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Gimondi S, Ferreira H, Reis RL, Neves NM. Intracellular Trafficking of Size-Tuned Nanoparticles for Drug Delivery. Int J Mol Sci 2023; 25:312. [PMID: 38203483 PMCID: PMC10779336 DOI: 10.3390/ijms25010312] [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: 11/23/2023] [Revised: 12/07/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024] Open
Abstract
Polymeric nanoparticles (NPs) are widely used as drug delivery systems in nanomedicine. Despite their widespread application, a comprehensive understanding of their intracellular trafficking remains elusive. In the present study, we focused on exploring the impact of a 20 nm difference in size on NP performance, including drug delivery capabilities and intracellular trafficking. For that, poly(ethylene glycol) methyl ether-block-poly(lactide-co-glycolide) (PLGA-PEG) NPs with sizes of 50 and 70 nm were precisely tailored. To assess their prowess in encapsulating and releasing therapeutic agents, we have employed doxorubicin (Dox), a well-established anticancer drug widely utilized in clinical settings, as a model drug. Then, the beneficial effect of the developed nanoformulations was evaluated in breast cancer cells. Finally, we performed a semiquantitative analysis of both NPs' uptake and intracellular localization by immunostaining lysosomes, early endosomes, and recycling endosomes. The results show that the smaller NPs (50 nm) were able to reduce the metabolic activity of cancer cells more efficiently than NPs of 70 nm, in a time and concentration-dependent manner. These findings are corroborated by intracellular trafficking studies that reveal an earlier and higher uptake of NPs, with 50 nm compared to the 70 nm ones, by the breast cancer cells. Consequently, this study demonstrates that NP size, even in small increments, has an important impact on their therapeutic effect.
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Affiliation(s)
- Sara Gimondi
- 3B’s Research Group, I3Bs—Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Guimarães, Portugal; (S.G.); (R.L.R.)
- ICVS/3B’s–PT Government Associate Laboratory, 4710-057 Guimarães, Portugal
| | - Helena Ferreira
- 3B’s Research Group, I3Bs—Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Guimarães, Portugal; (S.G.); (R.L.R.)
- ICVS/3B’s–PT Government Associate Laboratory, 4710-057 Guimarães, Portugal
| | - Rui L. Reis
- 3B’s Research Group, I3Bs—Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Guimarães, Portugal; (S.G.); (R.L.R.)
- ICVS/3B’s–PT Government Associate Laboratory, 4710-057 Guimarães, Portugal
| | - Nuno M. Neves
- 3B’s Research Group, I3Bs—Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Guimarães, Portugal; (S.G.); (R.L.R.)
- ICVS/3B’s–PT Government Associate Laboratory, 4710-057 Guimarães, Portugal
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Contreras Martínez OI, Angulo Ortíz A, Santafé Patiño G, Peñata-Taborda A, Berrio Soto R. Isoespintanol Antifungal Activity Involves Mitochondrial Dysfunction, Inhibition of Biofilm Formation, and Damage to Cell Wall Integrity in Candida tropicalis. Int J Mol Sci 2023; 24:10187. [PMID: 37373346 DOI: 10.3390/ijms241210187] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/07/2023] [Accepted: 06/07/2023] [Indexed: 06/29/2023] Open
Abstract
The growing increase in infections caused by C. tropicalis, associated with its drug resistance and consequent high mortality, especially in immunosuppressed people, today generates a serious global public health problem. In the search for new potential drug candidates that can be used as treatments or adjuvants in the control of infections by these pathogenic yeasts, the objective of this research was to evaluate the action of isoespintanol (ISO) against the formation of fungal biofilms, the mitochondrial membrane potential (ΔΨm), and its effect on the integrity of the cell wall. We report the ability of ISO to inhibit the formation of biofilms by up to 89.35%, in all cases higher than the values expressed by amphotericin B (AFB). Flow cytometric experiments using rhodamine 123 (Rh123) showed the ability of ISO to cause mitochondrial dysfunction in these cells. Likewise, experiments using calcofluor white (CFW) and analyzed by flow cytometry showed the ability of ISO to affect the integrity of the cell wall by stimulating chitin synthesis; these changes in the integrity of the wall were also observed through transmission electron microscopy (TEM). These mechanisms are involved in the antifungal action of this monoterpene.
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Affiliation(s)
| | - Alberto Angulo Ortíz
- Chemistry Department, Faculty of Basic Sciences, Universidad de Córdoba, Montería 230002, Colombia
| | - Gilmar Santafé Patiño
- Chemistry Department, Faculty of Basic Sciences, Universidad de Córdoba, Montería 230002, Colombia
| | - Ana Peñata-Taborda
- Biomedical and Molecular Biology Research Group, Universidad del Sinú E.B.Z., Montería 230001, Colombia
| | - Ricardo Berrio Soto
- Biology Department, Faculty of Basic Sciences, Universidad de Córdoba, Montería 230002, Colombia
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Customized multi-stimuli nanovehicles with dissociable 'bomblets' for photothermal-enhanced synergetic tumor therapy. Colloids Surf B Biointerfaces 2023; 222:113083. [PMID: 36542948 DOI: 10.1016/j.colsurfb.2022.113083] [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: 09/24/2022] [Revised: 12/04/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
Recently, the therapeutic effect of chemotherapy has been obviously impaired due to premature drug release, low tumor penetration, and multidrug resistance of nanoplatforms. In this paper, a novel multiple-sensitive drug delivery system (MC-ss-CDs) was developed by gating long-wavelength emitting carbon dots (CDs) on the openings of mesoporous carbon nanoparticles (MC) through disulfide bonds. The MC with excellent photothermal transition efficiency and high drug storage capacity for doxorubicin (DOX) was used as the delivery carrier. The CDs had multiple functions, including intelligent switching to hinder unwanted release, photothermal therapy (PTT) agents to improve the heat generation effect of MCs and bioimaging trackers to monitor drug delivery. The disulfide bonds, as the linkers between MC carriers and CDs, are stable under normal physical conditions and relatively labile under high GSH concentrations in the cytoplasm of tumor cells. After arriving at the tumor microenvironment, DOX/MC-ss-CDs can rapidly break into DOX/MC and CDs under high GSH concentrations. DOX/MC could realize efficient integration of PTT and chemotherapy on the surface of the tumor by stimuli-responsive DOX release and synergetic heating of MC and CDs. The small-sized CDs with excellent penetrating ability could effectively enter the deep tumor and realize NIR-triggered photothermal ablation. The DOX/MC-ss-CDs showed a chemophotothermal effect with a combination index of 0.38 in vitro and in vivo. Therefore, the DOX/MC-ss-CDs could be employed as a trackable nanovehicle for synergistic chemotherapy and PTT at different depths.
