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Frolova AY, Pakhomov AA, Kakuev DL, Sungurova AS, Dremina AA, Mamontova ED, Deyev SM, Martynov VI. Hybrid protein-peptide system for the selective pH-dependent binding and photodynamic ablation of cancer cells. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2023; 249:112803. [PMID: 37924677 DOI: 10.1016/j.jphotobiol.2023.112803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 10/02/2023] [Accepted: 10/24/2023] [Indexed: 11/06/2023]
Abstract
Creating new tools for the early diagnosis and treatment of cancer is one of the most important and intensively developing areas of modern medicine. Currently, photodynamic cancer therapy (PDT) is attracting increasing attention as a unique modality of minimally invasive treatment and due to the absence of acquired resistance. However, PDT is associated with undesirable activities, such as non-specific photodynamic effects of sunlight on healthy tissues. Therefore, an important fundamental task is the development of improved PDT agents that selectively act on the affected areas. Here, we report the development of a hybrid protein-peptide system for the selective pH-dependent binding and subsequent photodynamic cancer cells ablation. It is known that a distinctive feature of cancer cells is a decreased pH level in the extracellular space. In this study we exploited a peptide fragment (pHLIP) as a targeting module, which spontaneously binds and embeds into the cell membrane when pH decreases below neutral. A mutant of miniSOG protein fused to pHLIP was used as a photosensitizing constituent. We demonstrate that this protein-peptide photosensitizing system selectively binds to HeLa cells at pH below 6.8 and kills them when exposed to light. These findings demonstrate the feasibility of using genetically encoded MiniSOG fusions with pHLIP for the targeted delivery of PSs to cancer cells and subsequent highly precise photodynamic therapy.
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Affiliation(s)
- Anastasiya Yu Frolova
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
| | - Alexey A Pakhomov
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation.
| | - Dmitry L Kakuev
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
| | - Anna S Sungurova
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
| | - Anastasiya A Dremina
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
| | - Elizaveta D Mamontova
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
| | - Sergey M Deyev
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
| | - Vladimir I Martynov
- M.M. Shemyakin-Y.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russian Federation
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Leitão DDSTC, Barbosa-Carvalho APP, de Siqueira FC, Sousa RPE, Lopes AS, Chisté RC. Extracts of Eryngium foetidum Leaves from the Amazonia Were Efficient Scavengers of ROS and RNS. Antioxidants (Basel) 2023; 12:antiox12051112. [PMID: 37237978 DOI: 10.3390/antiox12051112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/30/2023] [Accepted: 05/16/2023] [Indexed: 05/28/2023] Open
Abstract
Eryngium foetidum L. is an edible plant widespread in Amazonian cuisine and its leaves have high levels of promising phenolic compounds for the production of extracts to be used as natural antioxidant additives. In this study, the in vitro scavenging capacity of three freeze-dried extracts of E. foetidum leaves, obtained by ultrasound-assisted extraction using green solvents [water (H2O), ethanol (EtOH), and ethanol/water (EtOH/H2O)], was investigated against the most common reactive oxygen species (ROS) and reactive nitrogen species (RNS) generated in both physiological and food systems. Six phenolic compounds were identified, chlorogenic acid (2198, 1816 and 506 μg/g) being the major compound for EtOH/H2O, H2O, and EtOH extracts, respectively. All E. foetidum extracts were efficient in scavenging all the ROS and RNS (IC50 = 45-1000 µg/mL), especially ROS. The EtOH/H2O extract showed the highest contents of phenolic compounds (5781 μg/g) and showed the highest efficiency in scavenging all the reactive species, with high efficiency for O2•- (IC50 = 45 μg/mL), except for ROO•, for which EtOH extract was the most efficient. Therefore, E. foetidum leaf extracts, especially EtOH/H2O, showed high antioxidant potential to be used as natural antioxidants in food formulations and are promising for nutraceuticals products.
