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Holzer I, Desiatkina O, Anghel N, Johns SK, Boubaker G, Hemphill A, Furrer J, Păunescu E. Synthesis and Antiparasitic Activity of New Trithiolato-Bridged Dinuclear Ruthenium(II)-arene-carbohydrate Conjugates. Molecules 2023; 28:902. [PMID: 36677958 PMCID: PMC9865825 DOI: 10.3390/molecules28020902] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 01/18/2023] Open
Abstract
Eight novel carbohydrate-tethered trithiolato dinuclear ruthenium(II)-arene complexes were synthesized using CuAAC ‘click’ (Cu(I)-catalyzed azide-alkyne cycloaddition) reactions, and there in vitro activity against transgenic T. gondii tachyzoites constitutively expressing β-galactosidase (T. gondii β-gal) and in non-infected human foreskin fibroblasts, HFF, was determined at 0.1 and 1 µM. When evaluated at 1 µM, seven diruthenium-carbohydrate conjugates strongly impaired parasite proliferation by >90%, while HFF viability was retained at 50% or more, and they were further subjected to the half-maximal inhibitory concentration (IC50) measurement on T. gondii β-gal. Results revealed that the biological activity of the hybrids was influenced both by the nature of the carbohydrate (glucose vs. galactose) appended on ruthenium complex and the type/length of the linker between the two units. 23 and 26, two galactose-based diruthenium conjugates, exhibited low IC50 values and reduced effect on HFF viability when applied at 2.5 µM (23: IC50 = 0.032 µM/HFF viability 92% and 26: IC50 = 0.153 µM/HFF viability 97%). Remarkably, compounds 23 and 26 performed significantly better than the corresponding carbohydrate non-modified diruthenium complexes, showing that this type of conjugates are a promising approach for obtaining new antiparasitic compounds with reduced toxicity.
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Affiliation(s)
- Isabelle Holzer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Oksana Desiatkina
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Nicoleta Anghel
- Institute of Parasitology Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
| | - Serena K. Johns
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
- School of Chemistry, Cardiff University, Park Place, Cardiff CF103AT, UK
| | - Ghalia Boubaker
- Institute of Parasitology Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
| | - Andrew Hemphill
- Institute of Parasitology Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
| | - Julien Furrer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Emilia Păunescu
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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Desiatkina O, Boubaker G, Anghel N, Amdouni Y, Hemphill A, Furrer J, Păunescu E. Synthesis, Photophysical Properties and Biological Evaluation of New Conjugates BODIPY: Dinuclear Trithiolato-Bridged Ruthenium(II)-Arene Complexes. Chembiochem 2022; 23:e202200536. [PMID: 36219484 DOI: 10.1002/cbic.202200536] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/11/2022] [Indexed: 01/25/2023]
Abstract
The synthesis, photophysical properties and antiparasitic efficacy against Toxoplasma gondii β-gal (RH strain tachyzoites expressing β-galactosidase) grown in human foreskin fibroblast monolayers (HFF) of a series of 15 new conjugates BODIPY-trithiolato-bridged dinuclear ruthenium(II)-arene complexes are reported (BODIPY=4,4-difluoro-4-bora-3a,4a-diaza-s-indacene, derivatives used as fluorescent markers). The influence of the bond type (amide vs. ester), as well as that of the length and nature (alkyl vs. aryl) of the spacer between the dye and the diruthenium(II) complex moiety, on fluorescence and biological activity were evaluated. The assessed photophysical properties revealed that despite an important fluorescence quenching effect observed after conjugating the BODIPY to the diruthenium unit, the hybrids could nevertheless be used as fluorescent tracers. Although the antiparasitic activity of this series of conjugates appears limited, the compounds demonstrate potential as fluorescent probes for investigating the intracellular trafficking of trithiolato-bridged dinuclear Ru(II)-arene complexes in vitro.