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Kim YS, Ko B, Kim DJ, Tak J, Han CY, Cho JY, Kim W, Kim SG. Induction of the hepatic aryl hydrocarbon receptor by alcohol dysregulates autophagy and phospholipid metabolism via PPP2R2D. Nat Commun 2022; 13:6080. [PMID: 36241614 PMCID: PMC9568535 DOI: 10.1038/s41467-022-33749-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 09/30/2022] [Indexed: 12/24/2022] Open
Abstract
Disturbed lipid metabolism precedes alcoholic liver injury. Whether and how AhR alters degradation of lipids, particularly phospho-/sphingo-lipids during alcohol exposure, was not explored. Here, we show that alcohol consumption in mice results in induction and activation of aryl hydrocarbon receptor (AhR) in the liver, and changes the hepatic phospho-/sphingo-lipids content. The levels of kynurenine, an endogenous AhR ligand, are elevated with increased hepatic tryptophan metabolic enzymes in alcohol-fed mice. Either alcohol or kynurenine treatment promotes AhR activation with autophagy dysregulation via AMPK. Protein Phosphatase 2 Regulatory Subunit-Bdelta (Ppp2r2d) is identified as a transcriptional target of AhR. Consequently, PPP2R2D-dependent AMPKα dephosphorylation causes autophagy inhibition and mitochondrial dysfunction. Hepatocyte-specific AhR ablation attenuates steatosis, which is associated with recovery of phospho-/sphingo-lipids content. Changes of AhR targets are corroborated using patient specimens. Overall, AhR induction by alcohol inhibits autophagy in hepatocytes through AMPKα, which is mediated by Ppp2r2d gene transactivation, revealing an AhR-dependent metabolism of phospho-/sphingo-lipids.
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Affiliation(s)
- Yun Seok Kim
- grid.31501.360000 0004 0470 5905Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine, Seoul, 03080 Korea ,grid.31501.360000 0004 0470 5905Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080 Republic of Korea ,grid.31501.360000 0004 0470 5905College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Bongsub Ko
- grid.31501.360000 0004 0470 5905Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine, Seoul, 03080 Korea
| | - Da Jung Kim
- grid.31501.360000 0004 0470 5905Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine, Seoul, 03080 Korea ,grid.412484.f0000 0001 0302 820XMetabolomics Core Facility, Department of Transdisciplinary Research and Collaboration, Biomedical Research Institute, Seoul National University Hospital, Seoul, 03082 Korea
| | - Jihoon Tak
- grid.31501.360000 0004 0470 5905College of Pharmacy, Seoul National University, Seoul, Republic of Korea ,grid.255168.d0000 0001 0671 5021College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang-si, Kyeonggi-do 10326 Republic of Korea
| | - Chang Yeob Han
- grid.31501.360000 0004 0470 5905College of Pharmacy, Seoul National University, Seoul, Republic of Korea ,grid.411545.00000 0004 0470 4320School of Pharmacy and Institute of New Drug Development, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896 Korea
| | - Joo-Youn Cho
- grid.31501.360000 0004 0470 5905Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine, Seoul, 03080 Korea ,grid.31501.360000 0004 0470 5905Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080 Republic of Korea
| | - Won Kim
- grid.31501.360000 0004 0470 5905Division of Gastroenterology and Hepatology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea
| | - Sang Geon Kim
- grid.255168.d0000 0001 0671 5021College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang-si, Kyeonggi-do 10326 Republic of Korea
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Evaluation of the Cytotoxicity of Aqueous Extract and Oleo-Essential Oil of Dorema ammoniacum Plant Oleo-Gum Resin in Some Human Cancer Cell Lines. Anal Cell Pathol (Amst) 2022; 2022:9725244. [PMID: 35983460 PMCID: PMC9381248 DOI: 10.1155/2022/9725244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 07/15/2022] [Indexed: 11/17/2022] Open
Abstract
Results Aqueous extract and essential oil reduced the viability of A549 cancer cells in a concentration-dependent manner. The lowest inhibitory concentrations (IC50) for both samples of D. ammoniacum oleo-gum resin were 10 and 2.5 μg/ml for 24 hours in A549 cell line, respectively. After treatment with extract and essential oil of D. ammoniacum oleo-gum resin, ROS increased significantly compared to the control group. Although changes in caspase-3 did not show a significant increase in extract, the caspase-3 was found to be increased after exposure to essential oil and caspase-9 was downregulated after exposure to essential oil. Also, exposure to essential oil of D. ammoniacum caused a reduction in MMP level. Conclusion Based on results, the cytotoxic effect of essential oil of D. ammoniacum can induce apoptosis toward A549 cell line via induction of oxidative stress, MMP depletion, and caspase-3 activation, which is independent to mitochondrial cytochrome c release and caspase-9 function.
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Soret M, Bouchendhomme T, Cleach J, Jouy N, Crola Da Silva C, Devin A, Grard T, Lencel P. Measurement of fish freshness: Flow cytometry analysis of isolated muscle mitochondria. Food Chem 2022; 373:131690. [PMID: 34865931 DOI: 10.1016/j.foodchem.2021.131690] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 01/26/2023]
Abstract
Mitochondria are real sensors of the physiological status of tissues. After the death of an animal, they maintain physiological activity for several days. This activity is highly dependent on the availability of nutrients in the tissue. In this study, flow cytometry was used to measure the membrane potential of mitochondria isolated from European seabass (Dicentrarchus labrax) red muscle stored in ice for seven days in order to characterize fish freshness. Two probes, TMRM and Rhodamine 123, were used to measure mitochondrial potential. During the first few days (D0 to D3), isolated mitochondria maintained high potential, and then lost their potential (from D3 to D5), but were always re-polarizable after addition of substrates (glutamate, malate and succinate). From D7, the mitochondria were more strongly depolarized and were difficult to repolarize by the substrates. Using flow cytometry, we demonstrated that mitochondria were an excellent marker to confirm seabass freshness.
