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Gallium(III) complexes with 2-acetylpyridine-derived thiosemicarbazones: antimicrobial and cytotoxic effects and investigation on the interactions with tubulin

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Complexes [Ga(2Ac4pFPh)2]NO3 (1), [Ga(2Ac4pClPh)2]NO3 (2), [Ga(2Ac4pIPh)2]NO3 (3), [Ga(2Ac4pNO2Ph)2]NO3·3H2O (4) and [Ga(2Ac4pT)2]NO3 (5) were obtained with 2-acetylpyridine N(4)-para-fluorophenyl-(H2Ac4pFPh), 2-acetylpyridine N(4)-para-chlorophenyl-(H2Ac4pClPh), 2-acetylpyridine N(4)-para-iodophenyl-(H2Ac4pIPh), 2-acetylpyridine N(4)-para-nitrophenyl-(H2Ac4pNO2Ph) and 2-acetylpyridine N(4)-para-tolyl-(H2Ac4pT) thiosemicarbazone. 1–5 presented antimicrobial and cytotoxic properties. Coordination to gallium(III) proved to be an effective strategy for activity improvement against Pseudomonas aeruginosa and Candida albicans. The complexes were highly cytotoxic against malignant glioblastoma and breast cancer cells at nanomolar concentrations. The compounds induced morphological changes characteristic of apoptotic death in tumor cells and showed no toxicity against erythrocytes. 2 partially inhibited tubulin assembly at high concentrations and induced cellular microtubule disorganization, but this does not appear to be the main mechanism of cytotoxic activity.

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Acknowledgments

This work was supported by CNPq and INCT-INOFAR (Proc. CNPq 573.364/2008-6). The authors express sincere thanks to LabCRI (UFMG), particularly to Professor Nilvado L. Speziali for the X-ray facilities and measurements.

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Correspondence to Heloisa Beraldo.

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Lessa, J.A., Soares, M.A., dos Santos, R.G. et al. Gallium(III) complexes with 2-acetylpyridine-derived thiosemicarbazones: antimicrobial and cytotoxic effects and investigation on the interactions with tubulin. Biometals 26, 151–165 (2013). https://doi.org/10.1007/s10534-012-9603-1

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