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Affiliation(s)
- Oksana Desiatkina
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Ghalia Boubaker
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland
| | - Nicoleta Anghel
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland
| | - Yosra Amdouni
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland.,Laboratoire de Parasitologie, Université de la Manouba, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, École Nationale de Médecine Vétérinaire de Sidi Thabet, 2020, Sidi Thabet, Tunisia
| | - Andrew Hemphill
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012, Bern, Switzerland
| | - Julien Furrer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Emilia Păunescu
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
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Desiatkina O, Mösching M, Anghel N, Boubaker G, Amdouni Y, Hemphill A, Furrer J, Păunescu E. New Nucleic Base-Tethered Trithiolato-Bridged Dinuclear Ruthenium(II)-Arene Compounds: Synthesis and Antiparasitic Activity. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238173. [PMID: 36500266 PMCID: PMC9738179 DOI: 10.3390/molecules27238173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 11/18/2022] [Accepted: 11/22/2022] [Indexed: 11/25/2022]
Abstract
Aiming toward compounds with improved anti-Toxoplasma activity by exploiting the parasite auxotrophies, a library of nucleobase-tethered trithiolato-bridged dinuclear ruthenium(II)-arene conjugates was synthesized and evaluated. Structural features such as the type of nucleobase and linking unit were progressively modified. For comparison, diruthenium hybrids with other type of molecules were also synthesized and assessed. A total of 37 compounds (diruthenium conjugates and intermediates) were evaluated in a primary screening for in vitro activity against transgenic Toxoplasma gondii tachyzoites constitutively expressing β-galactosidase (T. gondii β-gal) at 0.1 and 1 µM. In parallel, the cytotoxicity in non-infected host cells (human foreskin fibroblasts, HFF) was determined by alamarBlue assay. Twenty compounds strongly impairing parasite proliferation with little effect on HFF viability were subjected to T. gondii β-gal half maximal inhibitory concentration determination (IC50) and their toxicity for HFF was assessed at 2.5 µM. Two promising compounds were identified: 14, ester conjugate with 9-(2-oxyethyl)adenine, and 36, a click conjugate bearing a 2-(4-(hydroxymethyl)-1H-1,2,3-triazol-1-yl)methyl substituent, with IC50 values of 0.059 and 0.111 µM respectively, significantly lower compared to pyrimethamine standard (IC50 = 0.326 µM). Both 14 and 36 exhibited low toxicity against HFF when applied at 2.5 µM and are candidates for potential treatment options in a suitable in vivo model.
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Affiliation(s)
- Oksana Desiatkina
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Martin Mösching
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Nicoleta Anghel
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
| | - Ghalia Boubaker
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
| | - Yosra Amdouni
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
- Laboratoire de Parasitologie, Institution de la Recherche et de l'Enseignement Supérieur Agricoles, Université de la Manouba, École Nationale de Médecine Vétérinaire de Sidi Thabet, Sidi Thabet 2020, Tunisia
| | - Andrew Hemphill
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, Länggass-Strasse 122, 3012 Bern, Switzerland
| | - Julien Furrer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Emilia Păunescu
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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Riedl CA, Rosner A, Harringer S, Salomon P, Hejl M, Jakupec MA, Kandioller W, Keppler BK. Water-soluble trithiolato-bridged dinuclear ruthenium(II) and osmium(II) arene complexes with bisphosphonate functionalized ligands as anticancer organometallics. J Inorg Biochem 2021; 225:111618. [PMID: 34607124 DOI: 10.1016/j.jinorgbio.2021.111618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 09/10/2021] [Accepted: 09/16/2021] [Indexed: 10/20/2022]
Abstract
Trithiolato-bridged dinuclear ruthenium(II) complexes [Ru2(p-cym)2(SR)3]Cl (p-cym = p-cymene, R = benzyl derivatives) are regarded as the most cytotoxically potent metal(II) arene antineoplastics, but are oftentimes limited by their poor solubility in aqueous media. Thus, we designed bisphosphonate-functionalized ligands for use in a modular two-step complexation process to synthesize six trithiolato-bridged dinuclear ruthenium(II) and osmium(II) arene complexes bearing one to three bisphosphonate-benzylmercaptane derived ligands. In addition to improved aqueous solubility the high affinity of bisphosphonates towards apatite structures found in bone and bone metastases may grant selective targeting properties to functionalized organometallics. The complex stabilities and hydroxyapatite binding behavior were determined by UV/Vis spectroscopy. The bisphosphonate functionalization decreases antiproliferative activity in vitro, which was correlated to lower cellular accumulation, due to the different lipophilic profiles of the drug candidates.