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Affiliation(s)
- Méline Soret
- Univ. Littoral Côte d'Opale, UMR 1158 BioEcoAgro, Institut Charles Viollette, USC ANSES, INRAE, Univ. Artois, Univ. Lille, Univ. Picardie Jules Verne, Univ. Liège, Junia, F-62200 Boulogne-sur-Mer, France.
| | - Tiffanie Bouchendhomme
- Univ. Littoral Côte d'Opale, UMR 1158 BioEcoAgro, Institut Charles Viollette, USC ANSES, INRAE, Univ. Artois, Univ. Lille, Univ. Picardie Jules Verne, Univ. Liège, Junia, F-62200 Boulogne-sur-Mer, France.
| | - Jérôme Cleach
- Univ. Littoral Côte d'Opale, UMR 1158 BioEcoAgro, Institut Charles Viollette, USC ANSES, INRAE, Univ. Artois, Univ. Lille, Univ. Picardie Jules Verne, Univ. Liège, Junia, F-62200 Boulogne-sur-Mer, France.
| | - Nathalie Jouy
- Univ. Lille, Bio Imaging Center Lille, Lille, F-59000, France.
| | - Claire Crola Da Silva
- Univ. Claude Bernard Lyon 1, CarMeN Laboratory, INSERM U1060, INRAe, INSA, F-69500 Bron, France.
| | - Anne Devin
- UMR CNRS 5095 Institut de biochimie et génétique cellulaires (IBGC), F-33077 Bordeaux, France.
| | - Thierry Grard
- Univ. Littoral Côte d'Opale, UMR 1158 BioEcoAgro, Institut Charles Viollette, USC ANSES, INRAE, Univ. Artois, Univ. Lille, Univ. Picardie Jules Verne, Univ. Liège, Junia, F-62200 Boulogne-sur-Mer, France.
| | - Philippe Lencel
- Univ. Littoral Côte d'Opale, UMR 1158 BioEcoAgro, Institut Charles Viollette, USC ANSES, INRAE, Univ. Artois, Univ. Lille, Univ. Picardie Jules Verne, Univ. Liège, Junia, F-62200 Boulogne-sur-Mer, France.
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Chen X, Wu X, Liu G, Wang Q, Itenberg SA, Ouyang W, Song M, Dixon WR, Cao Y, Xiao H. Structure analysis of ethyl ferulate from Rubus corchorifolius L.f. leaves and its inhibitory effects on HepG2 liver cancer cells. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2021.101340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hafez AA, Jamali Z, Samiei S, Khezri S, Salimi A. Reduction of doxorubicin-induced cytotoxicity and mitochondrial damage by betanin in rat isolated cardiomyocytes and mitochondria. Hum Exp Toxicol 2021; 40:2123-2134. [PMID: 34105389 DOI: 10.1177/09603271211022800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Doxorubicin (DOX) is an anticancer drug which is used for treatment of several types of cancers. But the clinical use of doxorubicin is limited because of its cardiotoxicity and cardiomyopathy. Mitochondrial-dependent oxidative stress and cardiac inflammation appear to be involved in doxorubicin-induced cardiotoxicity. Betanin as a bioactive compound in Beetroot (Beta vulgaris L.) displays anti-radical, antioxidant gene regulatory and cardioprotective activities. In this current study, we investigated the protective effect of betanin on doxorubicin-induced cytotoxicity and mitochondrial-dependent oxidative stress in isolated cardiomyocytes and mitochondria. Isolated cardiomyocytes and mitochondria were treated with three concentrations of betanin (1, 5 and 10 µM) and doxorubicin (3.5 µM) for 6 h. The parameters of cellular and mitochondrial toxicity were analyzed using biochemical and flow cytometric methods. Our results showed a significant toxicity in isolated cardiomyocytes and mitochondria in presence of doxorubicin which was related to reactive oxygen species (ROS) formation, increase in malondialdehyde (MDA), increase in oxidation of GSH to GSSG, lysosomal/mitochondrial damages and mitochondrial swelling. While betanin pretreatment reverted doxorubicin-induced cytotoxicity and oxidative stress in isolated cardiomyocytes and mitochondria. These results suggest that betanin elicited a typical protective effect on doxorubicin-induced cytotoxicity and oxidative stress. It is possible that betanin could be used as a useful adjuvant in combination with doxorubicin chemotherapy for reduction of cardiotoxicity and cardiomyopathy.
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Affiliation(s)
- A A Hafez
- Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Z Jamali
- Student Research Committee, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
- Department of Addiction Studies, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
| | - S Samiei
- School of Medicine, Kordestan University of Medical Sciences, Sanandaj, Iran
| | - S Khezri
- Traditional Medicine and Hydrotherapy Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
- Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
| | - A Salimi
- Traditional Medicine and Hydrotherapy Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
- Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
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Wang X, Ni H, Xu W, Wu B, Xie T, Zhang C, Cheng J, Li Z, Tao L, Zhang Y. Difenoconazole induces oxidative DNA damage and mitochondria mediated apoptosis in SH-SY5Y cells. CHEMOSPHERE 2021; 283:131160. [PMID: 34139443 DOI: 10.1016/j.chemosphere.2021.131160] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 06/02/2021] [Accepted: 06/06/2021] [Indexed: 06/12/2023]
Abstract
Difenoconazole is one of the most typical triazole fungicides. Difenoconazole is widely used in the field of agricultural production, and its health and safety problems need to be further studied. The main purpose of this paper is to verify the neurotoxicity of Difenoconazole at the cellular level. In this study, SH-SY5Y cell line of human neuroblastoma was used to evaluate its potentially toxic effects and molecular mechanism in vitro. The research indicated that Difenoconazole could reduce cell viability and inhibit cell proliferation, induce DNA damage and accelerate programmed cell death. Further studies showed that Difenoconazole induced DNA double-strand breaks, intracellular generation of ROS, cleaved PARP, mitochondrial membrane potential collapse, induced Cyt c release, and Bax/Bcl-2 ratio increase in SH-SY5Y cells. In conclusion, the cytotoxicity of Difenoconazole revealed its toxic effect on SH-SY5Y cells, and the IC50 value was 55.41 μM after 24 h exposure. Meanwhile, the genetic toxicity of Difenoconazole has revealed that it can induce DNA damage and apoptosis of SH-SY5Y cells. Through this study, the toxic effects of Difenoconazole on SH-SY5Y cells are further understood, which provides a more scientific basis for its safe use and risk control.
