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Milanović Ž, Marković Z, Kesić A, Jovanović Stević S, Petrović B, Avdović E. Influence of acid-base equilibrium on interactions of some monofunctional coumarin Pd(II) complexes with biologically relevant nucleophiles-comprehensive kinetic study. Dalton Trans 2024. [PMID: 38659318 DOI: 10.1039/d4dt00789a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
This aimed to develop a comprehensive theoretical protocol for examining substitution reaction processes. The researchers used a theoretical quantum-mechanical protocol based on the QM-ORSA approach, which estimates the kinetic parameters of thermodynamically favourable reaction pathways. This theoretical protocol was validated by experimentally investigating substitution mechanisms in two previously synthesised Pd(II) complexes: chlorido-[(3-(1-(2-hydroxypropylamino)ethylidene)chroman-2,4-dione)]palladium(II) (C1) and chlorido-[(3-(1-(2-mercaptoethylamino)-ethylidene)-chroman-2,4dione)]palladium(II) (C2), along with biologically relevant nucleophiles, namely L-cysteine (l-Cys), L-methionine (l-Met), and guanosine-5'-monophosphate (5'-GMP). Reactions were investigated under pseudo-first-order conditions, monitoring nucleophile concentration and temperature changes using stopped-flow UV-vis spectrophotometry. All reactions were conducted under physiological conditions (pH = 7.2) at 37 °C. The reactivity of the studied nucleophiles follows the order: l-Cys > l-Met > 5'-GMP, and the reaction mechanism is associative based on the activation parameters. The experimental and theoretical data showed that C2 is more reactive than C1, confirming that the complexes' structural and electronic properties greatly affect their reactivity with selected nucleophiles. The study's findings have confirmed that the primary interaction occurs with the acid-base species L-Cys, mostly through the involvement of the partially negative sulfur atom (87.2%). On the other hand, C2 has a higher propensity for reacting with L-Cys-, primarily through the partially negative oxygen atom (92.6%). The implementation of this theoretical framework will significantly restrict the utilization of chemical substances, hence facilitating cost reduction and environmental protection.
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Affiliation(s)
- Žiko Milanović
- University of Kragujevac, Institute of Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Zoran Marković
- University of Kragujevac, Institute of Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
- Department of Natural Science and Mathematics, State University of Novi Pazar, Vuka Karadžića bb, 36300, Novi Pazar, Serbia
| | - Ana Kesić
- University of Kragujevac, Institute of Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Snežana Jovanović Stević
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia
| | - Edina Avdović
- University of Kragujevac, Institute of Information Technologies, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
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Međedović M, Mijatović A, Baošić R, Lazić D, Milanović Ž, Marković Z, Milovanović J, Arsenijević D, Stojanović B, Arsenijević M, Milovanović M, Petrović B, Simović AR. Synthesis, characterization, biomolecular interactions, molecular docking, and in vitro and in vivo anticancer activities of novel ruthenium(III) Schiff base complexes. J Inorg Biochem 2023; 248:112363. [PMID: 37689038 DOI: 10.1016/j.jinorgbio.2023.112363] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 08/25/2023] [Accepted: 08/28/2023] [Indexed: 09/11/2023]
Abstract
In order to discover new anticancer drugs, novel ruthenium(III) complexes [Ru(L)Cl(H2O)], where L is tetradentate Schiff base bis(acetylacetone)ethylendiimine (acacen, 1), bis(benzoylacetone)ethylendiimine (bzacen, 2), (acetylacetone)(benzoylaceton)ethylendiimine (acacbzacen, 3), bis(acetylacetone)propylendiimine (acacpn, 4), bis(benzoylacetone)propylendiimine (bzacpn, 5) or (acetylacetone)(benzoylaceton)propylendiimine (acacbzacpn, 6), were synthesized. The complexes 1 - 6 were characterized by elemental analysis, molar conductometry, and by various spectroscopic techniques, such as UV-Vis, IR, EPR, and ESI-MS. Based on in vitro DNA/BSA experiments, complexes 2 (bzacen) and 5 (bzacpn) with two aromatic rings showed the highest DNA/BSA-activity, suggesting that the presence of the aromatic ring on the tetradentate Schiff base ligand contributes to increased activity. Moreover, these two compounds showed the highest cytotoxic effects toward human, A549 and murine LLC1 lung cancer cells. These complexes altered the ratio of anti- and pro-apoptotic molecules and induced apoptosis of A549 cells. Further, complexes 2 and 5 reduced the percentage of Mcl1 and Bcl2 expressing LLC1 cells, induced their apoptotic death and exerted an antiproliferative effect against LLC1. Finally, complex 5 reduced the volume of mouse primary heterotopic Lewis lung cancer, while complex 2 reduced the incidence and mean number of metastases per lung. Additionally, molecular docking with DNA revealed that the reduced number of aromatic rings or their absence causes lower intercalative properties of the complexes in order: 2 > 5 > 6 > 3 > 4 > 1. It was observed that conventional hydrogen bonds and hydrophobic interactions contribute to the stabilization of the structures of complex-DNA. A molecular docking study with BSA revealed a predominance of 1 - 6 in binding affinity to the active site III, a third D-shaped hydrophobic pocket within subdomain IB.
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Affiliation(s)
- Milica Međedović
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia
| | - Aleksandar Mijatović
- University of Belgrade, Faculty of Mining and Geology, Đušina 7, 11000 Belgrade, Serbia
| | - Rada Baošić
- University of Belgrade, Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia
| | - Dejan Lazić
- Department of Surgery, Faculty of Medical Sciences, University of Kraujevac, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Žiko Milanović
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of Natural Sciences, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Zoran Marković
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of Natural Sciences, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Jelena Milovanović
- Departement of Histology and Embryology, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Dragana Arsenijević
- Departement of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Bojana Stojanović
- Departement of Patophysiology, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Miloš Arsenijević
- Department of Surgery, Faculty of Medical Sciences, University of Kraujevac, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Marija Milovanović
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia
| | - Ana Rilak Simović
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of Natural Sciences, Jovana Cvijića bb, 34000 Kragujevac, Serbia.
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Beganović A, Petrović B, Surić Mihić M. Extremity dosimetry for exposed workers in positron emission tomography in Bosnia and Herzegovina. Radiat Prot Dosimetry 2023; 199:859-864. [PMID: 37225180 DOI: 10.1093/rpd/ncad117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Occupational exposure in Bosnia and Herzegovina is regulated by the national regulation on radiation protection for occupational and public exposure. All radiation workers are required to be monitored using whole body passive thermoluminescent dosemeters and, in case of non-uniform external exposures, by dosemeters that would indicate dose to the most affected body parts. Exposed workers are almost exclusively employed in the medical field, and some of them work in nuclear medicine departments where they handle unsealed radioactive sources. Introduction of the positron emission tomography-computed tomography (PET-CT) in two largest clinical centers in the country was expected to cause the increase of equivalent doses to hands received by staff handling the positron emitting radionuclides. Hence, routine monitoring of finger doses became a necessity. The purpose of this study was to evaluate the available data on monitoring with ring dosemeters during PET-CT procedure in two hospitals in Bosnia and Herzegovina and compare them with other practices in the nuclear medicine department, as well as with the results of monitoring in other countries. In general, results confirm that effective doses, as well as equivalent doses to hands, are well below annual dose limits. Finger dosemeters have been proven to be an invaluable asset in the incidental situations that sometimes occur in nuclear medicine departments. Different number of patients and differences in injection methodologies are identified as a possible source of differences between doses in two hospitals. Overall, routine evaluation of doses to hands provides a sound basis for possible optimization processes, as well as confirmation of good practices.