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Affiliation(s)
- Christoph A Riedl
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria; Research Cluster "Translational Cancer Therapy Research", Waehringer Str. 42, 1090 Vienna, Austria.
| | - Alexander Rosner
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria
| | - Sophia Harringer
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria
| | - Philipp Salomon
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria
| | - Michaela Hejl
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria
| | - Michael A Jakupec
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria; Research Cluster "Translational Cancer Therapy Research", Waehringer Str. 42, 1090 Vienna, Austria
| | - Wolfgang Kandioller
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria; Research Cluster "Translational Cancer Therapy Research", Waehringer Str. 42, 1090 Vienna, Austria.
| | - Bernhard K Keppler
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Austria; Research Cluster "Translational Cancer Therapy Research", Waehringer Str. 42, 1090 Vienna, Austria
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Synthesis and Antiparasitic Activity of New Conjugates—Organic Drugs Tethered to Trithiolato-Bridged Dinuclear Ruthenium(II)–Arene Complexes. INORGANICS 2021. [DOI: 10.3390/inorganics9080059] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Tethering known drugs to a metalorganic moiety is an efficient approach for modulating the anticancer, antibacterial, and antiparasitic activity of organometallic complexes. This study focused on the synthesis and evaluation of new dinuclear ruthenium(II)–arene compounds linked to several antimicrobial compounds such as dapsone, sulfamethoxazole, sulfadiazine, sulfadoxine, triclosan, metronidazole, ciprofloxacin, as well as menadione (a 1,4-naphtoquinone derivative). In a primary screen, 30 compounds (17 hybrid molecules, diruthenium intermediates, and antimicrobials) were assessed for in vitro activity against transgenic T. gondii tachyzoites constitutively expressing β-galactosidase (T. gondii β-gal) at 0.1 and 1 µM. In parallel, the cytotoxicity in noninfected host cells (human foreskin fibroblasts, HFF) was determined by an alamarBlue assay. When assessed at 1 µM, five compounds strongly impaired parasite proliferation by >90%, and HFF viability was retained at 50% or more, and they were further subjected to T. gondii β-gal dose-response studies. Two compounds, notably 11 and 13, amide and ester conjugates with sulfadoxine and metronidazole, exhibited low IC50 (half-maximal inhibitory concentration) values 0.063 and 0.152 µM, and low or intermediate impairment of HFF viability at 2.5 µM (83 and 64%). The nature of the anchored drug as well as that of the linking unit impacted the biological activity.