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Affiliation(s)
- Xin Wang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Hongfei Ni
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Wenping Xu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Bing Wu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Te Xie
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Cheng Zhang
- Department of Pathology, UT Southwestern Medical Center, Dallas, TX, 75390, United States
| | - Jiagao Cheng
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Zhong Li
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Liming Tao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Yang Zhang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China.
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Hafez AA, Samiei S, Salimi A, Jamali Z, Khezri S, Sheikhghaderi H. Calcitriol attenuates the cytotoxicity induced by aluminium phosphide via inhibiting mitochondrial dysfunction and oxidative stress in rat isolated cardiomyocytes. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2021; 176:104883. [PMID: 34119212 DOI: 10.1016/j.pestbp.2021.104883] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 05/16/2021] [Accepted: 05/21/2021] [Indexed: 06/12/2023]
Abstract
These days, poisoning with aluminium phosphide (AlP), is one of the main health threats in human societies. Previous studies have been reported that cardiotoxicity induced by AlP, via mitochondrial dysfunction and oxidative stress is the main cause of death in victims. On the other, collectively, multiple lines of evidence strongly suggest that calcitriol has mitochondrial protective and antioxidant effects. Therefore, we assumed that calcitriol could presumably ameliorate AlP-induced oxidative stress and mitochondrial dysfunction in cardiomyocytes. Mitochondria and cardiomyocytes were isolated by differential centrifugation and collagenase perfusion respectively from rat heart. The isolated cardiomyocytes and mitochondria were cotreated with different concentrations of calcitriol (0.2, 0.4 and 1 μg/ml) and AlP (20 μg/ml) for 3 h. The parameters of cellular toxicity including; cytotoxicity, reactive oxygen species (ROS) formation, malondialdehyde (MDA) level, mitochondria membrane potential (ΔΨm) collapse, lysosomal membrane integrity, the level of oxidized and reduced glutathione (GSH and GSSG), and mitochondrial toxicity parameters including; succinate dehydrogenase (SDH) activity and mitochondrial swelling were analyzed using biochemical and flow cytometric evaluations. Administration of AlP significantly increased cytotoxicity, GSH depletion, cellular ROS formation, MDA level, mitochondrial and lysosomal dysfunction in isolated cardiomyocytes. In isolated mitochondria, AlP decreased SDH activity and mitochondrial swelling. The cotreatment of isolated cardiomyocytes and mitochondria with calcitriol (0.4 and 1 μg/ml) and AlP (20 μg/ml) showed the ability to reduce the toxic effects of AlP. These findings suggest a potential therapeutic role of calcitriol in protecting cardiomyocytes and cardiac mitochondria from oxidative damage induced by AlP. According to the results, calcitriol exerted ameliorative effects against AlP-induced cytotoxicity and mitochondrial toxicity, and the effect was attributed to the antioxidant properties.
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Affiliation(s)
- Asghar Ashrafi Hafez
- Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sara Samiei
- School of Medicine, Kordestan University of Medical Sciences, Sanandaj, Iran
| | - Ahmad Salimi
- Traditional Medicine and Hydrotherapy Research Center, Ardabil University of Medical Sciences, Iran; Department of Pharmacology and Toxicology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran.
| | - Zhaleh Jamali
- Student Research Committee, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
| | - Saleh Khezri
- Students Research Committee, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Hiva Sheikhghaderi
- School of paramedical, Kermanshah University of Medical Sciences, Kermanshah, Iran
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Zhang T, Wu B, Akakuru OU, Yao C, Sun S, Chen L, Ren W, Wu A, Huang P. Hsp90 inhibitor-loaded IR780 micelles for mitochondria-targeted mild-temperature photothermal therapy in xenograft models of human breast cancer. Cancer Lett 2020; 500:41-50. [PMID: 33359275 DOI: 10.1016/j.canlet.2020.12.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 12/15/2020] [Accepted: 12/18/2020] [Indexed: 12/22/2022]
Abstract
Mitochondria-targeted mild-temperature photothermal therapy (MT-PTT) is a promising strategy that can maximize anticancer effects and reduce adverse reactions. Here, a novel photosensitizer with mitochondrial targeting based on IR780 iodide and heat shock protein 90 inhibitor (BIIB021), which can passively accumulate in MCF-7 cells and achieve effective MT-PTT effect is synthesized. The prepared PEG-IR780-BIIB021 nano-micelles possess considerable biocompatibility and biological stability, with an encapsulation efficiency of about 84% for BIIB021. They can selectively enrich in mitochondria, and release BIIB021 after NIR irradiation to reduce cell tolerance to heat, thereby reducing the mitochondrial membrane potential and rapidly affecting key intrinsic apoptotic factors (Cyt-C, Caspase-9, Bcl-2 and Bax) to achieve the effect of MT-PTT. It is believed that mitochondria-targeted MT-PTT generated by the PEG-IR780-BIIB021 nano-micelles is a promising therapeutic strategy in clinical practice.
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Affiliation(s)
- Tao Zhang
- Department of Ultrasound in Medicine, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, 310009, PR China
| | - Bihan Wu
- Department of Ultrasound in Medicine, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, 310009, PR China
| | - Ozioma Udochukwu Akakuru
- Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Engineering Research Center for Biomedical Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 ZhongGuan West Road, Ningbo, 315201, China
| | - Chenyang Yao
- Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Engineering Research Center for Biomedical Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 ZhongGuan West Road, Ningbo, 315201, China
| | - Shan Sun
- Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Engineering Research Center for Biomedical Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 ZhongGuan West Road, Ningbo, 315201, China
| | - Libin Chen
- Department of Ultrasound in Medicine, Ningbo First Hospital, Ningbo, 315010, PR China
| | - Wenzhi Ren
- Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Engineering Research Center for Biomedical Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 ZhongGuan West Road, Ningbo, 315201, China.
| | - Aiguo Wu
- Cixi Institute of Biomedical Engineering, CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Engineering Research Center for Biomedical Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 ZhongGuan West Road, Ningbo, 315201, China.
| | - Pintong Huang
- Department of Ultrasound in Medicine, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, 310009, PR China.
