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Martínez-Alonso M, Jones CG, Shipp JD, Chekulaev D, Bryant HE, Weinstein JA. Phototoxicity of cyclometallated Ir(III) complexes bearing a thio-bis-benzimidazole ligand, and its monodentate analogue, as potential PDT photosensitisers in cancer cell killing. J Biol Inorg Chem 2024; 29:113-125. [PMID: 38183420 PMCID: PMC11001735 DOI: 10.1007/s00775-023-02031-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 10/18/2023] [Indexed: 01/08/2024]
Abstract
Two novel cyclometallated iridium(III) complexes have been prepared with one bidentate or two monodentate imidazole-based ligands, 1 and 2, respectively. The complexes showed intense emission with long lifetimes of the excited state. Femtosecond transient absorption experiments established the nature of the lowest excited state as 3IL state. Singlet oxygen generation with good yields (40% for 1 and 82% for 2) was established by detecting 1O2 directly, through its emission at 1270 nm. Photostability studies were also performed to assess the viability of the complexes as photosensitizers (PS) for photodynamic therapy (PDT). Complex 1 was selected as a good candidate to investigate light-activated killing of cells, whilst complex 2 was found to be toxic in the dark and unstable under light. Complex 1 demonstrated high phototoxicity indexes (PI) in the visible region, PI > 250 after irradiation at 405 nm and PI > 150 at 455 nm, in EJ bladder cancer cells.
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Affiliation(s)
- Marta Martínez-Alonso
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
- Department of Oncology and Metabolism, Medical School, The University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK
| | - Callum G Jones
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
- Department of Oncology and Metabolism, Medical School, The University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK
| | - James D Shipp
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | - Dimitri Chekulaev
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | - Helen E Bryant
- Department of Oncology and Metabolism, Medical School, The University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK.
| | - Julia A Weinstein
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK.
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2
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Negi M, Dixit T, Venkatesh V. Ligand Dictated Photosensitization of Iridium(III) Dithiocarbamate Complexes for Photodynamic Therapy. Inorg Chem 2023; 62:20080-20095. [PMID: 37994001 DOI: 10.1021/acs.inorgchem.3c02942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
Organelle-targeted photosensitizers (PSs) for photodynamic therapy (PDT) are considered as an effective therapeutic strategy for the development of next generation PSs with the least side effects and high therapeutic efficacy. However, multiorganelle targeted PSs eliciting PDT via both type I and type II mechanisms are scarce. Herein, a series of cyclometalated iridium(III) complexes were formulated [Ir(C∧N)2(S∧S)] (C∧N = 2-phenylpyridine (ppy) and 2-(thiophen-2-yl)pyridine (thpy); S∧S = diethyldithiocarbamate (DEDTC), morpholine-N-dithiocarbamate (MORDTC) and methoxycarbonodithioate (MEDTC)) and the newly designed complexes Ir2@DEDTC and Ir1@MEDTC were characterized by single crystal X-ray crystallography. Complexes containing thpy as C∧N ligand exhibit excellent photophysical properties such as red-shifted emission, high singlet oxygen quantum yield (ϕΔ) and longer photoluminescence lifetime when compared with complexes containing ppy ligands. Ir2@DEDTC exhibits the highest ϕΔ and photoluminescence lifetimes among the synthesized complexes. Therefore, Ir2@DEDTC was chosen to evaluate the photosensitizing ability to produce reactive oxygen species (ROS). Upon blue light irradiation (456 nm), it efficiently produces ROS, i.e., hydroxy radical (•OH) and singlet oxygen (1O2), which was confirmed by electron paramagnetic resonance (EPR) spectroscopy. In vitro photocytotoxicity toward HCT116, HeLa, and PC3 cell lines showed that out of all the synthesized complexes, Ir2@DEDTC has the highest photocytotoxic index (PI > 400) value. Ir2@DEDTC is efficiently taken up by the HCT116 cell line and accumulated mainly in the lysosome and mitochondria of the cells, and after PDT treatment, it elicits cell shrinkage, membrane blebbing, and DNA fragmentation. The phototherapeutic efficacy of Ir2@DEDTC has been investigated against 3D spheroids considering its ability to mimic some of the basic features of solid tumors. The morphology was drastically altered in the Ir2@DEDTC treated 3D spheroid after the light irradiation unleashed the potential of the Ir(III) dithiocarbamate complex as a superior PS for PDT. Hence, mitochondria and lysosome targeted photoactive cyclometalated Ir(III) dithiocarbamate complex exerting oxidative stress via both type I and type II PDT can be regarded as a dual-organelle targeted two-pronged approach for enhanced PDT.
