1
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Tóth S, Szlávik MF, Mandel R, Fekecs F, Tusnády G, Vajda F, Varga N, Apáti Á, Bényei A, Paczal A, Kotschy A, Szakács G. Synthesis and Systematic Investigation of Lepidiline A and Its Gold(I), Silver(I), and Copper(I) Complexes Using In Vitro Cancer Models and Multipotent Stem Cells. ACS OMEGA 2024; 9:32226-32234. [PMID: 39072085 PMCID: PMC11270681 DOI: 10.1021/acsomega.4c05020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Revised: 06/24/2024] [Accepted: 06/28/2024] [Indexed: 07/30/2024]
Abstract
The imidazole alkaloid lepidiline A from the root of Lepidium meyenii has a moderate to low in vitro anticancer effect. Our aim was to extend cytotoxicity investigations against a panel of cancer cells, including multidrug-resistant cancer cells, and multipotent stem cells. Lepidiline A is a N-heterocyclic carbene precursor, therefore a suitable ligand source for metal complexes. Thus, we synthesized lepidiline A and its copper(I), gold(I), and silver(I) complexes and tested them against ovarian, gastrointestinal, breast, and uterine cancer cells and bone marrow-derived and adipose-derived mesenchymal stem cells. Lepidiline A and its copper complex demonstrated moderate cytotoxicity, while silver and gold complexes exhibited significantly enhanced and consistent cytotoxicity against both cancer and stem cell lines. ABCB1 in the multidrug-resistant uterine sarcoma line conferred significant resistance against lepidiline A and the copper-lepidiline A complex, but not against the silver and gold complexes. Our results indicate that only the copper complex induced a significant and universal increase in the production of reactive oxygen species within cells. In summary, binding of metal ions to lepidiline A results in enhanced cytotoxicity with the nature of the metal ion playing a critical role in determining its properties.
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Affiliation(s)
- Szilárd Tóth
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Márton F. Szlávik
- Servier
Research Institute of Medicinal Chemistry, Záhony utca 7, Budapest H-1031, Hungary
- Hevesy
György PhD School of Chemistry, Eötvös
Loránd University, Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
| | - Réka Mandel
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Fanni Fekecs
- Servier
Research Institute of Medicinal Chemistry, Záhony utca 7, Budapest H-1031, Hungary
| | - Gábor Tusnády
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Flóra Vajda
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
- Doctoral
School of Molecular Medicine, Semmelweis
University, Budapest H-1089, Hungary
| | - Nóra Varga
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
- Creative
Cell Ltd., Puskas Tivadar
u. 13, Budapest H-1119, Hungary
| | - Ágota Apáti
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Attila Bényei
- Department
of Physical Chemistry, University of Debrecen, Egyetem tér 1, Debrecen H-4032, Hungary
| | - Attila Paczal
- Servier
Research Institute of Medicinal Chemistry, Záhony utca 7, Budapest H-1031, Hungary
| | - András Kotschy
- Servier
Research Institute of Medicinal Chemistry, Záhony utca 7, Budapest H-1031, Hungary
| | - Gergely Szakács
- Institute
of Molecular Life Sciences, HUN-REN Research
Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
- Center
for Cancer Research, Medical University
of Vienna, Spitalgasse 23, Vienna A-1090, Austria
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2
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Knighton RC, Pope SJA. Synthesis and luminescent properties of hetero-bimetallic and hetero-trimetallic Ru(II)/Au(I) or Ir(III)/Au(I) complexes. Dalton Trans 2024; 53:4165-4174. [PMID: 38318847 DOI: 10.1039/d3dt03690a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
A series of Ru(II) and Ir(III) based photoluminescent complexes were synthesised that incorporate an ancillary 2,2'-bipyridine ligand adorned with either one or two pendant N-methyl imidazolium groups. These complexes have been fully characterised by an array of spectroscopic and analytical techniques. One Ir(III) example was unequivocally structurally characterised in the solid state using single crystal X-ray diffraction confirming the proposed formulation and coordination sphere. These complexes were then transformed into their heterometallic, Au(I)-containing, analogues in two steps to yield either bi- or trimetallic complexes that integrate {Au(PPh3)}+ units. X-ray diffraction was used to corroborate the solid state structure of the hetero bimetallic complex, based upon a Ru(II)-Au(I) species. The heterometallic complexes all displayed red photoluminescent features (λem = 616-629 nm) that were consistent with the parent Ru(II) or Ir(III) lumophores in each case. The modulation of the emission from the Ru(II)-Au(I) complexes was much more strongly evident than for the Ir(III)-Au(I) analogues, which is ascribed to the inherent differences in the specific triplet excited state character of the emitting states within each heterometallic species.