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Yao J, Duan D, Song ZL, Zhang J, Fang J. Sanguinarine as a new chemical entity of thioredoxin reductase inhibitor to elicit oxidative stress and promote tumor cell apoptosis. Free Radic Biol Med 2020; 152:659-667. [PMID: 31931095 DOI: 10.1016/j.freeradbiomed.2020.01.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/08/2020] [Accepted: 01/08/2020] [Indexed: 12/17/2022]
Abstract
The alteration of redox homeostasis is a hallmark of cancer cells. As a critical player in regulating cellular redox signaling, thioredoxin reductase (TrxR) enzymes are increasingly recognized as attractive targets for anticancer drug development. We reported herein the natural product sanguinarine (SAN) as a potent inhibitor of TrxR with a new chemical scaffold. Inhibition of TrxR leads to accumulation of the oxidized thioredoxin, elicits oxidative stress, and finally promotes apoptosis of cancer cells. Further synthesis of different model compounds of SAN demonstrated that the phenanthridinium unit is responsible for the TrxR inhibition. The core structure of SAN, e.g., the phenanthridinium moiety, is different from those of known TrxR inhibitors, and thus SAN is a new chemical entity of TrxR inhibitors and may serve a lead for further development. In addition, as the phenanthridinium scaffold is widely present in natural products, the disclosure of TrxR inhibition by such unit sheds light in understanding the pharmacological actions of these molecules.
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Affiliation(s)
- Juan Yao
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China; School of Pharmacy, Gansu University of Chinese Medicine, Lanzhou, Gansu, 730000, China
| | - Dongzhu Duan
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China; Shaanxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji, 721013, China
| | - Zi-Long Song
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Junmin Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Jianguo Fang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China.
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Pan RL, Hu WQ, Pan J, Huang L, Luan CC, Shen HM. Achyranthes bidentata polypeptides prevent apoptosis by inhibiting the glutamate current in cultured hippocampal neurons. Neural Regen Res 2020; 15:1086-1093. [PMID: 31823889 PMCID: PMC7034289 DOI: 10.4103/1673-5374.270317] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Glutamate-induced excitotoxicity plays a critical role in the neurological impairment caused by middle cerebral artery occlusion. Achyranthes bidentata polypeptides have been shown to protect against neurological functional damage caused by middle cerebral artery occlusion, but the underlying neuroprotective mechanisms and the relationship to glutamate-induced excitotoxicity remain unclear. Therefore, in the current study, we investigated the protective effects of Achyranthes bidentata polypeptides against glutamate-induced excitotoxicity in cultured hippocampal neurons. Hippocampal neurons were treated with Mg2+-free extracellular solution containing glutamate (300 µM) for 3 hours as a model of glutamate-mediated excitotoxicity (glutamate group). In the normal group, hippocampal neurons were incubated in Mg2+-free extracellular solution. In the Achyranthes bidentata polypeptide group, hippocampal neurons were incubated in Mg2+-free extracellular solution containing glutamate (300 µM) and Achyranthes bidentata polypeptide at different concentrations. At 24 hours after exposure to the agents, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and Hoechst 33258 staining were used to assess neuronal viability and nuclear morphology, respectively. Caspase-3 expression and activity were evaluated using western blot assay and colorimetric enzymatic assay, respectively. At various time points after glutamate treatment, reactive oxygen species in cells were detected by H2DCF-DA, and mitochondrial membrane potential was detected by rhodamine 123 staining. To examine the effect of Achyranthes bidentata polypeptides on glutamate receptors, electrophysiological recording was used to measure the glutamate-induced inward current in cultured hippocampal neurons. Achyranthes bidentata polypeptide decreased the percentage of apoptotic cells and reduced the changes in caspase-3 expression and activity induced by glutamate. In addition, Achyranthes bidentata polypeptide attenuated the amplitude of the glutamate-induced current. Furthermore, the glutamate-induced increase in intracellular reactive oxygen species and reduction in mitochondrial membrane potential were attenuated by Achyranthes bidentata polypeptide treatment. These findings collectively suggest that Achyranthes bidentata polypeptides exert a neuroprotective effect in cultured hippocampal neurons by suppressing the overactivation of glutamate receptors and inhibiting the caspase-3-dependent mitochondrial apoptotic pathway. All animal studies were approved by the Animal Care and Use Committee, Nantong University, China (approval No. 20120216-001) on February 16, 2012.
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Affiliation(s)
- Rong-Lu Pan
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Institute of Nautical Medicine, Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Wen-Qing Hu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Institute of Nautical Medicine, Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China; Department of Neurobiology, Physiology and Behavior, College of Biological Science, Davis, CA, USA
| | - Jie Pan
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Institute of Nautical Medicine, Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Li Huang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Institute of Nautical Medicine, Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Cheng-Cheng Luan
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Institute of Nautical Medicine, Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Hong-Mei Shen
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Institute of Nautical Medicine, Co-Innovation Center of Neuroregeneration, Nantong University; Affiliated Mental Health Center of Nantong University, Nantong Brain Hospital, Nantong, Jiangsu Province, China
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14
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Li X, Feng X, Sun C, Liu Y, Zhao Q, Wang S. Mesoporous carbon‑manganese nanocomposite for multiple imaging guided oxygen-elevated synergetic therapy. J Control Release 2019; 319:104-118. [PMID: 31881317 DOI: 10.1016/j.jconrel.2019.12.042] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 12/20/2019] [Accepted: 12/24/2019] [Indexed: 12/21/2022]
Abstract
Despite of the extensive application of photodynamic therapy (PDT)nowadays, several restrictions have emerged such as hydrophobility, undesired phototoxicity and low selectivity of photosensitizer as well as the hypoxic tumor microenvironment. To address these challenges, a multifunctional mesoporous carbon‑manganese nanocomposite (MC-MnO2) is developed to load Chlorin e6 (Ce6) with a high loading capacity. The MC-MnO2 can prevent Ce6 from being activated by the sunlight to reduce unintentional phototoxicity significantly and realize the hypoxia relief via reacting with the H2O2 overexpressed in tumor tissue, meanwhile, the reduced product Mn2+ ion could act as a T1/T2-weighted MRI contrast. Based on the broad absorption of MC-MnO2 within the range of NIR, the nanoparticle has the potential for serving as a photothermal agent and photoacoustic imaging (PAI) agent. The PEG and iRGD are further decorated on MC-MnO2 (iPMC-MnO2) to improve the biocompatibility, targeting and penetration of the nanoparticle. Taking full advantage of the good photothermal effect of iPMC-MnO2, the photothermal therapy (PTT) and enhanced PDT are subtly integrated into one system, developing an intelligent multimodal diagnostic and therapeutic nanoplatform and realizing our "one nanoparticle fits all" dream.