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Affiliation(s)
- Monika Negi
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
| | - Tejal Dixit
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
| | - V Venkatesh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
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3
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Das U, Paira P. Synthesis, characterization, photophysical and electrochemical properties, and biomolecular interaction of 2,2'-biquinoline based phototoxic Ru(II)/Ir(II) complexes. Dalton Trans 2023; 52:12608-12617. [PMID: 37314097 DOI: 10.1039/d3dt01348k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The phototoxic nature of drugs has been seen to convey immense importance in photo activated chemotherapy (PACT) for the selective treatment of disease. Rationally, in order to eradicate the vehemence of cancer in a living body, the design of phototoxic molecules has been of growing interest in research to establish a selective strategy for cancer therapy. Therefore, the present work portrays the synthesis of a phototoxic anticancer agent by incorporating ruthenium(II) and iridium(III) metals into a biologically active 2,2'-biquinoline moiety, BQ. The complexes, RuBQ and IrBQ, have been revealed as effective anticancer agents with remarkable toxicity in the presence of light compared to the dark towards HeLa and MCF-7 cancer cell lines due to the production of a profuse amount of singlet oxygen (1O2) upon irradiation by visible light (400-700 nm). Complex IrBQ exhibited the best toxicity (IC50 = 8.75 μM in MCF-7 and 7.23 μM in HeLa) in comparison to the RuBQ complex under visible light. RuBQ and IrBQ displayed considerable quantum yields (Φf) along with a good lipophilic property, indicating the cellular imaging capability of both complexes upon significant accumulation in cancer cells. Also, the complexes have shown significant binding propensity with biomolecules, viz. deoxyribonucleic acid (DNA) as well as serum albumin (BSA, HSA).
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Affiliation(s)
- Utpal Das
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014, Tamilnadu, India.
| | - Priyankar Paira
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014, Tamilnadu, India.
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4
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Li SR, Tan YM, Zhang L, Zhou CH. Comprehensive Insights into Medicinal Research on Imidazole-Based Supramolecular Complexes. Pharmaceutics 2023; 15:pharmaceutics15051348. [PMID: 37242590 DOI: 10.3390/pharmaceutics15051348] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/20/2023] [Accepted: 04/24/2023] [Indexed: 05/28/2023] Open
Abstract
The electron-rich five-membered aromatic aza-heterocyclic imidazole, which contains two nitrogen atoms, is an important functional fragment widely present in a large number of biomolecules and medicinal drugs; its unique structure is beneficial to easily bind with various inorganic or organic ions and molecules through noncovalent interactions to form a variety of supramolecular complexes with broad medicinal potential, which is being paid an increasing amount of attention regarding more and more contributions to imidazole-based supramolecular complexes for possible medicinal application. This work gives systematical and comprehensive insights into medicinal research on imidazole-based supramolecular complexes, including anticancer, antibacterial, antifungal, antiparasitic, antidiabetic, antihypertensive, and anti-inflammatory aspects as well as ion receptors, imaging agents, and pathologic probes. The new trend of the foreseeable research in the near future toward imidazole-based supramolecular medicinal chemistry is also prospected. It is hoped that this work provides beneficial help for the rational design of imidazole-based drug molecules and supramolecular medicinal agents and more effective diagnostic agents and pathological probes.
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Affiliation(s)
- Shu-Rui Li
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Yi-Min Tan
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Ling Zhang
- School of Chemical Technology, Shijiazhuang University, Shijiazhuang 050035, China
| | - Cheng-He Zhou
- Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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5
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Quílez-Alburquerque J, Saad MA, Descalzo AB, Orellana G, Hasan T. Hyaluronic acid-poly(lactic-co-glycolic acid) nanoparticles with a ruthenium photosensitizer cargo for photokilling of oral cancer cells. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2022.114349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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6
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Wang X, Zhang C, Madji R, Voros C, Mazères S, Bijani C, Deraeve C, Cuvillier O, Gornitzka H, Maddelein ML, Hemmert C. N-Heterocyclic Carbene-Iridium Complexes as Photosensitizers for In Vitro Photodynamic Therapy to Trigger Non-Apoptotic Cell Death in Cancer Cells. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020691. [PMID: 36677751 PMCID: PMC9861386 DOI: 10.3390/molecules28020691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/02/2023] [Accepted: 01/03/2023] [Indexed: 01/13/2023]
Abstract
A series of seven novel iridium complexes were synthetized and characterized as potential photosensitizers for photodynamic therapy (PDT) applications. Among them, four complexes were evaluated in vitro for their anti-proliferative activity with and without irradiation on a panel of five cancer cell lines, namely PC-3 (prostate cancer), T24 (bladder cancer), MCF7 (breast cancer), A549 (lung cancer) and HeLa (cervix cancer), and two non-cancerous cell models (NIH-3T3 fibroblasts and MC3T3 osteoblasts). After irradiation at 458 nm, all tested complexes showed a strong selectivity against cancer cells, with a selectivity index (SI) ranging from 8 to 34 compared with non-cancerous cells. The cytotoxic effect of all these complexes was found to be independent of the anti-apoptotic protein Bcl-xL. The compound exhibiting the best selectivity, complex 4a, was selected for further investigations. Complex 4a was mainly localized in the mitochondria. We found that the loss of cell viability and the decrease in ATP and GSH content induced by complex 4a were independent of both Bcl-xL and caspase activation, leading to a non-apoptotic cell death. By counteracting the intrinsic or acquired resistance to apoptosis associated with cancer, complex 4a could be an interesting therapeutic alternative to be studied in preclinical models.