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Affiliation(s)
| | - Anna Paula Pereira Barbosa-Carvalho
- Graduate Program of Food Science and Technology (PPGCTA), Institute of Technology (ITEC), Federal University of Pará (UFPA), Belém 66075-110, Brazil
| | - Francilia Campos de Siqueira
- Graduate Program of Food Science and Technology (PPGCTA), Institute of Technology (ITEC), Federal University of Pará (UFPA), Belém 66075-110, Brazil
| | - Railson Pontes E Sousa
- Faculty of Biotechnology, Institute of Biological Sciences (ICB), Federal University of Pará (UFPA), Belém 66075-110, Brazil
| | - Alessandra Santos Lopes
- Graduate Program of Food Science and Technology (PPGCTA), Institute of Technology (ITEC), Federal University of Pará (UFPA), Belém 66075-110, Brazil
- Faculty of Food Engineering (FEA), Institute of Technology (ITEC), Federal University of Pará (UFPA), Belém 66075-110, Brazil
| | - Renan Campos Chisté
- Graduate Program of Food Science and Technology (PPGCTA), Institute of Technology (ITEC), Federal University of Pará (UFPA), Belém 66075-110, Brazil
- Faculty of Food Engineering (FEA), Institute of Technology (ITEC), Federal University of Pará (UFPA), Belém 66075-110, Brazil
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3
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Thorning F, Henke P, Ogilby PR. Perturbed and Activated Decay: The Lifetime of Singlet Oxygen in Liquid Organic Solvents. J Am Chem Soc 2022; 144:10902-10911. [PMID: 35686951 DOI: 10.1021/jacs.2c03444] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Singlet oxygen, O2(a1Δg), the lowest excited electronic state of molecular oxygen, plays an important role in a range of chemical and biological processes. In liquid solvents, the reactions of singlet oxygen with a solute kinetically compete with solvent-mediated deactivation that yields the ground electronic state of oxygen, O2(X3Σg-). In this regard, the key parameter is the solvent-mediated lifetime of singlet oxygen, which embodies fundamental physical principles ranging from intermolecular interactions that perturb the forbidden O2(a1Δg) → O2(X3Σg-) transition to the transfer of oxygen's excitation energy into the vibrational modes of a solvent molecule M. Extensive research performed by the global community on this oxygen-related issue over the past ∼50 years reflects its significance. Unfortunately, a satisfactory quantitative understanding of this unique solvent effect has remained elusive thus far. In temperature-dependent studies, we have quantified the singlet oxygen lifetime in common aromatic and aliphatic organic solvents, including partially deuterated molecules that exploit the H/D solvent isotope effect on the lifetime. We now account for experimental data, including previously intractable data, using a model that exploits both weak and strong coupling in the M-O2 complex to accommodate the roles that M plays to (1) induce the forbidden O2(a1Δg) → O2(X3Σg-) transition and (2) accept the excitation energy of O2(a1Δg). As such, our approach brings us appreciably closer to an accurate and predictive ab initio solution for the long-standing oxygen-dependent problem that, in turn, should be relevant for a host of other molecular systems.
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Affiliation(s)
| | - Petr Henke
- Chemistry Department, Aarhus University, DK-8000 Aarhus, Denmark
| | - Peter R Ogilby
- Chemistry Department, Aarhus University, DK-8000 Aarhus, Denmark
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4
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Novikova IN, Potapova EV, Dremin VV, Dunaev AV, Abramov AY. Laser-induced singlet oxygen selectively triggers oscillatory mitochondrial permeability transition and apoptosis in melanoma cell lines. Life Sci 2022; 304:120720. [PMID: 35716733 DOI: 10.1016/j.lfs.2022.120720] [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: 04/25/2022] [Revised: 06/09/2022] [Accepted: 06/12/2022] [Indexed: 10/18/2022]
Abstract
Singlet oxygen (1O2) is an electronically excited state of triplet oxygen which is less stable than molecular oxygen in the electronic ground state and produced by photochemical, thermal, chemical, or enzymatic activation of O2. Although the role of singlet oxygen in biology and medicine was intensively studied with photosensitisers, using of these compounds is limited due to toxicity and lack of selectivity. We generated singlet oxygen in the skin fibroblasts and melanoma cell lines by 1267 nm laser irradiation. It did not induce production of superoxide anion, hydrogen peroxide or activation of lipid peroxidation in these cells confirming high selectivity of 1267 nm laser to singlet oxygen. 1O2 did not change mitochondrial membrane potential (ΔΨm) in skin fibroblasts but induced fluctuation in ΔΨm and complete mitochondrial depolarisation due to opening permeability transition pore in B16 melanoma cells. 1267 nm irradiation did not change the percentage of fibroblasts with necrosis but significantly increased the number of B16 melanoma cells with apoptosis. Thus, singlet oxygen can induce apoptosis in cancer B16 melanoma cells by opening of mitochondrial permeability transition pore (PTP) but not in control fibroblasts.
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Affiliation(s)
- Irina N Novikova
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
| | - Elena V Potapova
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
| | - Viktor V Dremin
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia; College of Engineering and Physical Sciences, Aston University, Birmingham, UK
| | - Andrey V Dunaev
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia
| | - Andrey Y Abramov
- Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia; Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK.
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5
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Thorning F, Jensen F, Ogilby PR. The oxygen-organic molecule photosystem: revisiting the past, recalibrating the present, and redefining the future. Photochem Photobiol Sci 2022; 21:1133-1141. [PMID: 35284990 DOI: 10.1007/s43630-022-00196-1] [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: 01/19/2022] [Accepted: 02/23/2022] [Indexed: 12/16/2022]
Abstract
Perturbation by a neighboring molecule M appreciably alters the properties of both the ground and excited states of molecular oxygen, as reflected in a variety of photophysical phenomena. In this article, we build upon the ~ 100 year history of work in this field, illustrating how the M-O2 system continues to challenge the scientific community, facilitating better insight into fundamental tenets of chemistry and physics.
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Affiliation(s)
| | - Frank Jensen
- Chemistry Department, Aarhus University, 8000, Aarhus, Denmark
| | - Peter R Ogilby
- Chemistry Department, Aarhus University, 8000, Aarhus, Denmark.
