). (e) Contributions to Total Energy related to each residue of nucleotide of DNA (1–24) and ligand (BZN) (25); insert shows color score for contribution energies of da17 (light blue) and BZN (red). (f) Complex Solvation Free Energy (ΔG solv) related to SASA calculated with MM-PBSA (PNG 192 kb)
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Zeferino, R.C., Mota, N.S.R.S., Grinevicius, V.M.A.S. et al. Targeting ROS overgeneration by N-benzyl-2-nitro-1-imidazole-acetamide as a potential therapeutic reposition approach for cancer therapy. Invest New Drugs 38, 785–799 (2020). https://doi.org/10.1007/s10637-019-00820-5
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DOI: https://doi.org/10.1007/s10637-019-00820-5