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Affiliation(s)
- Xing Wang
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Chen Zhang
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Ryma Madji
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Camille Voros
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Serge Mazères
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Christian Bijani
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Céline Deraeve
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
| | - Olivier Cuvillier
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Correspondence: (O.C.); (H.G.); (M.-L.M.); (C.H.)
| | - Heinz Gornitzka
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Correspondence: (O.C.); (H.G.); (M.-L.M.); (C.H.)
| | - Marie-Lise Maddelein
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Correspondence: (O.C.); (H.G.); (M.-L.M.); (C.H.)
| | - Catherine Hemmert
- Coordination Chemistry Laboratory of the National Centre for Scientific Research (LCC-CNRS), University of Toulouse, CNRS, Université Toulouse III–Paul Sabatier (UPS), 31077 Toulouse, France
- Correspondence: (O.C.); (H.G.); (M.-L.M.); (C.H.)
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7
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Ortega-Forte E, Hernández-García S, Vigueras G, Henarejos-Escudero P, Cutillas N, Ruiz J, Gandía-Herrero F. Potent anticancer activity of a novel iridium metallodrug via oncosis. Cell Mol Life Sci 2022; 79:510. [PMID: 36066676 PMCID: PMC9448686 DOI: 10.1007/s00018-022-04526-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/27/2022] [Accepted: 08/10/2022] [Indexed: 11/25/2022]
Abstract
Oncosis (from Greek ónkos, meaning "swelling") is a non-apoptotic cell death process related to energy depletion. In contrast to apoptosis, which is the main form of cell death induced by anticancer drugs, oncosis has been relatively less explored but holds potential to overcome drug resistance phenomena. In this study, we report a novel rationally designed mitochondria-targeted iridium(III) complex (OncoIr3) with advantageous properties as a bioimaging agent. OncoIr3 exhibited potent anticancer activity in vitro against cancer cells and displayed low toxicity to normal dividing cells. Flow cytometry and fluorescence-based assays confirmed an apoptosis-independent mechanism involving energy depletion, mitochondrial dysfunction and cellular swelling that matched with the oncotic process. Furthermore, a Caenorhabditis elegans tumoral model was developed to test this compound in vivo, which allowed us to prove a strong oncosis-derived antitumor activity in animals (with a 41% reduction of tumor area). Indeed, OncoIr3 was non-toxic to the nematodes and extended their mean lifespan by 18%. Altogether, these findings might shed new light on the development of anticancer metallodrugs with non-conventional modes of action such as oncosis, which could be of particular interest for the treatment of apoptosis-resistant cancers.
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Affiliation(s)
- Enrique Ortega-Forte
- Departamento de Química Inorgánica, Universidad de Murcia, and Murcia BioHealth Research Institute (IMIB-Arrixaca), 30071 Murcia, Spain
| | - Samanta Hernández-García
- Departamento de Bioquímica y Biología Molecular A. Unidad Docente de Biología, Facultad de Veterinaria, Universidad de Murcia, 30071 Murcia, Spain
| | - Gloria Vigueras
- Departamento de Química Inorgánica, Universidad de Murcia, and Murcia BioHealth Research Institute (IMIB-Arrixaca), 30071 Murcia, Spain
| | - Paula Henarejos-Escudero
- Departamento de Bioquímica y Biología Molecular A. Unidad Docente de Biología, Facultad de Veterinaria, Universidad de Murcia, 30071 Murcia, Spain
| | - Natalia Cutillas
- Departamento de Química Inorgánica, Universidad de Murcia, and Murcia BioHealth Research Institute (IMIB-Arrixaca), 30071 Murcia, Spain
| | - José Ruiz
- Departamento de Química Inorgánica, Universidad de Murcia, and Murcia BioHealth Research Institute (IMIB-Arrixaca), 30071 Murcia, Spain
| | - Fernando Gandía-Herrero
- Departamento de Bioquímica y Biología Molecular A. Unidad Docente de Biología, Facultad de Veterinaria, Universidad de Murcia, 30071 Murcia, Spain
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8
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Lyu J, Liu D, Wang C, Zhang Z, Zhang X. Halogen-bridged binuclear iridium(III) complexes with enhanced photodynamic therapeutic effects in mitochondria. J Mater Chem B 2022; 10:6307-6314. [PMID: 35916051 DOI: 10.1039/d2tb01078j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The development of high-performance photosensitizers is the top priority in photodynamic therapy (PDT). Iridium complexes are widely used because of their many advantages such as high photostability, long T1 lifetime, high yield of singlet oxygen generation, and so on. Halogen-bridged binuclear complexes are often used as intermediates in the synthesis of photosensitizers but ignored in PDT applications. Here we found that halogen-bridged binuclear iridium complexes showed excellent performance in 1O2 generation. It was also confirmed that these complexes kill tumor cells by inducing apoptosis. Through molecular design and modification, we studied the effect of the bridging halogen atoms and intracellular localization on the performance of PDT. The results show that replacing the bridging halogen with heavier atoms and targeting the complex in mitochondria can effectively enhance the efficiency of PDT. Among them, the bromine bridged binuclear iridium complex located in mitochondria reported in this paper can achieve an IC50 value of 75 nM for MCF-7 cells. This work also provides inspiration for the exploration of complex-based photosensitizers.