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6
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Mogensen DJ, Etzerodt M, Ogilby PR. Photoinduced Bleaching in an Efficient Singlet Oxygen Photosensitizing Protein: Identifying a Culprit in the Flavin-Binding LOV-Based Protein SOPP3. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Li C, Wang J, Ma R, Li L, Wu W, Cai D, Lu Q. Natural-derived alkaloids exhibit great potential in the treatment of ulcerative colitis. Pharmacol Res 2021; 175:105972. [PMID: 34758401 DOI: 10.1016/j.phrs.2021.105972] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 10/29/2021] [Accepted: 11/02/2021] [Indexed: 12/12/2022]
Abstract
Ulcerative colitis (UC) is a chronic nonspecific inflammatory disease of colon and rectum with unknown etiology, and the lesions are mainly confined to the mucosa and submucosa of large intestine. The main clinical features of UC include diarrhea, abdominal pain, bloody purulent stool and tenesmus, which seriously affect patients' quality of life. Most of UC patients would receive drug therapy with the exception of surgery for some severe cases. However, current drugs for the treatment of UC have certain limitations including difficulty of radical treatment, adverse reactions and drug resistance after long-term use and exorbitant price of some drugs. The research and development of new drugs for the treatment of UC is urgent, and natural alkaloids are an important source. This research paid close attention to the progress of natural alkaloids from diverse medicinal plants for treating UC in the last twenty years. The potential mechanisms for the natural alkaloids in the treatment of UC was closely related to its modulation of oxidative stress, immune response, intestinal flora and improvement of the gut barrier function. Remarkable effectiveness and safety of natural-derived alkaloids make them potential candidates of UC therapy.
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Affiliation(s)
- Cailan Li
- Department of Pharmacology, Zunyi Medical University, Zhuhai Campus, Zhuhai 519041, PR China
| | - Jiahao Wang
- Department of Pharmacology, Zunyi Medical University, Zhuhai Campus, Zhuhai 519041, PR China
| | - Runfang Ma
- Department of Pharmaceutical Sciences, Zunyi Medical University, Zhuhai Campus, Zhuhai 519041, PR China
| | - Luhao Li
- Health Service Center of Dengfeng Street Community, Yuexiu District, Guangzhou 510091, PR China
| | - Wenfeng Wu
- Laboratory of Herbal Pharmacology, GuangDong Second Traditional Chinese Medicine Hospital, Guangzhou 510095, PR China
| | - Dake Cai
- Laboratory of Herbal Pharmacology, GuangDong Second Traditional Chinese Medicine Hospital, Guangzhou 510095, PR China
| | - Qiang Lu
- Department of Pharmaceutical Sciences, Zunyi Medical University, Zhuhai Campus, Zhuhai 519041, PR China.
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8
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Mogensen DJ, Westberg M, Breitenbach T, Etzerodt M, Ogilby PR. Stable Transfection of the Singlet Oxygen Photosensitizing Protein SOPP3: Examining Aspects of Intracellular Behavior †. Photochem Photobiol 2021; 97:1417-1430. [PMID: 33934354 DOI: 10.1111/php.13440] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 04/26/2021] [Indexed: 01/28/2023]
Abstract
Protein-encased chromophores that photosensitize the production of reactive oxygen species, ROS, have been the center of recent activity in studies of oxidative stress. One potential attribute of such systems is that the local environment surrounding the chromophore, and that determines the chromophore's photophysics, ideally remains constant and independent of the global environment into which the system is placed. Therefore, a protein-encased sensitizer localized in the mitochondria would arguably have the same photophysics as that protein-encased sensitizer at the plasma membrane, for example. One thus obtains a useful tool to study processes modulated by spatially localized ROS. One ROS of interest is singlet oxygen, O2 (a1 Δg ). We recently developed a singlet oxygen photosensitizing protein, SOPP, in which flavin mononucleotide, FMN, is encased in a re-engineered light-oxygen-voltage protein. One goal was to ascertain how a version of this system, SOPP3, which selectively makes O2 (a1 Δg ), in vitro, behaves in a cell. We now demonstrate that SOPP3 undergoes exacerbated irradiation-mediated bleaching when expressed at either the plasma membrane or mitochondria in stable cell lines. We find that the environment around the SOPP3 system affects the bleaching rate, which argues against one of the key suppositions in support of a protein-encased chromophore.
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Affiliation(s)
| | | | | | - Michael Etzerodt
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University, Aarhus, Denmark
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9
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Morozov P, Lukina M, Shirmanova M, Divochiy A, Dudenkova V, Gol'tsman GN, Becker W, Shcheslavskiy VI. Singlet oxygen phosphorescence imaging by superconducting single-photon detector and time-correlated single-photon counting. OPTICS LETTERS 2021; 46:1217-1220. [PMID: 33720151 DOI: 10.1364/ol.415229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 01/31/2021] [Indexed: 06/12/2023]
Abstract
This Letter presents, to the best of our knowledge, a novel optical configuration for direct time-resolved measurements of luminescence from singlet oxygen, both in solutions and from cultured cells on photodynamic therapy. The system is based on the superconducting single-photon detector, coupled to the confocal scanner that is modified for the near-infrared measurements. The recording of a phosphorescence signal from singlet oxygen at 1270 nm has been done using time-correlated single-photon counting. The performance of the system is verified by measuring phosphorescence from singlet oxygen generated by the photosensitizers commonly used in photodynamic therapy: methylene blue and chlorin e6. The described system can be easily upgraded to the configuration when both phosphorescence from singlet oxygen and fluorescence from the cells can be detected in the imaging mode. Thus, co-localization of the signal from singlet oxygen with the areas inside the cells can be done.