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Affiliation(s)
- Richard C Knighton
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
| | - Simon J A Pope
- School of Chemistry, Cardiff University, Main Building, Cardiff, CF10 3AT, UK.
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3
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Winter M, Ellwanger MA, Limberg N, Pérez-Bitrián A, Voßnacker P, Steinhauer S, Riedel S. Reactivity of [AuF 3 (SIMes)]: Pathway to Unprecedented Structural Motifs. Chemistry 2023; 29:e202301684. [PMID: 37340637 DOI: 10.1002/chem.202301684] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/20/2023] [Accepted: 06/20/2023] [Indexed: 06/22/2023]
Abstract
We report on a comprehensive reactivity study starting from [AuF3 (SIMes)] to synthesize different motifs of monomeric gold(III) fluorides. A plethora of different ligands has been introduced in a mono-substitution yielding trans-[AuF2 X(SIMes)] including alkynido, cyanido, azido, and a set of perfluoroalkoxido complexes. The latter were better accomplished via use of perfluorinated carbonyl-bearing molecules, which is unprecedented in gold chemistry. In case of the cyanide and azide, triple substitution gave rise to the corresponding [AuX3 (SIMes)] complexes. Comparison of the chemical shift of the carbene carbon atom in the 13 C{1 H} NMR spectrum, the calculated SIMes affinity and the Au-C bond length in the solid state with related literature-known complexes yields a classification of trans-influences for a variety of ligands attached to the gold center. Therein, the mixed fluorido perfluoroalkoxido complexes have a similar SIMes affinity to AuF3 with a very low Gibbs energy of formation when using the perfluoro carbonyl route.
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Affiliation(s)
- Marlon Winter
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
| | - Mathias A Ellwanger
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, OX1 3QR, Oxford, UK
| | - Niklas Limberg
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
| | - Alberto Pérez-Bitrián
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
| | - Patrick Voßnacker
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
| | - Simon Steinhauer
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
| | - Sebastian Riedel
- Fachbereich Biologie, Chemie, Pharmazie, Institut für Chemie und Biochemie - Anorganische Chemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195, Berlin, Germany
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4
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Kapitza P, Scherfler A, Salcher S, Sopper S, Cziferszky M, Wurst K, Gust R. Reaction Behavior of [1,3-Diethyl-4,5-diphenyl-1 H-imidazol-2-ylidene] Containing Gold(I/III) Complexes against Ingredients of the Cell Culture Medium and the Meaning on the Potential Use for Cancer Eradication Therapy. J Med Chem 2023. [PMID: 37294951 DOI: 10.1021/acs.jmedchem.3c00589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The reactivities of halido[1,3-diethyl-4,5-diphenyl-1H-imidazol-2-ylidene]gold(I) (chlorido (5), bromido (6), iodido (7)), bis[1,3-diethyl-4,5-diphenyl-1H-imidazol-2-ylidene]gold(I) (8), and bis[1,3-diethyl-4,5-diphenyl-1H-imidazol-2-ylidene]dihalidogold(III) (chlorido (9), bromido (10), iodido (11)) complexes against ingredients of the cell culture medium were analyzed by HPLC. The degradation in the RPMI 1640 medium was studied, too. Complex 6 quantitatively reacted with chloride to 5, while 7 showed additionally ligand scrambling to 8. Interactions with non-thiol containing amino acids could not be detected. However, glutathione (GSH) reacted immediately with 5 and 6 yielding the (NHC)gold(I)-GSH complex 12. The most active complex 8 was stable under in vitro conditions and strongly participated on the biological effects of 7. The gold(III) species 9-11 were completely reduced by GSH to 8 and are prodrugs. All complexes were tested for inhibitory effects in Cisplatin-resistant cells, as well as against cancer stem cell-enriched cell lines and showed excellent activity. Such compounds are of utmost interest for the therapy of drug-resistant tumors.