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Affiliation(s)
- Adnan Beganović
- Department of Radiation Protection and Medical Physics, Clinical Center of Sarajevo University, Sarajevo, Bosnia and Herzegovina
| | - Biljana Petrović
- Radiation Protection Center, Public Health Institute of Republic of Srpska, Banja Luka, Bosnia and Herzegovina
| | - Marija Surić Mihić
- Sector for Radiological and Nuclear Safety, Ministry of the Interior, Civil Protection Directorate, Zagreb, Croatia
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Međedović M, Rilak Simović A, Ćoćić D, Senft L, Matić S, Todorović D, Popović S, Baskić D, Petrović B. New ruthenium(II) complexes with quinone diimine and substituted bipyridine as inert ligands: synthesis, characterization, mechanism of action, DNA/HSA binding affinity and cytotoxic activity. Dalton Trans 2023; 52:1323-1344. [PMID: 36629870 DOI: 10.1039/d2dt02993f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
This paper presents the synthesis and structural characterization of a series of new ruthenium(II) complexes 1-7, with the general formula mer-[RuL3(N-N)Cl]Cl, where L is 2,2':6',2''-terpyridine (tpy) or 4'-(4-chlorophenyl)-2,2':6',2''-terpyridine (Cl-Ph-tpy) and N-N is o-benzoquinonediimine (o-bqdi), 2,3-naphthoquinonediimine (nqdi), 4,4'-dimethyl-2,2'-bipyridine (dmbpy) or 2,2'-bipyridine-4,4'-dicarboxylic acid (dcbpy). The kinetic results showed that the ligand substitution reactions of new Ru(II)-polypyridyl complexes with biomolecules were affected by different substituents and the aromaticity of meridional tridentate and bidentate spectator ligands as well as by the nature of the entering nucleophile. The reactivity of the complexes increases in the order: dmbpy < dcbipy < nqdi < o-bqdi. In addition, quantum chemical calculations were performed to support the interpretation and discussion of the experimental data. Furthermore, combining ethidium bromide (EB) and Hoechst 33258 (2-(4-hydroxyphenyl)-5-[5-(4-methylpiperazine-1-yl)benzimidazo-2-yl]-benzimidazole) fluorescence assay results implied that 1-7 might interact with calf thymus DNA through partial intercalation and/or minor groove binding. The human serum albumin (HAS)-fluorescence binding studies involving the site markers, eosin Y, as a marker for site I of subdomain IIA, and ibuprofen, as a marker for site II of subdomain IIIA, showed that Ru(II) compounds bind to both sites with moderately strong affinity (Kb = 104-106 M-1). Moreover, these DNA/HSA experimental results were confirmed by molecular docking. Complexes 2, 5 and 6 exerted good to strong and highly selective cytotoxic activity against breast adenocarcinoma (MDA-MB 231), colorectal carcinoma (HCT116) and cervix adenocarcinoma (HeLa). Depending on their structure and cell line, the complexes acted differently in terms of their influence on autophagy, the cell cycle and the engaged apoptotic pathway.
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Affiliation(s)
- Milica Međedović
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
| | - Ana Rilak Simović
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of Natural Sciences, Jovana Cvijića bb, 34000 Kragujevac, Serbia.
| | - Dušan Ćoćić
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
| | - Laura Senft
- Department Chemie, Ludwig-Maximilians Universität (LMU) München, 81377 München, Germany
| | - Sanja Matić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovica 69, 34000 Kragujevac, Serbia
| | - Danijela Todorović
- University of Kragujevac, Faculty of Medical Sciences, Department of Genetics, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Suzana Popović
- University of Kragujevac, Faculty of Medical Sciences, Centre for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Dejan Baskić
- University of Kragujevac, Faculty of Medical Sciences, Centre for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
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Radisavljević S, Kesić A, Ćoćić D, Marković V, Milovanović J, Petrović B, Simović AR. New gold (III) chlorophenyl terpyridine complex: Biomolecular interactions and anticancer activity against human oral squamous cell carcinoma. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6922] [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: 11/12/2022]
Affiliation(s)
| | - Ana Kesić
- University of Kragujevac, Institute for Information Technologies, Department of Science, J. Cvijica bb Kragujevac Serbia
| | - Dušan Ćoćić
- University of Kragujevac, Faculty of Science Kragujevac Serbia
| | - Vladimir Marković
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences University of Kragujevac Kragujevac Serbia
| | - Jelena Milovanović
- Department of Histology and Embryology, Faculty of Medical Sciences University of Kragujevac Kragujevac Serbia
| | | | - Ana Rilak Simović
- University of Kragujevac, Institute for Information Technologies, Department of Science, J. Cvijica bb Kragujevac Serbia
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Ćoćić D, Petrović B, Puchta R, Chrzanowska M, Katafias A, van Eldik R. Investigation of water substitution at Ru II complexes by conceptual density function theory approach. J Comput Chem 2022; 43:1161-1175. [PMID: 35484985 DOI: 10.1002/jcc.26878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/31/2021] [Revised: 03/27/2022] [Accepted: 03/29/2022] [Indexed: 11/08/2022]
Abstract
In this paper, we investigated water exchange reactions and substitution of aqua RuII complexes of general formula [Ru(terpy)(N^N)(H2 O)]2+ (where N^N = ethylenediamine (en), 1,2-(aminomethyl)pyridine (ampy) and 2,2'-bipyridine (bipy)) by ammonia and thioformaldehyde. These reactions were studied in detail by applying conceptual density functional theory. This approach enabled us to gain further insight into the underlying reaction mechanism at the microscopic level (involving only direct participants of the reaction, without the influence of the solvent) and to put the concept of reaction mechanism on a quantitative basis. The course of the chemical reaction along the reaction coordinate ξ, is rationalized in terms of reaction energy, force, dipole moment, and reaction electronic flux (REF). The results yield and characterize the significant influence of an intermolecular hydrogen bond formed between the entering and the spectator ligand to the overall energy barrier of the reactions.