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Affiliation(s)
- Jinxiao Lyu
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Macau SAR, 999078, China.
| | - Dongcheng Liu
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Macau SAR, 999078, China. .,School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Chunfei Wang
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Macau SAR, 999078, China.
| | - Zhao Zhang
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Macau SAR, 999078, China.
| | - Xuanjun Zhang
- Cancer Centre and Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, Macau SAR, 999078, China. .,MOE Frontiers Science Center for Precision Oncology, University of Macau, Macau SAR, 999078, China
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9
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Liu L, Chen J, Wang MM, Huang Y, Qian Y, Xue X, Su Z, Liu HK. The cyclometalated iridium (III) complex based on 9-Anthracenecarboxylic acid as a lysosomal-targeted anticancer agent. J Inorg Biochem 2022; 235:111913. [PMID: 35905643 DOI: 10.1016/j.jinorgbio.2022.111913] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 06/18/2022] [Accepted: 07/03/2022] [Indexed: 12/26/2022]
Abstract
9-Anthracenecarboxylic acid (9-Ac) was reported early as a chloride channel inhibitor and was found to exhibit significant anti-proliferative activity on leukemic cells, but has not been researched in solid tumor cells. Herein, a 9-anthraceneic acid derivative was introduced into the cyclometalated Iridium (III) species to construct a novel Iridium (Ir) complex Ir-9-Ac, [Ir(ppy)2(9-Ac-L)]PF6 (ppy = 2-phenylpyridine, 9-Ac-L = N-((4'-methyl-[2,2'-bipyridin]-4-yl)methyl)anthracene-9-carboxamide), which could accumulated in lysosomes. Ir-9-Ac showed good cytotoxic activity against several tumor cell lines, notably on A549 cells. Besides Ir-9-Ac could inhibit the cell colony formation and growth of the 3D cell spheroids, demonstrating the potential to suppress tumors in vivo. This design provided a platform for the design of cyclometalated Iridium (III) anticancer complexes.
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Affiliation(s)
- Lu Liu
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Jun Chen
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Meng-Meng Wang
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Yuanlei Huang
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Yong Qian
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Xuling Xue
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
| | - Zhi Su
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
| | - Hong-Ke Liu
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
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10
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Rational design of mitochondria targeted thiabendazole-based Ir(III) biscyclometalated complexes for a multimodal photodynamic therapy of cancer. J Inorg Biochem 2022; 231:111790. [DOI: 10.1016/j.jinorgbio.2022.111790] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 02/25/2022] [Accepted: 03/07/2022] [Indexed: 12/13/2022]
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11
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Wang R, Li X, Yoon J. Organelle-Targeted Photosensitizers for Precision Photodynamic Therapy. ACS APPLIED MATERIALS & INTERFACES 2021; 13:19543-19571. [PMID: 33900741 DOI: 10.1021/acsami.1c02019] [Citation(s) in RCA: 119] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Subcellular organelles are the cornerstones of cells, and destroying them will cause cell dysfunction and even death. Therefore, realizing precise organelle targeting of photosensitizers (PSs) can help reduce PS dosage, minimize side effects, avoid drug resistance, and enhance therapeutic efficacy in photodynamic therapy (PDT). Organelle-targeted PSs provide a new paradigm for the construction of the next generation of PSs and may provide implementable strategies for future precision medicine. In this Review, the recent targeting strategies of different organelles and the corresponding design principles of molecular and nanostructured PSs are summarized and discussed. The current challenges and opportunities in organelle-targeted PDT are also presented.