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Affiliation(s)
- Xian Li
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China
| | - Xiaoqiang Feng
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China
| | - Changshan Sun
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China
| | - Yixuan Liu
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China
| | - Qinfu Zhao
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China.
| | - Siling Wang
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China.
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15
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Effect of TiO 2 and Fe doped TiO 2 nanoparticles on mitochondrial membrane potential in HBL-100 cells. Biointerphases 2019; 14:041003. [PMID: 31390867 DOI: 10.1116/1.5097643] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Titanium dioxide (TiO2) nanoparticles (NPs) have made unbelievable progress in the field of nanotechnology and biomedical research. The proper toxicological assessment of TiO2 NPs and the reduction of its cytotoxicity need to be addressed. Fe doping in TiO2 has been investigated to reduce the toxic effects of TiO2 NPs. Fe doped TiO2 powder samples were synthesized by sol-gel methods. The prepared samples were characterized by x-ray diffractometer (XRD), transmission electron microscope (TEM), and Raman spectroscopy to study their structure, morphology, and molecular conformation. XRD results revealed the coexistence of anatase (A) and rutile (R) phases of TiO2. The A-R transformation was observed with an increase in Fe doping along with the formation of α-Fe2O3 phase. TEM showed changes in morphology from spherical nanoparticles to elongated rod-shaped nanostructures with increasing Fe content. Shape variation of TiO2 nanoparticles after incorporation of Fe is a key reason behind the toxicity reduction. The authors observed that the toxicity of TiO2 nanoparticles was rescued upon Fe incorporation. The effect of NPs on the mitochondrial membrane potential (MMP) was assessed using flow cytometry. The MMP (%) decreased in TiO2 treated cells and increased by 1% Fe doped TiO2 NPs treated cells. Confocal imaging revealed the presence of functional mitochondria upon the exposure of Fe doped TiO2 NPs. The goal of the present study was to decrease the toxic effects induced by TiO2 NPs on mitochondrial potential and its prevention by Fe doping.
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Liu C, Zhou L, Wei F, Li L, Zhao S, Gong P, Cai L, Wong KMC. Versatile Strategy To Generate a Rhodamine Triplet State as Mitochondria-Targeting Visible-Light Photosensitizers for Efficient Photodynamic Therapy. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8797-8806. [PMID: 30730131 DOI: 10.1021/acsami.8b20224] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Through the use of a rhodamine-appended chelate, bpy-Rho, a versatile strategy has been demonstrated to readily form mitochondria-targeting photosensitizers via the incorporation of a variety of luminescent transition-metal systems, M-Rho, such as Re(I), Ir(III), Pt(II), and Rh(III). The emission from the rhodamine singlet excited state and the transition-metal triplet excited state is partially quenched by the depopulation of them into the dark rhodamine triplet excited state. The generation of the triplet excited state of a rhodamine moiety endows the complexes with mitochondria-targeting photosensitizing ability to form singlet oxygen (1O2) for use as a photodynamic therapy (PDT) agent upon visible-light irradiation. The combination of the rhodamine organic dye and luminescent transition-metal centers in such hybrid systems exhibits the synergistic merits for the biological applications, including low dark cytotoxicity, selective tumor cell uptake, high molar absorptivity suitable for low-energy excitation in the visible region, and high photostability. The corresponding in vitro photocytotoxicity and in vivo photo-antitumor efficacy have also been studied to demonstrate the potential PDT application of M-Rho.
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Affiliation(s)
- Chuangjun Liu
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , China
- College of Chemistry and Pharmaceutical Engineering , Huanghuai University , 463000 Zhumadian , China
| | - Lihua Zhou
- Guangdong Key Laboratory of Nanomedicine, Shenzhen Engineering Laboratory of Nanomedicine and Nanoformulations, CAS Key Lab for Health Informatics, CAS-HK Joint Lab for Biomaterials , Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology (SIAT), Chinese Academy of Sciences , Shenzhen 518055 , China
| | - Fangfang Wei
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , China
| | - Ling Li
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , China
| | - Shunan Zhao
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , China
| | - Ping Gong
- Guangdong Key Laboratory of Nanomedicine, Shenzhen Engineering Laboratory of Nanomedicine and Nanoformulations, CAS Key Lab for Health Informatics, CAS-HK Joint Lab for Biomaterials , Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology (SIAT), Chinese Academy of Sciences , Shenzhen 518055 , China
| | - Lintao Cai
- Guangdong Key Laboratory of Nanomedicine, Shenzhen Engineering Laboratory of Nanomedicine and Nanoformulations, CAS Key Lab for Health Informatics, CAS-HK Joint Lab for Biomaterials , Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology (SIAT), Chinese Academy of Sciences , Shenzhen 518055 , China
| | - Keith Man-Chung Wong
- Department of Chemistry , Southern University of Science and Technology , 1088 Xueyuan Blvd. , Shenzhen 518055 , China
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Props R, Rubbens P, Besmer M, Buysschaert B, Sigrist J, Weilenmann H, Waegeman W, Boon N, Hammes F. Detection of microbial disturbances in a drinking water microbial community through continuous acquisition and advanced analysis of flow cytometry data. WATER RESEARCH 2018; 145:73-82. [PMID: 30121434 DOI: 10.1016/j.watres.2018.08.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 07/26/2018] [Accepted: 08/06/2018] [Indexed: 06/08/2023]
Abstract
Detecting disturbances in microbial communities is an important aspect of managing natural and engineered microbial communities. Here, we implemented a custom-built continuous staining device in combination with real-time flow cytometry (RT-FCM) data acquisition, which, combined with advanced FCM fingerprinting methods, presents a powerful new approach to track and quantify disturbances in aquatic microbial communities. Through this new approach we were able to resolve various natural community and single-species microbial contaminations in a flow-through drinking water reactor. Next to conventional FCM metrics, we applied metrics from a recently developed fingerprinting technique in order to gain additional insight into the microbial dynamics during these contamination events. Importantly, we found that multiple community FCM metrics based on different statistical approaches were required to fully characterize all contaminations. Furthermore we found that for accurate cell concentration measurements and accurate inference from the FCM metrics (coefficient of variation ≤ 5%), at least 1000 cells should be measured, which makes the achievable temporal resolution a function of the prevalent bacterial concentration in the system-of-interest. The integrated RT-FCM acquisition and analysis approach presented herein provides a considerable improvement in the temporal resolution by which microbial disturbances can be observed and simultaneously provides a multi-faceted toolset to characterize such disturbances.