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10
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Blacha-Grzechnik A, Drewniak A, Walczak KZ, Szindler M, Ledwon P. Efficient generation of singlet oxygen by perylene diimide photosensitizers covalently bound to conjugate polymers. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112161] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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11
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Bregnhøj M, Ogilby PR. Two-Photon Excitation of Neat Aerated Solvents with Visible Light Produces Singlet Oxygen. J Phys Chem A 2019; 123:7567-7575. [DOI: 10.1021/acs.jpca.9b05517] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Mikkel Bregnhøj
- Chemistry Department, Aarhus University, DK-8000 Aarhus, Denmark
| | - Peter R. Ogilby
- Chemistry Department, Aarhus University, DK-8000 Aarhus, Denmark
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12
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Westberg M, Etzerodt M, Ogilby PR. Rational design of genetically encoded singlet oxygen photosensitizing proteins. Curr Opin Struct Biol 2019; 57:56-62. [DOI: 10.1016/j.sbi.2019.01.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/14/2019] [Accepted: 01/29/2019] [Indexed: 01/29/2023]
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13
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Blázquez-Castro A. Optical Tweezers: Phototoxicity and Thermal Stress in Cells and Biomolecules. MICROMACHINES 2019; 10:E507. [PMID: 31370251 PMCID: PMC6722566 DOI: 10.3390/mi10080507] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 12/12/2022]
Abstract
For several decades optical tweezers have proven to be an invaluable tool in the study and analysis of myriad biological responses and applications. However, as with every tool, they can have undesirable or damaging effects upon the very sample they are helping to study. In this review the main negative effects of optical tweezers upon biostructures and living systems will be presented. There are three main areas on which the review will focus: linear optical excitation within the tweezers, non-linear photonic effects, and thermal load upon the sampled volume. Additional information is provided on negative mechanical effects of optical traps on biological structures. Strategies to avoid or, at least, minimize these negative effects will be introduced. Finally, all these effects, undesirable for the most, can have positive applications under the right conditions. Some hints in this direction will also be discussed.
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Affiliation(s)
- Alfonso Blázquez-Castro
- Department of Physics of Materials, Faculty of Sciences, Autonomous University of Madrid, 28049 Madrid, Spain.
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14
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Trewin AJ, Berry BJ, Wei AY, Bahr LL, Foster TH, Wojtovich AP. Light-induced oxidant production by fluorescent proteins. Free Radic Biol Med 2018; 128:157-164. [PMID: 29425690 PMCID: PMC6078816 DOI: 10.1016/j.freeradbiomed.2018.02.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/22/2018] [Accepted: 02/02/2018] [Indexed: 10/18/2022]
Abstract
Oxidants play an important role in the cell and are involved in many redox processes. Oxidant concentrations are maintained through coordinated production and removal systems. The dysregulation of oxidant homeostasis is a hallmark of many disease pathologies. The local oxidant microdomain is crucial for the initiation of many redox signaling events; however, methods to control oxidant product are limited. Some fluorescent proteins, including GFP, TagRFP, KillerRed, miniSOG, and their derivatives, generate oxidants in response to light. These genetically-encoded photosensitizers produce singlet oxygen and superoxide upon illumination and offer spatial and temporal control over oxidant production. In this review, we will examine the photosensitization properties of fluorescent proteins and their application to redox biology. Emerging concepts of selective oxidant species production via photosensitization and the impact of light on biological systems are discussed.
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Affiliation(s)
- Adam J Trewin
- University of Rochester Medical Center, Department of Anesthesiology and Perioperative Medicine, Rochester 14642, United States
| | - Brandon J Berry
- University of Rochester Medical Center, Department of Pharmacology and Physiology, Rochester 14642, United States
| | - Alicia Y Wei
- University of Rochester Medical Center, Department of Anesthesiology and Perioperative Medicine, Rochester 14642, United States
| | - Laura L Bahr
- University of Rochester Medical Center, Department of Anesthesiology and Perioperative Medicine, Rochester 14642, United States
| | - Thomas H Foster
- University of Rochester Medical Center, Department of Imaging Sciences, Rochester 14642, United States
| | - Andrew P Wojtovich
- University of Rochester Medical Center, Department of Anesthesiology and Perioperative Medicine, Rochester 14642, United States; University of Rochester Medical Center, Department of Pharmacology and Physiology, Rochester 14642, United States.