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Affiliation(s)
- Rui Wang
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Xingshu Li
- College of Chemistry, State Key Laboratory of Photocatalysis for Energy and the Environment, Fujian Provincial Key Laboratory for Cancer Metastasis Chemoprevention and Chemotherapy, Fuzhou University, Fuzhou 350108, China
| | - Juyoung Yoon
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
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12
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Lu C, Xu W, Shah H, Liu B, Xu W, Sun L, Qian SY, Sun W. In Vitro Photodynamic Therapy of Mononuclear and Dinuclear Iridium(III) Bis(terpyridine) Complexes. ACS APPLIED BIO MATERIALS 2020; 3:6865-6875. [PMID: 35019348 DOI: 10.1021/acsabm.0c00784] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Three mononuclear or dinuclear bis(terpyridine) (tpy) iridium(III) complexes bearing pyren-1-yl (pyr) group(s) were synthesized. Their photophysical properties in water and in vitro photodynamic therapy (PDT) effects toward the human lung epithelial cancer cell line A549 and the human epidermal skin cancer cell line A431 were investigated to evaluate the effects of dinuclear versus mononuclear complexes and the impact of the oligoether substituent at the ligand. All complexes possessed pyr-tpy ligand-associated charge transfer (1CT)/1π,π* absorption bands at 350-550 nm, with the dinuclear complex Ir3 showing the much enhanced absorptivity of this band. These complexes exhibited dual emission upon excitation at >430 nm in most cases, with the emitting states being ascribed to 1ILCT (intraligand charge transfer) and 3π,π*/3CT states, respectively. All complexes exhibited relatively weak to moderate cytotoxicity in the dark but high photocytotoxicity upon broadband visible light irradiation. Among them, the dinuclear complex Ir3 showed the highest intracellular reactive oxygen species (ROS) generation and PDT efficiency compared to its mononuclear counterpart Ir1. Introducing an oligoether substituent on one of the tpy ligands in Ir2 also improved its intracellular ROS generation and PDT efficacy compared to those induced by Ir1. Ir3 induced both mitochondrial dysfunction and lysosomal damage upon light activation toward both cell lines, whereas Ir1 and Ir2 caused both mitochondrial dysfunction and lysosomal damage in A431 cells but only lysosomal damage in A549 cells. The dominant cell death pathway induced by Ir1-Ir3 PDT is apoptosis.
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Affiliation(s)
- Cuifen Lu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States.,Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, P. R. China
| | - Wan Xu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Harshit Shah
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Bingqing Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Wei Xu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Liya Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Steven Y Qian
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
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Li J, Chen T. Transition metal complexes as photosensitizers for integrated cancer theranostic applications. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213355] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Lu H, Jiang X, Chen Y, Peng K, Huang Y, Zhao H, Chen Q, Lv F, Liu L, Wang S, Ma Y. Cyclometalated iridium(iii) complex nanoparticles for mitochondria-targeted photodynamic therapy. NANOSCALE 2020; 12:14061-14067. [PMID: 32582896 DOI: 10.1039/d0nr03398g] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Cyclometalated Ir(iii) complexes, with a long triplet state lifetime and good photophysical properties, are good candidates for simultaneous imaging and photodynamic therapy (PDT). Herein, we synthesize a cyclometalated Ir(iii) complex, Ir(tiq)2ppy, whose triplet excited state lifetime is 2.9 μs and singlet oxygen generation quantum yield is approximately 100% (compared to tetraphenylporphyrin). Ir(tiq)2ppy nanoparticles (Ir(tiq)2ppy NPs) are prepared to achieve water solubility and mitochondria-targeting ability by co-precipitating with polystyrene grafted with carboxyl-terminated poly(ethylene glycol) (PS-PEG). Ir(tiq)2ppy NPs have higher PDT efficiency than Ir(tiq)2ppy at concentrations as low as 1.6 μg mL-1 for MCF-7 breast cancer cells under white light irradiation at quite low light intensity (5 mW cm-2). Besides, it is worth noting that the emission quenching of Ir(tiq)2ppy in aqueous solution has been conquered by using Ir(tiq)2ppy NPs, thus the distribution of the therapeutic agents in mitochondria can be tracked by confocal laser scanning microscopy (CLSM). The mechanism of killing cancer cells under irradiation is investigated, and the results indicate that cell death is caused by mitochondria-mediated apoptosis, which is induced by the ROS generated under light irradiation.
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Affiliation(s)
- Huan Lu
- Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Lab of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry, Peking University, Beijing, 100871, P. R. China.
