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Toyokuni S, Kong Y, Zheng H, Maeda Y, Katabuchi M, Motooka Y. Three-Dimensional Regulation of Ferroptosis at the Intersection of Iron, Sulfur, and Oxygen Executing Scrap and Build Toward Evolution. Antioxid Redox Signal 2023; 39:807-815. [PMID: 36401504 DOI: 10.1089/ars.2022.0142] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Significance: Iron is an essential element for every life on earth as a primary media for electron flow. Sulfur compounds as sulfhydryls counteract catalytic activity of iron whereas sulfur overdose is also toxic. In aerobic organisms, oxygen is the major media for electron transfer with higher intracellular mobility, which cooperates with the iron system. Based on the importance of iron, there is no active pathway to excrete iron outside the body in higher species. Whereas bacterial infection causes a scramble for iron in situ, cancer can be the outcome of the side effects of long use of iron and oxygen. Recent Advances: Ferroptosis is a recently coined cell death, defined as catalytic Fe(II)-dependent regulated necrosis accompanied by lipid peroxidation. Researchers recently recognized that ferroptosis is involved in a variety of physiological and pathological contexts, including embryonic erythropoiesis, aging, neurodegeneration and cancer cell death. Alternatively, carcinogenesis is a process to obtain iron addiction with ferroptosis-resistance, based on rodent animal studies. Critical Issues: Here we propose that ferroptosis is three-dimensionally regulated by iron, sulfur and oxygen, which correspond to oxidants, antioxidants and membrane fluidity with susceptibility to lipid peroxidation, respectively. Future Directions: Whereas life attempts to prevent ferroptosis, ferroptotic cells eventually emit iron-loaded ferritin as extracellular vesicles to maintain monopoly of iron. Antioxid. Redox Signal. 39, 807-815.
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Affiliation(s)
- Shinya Toyokuni
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
- Center for Low-Temperature Plasma Sciences, Nagoya University, Nagoya, Japan
| | - Yingyi Kong
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hao Zheng
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yuki Maeda
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Misako Katabuchi
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yashiro Motooka
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Zhao J, Huang X, Liu P, Qiu M, Li B, Wen Y, Li Y, Wang Q, Wu M, Chen Y, Pan Y. Engineering Alendronate-Composed Iron Nanochelator for Efficient Peritoneal Carcinomatosis Treatment. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203031. [PMID: 36057999 PMCID: PMC9596851 DOI: 10.1002/advs.202203031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/12/2022] [Indexed: 06/15/2023]
Abstract
Iron is an essential element for various cellular metabolism. Cancer cells also have high requirement of iron in their proliferation, invasion, and metastasis processes. Alendronate (ALN), a kind of FDA-approved bisphosphonates with metal-chelating capability, is initially certified to selectively bind to intracellular Fe3+ theoretically and experimentally in this study. Hence, CaALN iron nanochelator is rationally designed to kill cancer cells by synergism of Fe-depletion and calcium accumulation. In vitro experiments and RNA sequencing analysis indicate that CaALN nanomedicine inhibits the proliferation of cancer cells by depleting Fe, interfering with DNA replication, and triggering intracellular reactive oxygen species (ROS). Meanwhile, released Ca2+ and ROS mutually promote and induce damage of cellular macromolecules, which leads to mitochondrial apoptosis of cancer cells. In an intraperitoneal disseminated mouse model with the human ovarian cancer cells SKOV3, CaALN nanoparticles selectively accumulate in tumor tissues and result in significant retardation of tumor growth and ascites formation. The mean survival time of SKOV3-bearing mice in treatment group is prolonged from 33 to 90 d. These results indicate that the alendronate-originated iron chelator can serve as an efficient strategy for the treatment of peritoneal carcinomatosis.