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Steel TR, Walsh F, Wieczorek-Błauż A, Hanif M, Hartinger CG. Monodentately-coordinated bioactive moieties in multimodal half-sandwich organoruthenium anticancer agents. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213890] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Studer V, Anghel N, Desiatkina O, Felder T, Boubaker G, Amdouni Y, Ramseier J, Hungerbühler M, Kempf C, Heverhagen JT, Hemphill A, Ruprecht N, Furrer J, Păunescu E. Conjugates Containing Two and Three Trithiolato-Bridged Dinuclear Ruthenium(II)-Arene Units as In Vitro Antiparasitic and Anticancer Agents. Pharmaceuticals (Basel) 2020; 13:E471. [PMID: 33339451 PMCID: PMC7767221 DOI: 10.3390/ph13120471] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/10/2020] [Accepted: 12/11/2020] [Indexed: 12/15/2022] Open
Abstract
The synthesis, characterization, and in vitro antiparasitic and anticancer activity evaluation of new conjugates containing two and three dinuclear trithiolato-bridged ruthenium(II)-arene units are presented. Antiparasitic activity was evaluated using transgenic Toxoplasmagondii tachyzoites constitutively expressing β-galactosidase grown in human foreskin fibroblasts (HFF). The compounds inhibited T.gondii proliferation with IC50 values ranging from 90 to 539 nM, and seven derivatives displayed IC50 values lower than the reference compound pyrimethamine, which is currently used for treatment of toxoplasmosis. Overall, compound flexibility and size impacted on the anti-Toxoplasma activity. The anticancer activity of 14 compounds was assessed against cancer cell lines A2780, A2780cisR (human ovarian cisplatin sensitive and resistant), A24, (D-)A24cisPt8.0 (human lung adenocarcinoma cells wild type and cisPt resistant subline). The compounds displayed IC50 values ranging from 23 to 650 nM. In A2780cisR, A24 and (D-)A24cisPt8.0 cells, all compounds were considerably more cytotoxic than cisplatin, with IC50 values lower by two orders of magnitude. Irrespective of the nature of the connectors (alkyl/aryl) or the numbers of the di-ruthenium units (two/three), ester conjugates 6-10 and 20 exhibited similar antiproliferative profiles, and were more cytotoxic than amide analogues 11-14, 23, and 24. Polynuclear conjugates with multiple trithiolato-bridged di-ruthenium(II)-arene moieties deserve further investigation.
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Affiliation(s)
- Valentin Studer
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland; (V.S.); (O.D.); (T.F.)
| | - Nicoleta Anghel
- Vetsuisse Faculty, Institute of Parasitology, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland; (N.A.); (G.B.); (Y.A.); (J.R.)
| | - Oksana Desiatkina
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland; (V.S.); (O.D.); (T.F.)
| | - Timo Felder
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland; (V.S.); (O.D.); (T.F.)
| | - Ghalia Boubaker
- Vetsuisse Faculty, Institute of Parasitology, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland; (N.A.); (G.B.); (Y.A.); (J.R.)
| | - Yosra Amdouni
- Vetsuisse Faculty, Institute of Parasitology, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland; (N.A.); (G.B.); (Y.A.); (J.R.)
- Laboratoire de Parasitologie, Institution de la Recherche et de l’Enseignement Supérieur Agricoles, École Nationale de Médecine Vétérinaire de Sidi Thabet, University of Manouba, Sidi Thabet 2020, Tunisia
| | - Jessica Ramseier
- Vetsuisse Faculty, Institute of Parasitology, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland; (N.A.); (G.B.); (Y.A.); (J.R.)
| | - Martin Hungerbühler
- Department of BioMedical Research, Experimental Radiology, University of Bern, CH-3008 Bern, Switzerland; (M.H.); (C.K.); (J.T.H.)
- Department of Diagnostic, Interventional and Pediatric Radiology, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Christoph Kempf
- Department of BioMedical Research, Experimental Radiology, University of Bern, CH-3008 Bern, Switzerland; (M.H.); (C.K.); (J.T.H.)
- Department of Diagnostic, Interventional and Pediatric Radiology, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Johannes Thomas Heverhagen
- Department of BioMedical Research, Experimental Radiology, University of Bern, CH-3008 Bern, Switzerland; (M.H.); (C.K.); (J.T.H.)
- Department of Diagnostic, Interventional and Pediatric Radiology, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Andrew Hemphill
- Vetsuisse Faculty, Institute of Parasitology, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland; (N.A.); (G.B.); (Y.A.); (J.R.)
| | - Nico Ruprecht
- Department of BioMedical Research, Experimental Radiology, University of Bern, CH-3008 Bern, Switzerland; (M.H.); (C.K.); (J.T.H.)
- Department of Diagnostic, Interventional and Pediatric Radiology, Bern University Hospital, University of Bern, CH-3010 Bern, Switzerland
| | - Julien Furrer
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland; (V.S.); (O.D.); (T.F.)
| | - Emilia Păunescu
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland; (V.S.); (O.D.); (T.F.)
