Abstract
Levofloxacin (LVX) is among the fluoroquinolones antibiotics that has also been studied in vitro and in vivo for its anticancer effects. In this study, we used LVX and novel LVX thionated derivatives; compounds 2 and 3, to evaluate their antioxidant activity, aldehyde dehydrogenase (ALDH) enzymes activity inhibition, and anticancer activity. Combination treatments with doxorubicin (DOX) were investigated as well. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay was used to determine the antioxidant activity. The NADH fluorescence spectrophotometric activity assay was used to determine the ALDH inhibitory effects. Resazurin dye method was applied for cell viability assays. Molecular Operating Environment software was used for the molecular docking experiments. Compared to ascorbic acid, DPPH assay showed that compound 3 had the highest antioxidant activity among the tested compounds with approximately 35% scavenging activity. On ALDH enzymes, compound 3 showed a significant ALDH activity inhibition compared to compound 2 at 200 µM. The IC50 values for the tested compounds were approximately 100 µM on A549 cell line, a non-small cell lung cancer (NSCLC) cell line. However, significant enhancement of cytotoxicity and reduction of IC50 values were observed by combining DOX and synergism was achieved with LVX with a combination index value of 0.4. The molecular docking test showed a minimum binding energy with a good affinity for compound 3 towards ALDH enzymes. Thionated LVX derivatives, may be repurposed for NSCLC therapy in combination with DOX, taking into account the antioxidant activity, ALDH activity inhibition, and the molecular docking results of compound 3.
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The authors declare that the data supporting the findings of this study are available within the paper. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank Al-Zaytoonah University of Jordan for financially supporting this work; fully supported by grant number 23/16/2021–2022 and partially supported by grant number 32/11/2020–2021.
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This work was supported by Al-Zaytoonah University of Jordan grants; fully supported by grant number 23/16/2021–2022 and partially supported by grant number 32/11/2020–2021.
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Conceptualization: H.A. and O.H.A.; Methodology: H.A., O.H.A., W.K., H.A., A.I.M.I., M.K.H., D.H.A. and W.H.I.; Formal analysis and investigation: H.A. and O.H.A.; Writing - original draft preparation: H.A. and O.H.A.; Writing - review and editing: H.A., O.H.A., W.K., H.A. and A.I.M.I.; Funding acquisition: H.A. and O.H.A.; Supervision: H.A. and O.H.A. All authors read and approved the final manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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Abumansour, H., Abusara, O.H., Khalil, W. et al. Biological evaluation of levofloxacin and its thionated derivatives: antioxidant activity, aldehyde dehydrogenase enzyme inhibition, and cytotoxicity on A549 cell line. Naunyn-Schmiedeberg's Arch Pharmacol (2024). https://doi.org/10.1007/s00210-024-03075-x
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DOI: https://doi.org/10.1007/s00210-024-03075-x