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Affiliation(s)
- Paul Kapitza
- Department of Pharmaceutical Chemistry, Institute of Pharmacy, Center for Molecular Bioscience Innsbruck, University of Innsbruck, Innrain 80/82, Innsbruck A-6020, Austria
| | - Amelie Scherfler
- Department of Pharmaceutical Chemistry, Institute of Pharmacy, Center for Molecular Bioscience Innsbruck, University of Innsbruck, Innrain 80/82, Innsbruck A-6020, Austria
| | - Stefan Salcher
- Department of Internal Medicine V, Haematology & Oncology, Medical University Innsbruck, Anichstrasse 35, Innsbruck A-6020, Austria
| | - Sieghart Sopper
- Department of Internal Medicine V, Haematology & Oncology, Medical University Innsbruck, Anichstrasse 35, Innsbruck A-6020, Austria
| | - Monika Cziferszky
- Department of Pharmaceutical Chemistry, Institute of Pharmacy, Center for Molecular Bioscience Innsbruck, University of Innsbruck, Innrain 80/82, Innsbruck A-6020, Austria
| | - Klaus Wurst
- Department of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80/82, Innsbruck A-6020, Austria
| | - Ronald Gust
- Department of Pharmaceutical Chemistry, Institute of Pharmacy, Center for Molecular Bioscience Innsbruck, University of Innsbruck, Innrain 80/82, Innsbruck A-6020, Austria
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5
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Moreno-Alcántar G, Picchetti P, Casini A. Gold Complexes in Anticancer Therapy: From New Design Principles to Particle-Based Delivery Systems. Angew Chem Int Ed Engl 2023; 62:e202218000. [PMID: 36847211 DOI: 10.1002/anie.202218000] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/26/2023] [Accepted: 02/27/2023] [Indexed: 02/28/2023]
Abstract
The discovery of the medicinal properties of gold complexes has fuelled the design and synthesis of new anticancer metallodrugs, which have received special attention due to their unique modes of action. Current research in the development of gold compounds with therapeutic properties is predominantly focused on the molecular design of drug leads with superior pharmacological activities, e.g., by introducing targeting features. Moreover, intensive research aims at improving the physicochemical properties of gold compounds, such as chemical stability and solubility in the physiological environment. In this regard, the encapsulation of gold compounds in nanocarriers or their chemical grafting onto targeted delivery vectors could lead to new nanomedicines that eventually reach clinical applications. Herein, we provide an overview of the state-of-the-art progress of gold anticancer compounds, andmore importantly we thoroughly revise the development of nanoparticle-based delivery systems for gold chemotherapeutics.
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Affiliation(s)
- Guillermo Moreno-Alcántar
- Chair of Medicinal and Bioinorganic Chemistry, School of Natural Sciences, Department of Chemistry, Technical University of Munich (TUM), Lichtenbergstr. 4, 85748, Garching b. München, Germany
| | - Pierre Picchetti
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Angela Casini
- Chair of Medicinal and Bioinorganic Chemistry, School of Natural Sciences, Department of Chemistry, Technical University of Munich (TUM), Lichtenbergstr. 4, 85748, Garching b. München, Germany
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6
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Lee B, Phillips AD, Hanif M, Söhnel T, Hartinger CG. Triazolyl- vs Pyridyl-Functionalized N-Heterocyclic Carbene Complexes: Impact of the Pendant N-Donor Ligand on Intramolecular C-C Bond Formation. ACS ORGANIC & INORGANIC AU 2022; 2:511-524. [PMID: 36510612 PMCID: PMC9732886 DOI: 10.1021/acsorginorgau.2c00035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/29/2022] [Accepted: 08/29/2022] [Indexed: 12/16/2022]
Abstract
Organometallic Rh(Cp*) (Cp* = η5-pentamethylcyclopentadienyl) complexes with monodentate N-heterocyclic carbene (NHC) ligands bearing a pendant anthracenyl substituent have been shown to undergo intramolecular C-C coupling reactions. Herein, two bidentate NHC ligands substituted with pyridyl or triazolyl donor groups were prepared along with the corresponding MII/III (M = RuII, OsII, RhIII, IrIII) complexes. While the Rh(Cp*) complex featuring an NHC-triazole bidentate ligand underwent the equivalent reaction as the monodentate Rh(NHC) complex, i.e., it formed a polydentate ligand, the pyridyl-pendant derivative was unequivocally shown to be unreactive. This contrasting behavior was further investigated by density functional theory (DFT) calculations that highlighted significant differences between the two types of Rh(III) complexes with pendant pyridyl or triazolyl N-coordinating groups. Modeling of the reaction pathways suggests that the initial formation of a dicationic Rh(III) species is unfavorable and that the internal ligand transformation proceeds first by dissociation of the coordinated N atom of the pendant group from the Rh center. After the formation of a neutral η4-fulvene ligand via combined proton/single electron transfer, a cycloaddition occurs between the exo-ene bond of fulvene and the 9' and 10' positions on the pendant anthracenyl group. The resulting experimental UV-visible spectrum recorded in methanol of the polydentate triazolyl-based Rh species revealed the loss of the vibronic coupling typically associated with an anthracenyl functional group. Moreover, TD-DFT modeling indicates the presence of an equilibrium process whereby the N-coordination of the pendant triazolyl group to the RhIII center appears to be highly labile. Charge decomposition analysis (CDA) of the DFT-modeled species with the dissociated triazolyl group revealed a pseudo-η3-allylic interaction between the π-type MOs of the transformed anthracenyl group and the RhIII center; thus, the singly attached chelating ligand is classified as having rare nonadenticity.