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Desiatkina O, Păunescu E, Mösching M, Anghel N, Boubaker G, Amdouni Y, Hemphill A, Furrer J. Coumarin-Tagged Dinuclear Trithiolato-Bridged Ruthenium(II)⋅Arene Complexes: Photophysical Properties and Antiparasitic Activity. Chembiochem 2020; 21:2818-2835. [PMID: 32347622 PMCID: PMC7586963 DOI: 10.1002/cbic.202000174] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 04/28/2020] [Indexed: 11/06/2022]
Abstract
The synthesis, characterization, photophysical and biological properties of 13 new conjugate coumarin-diruthenium(II)⋅arene complexes against Toxoplasma gondii are presented. For all conjugate organometallic unit/coumarins, an almost complete loss of fluorescence efficacy was observed. However, the nature of the fluorophore, the type of bonding, the presence and length of a linker between the coumarin dye and the ruthenium(II) moiety, and the number of dye units influenced their biological properties. The in vitro activity against a transgenic T. gondii strain grown in human foreskin fibroblasts (HFF) leads to IC50 values for T. gondii β-gal from 105 to 735 nM. Of note is that nine compounds displayed lower IC50 than the standard drug pyrimethamine. One compound applied at its IC50 did not affect B-cell proliferation but had an impact on T-cell proliferation in murine splenocyte cultures. Transmission electron microscopy of T. gondii β-gal-infected HFF showed that treatment predominantly affected the parasites' mitochondrion.
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Affiliation(s)
- Oksana Desiatkina
- Department of Chemistry and BiochemistryUniversity of BernFreiestrasse 33012BernSwitzerland
| | - Emilia Păunescu
- Department of Chemistry and BiochemistryUniversity of BernFreiestrasse 33012BernSwitzerland
| | - Martin Mösching
- Department of Chemistry and BiochemistryUniversity of BernFreiestrasse 33012BernSwitzerland
| | - Nicoleta Anghel
- Institute of Parasitology Vetsuisse FacultyUniversity of BernLänggass-Strasse 1223012BernSwitzerland
| | - Ghalia Boubaker
- Institute of Parasitology Vetsuisse FacultyUniversity of BernLänggass-Strasse 1223012BernSwitzerland
| | - Yosra Amdouni
- Institute of Parasitology Vetsuisse FacultyUniversity of BernLänggass-Strasse 1223012BernSwitzerland
| | - Andrew Hemphill
- Institute of Parasitology Vetsuisse FacultyUniversity of BernLänggass-Strasse 1223012BernSwitzerland
| | - Julien Furrer
- Department of Chemistry and BiochemistryUniversity of BernFreiestrasse 33012BernSwitzerland
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Primasová H, Ninova S, de Capitani M, Daepp J, Aschauer U, Furrer J. Dinuclear thiolato-bridged arene ruthenium complexes: from reaction conditions and mechanism to synthesis of new complexes. RSC Adv 2020; 10:40106-40116. [PMID: 35520857 PMCID: PMC9057517 DOI: 10.1039/d0ra08146a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 10/21/2020] [Indexed: 11/27/2022] Open
Abstract
Several dinuclear thiophenolato-bridged arene ruthenium complexes [(η6-p-MeC6H4Pri)2Ru2(μ2-SC6H4-R)3]+ (R = H, NO2, F) could so far only be obtained in fair yields using the synthetic route established in the early 2000s. With much less reactive aliphatic thiols or with bulky thiols, the reactions become even less efficient and the desired complexes are obtained with low yields or not at all. We employed density functional theory (DFT) calculations to gain a fundamental understanding of the reaction mechanisms leading to the formation of dithiolato and trithiolato complexes starting from the dichloro(p-cymene)ruthenium(ii) dimer [(η6-p-MeC6H4Pri)Ru(μ2-Cl)Cl]2. The results of the DFT study enabled us to rationalise the experimental results and allowed us, via a modified synthetic route, to synthesise previously unreported and hitherto considered as unrealistic complexes. Our study opens up possibilities for the synthesis of so far inaccessible thiolato-bridged dinuclear arene ruthenium(ii) complexes but more generally, also the synthesis of other thiolato-bridged dinuclear group 8 and 9 metal complexes could be reexamined. We used DFT calculations to understand the reaction mechanisms leading to the formation of dinuclear thiophenolato-bridged arene ruthenium complexes. DFT prompted us to modify the usual synthetic route, which enabled the synthesis of new complexes.![]()
