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Štekláč M, Breza M. DFT studies of camptothecins cytotoxicity IV — active and inactive forms of irinotecan. Acta Chimica Slovaca 2023. [DOI: 10.2478/acs-2023-0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Abstract
Abstract
Structures of irinotecan (CPT-11) in neutral lactone, neutral carboxyl, and anionic carboxylate forms in singlet ground states and of their complexes with Cu(II) in doublet ground states are optimized using B3LYP/6-311G* treatment. Metal ion affinities (MIA), Cu charges and Laplacians of Cu-ligand bond critical points of possible CPT active sites are evaluated. The formation of Cu(II) complexes with the anionic carboxylate ligand leads to the release of CO2 that can cause a decrease in the concentration of the active lactone form due to equilibria between all forms of the drug. MIA values and electron density transfer to Cu increase in the sequence lactone < neutral carboxyl < anionic carboxylate. Both neutral forms of irinotecan exhibit lower MIA values than those of camptothecin, unlike the anionic carboxylate form.
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Kabanda MM, Bahadur I, Singh P. Antioxidant and anticancer properties of plant‐based bioactive flavonoids cardamonin and alpinetin: A theoretical insight from
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OOH antiradical and Cu (II) chelation mechanisms. J PHYS ORG CHEM 2022. [DOI: 10.1002/poc.4428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mwadham M. Kabanda
- Department of Chemistry, School of Natural and Mathematical Sciences, Faculty of Science, Engineering and Agriculture University of Venda Thohoyandou South Africa
| | - Indra Bahadur
- Department of Chemistry, Faculty of Natural and Agricultural Sciences, North‐West University South Africa
| | - Prashant Singh
- Department of Chemistry, Atma Ram Sanatan Dharma College University of Delhi New Delhi India
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Štekláč M, Breza M. DFT studies of camptothecins cytotoxicity III: camptothecin, irinotecan and SN-38. Acta Chimica Slovaca 2022; 15:72-84. [DOI: 10.2478/acs-2022-0009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Geometries of camptothecin, irinotecan, SN-38, and of their hypothetical Cu(II) complexes were optimized at the B3LYP/6-311G* level of theory. Their electron structure, evaluated in terms of Mulliken population analysis and Quantum Theory of Atoms-in-Molecule, was subsequently related to in vitro cytotoxicity. Electron density transfer from the relevant active sites to Cu decreases in the sequence irinotecan > SN-38 > camptothecin. The absolute values of their metal-ligand interaction energies exhibit the same trend. Discrepancy with the least relative in vitro cytotoxicity of irinotecan can be explained by differences in its pharmacokinetics.
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