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Affiliation(s)
- Dušan Ćoćić
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac
| | - Biljana Petrović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany.,Central Institute for Scientific Computing (CISC), University of Erlangen-Nuremberg, Erlangen, Germany.,Computer Chemistry Center, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Marta Chrzanowska
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Toruń
| | - Anna Katafias
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Toruń
| | - Rudi van Eldik
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany.,Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Toruń
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Joksimović N, Petronijević J, Radisavljević S, Petrović B, Mihajlović K, Janković N, Milović E, Milivojević D, Ilić B, Djurić A. Synthesis, characterization, antitumor potential, and investigation of mechanism of action of copper( ii) complexes with acylpyruvates as ligands: interactions with biomolecules and kinetic study †. RSC Adv 2022; 12:30501-30513. [PMID: 36337968 PMCID: PMC9597287 DOI: 10.1039/d2ra05797b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 10/20/2022] [Indexed: 11/07/2022] Open
Abstract
Considering the urgency of finding a cure for vicious diseases such as tumors, we have synthesized and characterized a small series of new copper(ii) complexes with biologically important ligands such as acylpyruvate. In addition to this, we used another four copper(ii) complexes, with ligands of the same type to examine the antitumor potential. The antitumor potential of the copper(ii) complexes was examined on three tumor cell lines and one normal human cell line using the MTT assay. All seven tested complexes showed very good cytotoxic effects. Two copper complexes that showed the best antitumor potential were selected for further testing that showed the best potential for potential application in the future. The mechanism of activity of these complexes was examined in detail using tests such as cell cycle, ROS level, oxidative DNA damage, and proteins related to hypoxia analysis. In addition, we examined the binding abilities of these complexes with biomolecules (Guo, Ino, 5′-GMP, BSA, and DNA). The results showed that the tested compounds bind strongly to DNA molecules through intercalation. Also, it has been shown that the tested compounds adequately bind to the BSA molecule, which indicates an even greater potential for some future application of these compounds in clinical practice. Considering the urgency of finding a cure for vicious diseases such as tumors, we have synthesized and characterized a small series of new copper(ii) complexes with biologically important ligands such as acylpyruvate.![]()
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Affiliation(s)
- Nenad Joksimović
- University of Kragujevac, Faculty of Science, Department of ChemistryRadoja Domanovića 1234000 KragujevacSerbia
| | - Jelena Petronijević
- University of Kragujevac, Faculty of Science, Department of ChemistryRadoja Domanovića 1234000 KragujevacSerbia
| | - Snežana Radisavljević
- University of Kragujevac, Faculty of Science, Department of ChemistryRadoja Domanovića 1234000 KragujevacSerbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, Department of ChemistryRadoja Domanovića 1234000 KragujevacSerbia
| | - Kristina Mihajlović
- University of Kragujevac, Faculty of Science, Department of ChemistryRadoja Domanovića 1234000 KragujevacSerbia
| | - Nenad Janković
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of SciencesJovana Cvijića bb34000 KragujevacSerbia
| | - Emilija Milović
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of SciencesJovana Cvijića bb34000 KragujevacSerbia
| | - Dušan Milivojević
- Vinča Institute of Nuclear Science University of BelgradeP.O. Box 52211001BelgradeSerbia
| | - Bojana Ilić
- Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Centre of SerbiaBelgradeSerbia
| | - Ana Djurić
- Institute of Oncology and Radiology of SerbiaPasterova 1411000 BelgradeSerbia
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Jovanović‐Stević S, Ćoćić D, Puchta R, Bogojeski J, Jurišević M, Gajović N, Jakovljević S, Arsenijević N, Jovanović I, Petrović B. Assessment of biological activity of the caffeine‐derived Pt (II) and Pd (II) complexes. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6532] [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: 11/06/2022]
Affiliation(s)
- Snežana Jovanović‐Stević
- Institute for Information Technologies Kragujevac, Department of Science University of Kragujevac Kragujevac Serbia
| | - Dušan Ćoćić
- Faculty of Science University of Kragujevac Kragujevac Serbia
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy University of Erlangen‐Nürnberg Erlangen Germany
- Computer Chemistry Center, Department of Chemistry and Pharmacy University of Erlangen‐Nürnberg Erlangen Germany
- ZISC (Zentralinstitut für Scientific Computing) Universität Erlangen‐Nürnberg Erlangen Germany
| | | | - Milena Jurišević
- Faculty of Medical Sciences, Department of Clinical Pharmacy University of Kragujevac Kragujevac Serbia
| | - Nevena Gajović
- Faculty of Medical Sciences, Center for Molecular Medicine and Stem Cell Research University of Kragujevac Kragujevac Serbia
| | | | - Nebojša Arsenijević
- Faculty of Medical Sciences, Center for Molecular Medicine and Stem Cell Research University of Kragujevac Kragujevac Serbia
| | - Ivan Jovanović
- Faculty of Medical Sciences, Center for Molecular Medicine and Stem Cell Research University of Kragujevac Kragujevac Serbia
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Tóth A, Petrović B, Marjanović M, Gencel I. Flattening filter and flattening filter free dose comparison: in beam and entrance door measurement and Monte Carlo simulation. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00278-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Radisavljević S, Scheurer A, Bockfeld D, Ćoćić D, Puchta R, Senft L, Pešić M, Damljanović I, Petrović B. New mononuclear gold(III) complexes: Synthesis, characterization, kinetic, mechanistic, DNA/BSA/HSA binding, DFT and molecular docking studies. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Milić SSJ, Jevtić VV, Avdović EH, Petrović B, Međedović M, Petrović ĐS, Milovanović M, Milovanović J, Arsenijević N, Stojković DL, Radić GP, Stanković MJ. DNA binding, molecular docking study and antitumor activity of [PdCl2(R2-(S,S)-eddtrp)] complexes. Monatsh Chem 2021. [DOI: 10.1007/s00706-021-02820-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ćoćić D, Jovanović-Stević S, Jelić R, Matić S, Popović S, Djurdjević P, Baskić D, Petrović B. Homo- and hetero-dinuclear Pt(II)/Pd(II) complexes: studies of hydrolysis, nucleophilic substitution reactions, DNA/BSA interactions, DFT calculations, molecular docking and cytotoxic activity. Dalton Trans 2021; 49:14411-14431. [PMID: 33043330 DOI: 10.1039/d0dt02906h] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Three dinuclear complexes [Pd2(tpbd)Cl2]Cl2 (PP1), [Pt2(tpbd)Cl2]Cl2 (PP2) and [PdPt(tpbd)Cl2]Cl2 (PP3) (tpbd = N,N,N',N'-tetrakis(2-pyridylmethyl)benzene-1,4-diamine) have been synthesized and characterized and the protonation constants of their corresponding diaqua analogues have been determined. Also, in water solution, the aqua analogues of these complexes exist as mono-hydroxo, di-hydroxo and dimer μ-hydroxo complexes in the pH between 3.0 and 11.0. Substitution reactions with sulfur- and nitrogen-donor nucleophiles, such as thiourea (Tu), l-methionine (l-Met), glutathione (GSH) and guanosine-5'-monophosphate (5'-GMP), were studied at pH 7.2 by conventional and stopped-flow UV-Vis spectrophotometry and the observed reactivity follows the order: Tu > l-Met > GSH > 5'-GMP. Also, the interactions with calf thymus DNA (CT-DNA) and bovine serum albumin (BSA) were investigated. Competitive studies with DNA were performed in the presence of ethidium bromide and Hoechst dye 33258 as well. The complexes possess the strong ability to react with CT-DNA exhibiting intercalation and more preferable minor groove binding. Nevertheless, all complexes showed a good binding affinity toward BSA with relatively high binding constants. The nature of the binding forces between complexes and biomolecules has been identified as hydrophobic. Experimental results were compared with the molecular docking results, while the relative stability and thermodynamic properties of dinuclear complexes were compared with their mononuclear units by DFT calculations. Among three tested complexes, PP2 showed the most powerful cytotoxic effect on HTB140 and H460 cancer cell lines after 48 h of treatment and exerted a strong long-term influence on the proliferation potential of both tested cell lines. PP2 induced the inhibition of autophagy, G2/M cell cycle arrest and mitotic catastrophe.