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Affiliation(s)
| | - Silviya Ninova
- Department of Chemistry and Biochemistry
- Universität Bern
- Switzerland
| | | | - Jana Daepp
- Department of Chemistry and Biochemistry
- Universität Bern
- Switzerland
| | - Ulrich Aschauer
- Department of Chemistry and Biochemistry
- Universität Bern
- Switzerland
| | - Julien Furrer
- Department of Chemistry and Biochemistry
- Universität Bern
- Switzerland
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11
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1H HR-MAS NMR-Based Metabolomics of Cancer Cells in Response to Treatment with the Diruthenium Trithiolato Complex [( p-MeC 6H 4iPr) 2Ru 2(SC 6H 4- p-Bu t) 3] + (DiRu-1). Metabolites 2019; 9:metabo9070146. [PMID: 31323867 PMCID: PMC6680816 DOI: 10.3390/metabo9070146] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 01/01/2023] Open
Abstract
The trithiolato bridged diruthenium complex DiRu-1 [(p-MeC6H4iPr)2Ru2(SC6H4-p-But)3]+ is highly cytotoxic against various cancer cell lines, but its exact mode of action remains unknown. The present 1H HR-MAS NMR-based metabolomic study was performed on ovarian cancer cell line A2780, on its cis-Pt resistant variant A2780cisR, and on the cell line HEK-293 treated with 0.03 µM and 0.015 µM of DiRu-1 corresponding to full and half IC50 doses, respectively, to investigate the mode of action of this ruthenium complex. The resulting changes in the metabolic profile of the cell lines were studied using HR-MAS NMR of cell lysates and a subsequent statistical analysis. We show that DiRu-1 in a 0.03 µM dose has significant impact on the levels of a number of metabolites, such as glutamine, glutamate, glutathione, cysteine, lipid, creatine, lactate, and acetate, especially pronounced in the A2780cisR cell line. The IC50/2 dose shows some significant changes, but full IC50 appears to be necessary to observe the full effect. Overall, the metabolic changes observed suggest that redox homeostasis, the Warburg effect, and the lipid metabolism are affected by DiRu-1.
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12
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Păunescu E, Soudani M, Clavel CM, Dyson PJ. Varying the metal to ethacrynic acid ratio in ruthenium(ii)/osmium(ii)-p-cymene conjugates. J Inorg Biochem 2017; 175:198-207. [DOI: 10.1016/j.jinorgbio.2017.07.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/24/2017] [Accepted: 07/26/2017] [Indexed: 01/09/2023]
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13
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Bhowon MG, Jhaumeer-Laulloo S, Moosun S, Humphreys L, Coles S, Fowdram R, Mungra E. Formation and Structural Characterization of Metal Complexes derived from Thiosalicylic Acid. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700244] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Minu G. Bhowon
- Department of Chemistry; University of Mauritius; 80837 Reduit Mauritius
| | | | - Salma Moosun
- Department of Chemistry; University of Mauritius; 80837 Reduit Mauritius
| | - Lisa Humphreys
- Centre for Defence Chemistry; Defence Academy of the United Kingdom; Cranfield University; SN6 8LA Shrivenham UK
| | - Simon Coles
- Chemistry; Faculty of Natural & Environmental Sciences; University of Southampton; SO17 1BJ Southampton UK
| | - Roshni Fowdram
- Department of Chemistry; University of Mauritius; 80837 Reduit Mauritius
| | - Evena Mungra
- Department of Chemistry; University of Mauritius; 80837 Reduit Mauritius
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14
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Stíbal D, Therrien B, Süss-Fink G, Nowak-Sliwinska P, Dyson PJ, Čermáková E, Řezáčová M, Tomšík P. Chlorambucil conjugates of dinuclear p-cymene ruthenium trithiolato complexes: synthesis, characterization and cytotoxicity study in vitro and in vivo. J Biol Inorg Chem 2016; 21:443-52. [PMID: 27040952 DOI: 10.1007/s00775-016-1353-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 03/24/2016] [Indexed: 11/28/2022]
Abstract