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Affiliation(s)
- Ruben Props
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Peter Rubbens
- KERMIT, Department of Data Analysis and Mathematical Modelling, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
| | - Michael Besmer
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, CH-8600, Duebendorf, Switzerland; Department of Environmental Systems Science, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zürich, Switzerland
| | - Benjamin Buysschaert
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Jurg Sigrist
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, CH-8600, Duebendorf, Switzerland
| | - Hansueli Weilenmann
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, CH-8600, Duebendorf, Switzerland
| | - Willem Waegeman
- KERMIT, Department of Data Analysis and Mathematical Modelling, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
| | - Nico Boon
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Frederik Hammes
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, CH-8600, Duebendorf, Switzerland.
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Yu K, Wang T, Li Y, Wang C, Wang X, Zhang M, Xie Y, Li S, An Z, Ye T. Niclosamide induces apoptosis through mitochondrial intrinsic pathway and inhibits migration and invasion in human thyroid cancer in vitro. Biomed Pharmacother 2017; 92:403-411. [DOI: 10.1016/j.biopha.2017.05.097] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 05/19/2017] [Accepted: 05/22/2017] [Indexed: 11/24/2022] Open
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19
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Zhang Y, Wu J, Xu W, Gao J, Cao H, Yang M, Wang B, Hao Y, Tao L. Cytotoxic effects of Avermectin on human HepG2 cells in vitro bioassays. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 220:1127-1137. [PMID: 27852506 DOI: 10.1016/j.envpol.2016.11.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 11/07/2016] [Accepted: 11/08/2016] [Indexed: 06/06/2023]
Abstract
Avermectin (AVM) has been widely used in agriculture and animal husbandry based on its broad spectrum of effective anthelmintic activity and specificity targets. However, AVM induction of cytotoxicity in human liver is largely unknown. In this study, we investigate the cytotoxic effects of AVM on HepG2 cells in vitro. The results revealed that AVM inhibited the viability of HepG2 cells and enhanced apoptosis. Established assays of cytotoxicity were performed to characterize the mechanism of AVM toxicity on HepG2 cells. Typical apoptosis morphological changes were shown in AVM-treatment cells including chromatin condensation and DNA fragmentation. We demonstrated that AVM-induced apoptosis of HepG2 cells were mediated by generated ROS. Moreover, a decrease in mitochondrial membrane potential (MMP) and up-regulating the Bax/Bcl-2 ratio, resulted in a release of cytochrome-c as well as activation of caspase-9/-3. In conclusion, our experimental results show that AVM has a potential threat to human health which may be induce apoptosis of human hepatocyte cells via caspase-dependent mitochondrial pathways.
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Affiliation(s)
- Yang Zhang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Jigang Wu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Wenping Xu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Jufang Gao
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, China
| | - Haijing Cao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Mingjun Yang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Bo Wang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Youwu Hao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
| | - Liming Tao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
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20
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Su D, Zhang R, Zhang C, Huang F, Xiao J, Deng Y, Wei Z, Zhang Y, Chi J, Zhang M. Phenolic-rich lychee (Litchi chinensis Sonn.) pulp extracts offer hepatoprotection against restraint stress-induced liver injury in mice by modulating mitochondrial dysfunction. Food Funct 2016; 7:508-15. [PMID: 26569420 DOI: 10.1039/c5fo00975h] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The pulp from lychee, a tropical to subtropical fruit, contains large quantities of phenolic compounds and exhibits antioxidant activities both in vitro and in vivo. In the present study, we investigated the mechanisms underlying the hepatoprotective effects of lychee pulp phenolics (LPPs) against restraint stress-induced liver injury in mice. After 18 h of restraint stress, increased levels of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities were observed. High levels of thiobarbituric acid reactive substances (TBARS) were also found. Restraint stress causes liver damage, which was protected against by LPP pretreatment at a dosage of 200 mg (kg d)(-1) for 21 consecutive days. This treatment remarkably decreased the serum ALT, AST and TBARS levels, elevated the liver glutathione (GSH) content, and the activities of glutathione peroxidase (GPx), superoxide dismutase (SOD) and catalase (CAT). Furthermore, respiratory chain complex and Na(+)-K(+)-ATPase activities were enhanced in liver mitochondria, while mitochondrial membrane potential levels and reactive oxygen species (ROS) production decreased. Thus, treatment with LPPs ameliorated restraint stress-induced liver mitochondrial dysfunction. These results suggest that LPPs protect the liver against restraint stress-induced damage by scavenging free radicals and modulating mitochondrial dysfunction. Thus, lychee pulp may be a functional biofactor to mitigate oxidative stress.