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15
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Zanocco RP, Bresoli-Obach R, Nonell S, Lemp E, Zanocco AL. Structure-activity study of furyl aryloxazole fluorescent probes for the detection of singlet oxygen. PLoS One 2018; 13:e0200006. [PMID: 29965981 PMCID: PMC6028117 DOI: 10.1371/journal.pone.0200006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 06/18/2018] [Indexed: 12/29/2022] Open
Abstract
In this study, we report the synthesis and the photochemical behavior of a series of new "click-on" fluorescent probes designed to detect singlet oxygen. They include a highly fluorescent chemical structure, an aryloxazole ring, linked to a furan moiety operating as singlet oxygen trap. Their activity depends on both the structure of the aryloxazole fluorophore and the electron-donating and electron-accepting properties of the substituents attached to the C-5 of the furan ring. All probes are selectively oxidized by singlet oxygen to give a single fluorescent product in methanol and produce negligible amounts of singlet oxygen themselves by self-sensitization. The most promising dyad, (E)-2-(2-(5-methylfuran-2-yl)vinyl)naphtho[1,2-d]oxazole, FN-6, shows outstanding reactivity and sensitivity: it traps singlet oxygen with a rate constant (5,8 ± 0.1) x 1(07) M-1 s-1 and its fluorescence increases by a factor of 500 upon reaction. Analysis of the dyads reactivity in terms of linear free energy relationships using the modified Swain and Lupton parameter F and the Fukui condensed function for the electrophilic attack, suggests that cycloaddition of singlet oxygen to the furan ring is partially concerted and possibly involves an exciplex with a "more open" structure than could be expected for a concerted cycloaddition.
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Affiliation(s)
- Renzo P. Zanocco
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | | | - Santi Nonell
- Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona, Spain
| | - Else Lemp
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Antonio L. Zanocco
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
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16
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Blázquez-Castro A, Breitenbach T, Ogilby PR. Cell cycle modulation through subcellular spatially resolved production of singlet oxygenviadirect 765 nm irradiation: manipulating the onset of mitosis. Photochem Photobiol Sci 2018; 17:1310-1318. [DOI: 10.1039/c8pp00338f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Subcellular spatially resolved (cytoplasmversusnucleus) production of singlet oxygen allows modulation of mitosis in human cells.
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Affiliation(s)
- Alfonso Blázquez-Castro
- Department of Physics of Materials
- Faculty of Sciences
- Autonomous University of Madrid
- Madrid 28049
- Spain
| | | | - Peter R. Ogilby
- Department of Chemistry
- Aarhus University
- Aarhus 8000-C
- Denmark
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17
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Anankanbil S, Pérez B, Yang J, Banerjee C, Guo Z. A novel array of interface-confined molecules: Assembling natural segments for delivery of multi-functionalities. J Colloid Interface Sci 2017; 508:230-236. [DOI: 10.1016/j.jcis.2017.08.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 08/14/2017] [Accepted: 08/16/2017] [Indexed: 12/30/2022]
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18
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Blázquez-Castro A. Direct 1O 2 optical excitation: A tool for redox biology. Redox Biol 2017; 13:39-59. [PMID: 28570948 PMCID: PMC5451181 DOI: 10.1016/j.redox.2017.05.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 04/30/2017] [Accepted: 05/20/2017] [Indexed: 12/28/2022] Open
Abstract
Molecular oxygen (O2) displays very interesting properties. Its first excited state, commonly known as singlet oxygen (1O2), is one of the so-called Reactive Oxygen Species (ROS). It has been implicated in many redox processes in biological systems. For many decades its role has been that of a deleterious chemical species, although very positive clinical applications in the Photodynamic Therapy of cancer (PDT) have been reported. More recently, many ROS, and also 1O2, are in the spotlight because of their role in physiological signaling, like cell proliferation or tissue regeneration. However, there are methodological shortcomings to properly assess the role of 1O2 in redox biology with classical generation procedures. In this review the direct optical excitation of O2 to produce 1O2 will be introduced, in order to present its main advantages and drawbacks for biological studies. This photonic approach can provide with many interesting possibilities to understand and put to use ROS in redox signaling and in the biomedical field.
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Affiliation(s)
- Alfonso Blázquez-Castro
- Department of Physics of Materials, Faculty of Sciences, Autonomous University of Madrid, Madrid, Spain; Formerly at Aarhus Institute of Advanced Studies (AIAS)/Department of Chemistry, Aarhus University, Aarhus, Denmark.
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Westberg M, Bregnhøj M, Etzerodt M, Ogilby PR. No Photon Wasted: An Efficient and Selective Singlet Oxygen Photosensitizing Protein. J Phys Chem B 2017; 121:9366-9371. [PMID: 28892628 DOI: 10.1021/acs.jpcb.7b07831] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Optogenetics has been, and will continue to be, a boon to mechanistic studies of cellular processes. Genetically encodable proteins that sensitize the production of reactive oxygen species (ROS) are expected to play an increasingly important role, particularly in elucidating mechanisms of temporally and spatially dependent cell signaling. However, a substantial challenge in developing such photosensitizing proteins has been to funnel the optical excitation energy into the initial selective production of only one ROS. Singlet molecular oxygen, O2(a1Δg), is a ROS known to have a wide range of effects on cell function. Nevertheless, mechanistic details of singlet oxygen's behavior in a cell are lacking. On the basis of the rational optimization of a LOV-derived flavoprotein, we now report the development and photophysical characterization of a protein-encased photosensitizer that efficiently and selectively produces singlet oxygen at the expense of other ROS, especially ROS that derive from photoinduced electron transfer reactions. These results set the stage for a plethora of new experiments to elucidate ROS-mediated events in cells.