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Liu B, Monro S, Jabed MA, Cameron CG, Colón KL, Xu W, Kilina S, McFarland SA, Sun W. Neutral iridium(iii) complexes bearing BODIPY-substituted N-heterocyclic carbene (NHC) ligands: synthesis, photophysics, in vitro theranostic photodynamic therapy, and antimicrobial activity. Photochem Photobiol Sci 2019; 18:2381-2396. [PMID: 31432864 PMCID: PMC6785369 DOI: 10.1039/c9pp00142e] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 08/08/2019] [Indexed: 12/29/2022]
Abstract
The synthesis, photophysics, and photobiological activities of a series of novel neutral heteroleptic cyclometalated iridium(iii) complexes incorporating boron dipyrromethene (BODIPY) substituted N-heterocyclic carbene (NHC) ligands (Ir1-Ir5) are reported. The effect of the substitution position of BODIPY on the NHC ligands, either on C4 of the phenyl ring (Ir1-Ir3) or C5 of the benzimidazole unit (Ir4 and Ir5), and its linker type (single or triple bond) on the photophysical properties was studied. Ir1-Ir5 exhibited BODIPY-localized intense 1IL (intraligand transition)/1MLCT (metal-to-ligand charge transfer) absorption at 530-543 nm and 1,3IL/1,3CT (charge transfer) emission at 582-610 nm. The nanosecond transient absorption results revealed that the lowest triplet excited states of these complexes were the BODIPY-localized 3π,π* states. Complexes Ir4 and Ir5 exhibited blue-shifted 1IL absorption and 1,3IL/1,3CT emission bands compared to the corresponding absorption and emission bands in complexes Ir1 and Ir3. However, replacing the methyl substituents on N3 of benzimidazole in complexes Ir1 and Ir4 with oligoether substituents in Ir3 and Ir5, respectively, did not impact the energies of the low-energy absorption and emission bands in the corresponding complexes. Water-soluble complexes Ir3 and Ir5 have been explored as photosensitizers for in vitro photodynamic therapy (PDT) effects toward human SKMEL28 melanoma cells. Ir3 showed no dark cytotoxicity (EC50 > 300 μM) but good photocytotoxic activity (9.66 ± 0.28 μM), whereas Ir5 exhibited a higher dark cytotoxicity (20.2 ± 1.26 μM) and excellent photocytotoxicity (0.15 ± 0.01 μM). The phototherapeutic indices with visible light (400-700 nm) activation were >31 for Ir3 and 135 for Ir5. Ir3 and Ir5 displayed 1O2 quantum yields of 38% and 22% in CH3CN, respectively, upon 450 nm excitation. Ir5 was more effective at generating reactive oxygen species (ROS) in vitro. Ir5 was also active against Staphylococcus aureus upon visible light activation, with a phototherapeutic index of >15 and EC50 value of 6.67 μM. These photobiological activities demonstrated that these neutral Ir(iii) complexes are promising in vitro PDT reagents, and substitution at C5 on the benzimidazole group of the NHC ligand was superior to C4 substitution on the phenyl ring.
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Affiliation(s)
- Bingqing Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA.
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Liu B, Monro S, Li Z, Jabed MA, Ramirez D, Cameron CG, Colón K, Roque J, Kilina S, Tian J, McFarland SA, Sun W. A New Class of Homoleptic and Heteroleptic Bis(terpyridine) Iridium(III) Complexes with Strong Photodynamic Therapy Effects. ACS APPLIED BIO MATERIALS 2019; 2:2964-2977. [PMID: 31844844 PMCID: PMC6913535 DOI: 10.1021/acsabm.9b00312] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Six homo- or heteroleptic tricationic Ir(R1-tpy)(R2-tpy)3+ complexes (Ir1-Ir6, R1/R2 = Ph, 4'-N(CH3)2Ph, pyren-1-yl, or 4'-{2-[2-(2-methoxyethoxy)ethoxy]ethoxy}Ph, tpy = 2,2';6',2"-terpyridine) were synthesized and tested for photodynamic therapy (PDT) effects. The ground- and excited-state characteristics of these complexes were studied systematically via spectroscopic methods and quantum chemistry calculations. All complexes possessed intraligand charge transfer (1ILCT) / metal-to-ligand charge transfer (1MLCT) dominated transition(s) in their low-energy absorption bands, which red-shifted with the increased electron-releasing strength of the R1/R2 substituent. Five of the complexes exhibited ligand-centered 3 π,π*/3ILCT/3MLCT emission. With a stronger electron-releasing R1/R2 substituent, the degree of charge transfer contribution increased, leading to a decrease of the emission quantum yield. When the 4'-N(CH3)2Ph substituent was introduced on both tpy ligands, the emission of Ir3 was completely quenched. Our study on the transient absorption of these complexes demonstrated that they all possessed broadband triplet excited-state absorption in the 400-800 nm region. Pyrenyl substitution of one or more tpy ligands, as in Ir4 and Ir5, increased the lifetimes of the lowest triplet excited state and the singlet oxygen (1O2) production efficiencies. Ir1-Ir5 were nontoxic toward SK-MEL-28 cells, with photocytotoxicities that varied from 0.18 to 153 µM. Among them, Ir4 had the highest 1O2 quantum yield (0.81) in cell-free conditions, showing the largest photocytotoxicity against SK-MEL-28 cells for Ir(III) PSs to date, and was the most efficient generator of reactive oxygen species (ROS) in vitro. Ir4 possessed a very large phototherapeutic index (PI = dark EC50 / light EC50) of >1657, the largest reported for an Ir(III) complex photosensitizer upon broadband visible light (400-700 nm) activation. Ir4 also exhibited a very strong PDT effect toward MCF-7 breast cancer cells and its xenograft tumor model. Upon 450-nm light activation, Ir4 dramatically inhibited the xenograft tumor growth and exhibited negligible side effects upon PDT treatment.