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Affiliation(s)
- Dušan Ćoćić
- University of Kragujevac, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
| | - SneŽana Jovanović-Stević
- University of Kragujevac, Institute of Information Technologies, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Ratomir Jelić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Sanja Matić
- University of Kragujevac, Faculty of Medical Sciences, Department of Pharmacy, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Suzana Popović
- University of Kragujevac, Faculty of Medical Sciences, Centre for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Predrag Djurdjević
- University of Kragujevac, Faculty of Medical Sciences, Department of Internal medicine, Svetozara Markovića 69, 34000 Kragujevac, Serbia and Clinic for Haematology, Clinical Centre Kragujevac, Zmaj Jovina 30, 34000 Kragujevac, Serbia
| | - Dejan Baskić
- University of Kragujevac, Faculty of Medical Sciences, Centre for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia and Public Health Institute, Nikole Pašića 1, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, Radoja Domanovića 12, 34000 Kragujevac, Serbia.
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Jovanović-Stević S, Radisavljević S, Scheurer A, Ćoćić D, Šmit B, Petković M, Živanović MN, Virijević K, Petrović B. Bis(triazinyl)pyridine complexes of Pt(II) and Pd(II): studies of the nucleophilic substitution reactions, DNA/HSA interactions, molecular docking and biological activity. J Biol Inorg Chem 2021; 26:625-637. [PMID: 34268603 DOI: 10.1007/s00775-021-01879-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 04/14/2021] [Accepted: 06/07/2021] [Indexed: 11/29/2022]
Abstract
Four new complexes of Pt(II) and Pd(II), [Pd(L1)Cl]Cl 1, [Pd(L2)Cl]Cl 2, [Pt(L1)Cl]Cl 3 and [Pt(L2)Cl]Cl 4 (where L1 = 2,6-bis(5,6-diphenyl-1,2,4-triazin-3-yl)pyridine and L2 = 2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine), were synthesized. Characterization of the complexes was performed using elemental analysis, IR, 1H NMR spectroscopy and MALDI-TOF mass spectrometry. The substitution reactions of 1-4 complexes with L-methionine (L-met), L-cysteine (L-cys) and guanosine-5'-monophosphate (5'-GMP), were studied spectrophotometrically at physiological conditions. Complexes with ligand L1 (1 or 3) were more reactive than those with ligand L2 (2 or 4) by a factor ranging up to 1.57 and 3.71, respectively. The order of reactivity of the nucleophiles was: L-met > L-cys > 5'-GMP. The interactions of complexes with calf thymus-DNA (CT-DNA) and human serum albumin (HSA) were studied by Uv-Vis absorption and fluorescence emission spectroscopy. Competitive binding studies with intercalative agent ethidium bromide (EB) and minor groove binder Hoechst 33258 were performed as well. All studied complexes can interact with DNA through the intercalation and minor groove binding, where the latter was preferred. The binding constants (103 and 104 M-1) for the interaction of complexes with HSA indicate the moderate binding affinity of complexes 1-4 to protein. The trends in the experimental results of binding studies between complexes 3 and 4 with DNA and HSA were compared to those obtained from the molecular docking study. Biological evaluation of cytotoxicity of 1 and 2 on HCT-116 and MDA-MB-231 cell lines showed significant cytotoxic and prooxidative character, while 2 also exerted extraordinary selectivity towards colon cancer in comparison to breast cancer cells. The nucleophilic substitution reactions, DNA/HSA interactions, molecular docking and biological activity of bis(triazinyl)pyridine complexes of Pt(II) and Pd(II) were studied.
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Affiliation(s)
- Snežana Jovanović-Stević
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia.
| | - Snežana Radisavljević
- Faculty of Science, University of Kragujevac, R. Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Dušan Ćoćić
- Faculty of Science, University of Kragujevac, R. Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
| | - Biljana Šmit
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia
| | - Marijana Petković
- "Vinča" Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11001, Belgrade, Serbia
| | - Marko N Živanović
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia
| | - Katarina Virijević
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia
| | - Biljana Petrović
- Faculty of Science, University of Kragujevac, R. Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
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Radisavljević S, Petrović B. Gold(III) Complexes: An Overview on Their Kinetics, Interactions With DNA/BSA, Cytotoxic Activity, and Computational Calculations. Front Chem 2020; 8:379. [PMID: 32509724 PMCID: PMC7251155 DOI: 10.3389/fchem.2020.00379] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 04/09/2020] [Indexed: 12/24/2022] Open
Abstract
In the last few years, metallodrugs play a key role in the development of medicinal chemistry. The choice of metal ion, its oxidation state and stability, and the choice of inert and labile ligands are just some of the very important facts which must be considered before starting the synthesis of complexes with utilization in medicinal purpose. As a result, a lot of compounds of different transition metal ions found application for diagnostic and therapeutic purpose. Beside all, gold compounds have attracted particular attention. It is well-known that gold compounds could be used for the treatment of cancer, HIV, rheumatoid arthritis (chrysotherapy), and other diseases. This metal ion has unoccupied d-sublevels and possibility to form compounds with different oxidation states, from -1 to +5. However, gold(I) and gold(III) complexes are dominant in chemistry and medicine. Especially, gold(III) complexes are of great interest due to their structural similarity with cisplatin. Accordingly, this review summarizes the chemistry of some mononuclear and polynuclear gold(III) complexes. Special attention is given to gold(III) complexes with nitrogen-donor inert ligands (aliphatic or aromatic that have a possibility to stabilize complex) and their kinetic behavior toward different biologically relevant nucleophiles, mechanism of interaction with DNA/bovine serum albumin (BSA), cytotoxic activity, as well as computational calculations.
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Affiliation(s)
- Snežana Radisavljević
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Biljana Petrović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
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Simović AR, Bogojeski J, Petrović B, Jovanović-Stević S. Bis-pyrazolylpyridine Complexes of Some Transition Metal Ions: Structure-Activity Relationships and Biological Activity. MACROHETEROCYCLES 2020. [DOI: 10.6060/mhc200499s] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Radisavljević S, Đeković Kesić A, Ćoćić D, Puchta R, Senft L, Milutinović M, Milivojević N, Petrović B. Studies of the stability, nucleophilic substitution reactions, DNA/BSA interactions, cytotoxic activity, DFT and molecular docking of some tetra- and penta-coordinated gold(iii) complexes. NEW J CHEM 2020. [DOI: 10.1039/d0nj02037k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stability in water and at pH = 7.2, substitution reactions with Tu, 5’-GMP, GSH and l-Met, DNA/BSA interactions, cytotoxicity, DFT and molecular docking of gold(iii) complexes with phenanthroline derivatives as inert ligands were studied.