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Affiliation(s)
- Michael Westberg
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Mikkel Bregnhøj
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Michael Etzerodt
- Department of Molecular Biology and Genetics, Aarhus University , DK-8000 Aarhus, Denmark
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
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20
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Bregnhøj M, Westberg M, Minaev BF, Ogilby PR. Singlet Oxygen Photophysics in Liquid Solvents: Converging on a Unified Picture. Acc Chem Res 2017; 50:1920-1927. [PMID: 28731691 DOI: 10.1021/acs.accounts.7b00169] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Singlet oxygen, O2(a1Δg), the lowest excited electronic state of molecular oxygen, is an omnipresent part of life on earth. It is readily formed through a variety of chemical and photochemical processes, and its unique reactions are important not just as a tool in chemical syntheses but also in processes that range from polymer degradation to signaling in biological cells. For these reasons, O2(a1Δg) has been the subject of intense activity in a broad distribution of scientific fields for the past ∼50 years. The characteristic reactions of O2(a1Δg) kinetically compete with processes that deactivate this excited state to the ground state of oxygen, O2(X3Σg-). Moreover, O2(a1Δg) is ideally monitored using one of these deactivation channels: O2(a1Δg) → O2(X3Σg-) phosphorescence at 1270 nm. Thus, there is ample justification to study and control these competing processes, including those mediated by solvents, and the chemistry community has likewise actively tackled this issue. In themselves, the solvent-mediated radiative and nonradiative transitions between the three lowest-lying electronic states of oxygen [O2(X3Σg-), O2(a1Δg), and O2(b1Σg+)] are relevant to issues at the core of modern chemistry. In the isolated oxygen molecule, these transitions are forbidden by quantum-mechanical selection rules. However, solvent molecules perturb oxygen in such a way as to make these transitions more probable. Most interestingly, the effect of a series of solvents on the O2(X3Σg-)-O2(b1Σg+) transition, for example, can be totally different from the effect of the same series of solvents on the O2(X3Σg-)-O2(a1Δg) transition. Moreover, a given solvent that appreciably increases the probability of a radiative transition generally does not provide a correspondingly viable pathway for nonradiative energy loss, and vice versa. The ∼50 years of experimental work leading to these conclusions were not easy; spectroscopically monitoring such weak and low-energy transitions in time-resolved experiments is challenging. Consequently, results obtained from different laboratories often were not consistent. In turn, attempts to interpret molecular events were often simplistic and/or misguided. However, over the recent past, increasingly accurate experiments have converged on a base of credible data, finally forming a consistent picture of this system that is resonant with theoretical models. The concepts involved encompass a large fraction of chemistry's fundamental lexicon, e.g., spin-orbit coupling, state mixing, quantum tunneling, electronic-to-vibrational energy transfer, activation barriers, collision complexes, and charge-transfer interactions. In this Account, we provide an explanatory overview of the ways in which a given solvent will perturb the radiative and nonradiative transitions between the O2(X3Σg-), O2(a1Δg), and O2(b1Σg+) states.
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Affiliation(s)
- Mikkel Bregnhøj
- Department
of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
| | - Michael Westberg
- Department
of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
| | - Boris F. Minaev
- Department
of Natural Sciences, Bogdan Khmelnitsky National University, Cherkassy 18031, Ukraine
| | - Peter R. Ogilby
- Department
of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
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21
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Protti S, Albini A, Viswanathan R, Greer A. Targeting Photochemical Scalpels or Lancets in the Photodynamic Therapy Field—The Photochemist's Role. Photochem Photobiol 2017; 93:1139-1153. [DOI: 10.1111/php.12766] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Accepted: 02/20/2017] [Indexed: 01/02/2023]
Affiliation(s)
- Stefano Protti
- PhotoGreen Lab Department of Chemistry University of Pavia Pavia Italy
| | - Angelo Albini
- PhotoGreen Lab Department of Chemistry University of Pavia Pavia Italy
| | | | - Alexander Greer
- Department of Chemistry Brooklyn College Brooklyn NY
- Ph.D. Program in Chemistry The Graduate Center of the City University of New York New York City NY
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22
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Banerjee C, Westberg M, Breitenbach T, Bregnhøj M, Ogilby PR. Monitoring Interfacial Lipid Oxidation in Oil-in-Water Emulsions Using Spatially Resolved Optical Techniques. Anal Chem 2017; 89:6239-6247. [DOI: 10.1021/acs.analchem.7b01228] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Michael Westberg
- Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
| | | | - Mikkel Bregnhøj
- Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
| | - Peter R. Ogilby
- Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
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23
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Westberg M, Bregnhøj M, Etzerodt M, Ogilby PR. Temperature Sensitive Singlet Oxygen Photosensitization by LOV-Derived Fluorescent Flavoproteins. J Phys Chem B 2017; 121:2561-2574. [PMID: 28257211 DOI: 10.1021/acs.jpcb.7b00561] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Optogenetic sensitizers that selectively produce a given reactive oxygen species (ROS) constitute a promising tool for studying cell signaling processes with high levels of spatiotemporal control. However, to harness the full potential of this tool for live cell studies, the photophysics of currently available systems need to be explored further and optimized. Of particular interest in this regard, are the flavoproteins miniSOG and SOPP, both of which (1) contain the chromophore flavin mononucleotide, FMN, in a LOV-derived protein enclosure, and (2) photosensitize the production of singlet oxygen, O2(a1Δg). Here we present an extensive experimental study of the singlet and triplet state photophysics of FMN in SOPP and miniSOG over a physiologically relevant temperature range. Although changes in temperature only affect the singlet excited state photophysics slightly, the processes that influence the deactivation of the triplet excited state are more sensitive to temperature. Most notably, for both proteins, the rate constant for quenching of 3FMN by ground state oxygen, O2(X3Σg-), increases ∼10-fold upon increasing the temperature from 10 to 43 °C, while the oxygen-independent channels of triplet state deactivation are less affected. As a consequence, this increase in temperature results in higher yields of O2(a1Δg) formation for both SOPP and miniSOG. We also show that the quantum yields of O2(a1Δg) production by both miniSOG and SOPP are mainly limited by the fraction of FMN triplet states quenched by O2(X3Σg-). The results presented herein provide a much-needed quantitative framework that will facilitate the future development of optogenetic ROS sensitizers.