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Affiliation(s)
- Betty
Y.T. Lee
- School
of Chemical Sciences, The University of
Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Andrew D. Phillips
- School
of Chemistry, University College Dublin, Belfield, Dublin 4 D04 V1W8, Ireland,
| | - Muhammad Hanif
- School
of Chemical Sciences, The University of
Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Tilo Söhnel
- School
of Chemical Sciences, The University of
Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Christian G. Hartinger
- School
of Chemical Sciences, The University of
Auckland, Private Bag 92019, Auckland 1142, New Zealand,
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7
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Xiao Q, Liu Y, Jiang G, Liu Y, Huang Y, Liu W, Zhang Z. Heteroleptic Gold(I)-bisNHC complex with excellent activity in vitro, ex vivo and in vivo against endometrial cancer. Eur J Med Chem 2022; 236:114302. [DOI: 10.1016/j.ejmech.2022.114302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 03/08/2022] [Accepted: 03/15/2022] [Indexed: 01/02/2023]
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8
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Al‐Buthabhak HS, Falasca V, Yu Y, Sobolev AN, Skelton BW, Moggach SA, Ferro V, Al‐Salami H, Baker MV. Au‐NHC complexes with thiocarboxylate ligands: synthesis, structure, stability, thiol exchange and
in vitro
anti‐cancer activity. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hawraa S. Al‐Buthabhak
- Department of Chemistry, Faculty of Science University of Kufa Najaf Iraq
- School of Molecular Sciences M310, The University of Western Australia Perth WA Australia
| | - Valerio Falasca
- School of Molecular Sciences M310, The University of Western Australia Perth WA Australia
| | - Yu Yu
- Curtin Medical School, Curtin Health Innovation Research Institute Curtin University Perth WA Australia
- Division of Obstetrics & Gynaecology The University of Western Australia Medical School Perth WA Australia
| | - Alexandre N. Sobolev
- School of Molecular Sciences M310, The University of Western Australia Perth WA Australia
| | - Brian W. Skelton
- School of Molecular Sciences M310, The University of Western Australia Perth WA Australia
| | - Stephen A. Moggach
- School of Molecular Sciences M310, The University of Western Australia Perth WA Australia
| | - Vito Ferro
- School of Chemistry and Molecular Biosciences, The University of Queensland Brisbane, QLD Australia
| | - Hani Al‐Salami
- Biotechnology and Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute Curtin University Perth WA Australia
- Hearing Therapeutics Ear Science Institute Australia Perth Western Australia Australia
| | - Murray V. Baker
- School of Molecular Sciences M310, The University of Western Australia Perth WA Australia
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9
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Goetzfried SK, Kapitza P, Gallati CM, Nindl A, Cziferszky M, Hermann M, Wurst K, Kircher B, Gust R. Investigations of the reactivity, stability and biological activity of halido (NHC)gold(I) complexes. Dalton Trans 2022; 51:1395-1406. [PMID: 34989741 DOI: 10.1039/d1dt03528b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The significance of the halido ligand (Cl-, Br-, I-) in halido[3-ethyl-4-phenyl-5-(2-methoxypyridin-5-yl)-1-propyl-1,3-dihydro-2H-imidazol-2-ylidene]gold(I) complexes (2-4) in terms of ligand exchange reactions, including the ligand scrambling to the bis[3-ethyl-4-phenyl-5-(2-methoxypyridin-5-yl)-1-propyl-1,3-dihydro-2H-imidazol-2-ylidene]gold(I) complex (5), was evaluated by HPLC in acetonitrile/water = 50:50 (v/v) mixtures. In the presence of 0.9% NaCl, the bromido (NHC)gold(I) complex 3 was immediately transformed into the chlorido (NHC)gold(I) complex 2. The iodido (NHC)gold(I) complex 4 converted under the same conditions during 0.5 h of incubation by 52.83% to 2 and by 8.77% to 5. This proportion remained nearly constant for 72 h. The halido (NHC)gold(I) complexes also reacted very rapidly with 1 eq. of model nucleophiles, e.g., iodide or selenocysteine (Sec). For instance, Sec