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Affiliation(s)
- Snežana Radisavljević
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
| | - Ana Đeković Kesić
- State University of Novi Pazar
- Department of Chemical-Technological Sciences
- 36200 Novi Pazar
- Serbia
| | - Dušan Ćoćić
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
| | - Ralph Puchta
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nuremberg
- Erlangen
- Germany
| | - Laura Senft
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nuremberg
- Erlangen
- Germany
| | - Milena Milutinović
- University of Kragujevac, Faculty of Science
- Department of Biology
- 34000 Kragujevac
- Serbia
| | - Nevena Milivojević
- University of Kragujevac, Faculty of Science
- Department of Biology
- 34000 Kragujevac
- Serbia
| | - Biljana Petrović
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
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Petrović B, Jovanović S, Puchta R, van Eldik R. Mechanistic insight on the chemistry of potential Pt antitumor agents as revealed by collaborative research performed in Kragujevac and Erlangen. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Jovanović S, Bogojeski J, Nikolić MV, Mijajlović MŽ, Tomović DL, Bukonjić AM, Knežević Rangelov SM, Mijailović NR, Ratković Z, Jevtić VV, Petrović B, Trifunović RS, Novaković S, Bogdanović G, Radić GP. Interactions of binuclear copper(II) complexes with S-substituted thiosalicylate derivatives with some relevant biomolecules. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1610561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Snežana Jovanović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Jovana Bogojeski
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Miloš V. Nikolić
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Marina Ž. Mijajlović
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Dušan Lj. Tomović
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Andriana M. Bukonjić
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | | | - Nataša R. Mijailović
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Zoran Ratković
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Verica V. Jevtić
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Biljana Petrović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - R. Srećko Trifunović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Slađana Novaković
- Vinča Institute of Nuclear Sciences, Laboratory of Theoretical Physics and Condensed Matter Physics, University of Belgrade, Belgrade, Serbia
| | - Goran Bogdanović
- Vinča Institute of Nuclear Sciences, Laboratory of Theoretical Physics and Condensed Matter Physics, University of Belgrade, Belgrade, Serbia
| | - Gordana P. Radić
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
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Ćoćić D, Jovanović S, Rajković S, Petrović B. Kinetics and mechanism of the substitution reactions of dinuclear platinum(II) complexes with important bio-molecules. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.07.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Ćoćić D, Jovanović S, Radisavljević S, Korzekwa J, Scheurer A, Puchta R, Baskić D, Todorović D, Popović S, Matić S, Petrović B. New monofunctional platinum(II) and palladium(II) complexes: Studies of the nucleophilic substitution reactions, DNA/BSA interaction, and cytotoxic activity. J Inorg Biochem 2018; 189:91-102. [PMID: 30243122 DOI: 10.1016/j.jinorgbio.2018.09.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [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: 06/21/2018] [Revised: 08/28/2018] [Accepted: 09/09/2018] [Indexed: 01/22/2023]
Abstract
Four new complexes [Pd(H2LtBu)Cl]Cl (Pd1), [Pt(H2LtBu)Cl]Cl (Pt1), [Pd(Me2LtBu)Cl]Cl (Pd2) and [Pt(Me2LtBu)Cl]Cl (Pt2) (where H2LtBu = 2,6-bis(5-(tert-butyl)-1H-pyrazol-3-yl)pyridine and Me2LtBu = 2,6-bis(5-(tert-butyl)-1-methyl-1H-pyrazol-3-yl)pyridine) were synthesized and characterized by elemental microanalysis, IR, 1H NMR and ESI-MS methods. The reactivity of complexes towards thiourea (Tu), l-methionine (l-Met), l-cysteine (l-Cys) and guanosine-5'-monophosphate (5'-GMP) was investigated. The obtained order was established as follows: Tu > l-Cys > l-Met > 5'-GMP. Complexes Pd1 and Pt1, that contain H2LtBu as chelator, showed higher reactivity towards biomolecules than those with Me2LtBu. The interaction of complexes with calf thymus DNA (CT-DNA) and bovine serum albumin (BSA) was studied by UV-Vis and fluorescence spectroscopy. The results have shown that complexes can bind to DNA exhibiting high binding constants (Kb = 104 M-1). Obtained results during the examination of competitive reaction with ethidium bromide (EB) showed that complexes can replace EB-bound DNA. High values of binding constants indicate good binding affinity of complexes towards BSA. We evaluated the stability differences between complexes based on terpy as well as H2LtBu/Me2LtBu by DFT calculations (B3LYP(CPCM)/LANL2DZp), showing that both tridentate ligand systems lead to complexes of similar stability. The results of biological testing showed that all complexes exert moderate to high selective cytotoxicity, inducing apoptosis and autophagy in HeLa and PANC-1 tumor cell lines. Pd1 exhibited the strongest cytotoxic effect. Finally, cell cycle analysis showed that in HeLa cells Pd1, Pd2 and Pt1 induced accumulation of cells in S phase, whereas in PANC-1 cells Pd2 and Pt1 induced G2/M cycle arrest and Pd1 induced G0/G1 arrest.
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Affiliation(s)
- Dušan Ćoćić
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Snežana Jovanović
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Snežana Radisavljević
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Jana Korzekwa
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany; Computer Chemistry Center, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany; ZISC (Zentralinstitut für Scientific Computing), Universität Erlangen-Nürnberg, Martensstrasse 5a, 91058 Erlangen, Germany
| | - Dejan Baskić
- University of Kragujevac, Faculty of Medical Sciences, Department of Microbiology and Immunology, Center for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Danijela Todorović
- University of Kragujevac, Faculty of Medical Sciences, Department of Genetics, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Suzana Popović
- University of Kragujevac, Faculty of Medical Sciences, Department of Microbiology and Immunology, Center for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Sanja Matić
- Doctoral Academic Study, Faculty of Medical Sciences, University of Kragujevac, Svetozara Markovica 69, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia.
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Radisavljević S, Kesić AĐ, Jovanović S, Petrović B. Kinetics and mechanism of interactions of some monofunctional Au(III) complexes with sulphur nucleophiles. TRANSIT METAL CHEM 2018. [DOI: 10.1007/s11243-018-0221-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Ćoćić D, Jovanović S, Nišavić M, Baskić D, Todorović D, Popović S, Bugarčić ŽD, Petrović B. New dinuclear palladium(II) complexes: Studies of the nucleophilic substitution reactions, DNA/BSA interactions and cytotoxic activity. J Inorg Biochem 2017; 175:67-79. [DOI: 10.1016/j.jinorgbio.2017.07.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 07/03/2017] [Accepted: 07/09/2017] [Indexed: 12/24/2022]
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Kosović M, Jovanović S, Bogdanović GA, Giester G, Jaćimović Ž, Bugarčić ŽD, Petrović B. Kinetics and mechanism of the substitution reactions of some monofunctional Pt(II) complexes with heterocyclic nitrogen donor molecules. Crystal structure of [Pt(bpma)(pzBr)]Cl2·2H2O. J COORD CHEM 2016. [DOI: 10.1080/00958972.2016.1224336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Milica Kosović
- Faculty of Metallurgy and Technology, University of Montenegro, Podgorica, Montenegro
| | | | - Goran A. Bogdanović
- Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Gerald Giester
- Faculty of Geosciences, Geography and Astronomy, University of Vienna, Wien, Austria
| | - Željko Jaćimović
- Faculty of Metallurgy and Technology, University of Montenegro, Podgorica, Montenegro
| | | | - Biljana Petrović
- Faculty of Science, University of Kragujevac, Kragujevac, Serbia
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Jovanović S, Obrenčević K, Bugarčić ŽD, Popović I, Žakula J, Petrović B. New bimetallic palladium(ii) and platinum(ii) complexes: studies of the nucleophilic substitution reactions, interactions with CT-DNA, bovine serum albumin and cytotoxic activity. Dalton Trans 2016; 45:12444-57. [DOI: 10.1039/c6dt02226j] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Nucleophilic substitution reactions, interactions with CT-DNA, bovine serum albumin and cytotoxic activity of new bimetallic Pt(ii) and Pd(ii) complexes.