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Affiliation(s)
- Michael Westberg
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Mikkel Bregnhøj
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Michael Etzerodt
- Department of Molecular Biology and Genetics, Aarhus University , DK-8000 Aarhus, Denmark
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
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24
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Minaev B. Photochemistry and Spectroscopy of Singlet Oxygen in Solvents. Recent Advances which Support the Old Theory. CHEMISTRY & CHEMICAL TECHNOLOGY 2016. [DOI: 10.23939/chcht10.04si.519] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Molecular oxygen is a paramagnetic gas with the triplet O2( ) ground state which exhibits just sluggish chemical reactivity in the absence of radical sources. In contrast, the excited metastable singlet oxygen O2( ) is highly reactive; it can oxygenate organic molecules in a wide range of specific reactions which differ from those of the usual triplet oxygen of the air. This makes the singlet oxygen an attractive reagent for new synthesis and even for medical treatments in photodynamic therapy. As an important intermediate O2( ) has attracted great attention of chemists during half-century studies of its reactivity and spectroscopy, but unusual properties of singlet oxygen makes it difficult to unravel all mysterious features. The semiempirical theory of spin-orbit coupling in dioxygen and in collision complexes of O2 with diamagnetic molecules proposed in 1982 year has explained and predicted many photochemical and spectral properties of dioxygen produced by the dye sensitization in solvents. Recent experiments with direct laser excitation of O2 in solvents provide a complete support of the old theory. The present review scrutinizes the whole story of development and experimental verification of this theory.
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25
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Garcia-Diaz M, Huang YY, Hamblin MR. Use of fluorescent probes for ROS to tease apart Type I and Type II photochemical pathways in photodynamic therapy. Methods 2016; 109:158-166. [PMID: 27374076 PMCID: PMC5075498 DOI: 10.1016/j.ymeth.2016.06.025] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 06/27/2016] [Accepted: 06/29/2016] [Indexed: 12/20/2022] Open
Abstract
Photodynamic therapy involves the excitation of a non-toxic dye by harmless visible light to produce a long-lived triplet state that can interact with molecular oxygen to produce reactive oxygen species (ROS), which can damage biomolecules and kill cells. ROS produced by electron transfer (Type 1) include superoxide, hydrogen peroxide and hydroxyl radical (HO), while singlet oxygen (1O2) is produced by energy transfer. Diverse methods exist to distinguish between these two pathways, some of which are more specific or more sensitive than others. In this review we cover the use of two fluorescence probes: singlet oxygen sensor green (SOSG) detects 1O2; and 4-hydroxyphenyl-fluorescein (HPF) that detects HO. Interesting data was collected concerning the photochemical pathways of functionalized fullerenes compared to tetrapyrroles, stable synthetic bacteriochlorins with and without central metals, phenothiazinium dyes interacting with inorganic salts such as azide.
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Affiliation(s)
- Maria Garcia-Diaz
- Department of Pharmacy, University of Copenhagen, Universitetsparken, 2, DK-2100, Copenhagen, Denmark
| | - Ying-Ying Huang
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
| | - Michael R Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA; Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA.