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Affiliation(s)
- Jing Zhao
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Xiuyu Huang
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Peng Liu
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Miaojuan Qiu
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Binbin Li
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Yingfei Wen
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Yongshu Li
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Qiang Wang
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
| | - Meiying Wu
- School of Pharmaceutical Sciences (Shenzhen)Shenzhen Campus of Sun Yat‐sen UniversityShenzhenGuangdong518107P. R. China
| | - Yu Chen
- Materdicine LabSchool of Life SciencesShanghai UniversityShanghai200444P. R. China
| | - Yihang Pan
- Precision Medicine CenterScientific Research CenterThe Seventh Affiliated HospitalSun Yat‐sen UniversityShenzhen518107P. R. China
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Hausig-Punke F, Richter F, Hoernke M, Brendel JC, Traeger A. Tracking the Endosomal Escape: A Closer Look at Calcein and Related Reporters. Macromol Biosci 2022; 22:e2200167. [PMID: 35933579 DOI: 10.1002/mabi.202200167] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/19/2022] [Indexed: 11/11/2022]
Abstract
Crossing the cellular membrane and delivering active pharmaceuticals or biologicals into the cytosol of cells is an essential step in the development of nanomedicines. One of the most important intracellular processes regarding the cellular uptake of biologicals is the endolysosomal pathway. Sophisticated nanocarriers have been developed overcoming a major hurdle, the endosomal entrapment, and delivering their cargo to the required site of action. In parallel, in vitro assays have been established analyzing the performance of these nanocarriers. Among them, the release of the membrane-impermeable dye calcein has become a popular and straightforward method. It is accessible for most researchers worldwide, allows for rapid conclusions about the release potential, and enables the study of release mechanisms. This review is intended to provide an overview and guidance for scientists applying the calcein release assay. It comprises a survey of several applications in the study of endosomal escape, considerations of potential pitfalls, challenges and limitations of the assay, and a brief summary of complementary methods. Based on this review, we hope to encourage further research groups to take advantage of the calcein release assay for their own purposes and help to create a database for more efficient cross-correlations between nanocarriers. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Franziska Hausig-Punke
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743, Jena, Germany.,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743, Jena, Germany
| | - Friederike Richter
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743, Jena, Germany.,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743, Jena, Germany
| | - Maria Hoernke
- Chemistry and Pharmacy, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 9, 79104, Freiburg i.Br., Germany
| | - Johannes C Brendel
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743, Jena, Germany.,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743, Jena, Germany
| | - Anja Traeger
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743, Jena, Germany.,Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743, Jena, Germany
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Das M, Kumar Madduluri V, Jaswal V, Sarkar M. Bis(2-pyridyl)diimine as a naked eye colorimetric fluorescence turn off probe selectively for Fe(II) ions as a consequence of energy changes in the electronic states upon complexation. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113896] [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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5
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Calcein leakage as a robust assay for cytochrome c /H 2 O 2 –mediated liposome permeabilization. Anal Biochem 2018; 552:19-23. [DOI: 10.1016/j.ab.2017.03.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/07/2017] [Accepted: 03/15/2017] [Indexed: 12/22/2022]
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Hyman LM, Franz KJ. Probing oxidative stress: Small molecule fluorescent sensors of metal ions, reactive oxygen species, and thiols. Coord Chem Rev 2012; 256:2333-2356. [PMID: 23440254 PMCID: PMC3579673 DOI: 10.1016/j.ccr.2012.03.009] [Citation(s) in RCA: 231] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Oxidative stress is a common feature shared by many diseases, including neurodegenerative diseases. Factors that contribute to cellular oxidative stress include elevated levels of reactive oxygen species, diminished availability of detoxifying thiols, and the misregulation of metal ions (both redox-active iron and copper as well as non-redox active calcium and zinc). Deciphering how each of these components interacts to contribute to oxidative stress presents an interesting challenge. Fluorescent sensors can be powerful tools for detecting specific analytes within a complicated cellular environment. Reviewed here are several classes of small molecule fluorescent sensors designed to detect several molecular participants of oxidative stress. We focus our review on describing the design, function and application of probes to detect metal cations, reactive oxygen species, and intracellular thiol-containing compounds. In addition, we highlight the intricacies and complications that are often faced in sensor design and implementation.
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Affiliation(s)
- Lynne M. Hyman
- Department of Chemistry, Duke University, Durham, NC 27708, USA
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7
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Li XP, Xie WJ, Zhang Z, Kansara S, Jankovic J, Le WD. A mechanistic study of proteasome inhibition-induced iron misregulation in dopamine neuron degeneration. Neurosignals 2012; 20:223-36. [PMID: 22269801 DOI: 10.1159/000332954] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Accepted: 08/30/2011] [Indexed: 12/30/2022] Open
Abstract
Ubiquitin proteasome system (UPS) impairment and iron misregulation have been implicated in dopamine (DA) neuron degeneration in Parkinson's disease. As previously shown, proteasome inhibition in a rodent model can cause nigral neuron degeneration accompanied by iron accumulation. To investigate the involvement of iron in DA neuron degeneration, we generated an in vitro model by applying proteasome inhibitor lactacystin in DAergic cell line MES23.5 culture. We found that lactacystin caused marked increase in labile iron, reactive oxygen species and ubiquitin-conjugated protein aggregation prior to cell injury. These effects were attenuated by iron chelators or antioxidants. Furthermore, we demonstrated that the iron regulatory protein (IRP)/iron response element system contributed to UPS impairment-mediated DA neuron injury. We documented that IRP2 disruption resulted in an increase in transferrin receptor 1 (TfR1), a decrease in ferritin heavy chain (H-Frt), and eventually cell death. These findings provide insight into the mechanistic interplay between UPS impairment and iron misregulation and suggest that the disturbances in IRP2, TfR1 and H-Frt may contribute to DA neuron degeneration.