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Affiliation(s)
| | | | | | - Iva Popović
- Institute of Nuclear Sciences “Vinča”
- University of Belgrade
- 11001 Belgrade
- Serbia
| | - Jelena Žakula
- Institute of Nuclear Sciences “Vinča”
- University of Belgrade
- 11001 Belgrade
- Serbia
| | - Biljana Petrović
- Faculty of Science
- University of Kragujevac
- 34000 Kragujevac
- Serbia
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Jovanović S, Petrović B, Petković M, Bugarčić ŽD. Kinetics and mechanism of substitution reactions of the new bimetallic [{PdCl(bipy)}{μ-(NH2(CH2)6H2N)}{PtCl(bipy)}]Cl(ClO4) complex with important bio-molecules. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.09.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kosović M, Jaćimović Ž, Bugarčić ŽD, Petrović B. Kinetics and mechanism of the substitution reactions of some monofunctional Pd(II) complexes with different nitrogen-donor heterocycles. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1044446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Milica Kosović
- Faculty of Metallurgy and Technology, University of Montenegro, Podgoria, Montenegro
| | - Željko Jaćimović
- Faculty of Metallurgy and Technology, University of Montenegro, Podgoria, Montenegro
| | - Živadin D Bugarčić
- Faculty of Science, Department of Chemistry, University of Kragujevac, Kragujevac, Serbia
| | - Biljana Petrović
- Faculty of Science, Department of Chemistry, University of Kragujevac, Kragujevac, Serbia
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Marković S, Karkalic R, Petrović B. Disproportionation reaction of iodous acid, HOIO. Determination of the concentrations of the relevant ionic species H+, H2OI+, and IO3 −. Res Chem Intermed 2015. [DOI: 10.1007/s11164-013-1273-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mijatović AM, Jelić RM, Bogojeski J, Bugarčić ŽD, Petrović B. Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles. Monatsh Chem 2013. [DOI: 10.1007/s00706-013-1044-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Selimović E, Petrović B, Čcanović D, Bugarčić ŽD, Bogojeski J. Kinetic Studies on the Reactions of [(TLtBu)PtCl]+ and [Pt(tpdm)Cl]+ Complexes with Some Thiols and Thioethers. Aust J Chem 2013. [DOI: 10.1071/ch12218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Substitution reactions of the complexes [(TLtBu)PtCl]+ and [Pt(tpdm)Cl]+, where TLtBu = 2,6-bis[(1,3-di-tert-butylimidazolin-2-imino)methyl]pyridine and tpdm = terpyridinedimethane, with nucleophiles: S-methyl-L-cysteine (S-Met-L-Cys), L-cysteine (L-Cys), glutathione (GSH) and L-methionine (L-Met) were studied in aqueous 0.1 M NaClO4 solution in the presence of 10 mM NaCl using variable-temperature UV-vis spectrophotometry. The higher reactivity of the complex with the tpdm ligand could be attributed to the influence of the bulkiness of the tert-butyl-groups from the [(TLtBu)PtCl]+ complex. The order of reactivity of the studied ligands is: S-Met-L-Cys > L-Met > GSH > L-Cys. The thioethers (S-Met-L-Cys and L-Met) are more reactive than the thiols (GSH and L-Cys). This order of reactivity is in relation with their electron properties and structures. The negative values reported for the entropy of activation confirmed the associative mode.
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Mijatović A, Šmit B, Rilak A, Petrović B, Čanović D, Bugarčić ŽD. NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jovanović S, Petrović B, Bugarčić ŽD, van Eldik R. Reduction of some Pt(iv) complexes with biologically important sulfur-donor ligands. Dalton Trans 2013; 42:8890-6. [DOI: 10.1039/c3dt50751c] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Đurović M, Bogojeski J, Petrović B, Petrović D, Heinemann FW, Bugarčić ŽD. Ligand substitution reactions of some sterically hindered Pt(II) complexes. The crystal structures of [TLtBuH2](ClO4)2·0.5H2O. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.04.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mijatović A, Bogojeski J, Petrović B, Bugarčić ŽD. Substitution reactions of some novel sterically hindered monofunctional Pd(II) complexes. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.11.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Petrović B, Bugarčić ŽD, Dees A, Ivanović-Burmazović I, Heinemann FW, Puchta R, Steinmann SN, Corminboeuf C, van Eldik R. Role of π-acceptor effects in controlling the lability of novel monofunctional Pt(II) and Pd(II) complexes: crystal structure of [Pt(tripyridinedimethane)Cl]Cl. Inorg Chem 2012; 51:1516-29. [PMID: 22263538 DOI: 10.1021/ic201807a] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The kinetics and mechanism of substitution reactions of novel monofunctional [Pt(tpdm)Cl](+) and [Pd(tpdm)Cl](+) complexes (where tpdm = tripyridinedimethane) and their aqua analogues with thiourea (tu), L-methionine (L-met), glutathione (GSH), and guanosine-5'-monophosphate (5'-GMP) were studied in 0.1 M NaClO(4) at pH = 2.5 (in the presence of 10 mM NaCl for reactions of the chlorido complexes). The reactivity of the investigated nucleophiles follows the order tu > l-met > GSH > 5'-GMP. The reported rate constants showed the higher reactivity of the Pd(II) complexes as well as the higher reactivity of the aqua complex than the corresponding chlorido complex. The negative values reported for the activation entropy as well as the activation volume confirmed an associative substitution mode. In addition, the molecular and crystal structure of [Pt(tpdm)Cl]Cl was determined by X-ray crystallography. The compound crystallizes in a monoclinic space group C2/c with two independent molecules of the complex and unit cell dimensions of a = 38.303(2) Å, b = 9.2555(5) Å, c = 27.586(2) Å, β = 133.573(1)°, and V = 7058.3(8) Å(3). The cationic complex [Pt(tpdm)Cl](+) exhibits square-planar coordination around the Pt(II) center. The lability of the [Pt(tpdm)Cl](+) complex is orders of magnitude lower than that of [Pt(terpyridine)Cl](+). Quantum chemical calculations were performed on the [Pt(tpdm)Cl](+) and [Pt(terpyridine)Cl](+) complexes and their reactions with thiourea. Theoretical computations for the corresponding Ni(II) complexes clearly demonstrated that π-back-bonding properties of the terpyridine chelate can account for acceleration of the nucleophilic substitution process as compared to the tpdm chelate, where introduction of two methylene groups prevents such an effective π-back bonding.