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26
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Bregnhøj M, Krægpøth MV, Sørensen RJ, Westberg M, Ogilby PR. Solvent and Heavy-Atom Effects on the O 2(X 3Σ g-) → O 2(b 1Σ g+) Absorption Transition. J Phys Chem A 2016; 120:8285-8296. [PMID: 27689752 DOI: 10.1021/acs.jpca.6b08035] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of 16 liquid solvents on both the spectrum and molar absorption coefficient of the X3Σg- → b1Σg+ transition in molecular oxygen has been examined. The ability to monitor this weak transition using air or oxygen saturated samples at atmospheric pressure was facilitated by the rapid and efficient O2(b1Σg+) → O2(a1Δg) transition, which allowed the use of O2(a1Δg) phosphorescence as a sensitive probe of O2(b1Σg+) production. The results of these O2(a1Δg) phosphorescence experiments are consistent with the results of independent experiments in which the O2(a1Δg) thus produced was "trapped" via a chemical reaction. The data recorded were used to calculate rate constants for the O2(b1Σg+) → O2(X3Σg-) radiative transition, a parameter that is otherwise difficult to directly obtain from such a wide range of solvents using O2(b1Σg+) → O2(X3Σg-) phosphorescence. The data show that the response of the O2(b1Σg+) → O2(X3Σg-) radiative transition to solvent is not the same as that of the O2(b1Σg+) → O2(a1Δg) and O2(a1Δg) → O2(X3Σg-) radiative transitions, both of which have been extensively examined over the years. However, our data are consistent with a theoretical model proposed by Minaev for the effect of solvent on radiative transitions in oxygen and, as such, arguably provide one of the final chapters in describing a system that has challenged the scientific community for years.
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Affiliation(s)
- Mikkel Bregnhøj
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Mikkel V Krægpøth
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | | | - Michael Westberg
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University , DK-8000 Aarhus, Denmark
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27
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Westberg M, Bregnhøj M, Banerjee C, Blázquez-Castro A, Breitenbach T, Ogilby PR. Exerting better control and specificity with singlet oxygen experiments in live mammalian cells. Methods 2016; 109:81-91. [DOI: 10.1016/j.ymeth.2016.07.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 07/01/2016] [Accepted: 07/03/2016] [Indexed: 12/25/2022] Open
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28
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Albrecht S, Ahlberg S, Beckers I, Kockott D, Lademann J, Paul V, Zastrow L, Meinke MC. Effects on detection of radical formation in skin due to solar irradiation measured by EPR spectroscopy. Methods 2016; 109:44-54. [DOI: 10.1016/j.ymeth.2016.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 06/09/2016] [Accepted: 06/10/2016] [Indexed: 11/28/2022] Open
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29
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Stockert JC, Blázquez-Castro A. Establishing the subcellular localization of photodynamically-induced ROS using 3,3'-diaminobenzidine: A methodological proposal, with a proof-of-concept demonstration. Methods 2016; 109:175-179. [PMID: 27154745 DOI: 10.1016/j.ymeth.2016.04.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 04/28/2016] [Accepted: 04/29/2016] [Indexed: 12/24/2022] Open
Abstract
The critical involvement of reactive oxygen species (ROS) in both physiological and pathological processes in cell biology makes their detection and assessment a fundamental topic in biomedical research. Established methodologies to study ROS in cell biology take advantage of oxidation reactions between the ROS and a reduced probe. After reacting the probe reveals the presence of ROS either by the appearance of colour (chromogenic reaction) or fluorescence (fluorogenic reaction). However current methodologies rarely allow for a site-specific detection of ROS production. Here we propose a colorimetric reaction driven by the oxidation of 3,3'-diaminobenzidine (DAB) by photodynamically-produced ROS that allows for fine detection of the ROS production site. The introduced methodology is fast, easy to implement and permits cellular resolution at the submicrometric level. Although the basic protocol is proved in a photodynamic model of ROS generation, the principle is applicable to many different scenarios of intracellular ROS production. As a consequence this proposed methodology should greatly complement other techniques aiming at establishing a precise subcellular localization of ROS generation.
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Affiliation(s)
- Juan C Stockert
- Department of Biology, Faculty of Sciences, Autonomous University of Madrid, Spain; Institute of Research and Technology in Animal Reproduction, Faculty of Veterinary Sciences, University of Buenos Aires, Argentina.
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30
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Riehl L, Seyboldt A, Ströbele M, Enseling D, Jüstel T, Westberg M, Ogilby PR, Meyer HJ. A ligand substituted tungsten iodide cluster: luminescence vs. singlet oxygen production. Dalton Trans 2016; 45:15500-15506. [DOI: 10.1039/c6dt02471h] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cluster (TBA)2[W6I8(CF3COO)6] shows photoluminescence in the solid state and in solution, and singlet oxygen (a1Δg) is generated in the presence of oxygen.
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Affiliation(s)
- Lara Riehl
- Abteilung für Festkörperchemie und Theoretische Anorganische Chemie
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Alexander Seyboldt
- Abteilung für Festkörperchemie und Theoretische Anorganische Chemie
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Markus Ströbele
- Abteilung für Festkörperchemie und Theoretische Anorganische Chemie
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - David Enseling
- Labor für Angewandte Materialwissenschaften
- Fachhochschule Münster
- 48565 Steinfurt
- Germany
| | - Thomas Jüstel
- Labor für Angewandte Materialwissenschaften
- Fachhochschule Münster
- 48565 Steinfurt
- Germany
| | | | | | - H.-Jürgen Meyer
- Abteilung für Festkörperchemie und Theoretische Anorganische Chemie
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
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