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Affiliation(s)
- Xu-ping Li
- Parkinson Disease Research Laboratory, Department of Neurology, Baylor College of Medicine, Houston, TX 77030, USA.
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Latxague L, Gaboriau F, Chassande O, Leger JM, Pires V, Rouge P, Dassonville-Klimpt A, Fardeau S, Jarry C, Lescoat G, Guillon J, Sonnet P. Antiproliferative effect on HepaRG cell cultures of new calix[4]arenes. Part II. J Enzyme Inhib Med Chem 2010; 26:204-15. [DOI: 10.3109/14756366.2010.489898] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Affiliation(s)
| | - François Gaboriau
- Inserm U991(EA/MDC), Université de Rennes 1, Hôpital Pontchaillou, Rennes, France
| | | | | | - Viviane Pires
- UMR-CNRS 6219, Laboratoire des glucides, Faculté de Pharmacie, Université de Picardie Jules Verne, 1 rue des Louvels, Amiens, France
| | - Pascal Rouge
- UMR-CNRS 6219, Laboratoire des glucides, Faculté de Pharmacie, Université de Picardie Jules Verne, 1 rue des Louvels, Amiens, France
| | - Alexandra Dassonville-Klimpt
- UMR-CNRS 6219, Laboratoire des glucides, Faculté de Pharmacie, Université de Picardie Jules Verne, 1 rue des Louvels, Amiens, France
| | - Sylvain Fardeau
- UMR-CNRS 6219, Laboratoire des glucides, Faculté de Pharmacie, Université de Picardie Jules Verne, 1 rue des Louvels, Amiens, France
| | - Christian Jarry
- Université de Bordeaux, Pharmacochimie EA 4138, Bordeaux, France
| | - Gerard Lescoat
- Inserm U991(EA/MDC), Université de Rennes 1, Hôpital Pontchaillou, Rennes, France
| | - Jean Guillon
- Université de Bordeaux, Pharmacochimie EA 4138, Bordeaux, France
| | - Pascal Sonnet
- UMR-CNRS 6219, Laboratoire des glucides, Faculté de Pharmacie, Université de Picardie Jules Verne, 1 rue des Louvels, Amiens, France
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Rodriguez-Lucena D, Gaboriau F, Rivault F, Schalk IJ, Lescoat G, Mislin GLA. Synthesis and biological properties of iron chelators based on a bis-2-(2-hydroxy-phenyl)-thiazole-4-carboxamide or -thiocarboxamide (BHPTC) scaffold. Bioorg Med Chem 2009; 18:689-95. [PMID: 20036563 DOI: 10.1016/j.bmc.2009.11.057] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 11/17/2009] [Accepted: 11/28/2009] [Indexed: 01/09/2023]
Abstract
Bis-2-(2-hydroxy-phenyl)-thiazole-4-carboxamides and -thiocarboxamides (BHPTCs) form a family of gemini hexacoordinated bis-tridentate chelating scaffolds. Four molecules were synthesized and shown to chelate iron(III) efficiently with a 1:1 stoichiometry. A dithioamide BHPTC displayed promising antiproliferative activity in several cancerous cell lines, making this molecule an interesting lead compound for the design of new iron-chelating anticancer drugs. Conversely, diamide BHPTCs had significant cytoprotective activity against iron overload in HepaRG cells in vitro, and were as efficient as and less toxic than deferoxamine B (DFO).