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Affiliation(s)
- Biljana Petrović
- Faculty of Science, University of Kragujevac, Radoja Domanovica 12, P.O. Box 60, 34000 Kragujevac, Serbia
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Djeković A, Petrović B, Bugarčić ŽD, Puchta R, van Eldik R. Kinetics and mechanism of the reactions of Au(iii) complexes with some biologically relevant molecules. Dalton Trans 2012; 41:3633-41. [DOI: 10.1039/c2dt11843b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bugarčić ŽD, Bogojeski J, Petrović B, Hochreuther S, van Eldik R. Mechanistic studies on the reactions of platinum(ii) complexes with nitrogen- and sulfur-donor biomolecules. Dalton Trans 2012; 41:12329-45. [DOI: 10.1039/c2dt31045g] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Jelić R, Marković S, Petrović B. Equilibrium studies on complex formation reactions of dichlorido[(R,R)-trans-1,2-diaminocyclohexane]platinum(II) complex with ligands of biological significance. Monatsh Chem 2011. [DOI: 10.1007/s00706-011-0553-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Damnjanović B, Kamčeva T, Petrović B, Bugarčić ÅID, Petković M. Laser desorption and ionization time-of-flight versus matrix-assisted laser desorption and ionization time-of-flight mass spectrometry of and metal complexes. Anal Methods 2011; 3:400-407. [PMID: 32938043 DOI: 10.1039/c0ay00517g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been recently established as a powerful, "soft" ionization technique for the analysis of both transition metal complexes, which are used as metallo-drugs in the therapy of various types of tumors, and biomolecules. Since some metal complexes absorb light in the UV range, it should be possible to analyse them without additional matrices, i.e. using LDI-TOF MS. In this study, the matrix-free approach was tested for the analysis of [PtCl2(dach)] (dichloride(1,2-diamincyclohexane) platinum(ii)), [RuCl2(en)2]Cl (dichloridobis(ethylenediamine) ruthenium(iii) chloride) and [RuCl2(bipy)2]Cl (bis(bipyridine)dichloridoruthenium(iii) chloride) and the detection limit for these compounds was determined. In summary, the LDI-TOF mass spectra of [PtCl2(dach)] and [RuCl2(en)2]Cl are rather simple, whereas in the presence of 2,5-DHB as a matrix, additional peaks are generated. On the other hand, the standard MALDI-TOF mass spectrum of [RuCl2(bipy)2]Cl exhibits only one peak arising from the complex, in contrast to six peaks detectable in the LDI-TOF mass spectrum. The detection limit in the MALDI-TOF MS analysis of [PtCl2(dach)] and [RuCl2(bipy)2]Cl complexes was lower than that determined in LDI-TOF MS. Taking all into account, in this paper, we have demonstrated some advantages and drawbacks of the matrix-free LDI-TOF mass spectrometric analysis of transition metal complexes.
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Affiliation(s)
- Bojana Damnjanović
- Laboratory of Physical Chemistry, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Republic of Serbia.
| | - Tina Kamčeva
- Laboratory of Physical Chemistry, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Republic of Serbia.
| | - Biljana Petrović
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Republic of Serbia
| | - Å Ivadin D Bugarčić
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Republic of Serbia
| | - Marijana Petković
- Laboratory of Physical Chemistry, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Republic of Serbia.
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Jovanović S, Petrović B, Čanović D, Bugarčić ŽD. Kinetics of the substitution reactions of some Pt(II) complexes with 5′-GMP and L
-histidine. INT J CHEM KINET 2010. [DOI: 10.1002/kin.20537] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Jovanović S, Petrović B, Bugarčić ŽD. UV-Vis, HPLC, and 1H-NMR studies of the substitution reactions of some Pt(IV) complexes with 5′-GMP and L-histidine. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.490296] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Snežana Jovanović
- a Faculty of Science, Department of Chemistry , University of Kragujevac , R. Domanovića 12, PO Box 60, Kragujevac 34000, Serbia
| | - Biljana Petrović
- a Faculty of Science, Department of Chemistry , University of Kragujevac , R. Domanovića 12, PO Box 60, Kragujevac 34000, Serbia
| | - Živadin D. Bugarčić
- a Faculty of Science, Department of Chemistry , University of Kragujevac , R. Domanovića 12, PO Box 60, Kragujevac 34000, Serbia
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42
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Šmit B, Petrović B, Sovilj S, Čanović D, Bugarčić ŽD. Study of the reactions of cisplatin with ranitidine and nizatidine by means of 1H NMR spectroscopy in D2O. Monatsh Chem 2008. [DOI: 10.1007/s00706-008-0915-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Petrović B, Bugarčić ŽD, van Eldik R. Kinetic studies on the reactions of [Pd(dach)(X–Y)] complexes with some DNA constituents. Dalton Trans 2008:807-13. [DOI: 10.1039/b714329j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Bugarcić ZD, Rosić J, Petrović B, Summa N, Puchta R, van Eldik R. Kinetics and mechanism of the substitution reactions of [PtCl(bpma)]+, [PtCl(gly-met-S,N,N)] and their aqua analogues with L-methionine, glutathione and 5'-GMP. J Biol Inorg Chem 2007; 12:1141-50. [PMID: 17710451 DOI: 10.1007/s00775-007-0283-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2007] [Accepted: 07/23/2007] [Indexed: 02/04/2023]
Abstract
The substitution reactions of [PtCl(bpma)]+, [PtCl(gly-met-S,N,N)], [Pt(bpma)(H(2)O)](2+) and [Pt(gly-met-S,N,N)(H(2)O)](+) [where bpma is bis(2-pyridylmethyl)amine and gly-met-S,N,N is glycylmethionine] with L-methionine, glutathione and guanosine 5'-monophosphate (5'-GMP) were studied in aqueous solutions in 0.10 M NaClO(4) under pseudo-first-order conditions as a function of concentration and temperature using UV-vis spectrophotometry. The reactions of the chloro complexes were followed in the presence of 10 mM NaCl and at pH approximately 5, whereas the reactions of the aqua complexes were studied at pH 2.5. The [PtCl(bpma)]+ complex is more reactive towards the chosen nucleophiles than [PtCl(gly-met-S,N,N)]. Also, the aqua complexes are more reactive than the corresponding chloro complexes. The activation parameters for all the reactions studied suggest an associative substitution mechanism. The reactions of [PtCl(bpma)]+ and [PtCl(gly-met-S,N,N)] with 5'-GMP were studied by using (1)H NMR spectroscopy at 298 K. The pK (a) value of the [Pt(gly-met-S,N,N)(H(2)O)]+ complex is 5.95. Density functional theory calculations (B3LYP/LANL2DZp) show that in all cases guanine coordination to the L(3)Pt fragment (L(3) is terpyridine, bpma, diethylenetriamine, gly-met-S,N,N) is much more favorable than the thioether-coordinated form. The calculations collectively support the experimentally observed substitution of thioethers from Pt(II) complexes by N7-GMP. This study throws more light on the mechanistic behavior of platinum antitumor complexes.