transformed 3 in the proportion 73.03% to the (NHC)Au(I)Sec complex during 5 min of incubation. This high reactivity against this amino acid, present in the active site of the thioredoxin reductase (TrxR), correlates with the complete inhibition of the isolated TrxR enzyme at 1 μM. Interestingly, in cellular systems (A2780cis cells), even at a 5-fold higher concentration, no increased ROS levels were detected. The concentration required for ROS generation was about 20 μM. Superficially considered, the antiproliferative and antimetabolic activities of the halido (NHC)Au(I) complexes correlate with the reactivity of the Au(I)-X bond (2 < 3 < 4). However, it is very likely that degradation products formed during the incubation in cell culture medium participated in the biological activity. In particular, the high-cytotoxic [(NHC)2Au(I)]+ complex (5) distorts the results.
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Affiliation(s)
- Sina Katharina Goetzfried
- Institute of Pharmacy, Department of Pharmaceutical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Paul Kapitza
- Institute of Pharmacy, Department of Pharmaceutical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Caroline Marie Gallati
- Institute of Pharmacy, Department of Pharmaceutical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Anna Nindl
- Department of Internal Medicine V (Hematology and Oncology), Medical University Innsbruck, Anichstraße 35, 6020 Innsbruck, Austria.,Tyrolean Cancer Research Institute, Innrain 66, 6020 Innsbruck, Austria
| | - Monika Cziferszky
- Institute of Pharmacy, Department of Pharmaceutical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Martin Hermann
- Department of Anesthesiology and Critical Care Medicine, Medical University Innsbruck, Anichstraße 35, 6020 Innsbruck, Austria
| | - Klaus Wurst
- Institute for General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria
| | - Brigitte Kircher
- Department of Internal Medicine V (Hematology and Oncology), Medical University Innsbruck, Anichstraße 35, 6020 Innsbruck, Austria.,Tyrolean Cancer Research Institute, Innrain 66, 6020 Innsbruck, Austria
| | - Ronald Gust
- Institute of Pharmacy, Department of Pharmaceutical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
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10
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Mlostoń G, Kowalczyk M, Celeda M, Gach-Janczak K, Janecka A, Jasiński M. Synthesis and Cytotoxic Activity of Lepidilines A-D: Comparison with Some 4,5-Diphenyl Analogues and Related Imidazole-2-thiones. JOURNAL OF NATURAL PRODUCTS 2021; 84:3071-3079. [PMID: 34808062 PMCID: PMC8713287 DOI: 10.1021/acs.jnatprod.1c00797] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Indexed: 05/13/2023]
Abstract
A straightforward access to 2-unsubstituted imidazole N-oxides with subsequent deoxygenation by treatment with Raney-nickel followed by N-benzylation opens up a convenient route to lepidilines A and C. Both imidazolium salts were used to generate in situ the corresponding imidazol-2-ylidenes, which smoothly reacted with elemental sulfur, yielding imidazole-2-thiones. These reactions were performed either under classical conditions in pyridine solutions or mechanochemically using solid Cs2CO3 as a base. The structure of lepidiline C was unambiguously confirmed by X-ray analysis of its hexafluorophosphate. An analogous protocol toward lepidilines B and D and their 4,5-diphenyl analogues is less efficient due to observed instability of the key precursors, i.e., the respective 2-methylimidazole N-oxides. Comparison of cytotoxic activity against HL-60 and MCF-7 cell lines of all lepidilines, as well as their selected structural analogues (e.g., 4,5-diphenyl derivatives and PF6 salts), revealed slightly more potent activity of the 2-methylated series, irrespectively of the type of counterion present in the imidazolium salt. Remarkably, the well-known 1,3-diadamantylimidazolium bromide (the "Arduengo salt"), known as the precursor of the first, shelf-stable NHC representative, and its adamantyloxy analogue displayed the most significant cytotoxic activity in the studied series.