Four diruthenium trithiolato chlorambucil conjugates have been prepared via Steglich esterification from chlorambucil and the corresponding trithiolato precursors. All conjugates are highly cytotoxic towards human ovarian A2780 and A2780cisR cancer cell lines with IC50 values in the nanomolar range. The conjugates exhibit selectivity towards A2780 cells as compared to non-cancerous HEK293 cells, while being only slightly selective for RF24 and A2780cisR cells. In vivo, the conjugate [10]BF4 suppressed the growth of a solid Ehrlich tumor in immunocompetent NMRI mice but did not prolong their overall survival. The reactivity of the chlorambucil conjugates with glutathione, a potential target of the dinuclear ruthenium motive, and with the 2-deoxyguanosine 5'-monophosphate (dGMP-a model target of chlorambucil) was studied by mass spectrometry and NMR spectroscopy. The conjugates did not show catalytic activity for the oxidation of glutathione nor binding to nucleotides, indicating that glutathione oxidation and DNA alkylation are not key mechanisms of action. Four highly cytotoxic diruthenium trithiolato chlorambucil conjugates have been prepared. All conjugates exhibit selectivity towards A2780 cells as compared to HEK293 cells, while being only slightly active in RF24 and A2780cisR cells. In vivo, the best candidate suppressed the growth of a solid Ehrlich tumor in immunocompetent NMRI mice but did not prolong their overall survival.
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Affiliation(s)
- David Stíbal
- Institut de Chimie, Université de Neuchâtel, Neuchâtel, Switzerland
| | - Bruno Therrien
- Institut de Chimie, Université de Neuchâtel, Neuchâtel, Switzerland.
| | - Georg Süss-Fink
- Institut de Chimie, Université de Neuchâtel, Neuchâtel, Switzerland
| | - Patrycja Nowak-Sliwinska
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Paul J Dyson
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Eva Čermáková
- Faculty of Medicine in Hradec Králové, Computer Technology Center, Charles University in Prague, Hradec Králové, Czech Republic
| | - Martina Řezáčová
- Faculty of Medicine in Hradec Králové, Department of Medical Biochemistry, Charles University in Prague, Hradec Králové, Czech Republic
| | - Pavel Tomšík
- Faculty of Medicine in Hradec Králové, Department of Medical Biochemistry, Charles University in Prague, Hradec Králové, Czech Republic.
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15
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Furrer J, Süss-Fink G. Thiolato-bridged dinuclear arene ruthenium complexes and their potential as anticancer drugs. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.10.007] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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16
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Adeniyi AA, Ajibade PA. Development of ruthenium-based complexes as anticancer agents: toward a rational design of alternative receptor targets. REV INORG CHEM 2016. [DOI: 10.1515/revic-2015-0008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
AbstractIn the search for novel anticancer agents, the development of metal-based complexes that could serve as alternatives to cisplatin and its derivatives has received considerable attention in recent years. This becomes necessary because, at present, cisplatin and its derivatives are the only coordination complexes being used as anticancer agents in spite of inherent serious side effects and their limitation against metastasized platinum-resistant cancer cells. Although many metal ions have been considered as possible alternatives to cisplatin, the most promising are ruthenium (Ru) complexes and two Ru compounds, KP1019 and NAMI-A, which are currently in phase II clinical trials. The major obstacle against the rational design of these compounds is the fact that their mode of action in relation to their therapeutic activities and selectivity is not fully understood. There is an urgent need to develop novel metal-based anticancer agents, especially Ru-based compounds, with known mechanism of actions, probable targets, and pharmacodynamic activity. In this paper, we review the current efforts in developing metal-based anticancer agents based on promising Ru complexes and the development of compounds targeting receptors and then examine the future prospects.
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