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Affiliation(s)
- Zivadin D Bugarcić
- Department of Chemistry, Faculty of Science, University of Kragujevac, R. Domanovića 12, Kragujevac, Serbia
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Petrović D, Stojimirović B, Petrović B, Bugarcić ZM, Bugarcić ZD. Studies of interactions between platinum(II) complexes and some biologically relevant molecules. Bioorg Med Chem 2007; 15:4203-11. [PMID: 17412597 DOI: 10.1016/j.bmc.2007.03.059] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2007] [Accepted: 03/20/2007] [Indexed: 10/23/2022]
Abstract
The reactions of Pt(II) complexes, cis-[Pt(NH3)2Cl2], [Pt(terpy)Cl]+, [Pt(terpy)(S-cys)]2+, and [Pt(terpy)(N7-guo)]2+, where terpy=2,2':6',2''-terpyridine, S-cys=L-cysteine, and N7-guo=guanosine, with some biologically relevant ligands such as guanosine-5'-monophosphate (5'-GMP), L-cysteine, glutathione (GSH) and some strong sulfur-containing nucleophiles such as diethyldithiocarbamate (dedtc), thiosulfate (sts), and thiourea (tu), were studied in aqueous 0.1 M Hepes at pH of 7.4 using UV-vis, stopped-flow spectrophotometry, and 1H NMR spectroscopy.
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Affiliation(s)
- Dejan Petrović
- University of Kragujevac, Faculty of Medicine, S. Markovića 69, 34000 Kragujevac, Serbia
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Rosić J, Petrović B, Djuran MI, Bugarčić ŽD. Thermodynamic and Kinetic Studies on Reactions of Pt(II) Complexes with Pyrazole, Pyridazine, and 1,2,4-Triazole. Monatsh Chem 2006. [DOI: 10.1007/s00706-006-0568-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Jaganyi D, Tiba F, Munro OQ, Petrović B, Bugarcić ZD. Kinetic and mechanistic study on the reactions of [Pt(bpma)(H2O)]2+and [Pd(bpma)(H2O)]2+with some nucleophiles. Crystal structure of [Pd(bpma)(py)](ClO4)2. Dalton Trans 2006:2943-9. [PMID: 16770452 DOI: 10.1039/b602950g] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Substitution reactions of the complexes [Pd(bpma)(H2O)]2+ and [Pt(bpma)(H2O)]2+, where bpma = bis(2-pyridylmethyl)amine, with TU, DMTU and TMTU for both complexes and Cl-, Br-, I- and SCN- for the platinum complex, were studied in aqueous 0.10 M NaClO4 at pH 2.5 using a variable-temperature stopped-flow spectrophotometer. The pKa value for the coordinated water molecule in [Pd(bpma)(H2O)]2+ (6.67) is a unit higher than that of [Pt(bpma)(H2O)]2+. The observed pseudo-first-order rate constants k(obs) (s(-1)) obeyed the equation k(obs) = k2[Nu] (Nu = nucleophile). The second-order rate constants indicate that the Pd(II) complex is a factor of 10(3) more reactive than Pt(II) complex. The nucleophile reactivity attributed to the steric hindrance in case of TMTU and the inductive effect for DMTU was found to be DMTU > TU > TMTU for [Pt(bpma)(H2O)]2+ and DMTU approximately TU > TMTU for [Pd(bpma)(H2O)]2+. The trend for ionic nucleophile was I- > SCN- > Br- > Cl-, an order linked to their polarizability and the softness or hardness of the metal. Activation parameters were determined for all reactions and the negative entropies of activation (Delta S++) support an associative ligand substitution mechanism. The X-ray crystal structure of [Pd(bpma)(py)](ClO4)2 was determined; it belongs to the triclinic space group P1 and has one formula unit in the unit cell. The unit cell dimensions are a = 8.522(2), b = 8.627(2), c = 16.730(4) A; alpha = 89.20(2), beta = 81.03(2), gamma = 60.61(2) degrees ; V = 1055.7(5) A3. The structure was solved using direct methods in WinGX's implementation of SHELXS-97 and refined to R = 0.054. The coordination geometry of [Pd(bpma)(py)]2+ is distorted square-planar. The Pd-N(central) bond distance, 1.996(3) A, is shorter than the other two Pd-N distances, 2.017(3) and 2.019(3) A. The Pd-N(pyridine) distance is 2.037(3) A.
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Affiliation(s)
- Deogaratius Jaganyi
- School of Chemical and Physical Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg, South Africa 3201.
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Djordjević V, Milovanović J, Petrović Z, Dudvarski Z, Petrović B, Stanković P. [Radical surgery of the malignant laryngeal tumors]. Acta Chir Iugosl 2005; 51:31-5. [PMID: 15756784 DOI: 10.2298/aci0401031d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Modern therapeutical protocols for treatment of T3 and T4 malignomas of the larynx are not adjusted, because there are attempts to treat these diseases with non-operative methods (such as chemo- and radiotherapy) in order to preserve the organ. The aim of the study was to establish today's results of the surgical treatement of patients with T3 and T4 laryngeal malignoma. We studied the group of patients with laryngeal carcinoma, who had undergone total laryngectomy, during the period of eight years (1990-1997). The patients' data was submitted from medical documentation, it was filled in specially designed questionnaries and was statistically reviewed. During this eight-year-period, 1054 total laryngectomies were done. The five-years survival rate, established in the group of patients who had undergone total laryngectomiy is 308/794 (39%). In the patient group where total laryngectomy was salvage surgery after radiotherapy, the five-years survival rate is 47/172 (27%). In the patient group where total laryngectomy was salvage surgery after conservative or reconstructive surgery, the five-years survival rate is 28/84 (33%). Despite diagnostical and therapeutical achievements, prognosis for T3 and T4 malygnoma of the larynx was not significantly approved in the last few decades.
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Affiliation(s)
- V Djordjević
- Institut za otorinolaringologiju i muaksilofacijalnu hirurgiju, Klinicki Centar Srbije, Beograd
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Carelli MD, Conway L, Oriani L, Petrović B, Lombardi C, Ricotti M, Barroso A, Collado J, Cinotti L, Todreas N, Grgić D, Moraes M, Boroughs R, Ninokata H, Ingersoll D, Oriolo F. The design and safety features of the IRIS reactor. Nuclear Engineering and Design 2004. [DOI: 10.1016/j.nucengdes.2003.11.022] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
The aim of this study was to detect the sites and frequency of possible lesions by brain magnetic resonance imaging (MRI; 1,5T) in a group of 16 neurologically asymptomatic patients with hepatic form of Wilson's disease (WD; seven untreated and nine under treatment). Abnormal MR findings of the brain were found in 75% of patients. Lesions in brain parenchyma were detected in all untreated, drug-naive patients and in 44% of treated patients. Abnormal signal in globus pallidus, putamen, and caudate nucleus was revealed in 86, 71 and 71% of treated and in 33, 33 and 22% of untreated patients, respectively. In five of eight patients with putaminal pathology (62.5%) and in four of seven patients with caudate nuclei involvement (57%), only proton density 2-weighted sequence (PDW) exhibited sensitivity for lesion detection, with both T1W and long echo T2W sequences being insensitive. This superiority of PDW sequence was even more pronounced in the group of untreated patients in whom 80% of putaminal pathology was visible exclusively on this sequence. The lower frequency of lesions in the group of treated in comparison with untreated patients indicated that they might be reversible in the course of chronic chelating therapy.
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Affiliation(s)
- D Kozić
- Diagnostic Imaging Center, Institute of Oncology, Sremska Kamenica, Belgrade, Yugoslavia.
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