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Affiliation(s)
| | - Mateusz Kowalczyk
- Faculty
of Chemistry, University of Lodz, 91403 Łódź, Poland
- The
Bio-Med-Chem Doctoral School of the University of Lodz and Lodz Institutes
of the Polish Academy of Sciences, Faculty of Biology and Environmental
Protection, University of Lodz, 90237 Łódź, Poland
| | | | | | - Anna Janecka
- Department
of Biomolecular Chemistry, Medical University
of Lodz, 92215 Łódź, Poland
| | - Marcin Jasiński
- Faculty
of Chemistry, University of Lodz, 91403 Łódź, Poland
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11
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Gallati CM, Goetzfried SK, Ortmeier A, Sagasser J, Wurst K, Hermann M, Baecker D, Kircher B, Gust R. Synthesis, characterization and biological activity of bis[3-ethyl-4-aryl-5-(2-methoxypyridin-5-yl)-1-propyl-1,3-dihydro-2H-imidazol-2-ylidene]gold(i) complexes. Dalton Trans 2021; 50:4270-4279. [PMID: 33688890 DOI: 10.1039/d0dt03902k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A series of bis[3-ethyl-4-aryl-5-(2-methoxypyridin-5-yl)-1-propyl-1,3-dihydro-2H-imidazol-2-ylidene]gold(i) complexes (2a-f) containing methyl, fluoro or methoxy substituents at various positions in the 4-aryl ring was synthesized and evaluated for their anti-cancer properties in A2780 (wild-type and Cisplatin-resistant) ovarian carcinoma as well as LAMA 84 (imatinib-sensitive and -resistant) and HL-60 leukemia cell lines. The bis-NHC gold(i) complexes were more active compared to their related mono-NHC gold(i) analogues and reduced proliferation and metabolic activity in a low micromolar range. With the exception of 2d (3-F), the compounds displayed higher potency than the established drugs Auranofin and Cisplatin. The lack of effects against non-cancerous lung fibroblast SV-80 cells indicated a high selectivity towards tumor cells. All tested complexes generated reactive oxygen species in A2780cis cells; however, the induction of apoptosis was very low. Furthermore, thioredoxin reductase is not the main target of these complexes, because its inhibition pattern did not correlate with their biological activity.
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Affiliation(s)
- Caroline Marie Gallati
- Department of Pharmaceutical Chemistry, Institute of Pharmacy, Center for Molecular Biosciences Innsbruck, University of Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria.
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Synthesis, Selected Transformations, and Biological Activity of Alkoxy Analogues of Lepidilines A and C. MATERIALS 2020; 13:ma13184190. [PMID: 32967232 PMCID: PMC7560456 DOI: 10.3390/ma13184190] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/17/2020] [Accepted: 09/17/2020] [Indexed: 12/29/2022]
Abstract
Condensation of diacetyl monooxime with formaldimines derived from alkoxyamines in glacial acetic acid at room temperature leads to corresponding 2-unsubstituted imidazole N-oxides bearing an alkoxy substituent at the N(1) atom of the imidazole ring. Subsequent O-benzylation afforded, depending on the type of alkylating agent, either symmetric or nonsymmetric alkoxyimidazolium salts considered as structural analogues of naturally occurring imidazole alkaloids, lepidilines A and C. Some of the obtained salts were tested as precursors of nucleophilic heterocyclic carbenes (NHCs), which in situ reacted with elemental sulfur to give the corresponding N-alkoxyimidazole-2-thiones. The cytotoxic activity of selected 4,5-dimethylimidazolium salts bearing either two benzyloxy or benzyloxy and 1-adamantyloxy groups at N(1) and N(3) atoms was evaluated against HL-60 and MCF-7 cell lines using the MTT (3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide) assay. Notably, in two cases of alkoxyimidazolium salts, no effect of the counterion exchange (Br- → PF6-) on the biological activity was observed.
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