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Affiliation(s)
- Bingqing Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108–6050, USA
| | - Susan Monro
- Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, NS B4P 2R6, Canada
| | - Zhike Li
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Hubei Province Engineering and Technology Research Center for Fluorinated Pharmaceuticals, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, P. R. China
| | - Mohammed A. Jabed
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108–6050, USA
| | - Daniel Ramirez
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108–6050, USA
| | - Colin G. Cameron
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402–6170, USA
| | - Katsuya Colón
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402–6170, USA
| | - John Roque
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402–6170, USA
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108–6050, USA
| | - Jian Tian
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Hubei Province Engineering and Technology Research Center for Fluorinated Pharmaceuticals, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, P. R. China
| | - Sherri A. McFarland
- Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, NS B4P 2R6, Canada
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402–6170, USA
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108–6050, USA
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Chen MH, Zheng Y, Cai XJ, Zhang H, Wang FX, Tan CP, Chen WH, Ji LN, Mao ZW. Inhibition of autophagic flux by cyclometalated iridium(iii) complexes through anion transportation. Chem Sci 2019; 10:3315-3323. [PMID: 30996918 PMCID: PMC6428141 DOI: 10.1039/c8sc04520h] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 01/28/2019] [Indexed: 12/14/2022] Open
Abstract
We report two phosphorescent cyclometalated iridium(iii) complexes that can inhibit autophagic flux through anion transportation.
Synthetic anion transporters that can interfere with the intracellular pH homeostasis are gaining increasing attention for tumor therapy, however, the biological mechanism of anion transporters remains to be explored. In this work, two phosphorescent cyclometalated Ir(iii) complexes containing 2-phenylpyridine (ppy) as the cyclometalated ligand, and 2,2′-biimidazole (H2biim, Ir1) or 2-(1H-imidazol-2-yl)pyridine (Hpyim, Ir2) as the ancillary ligands have been synthesized and characterized. Due to the protonation and deprotonation process of the N–H groups on H2biim and Hpyim, Ir1 and Ir2 display pH-dependent phosphorescence and can specifically image lysosomes. Both Ir1 and Ir2 can act as anion transporters mainly through the anion exchange mechanism with higher potency observed for Ir1. Mechanism investigation shows that Ir1 and Ir2 can induce caspase-independent cell death through reactive oxygen species (ROS) elevation. As Ir1 and Ir2 can alkalinize lysosomes through anion disturbance, they can inhibit autophagic flux. Our work provides a novel anticancer mechanism of metal complexes, which gives insights into the innovative structure-based design of new metallo-anticancer agents.
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Affiliation(s)
- Mu-He Chen
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
| | - Yue Zheng
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
| | - Xiong-Jie Cai
- Guangdong Provincial Key Laboratory of New Drug Screening , School of Pharmaceutical Sciences , Southern Medical University , Guangzhou 510515 , P. R. China .
| | - Hang Zhang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
| | - Fang-Xin Wang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
| | - Cai-Ping Tan
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
| | - Wen-Hua Chen
- Guangdong Provincial Key Laboratory of New Drug Screening , School of Pharmaceutical Sciences , Southern Medical University , Guangzhou 510515 , P. R. China .
| | - Liang-Nian Ji
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
| | - Zong-Wan Mao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China . ;
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Zhu M, Jia Z, Qu Y, Qi Z, Zhao H, Wang N, Xing J, Liu J, Gao E. Four Ni(II), Co(III), Cd(II) complexes based on 5-(pyrazol-1-yl)nicotinic acid: synthesis, X-ray single crystal structure, in vitro cytotoxicity, apoptosis and molecular docking studies. J COORD CHEM 2019. [DOI: 10.1080/00958972.2018.1564911] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Mingchang Zhu
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Zhili Jia
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Yun Qu
- Department of Oncology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Zhenzhen Qi
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Hongwei Zhao
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Ning Wang
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Jialing Xing
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Jiaxing Liu
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
| | - Enjun Gao
- International Key Laboratory of Liaoning Inorganic Molecule-Based Chemical and Department of Coordination Chemistry, Shenyang University of Chemical Technology, Shenyang, China
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Martínez-Alonso M, Busto N, Aguirre LD, Berlanga L, Carrión MC, Cuevas JV, Rodríguez AM, Carbayo A, Manzano BR, Ortí E, Jalón FA, García B, Espino G. Strong Influence of the Ancillary Ligand over the Photodynamic Anticancer Properties of Neutral Biscyclometalated Ir III Complexes Bearing 2-Benzoazole-Phenolates. Chemistry 2018; 24:17523-17537. [PMID: 30176086 DOI: 10.1002/chem.201803784] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Indexed: 12/12/2022]
Abstract
In this paper, the synthesis, comprehensive characterization and biological and photocatalytic properties of two series of neutral IrIII biscyclometalated complexes of general formula [Ir(C^N)2 (N^O)], where the N^O ligands are 2-(benzimidazolyl)phenolate-N,O (L1, series a) and 2-(benzothiazolyl)phenolate-N,O (L2, series b), and the C^N ligands are 2-(phenyl)pyridinate or its derivatives, are described,. Complexes of types a and b exhibit dissimilar photophysical and biological properties. In vitro cytotoxicity tests conclusively prove that derivatives of series a are harmless in the dark against SW480 cancer cells (colon adenocarcinoma), but express enhanced cytotoxicity versus the same cells after stimulation with UV or blue light. In contrast, complexes of type b show a very high cytotoxic activity in the dark, but low photosensitizing ability. Thus, the ancillary N^O ligand is the main factor in terms of cytotoxic activity both in the dark and upon irradiation. However, the C^N ligands play a key role regarding cellular uptake. In particular, the complex of formula [Ir(dfppy)2 (L1)] (dfppy=2-(4,6-difluorophenyl)pyridinate) [3 a] has been identified as both an efficient photosensitizer for 1 O2 generation and a potential agent for photodynamic therapy. These capabilities are probably related to a combination of its notable cellular internalization, remarkable photostability, high photoluminescence quantum yield, and long triplet excited-state lifetime. Both types of complexes exhibit notable catalytic activity in the photooxidation of thioanisole and S-containing aminoacids with full selectivity.