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Affiliation(s)
- David Rodriguez-Lucena
- Métaux et Microorganismes: Chimie, Biologie et Applications, IREBS FRE3211-CNRS/Université de Strasbourg, ESBS, Boulevard Sébastien Brant, F-67400 Illkirch, France
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Wang Z, Ma W, Chen C, Zhao J. Light-assisted decomposition of dyes over iron-bearing soil clays in the presence of H2O2. JOURNAL OF HAZARDOUS MATERIALS 2009; 168:1246-1252. [PMID: 19345009 DOI: 10.1016/j.jhazmat.2009.02.160] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2008] [Revised: 02/25/2009] [Accepted: 02/28/2009] [Indexed: 05/27/2023]
Abstract
Four types of soil clays from different sites in China have been chosen to simulate chemical remediation of soils contaminated with dyes by light-assisted Fenton-like method. X-Ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and electron spin resonance (ESR) measurements indicated that these soil clays contain iron oxides such as magnetite and hematite, where nondistorted iron active sites (ESR spectra, g=2.3) predominate. Upon visible or UV irradiation, the soil clays were very effective for the degradation of nonbiodegradable cationic dyes such as Rhodamine B (RhB) by activating H(2)O(2) at neutral pH. The photodegradation rates of RhB were closely related to total Fe content in clays and H(2)O(2) dosage, indicating the mineral-catalyzed Fenton-like reactions operated. Soil organic matters (SOM) would remarkably inhibit the photodecomposition of RhB dye. The reaction products were some low-molecular-weight dicarboxylic acids and their derivatives, all of which are easily biodegradable. A possible mechanism was proposed based on the results obtained by spin-trapping ESR technique.
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Affiliation(s)
- Zhaohui Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China
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11
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Messner DJ, Kowdley KV. Neoplastic transformation of rat liver epithelial cells is enhanced by non-transferrin-bound iron. BMC Gastroenterol 2008; 8:2. [PMID: 18254965 PMCID: PMC2275280 DOI: 10.1186/1471-230x-8-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2007] [Accepted: 02/06/2008] [Indexed: 12/26/2022] Open
Abstract
Background Iron overload is associated with liver toxicity, cirrhosis, and hepatocellular carcinoma in humans. While most iron circulates in blood as transferrin-bound iron, non-transferrin-bound iron (NTBI) also becomes elevated and contributes to toxicity in the setting of iron overload. The mechanism for iron-related carcinogenesis is not well understood, in part due to a shortage of suitable experimental models. The primary aim of this study was to investigate NTBI-related hepatic carcinogenesis using T51B rat liver epithelial cells, a non-neoplastic cell line previously developed for carcinogenicity and tumor promotion studies. Methods T51B cells were loaded with iron by repeated addition of ferric ammonium citrate (FAC) to the culture medium. Iron internalization was documented by chemical assay, ferritin induction, and loss of calcein fluorescence. Proliferative effects were determined by cell count, toxicity was determined by MTT assay, and neoplastic transformation was assessed by measuring colony formation in soft agar. Cyclin levels were measured by western blot. Results T51B cells readily internalized NTBI given as FAC. Within 1 week of treatment at 200 μM, there were significant but well-tolerated toxic effects including a decrease in cell proliferation (30% decrease, p < 0.01). FAC alone induced little or no colony formation in soft agar. In contrast, FAC addition to cells previously initiated with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) resulted in a concentration dependent increase in colony formation. This was first detected at 12 weeks of FAC treatment and increased at longer times. At 16 weeks, colony formation increased more than 10 fold in cells treated with 200 μM FAC (p < 0.001). The iron chelator desferoxamine reduced both iron uptake and colony formation. Cells cultured with 200 μM FAC showed decreased cyclin D1, decreased cyclin A, and increased cyclin B1. Conclusion These results establish NTBI as a tumor promoter in T51B rat liver epithelial cells. Changes in cyclin proteins suggest cell cycle disregulation contributes to tumor promotion by NTBI in this liver cell model.
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Ma Y, Liu Z, Hider RC, Petrat F. Determination of the Labile Iron Pool of Human Lymphocytes using the Fluorescent Probe, CP655. ANALYTICAL CHEMISTRY INSIGHTS 2007. [DOI: 10.4137/117739010700200005] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present study introduces a method for determining the labile iron pool (LIP) in human lymphocytes. It is measured using the probe CP655, the fluorescence of which is stoichiometrically quenched by the addition of iron. The intracellular CP655 fluorescence in lymphocytes was quenched by increasing intracellular iron concentrations using the highly lipophilic 8-hydroxyquinoline iron complex. Intracellular fluorescence quenching, mediated by the physiological intracellular labile iron, can be recovered on the addition of excess membrane-permeable iron chelator, CP94. The intracellular probe concentration was measured using laser scanning microscopy. An ex situ calibration was performed in a “cytosolic” medium based on the determined intracellular CP655 concentration and probe fluorescence quenching in the presence of iron. The concentration of the LIP of healthy human lymphocytes was determined to be 0.57 ± 0.27 μM. The use of the fluorescent probe CP655 renders it possible to record the time course of iron uptake and iron chelation by CP94 in single intact lymphocytes.