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Affiliation(s)
- Marta Martínez-Alonso
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
| | - Natalia Busto
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
| | - Larry Danilo Aguirre
- Facultad de Ingeniería EléctricayElectrónica, Universidad Nacional de Ingeniería, Av. Túpac Amaru 210, PE-LIMA, 025, Lima, Perú
| | - Leticia Berlanga
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
| | - M Carmen Carrión
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. Camilo J. Cela 10, 13071, Ciudad Real, Spain
| | - José V Cuevas
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
| | - Ana M Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. Camilo J. Cela 10, 13071, Ciudad Real, Spain
| | - Arancha Carbayo
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
| | - Blanca R Manzano
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. Camilo J. Cela 10, 13071, Ciudad Real, Spain
| | - Enrique Ortí
- Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán 2, 46980, Paterna, Spain
| | - Félix A Jalón
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. Camilo J. Cela 10, 13071, Ciudad Real, Spain
| | - Begoña García
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
| | - Gustavo Espino
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001, Burgos, Spain
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Liu B, Monro S, Lystrom L, Cameron CG, Colon K, Yin H, Kilina S, McFarland SA, Sun W. Photophysical and Photobiological Properties of Dinuclear Iridium(III) Bis-tridentate Complexes. Inorg Chem 2018; 57:9859-9872. [PMID: 30091916 PMCID: PMC6337720 DOI: 10.1021/acs.inorgchem.8b00789] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of cationic dinuclear iridium(III) complexes (Ir1-Ir5) bearing terpyridine-capped fluorenyl bridging ligands and different polypyridyl or cyclometalating terminal tridentate ligands were synthesized, characterized, and evaluated for their photophysical and photobiological activities. The influence of the bridging and terminal ligands on the photophysical properties of the complexes was investigated by UV-vis absorption, emission, and transient absorption spectroscopy and simulated by TDDFT calculations. All of the complexes displayed strong bridging-ligand localized visible 1π,π* absorption and red- or near-infrared phosphorescence as well as broad triplet excited-state absorption across both visible and NIR wavelengths. These triplet states were assigned as predominantly 3π,π* for Ir1 (τ = 3.1 μs) and Ir4 (τ = 48 μs) and 3CT (charge transfer) for Ir2, Ir3, and Ir5 (τ = 1.7-2.7 μs). Complexes Ir1-Ir5 acted as in vitro photodynamic therapy (PDT) agents toward human SK-MEL-28 melanoma cells when activated with visible light, with submicromolar photocytotoxicity and phototherapeutic indices ranging from 20 to almost 300. The in vitro PDT effects with visible light did not correlate with singlet oxygen (1O2) quantum yields or DNA photocleaving capacity probed under cell-free conditions. All of the Ir(III) complexes phosphoresced brightly when associated with compromised cells (with or without light treatment) and exhibited photoactivated cellular uptake, highlighting the theranostic potential of this new class of Ir(III) complex photosensitizers.
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Affiliation(s)
- Bingqing Liu
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA
| | - Susan Monro
- Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, NS B4P 2R6, Canada
| | - Levi Lystrom
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA
| | - Colin G. Cameron
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402-6170, USA
| | - Katsuya Colon
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402-6170, USA
| | - Huimin Yin
- Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, NS B4P 2R6, Canada
| | - Svetlana Kilina
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA
| | - Sherri A. McFarland
- Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, NS B4P 2R6, Canada
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402-6170, USA
| | - Wenfang Sun
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND 58108-6050, USA
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Huang H, Banerjee S, Sadler PJ. Recent Advances in the Design of Targeted Iridium(III) Photosensitizers for Photodynamic Therapy. Chembiochem 2018; 19:1574-1589. [DOI: 10.1002/cbic.201800182] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Huaiyi Huang
- Department of Chemistry; University of Warwick; Gibbet Hill Coventry CV4 7AL UK
| | - Samya Banerjee
- Department of Chemistry; University of Warwick; Gibbet Hill Coventry CV4 7AL UK
| | - Peter J. Sadler
- Department of Chemistry; University of Warwick; Gibbet Hill Coventry CV4 7AL UK
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