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Affiliation(s)
- Yongmin Ma
- Department of Pharmacy, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Zudong Liu
- Department of Pharmacy, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Robert C Hider
- Department of Pharmacy, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Frank Petrat
- Institut für Physiologische Chemie, Universitätsklinikum, Hufelandstr. 55, D-45122 Essen, Germany
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Kaiserová H, Simůnek T, van der Vijgh WJF, Bast A, Kvasnicková E. Flavonoids as protectors against doxorubicin cardiotoxicity: Role of iron chelation, antioxidant activity and inhibition of carbonyl reductase. Biochim Biophys Acta Mol Basis Dis 2007; 1772:1065-74. [PMID: 17572073 DOI: 10.1016/j.bbadis.2007.05.002] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2007] [Revised: 05/14/2007] [Accepted: 05/14/2007] [Indexed: 11/27/2022]
Abstract
Anthracycline antibiotics (e.g. doxorubicin and daunorubicin) are among the most effective and widely used anticancer drugs. Unfortunately, their clinical use is limited by the dose-dependent cardiotoxicity. Flavonoids represent a potentially attractive class of compounds to mitigate the anthracycline cardiotoxicity due to their iron-chelating, antioxidant and carbonyl reductase-inhibitory effects. The relative contribution of various characteristics of the flavonoids to their cardioprotective activity is, however, not known. A series of ten flavonoids including quercetin, quercitrin, 7-monohydroxyethylrutoside (monoHER) and seven original synthetic compounds were employed to examine the relationships between their inhibitory effects on carbonyl reduction, iron-chelation and antioxidant properties with respect to their protective potential against doxorubicin-induced cardiotoxicity. Cardioprotection was investigated in the neonatal rat ventricular cardiomyocytes whereas the H9c2 cardiomyoblast cells were used for cytotoxicity testing. Iron chelation was examined via the calcein assay and antioxidant effects and site-specific scavenging were quantified by means of inhibition of lipid peroxidation and hydroxyl radical scavenging activity, respectively. Inhibition of carbonyl reductases was assessed in cytosol from human liver. None of the flavonoids tested had better cardioprotective action than the reference cardioprotector, monoHER. However, a newly synthesized quaternary ammonium analog with comparable cardioprotective effects has been identified. No direct correlation between the iron-chelating and/or antioxidant effect and cardioprotective potential has been found. A major role of carbonyl reductase inhibition seems unlikely, as the best two cardioprotectors of the series are only weak reductase inhibitors.
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Affiliation(s)
- Helena Kaiserová
- Department of Biochemical Sciences, Faculty of Pharmacy in Hradec Králové, Charles University in Prague, Heyrovského 1203, 50005 Hradec Králové, Czech Republic.
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Jacobs EMG, Hendriks JCM, van Tits BLJH, Evans PJ, Breuer W, Liu DY, Jansen EHJM, Jauhiainen K, Sturm B, Porter JB, Scheiber-Mojdehkar B, von Bonsdorff L, Cabantchik ZI, Hider RC, Swinkels DW. Results of an international round robin for the quantification of serum non-transferrin-bound iron: Need for defining standardization and a clinically relevant isoform. Anal Biochem 2005; 341:241-50. [PMID: 15907869 DOI: 10.1016/j.ab.2005.03.008] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Indexed: 12/12/2022]
Abstract
Non-transferrin-bound iron (NTBI) appears in the circulation of patients with iron overload. Various methods to measure NTBI were comparatively assessed as part of an international interlaboratory study. Six laboratories participated in the study, using methods based on iron mobilization and detection with iron chelators or on reactivity with bleomycin. Serum samples of 12 patients with hereditary (n=11) and secondary (n=1) hemochromatosis were measured during a 3-day analysis using 4 determinations per sample per day, making a total of 144 measurements per laboratory. Bland-Altman plots for repeated measurements are presented. The methods differed widely in mean serum NTBI level (range 0.12-4.32mumol/L), between-sample variation (SD range 0.20-2.13mumol/L and CV range 49.3-391.3%), and within-sample variation (SD range 0.02-0.45mumol/L and CV range 4.4-193.2%). The results obtained with methods based on chelators correlated significantly (R(2) range 0.86-0.99). On the other hand, NTBI values obtained by the various methods related differently from those of serum transferrin saturation (TS) when expressed in terms of both regression coefficients and NTBI levels at TS of 50%. Recent studies underscore the clinical relevance of NTBI in the management of iron-overloaded patients. However, before measurement of NTBI can be introduced into clinical practice, there is a need for more reproducible protocols as well as information on which method best represents the pathophysiological phenomenon and is most pertinent for diagnostic and therapeutic purposes.
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Affiliation(s)
- Esther M G Jacobs
- Department of Clinical Chemistry, Radboud University Nijmegen Medical Center, 6500 HB Nijmegen, The Netherlands
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