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Affiliation(s)
- Dongxiao Su
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China. and Department of Food Science and Engineering, College of Life Science, Yangtze University, Jingzhou, Hubei 434025, P. R. China
| | - Ruifen Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Cuilan Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Fei Huang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Juan Xiao
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Yuanyuan Deng
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Zhencheng Wei
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Yan Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Jianwei Chi
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China.
| | - Mingwei Zhang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China. and Department of Food Science and Engineering, College of Life Science, Yangtze University, Jingzhou, Hubei 434025, P. R. China
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Yang LY, Gao JL, Gao T, Dong P, Ma L, Jiang FL, Liu Y. Toxicity of polyhydroxylated fullerene to mitochondria. JOURNAL OF HAZARDOUS MATERIALS 2016; 301:119-126. [PMID: 26348144 DOI: 10.1016/j.jhazmat.2015.08.046] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 08/06/2015] [Accepted: 08/23/2015] [Indexed: 06/05/2023]
Abstract
Mitochondrial dysfunction is considered as a crucial mechanism of nanomaterial toxicity. Herein, we investigated the effects of polyhydroxylated fullerene (C60(OH)44, fullerenol), a model carbon-based nanomaterial with high water solubility, on isolated mitochondria. Our study demonstrated that fullerenol enhanced the permeabilization of mitochondrial inner membrane to H(+) and K(+) and induced mitochondrial permeability transition (MPT). The fullerenol-induced swelling was dose-dependent and could be effectively inhibited by MPT inhibitors such as cyclosporin A (CsA), adenosine diphosphate (ADP), ruthenium red (RR) and ethylenediaminetetraacetic acid (EDTA). After treating the mitochondria with fullerenol, the mitochondrial membrane potential (MMP) was found collapsed in a concentration-independent manner. The fluorescence anisotropy of hematoporphyrin (HP) changed significantly with the addition of fullerenol, while that of 1,6-diphenyl-hexatriene (DPH) changed slightly. Moreover, a decrease of respiration state 3 and increase of respiration state 4 were observed when mitochondria were energized with complex II substrate succinate. The results of transmission electron microscopy (TEM) provided direct evidence that fullerenol damaged the mitochondrial ultrastructure. The investigations can provide comprehensive information to elucidate the possible toxic mechanism of fullerenols at subcellular level.
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Affiliation(s)
- Li-Yun Yang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Jia-Ling Gao
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, PR China
| | - Tian Gao
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Ping Dong
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Long Ma
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Feng-Lei Jiang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Yi Liu
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
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22
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Gao JL, Wu M, Liu W, Feng ZJ, Zhang YZ, Jiang FL, Liu Y, Dai J. Dysfunction of Rice Mitochondrial Membrane Induced by Yb3+. J Membr Biol 2015; 248:1159-65. [PMID: 26305923 DOI: 10.1007/s00232-015-9833-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 08/06/2015] [Indexed: 02/08/2023]
Abstract
Ytterbium (Yb), a widely used rare earth element, is treated as highly toxic to human being and adverseness to plant. Mitochondria play a significant role in plant growth and development, and are proposed as a potential target for ytterbium toxicity. In this paper, the biological effect of Yb(3+) on isolated rice mitochondria was investigated. We found that Yb(3+) with high concentrations (200 ~ 600 μM) not only induced mitochondrial membrane permeability transition (mtMPT), but also disturbed the mitochondrial ultrastructure. Moreover, Yb(3+) caused the respiratory chain damage, ROS formation, membrane potential decrease, and mitochondrial complex II activity reverse. The results above suggested that Yb(3+) with high concentrations could induce mitochondrial membrane dysfunction. These findings will support some valuable information to the safe application of Yb-based agents.
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Affiliation(s)
- Jia-Ling Gao
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China
| | - Man Wu
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China
| | - Wen Liu
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China
| | - Zhi-Jiang Feng
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China
| | - Ye-Zhong Zhang
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China
| | - Feng-Lei Jiang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, People's Republic of China
| | - Yi Liu
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, People's Republic of China
| | - Jie Dai
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, Hubei, People's Republic of China.
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Thiosemicarbazone p-Substituted Acetophenone Derivatives Promote the Loss of Mitochondrial Δψ, GSH Depletion, and Death in K562 Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:394367. [PMID: 26075034 PMCID: PMC4436459 DOI: 10.1155/2015/394367] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 04/03/2015] [Indexed: 11/24/2022]
Abstract
A series of thiosemicarbazone (TSC) p-substituted acetophenone derivatives were synthesized and chemically characterized. The p-substituents appended to the phenyl group of the TSC structures were hydrogen, fluor, chlorine, methyl, and nitro, producing compounds named TSC-H, TSC-F, TSC-Cl, TSC-Me, and TSC-NO2, respectively. The TSC compounds were evaluated for their capacity to induce mitochondrial permeability, to deplete mitochondrial thiol content, and to promote cell death in the K562 cell lineage using flow cytometry and fluorescence microscopy. TSC-H, TSC-F, and TSC-Cl exhibited a bell-shaped dose-response curve for the induction of apoptosis in K562 cells due to the change from apoptosis to necrosis as the principal mechanism of cell death at the highest tested doses. TSC-Me and TSC-NO2 exhibited a typical dose-response profile, with a half maximal effective concentration of approximately 10 µM for cell death. Cell death was also evaluated using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, which revealed lower toxicity of these compounds for peripheral blood mononuclear cells than for K562 cells. The possible mechanisms leading to cell death are discussed based on the observed effects of the new TSC compounds on the cellular thiol content and on mitochondrial bioenergetics.
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Yokomizo CH, Pessoto FS, Prieto T, Cunha RLOR, Nantes IL. Effects of Trichlorotelluro-dypnones on Mitochondrial Bioenergetics and Their Relationship to the Reactivity with Protein Thiols. Chem Res Toxicol 2015; 28:1167-75. [DOI: 10.1021/tx5005166] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- César H. Yokomizo
- Departamento
de Biologia Molecular, Universidade Federal de São Paulo, R. Botucatu, 740, São Paulo, SP Brazil
| | - Felipe S. Pessoto
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Av. dos
Estados, 5001, Santo
André, SP Brazil
| | - Tatiana Prieto
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Av. dos
Estados, 5001, Santo
André, SP Brazil
| | - Rodrigo L. O. R. Cunha
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Av. dos
Estados, 5001, Santo
André, SP Brazil
| | - Iseli L. Nantes
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Av. dos
Estados, 5001, Santo
André, SP Brazil
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25
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Arnoldini M, Heck T, Blanco-Fernández A, Hammes F. Monitoring of dynamic microbiological processes using real-time flow cytometry. PLoS One 2013; 8:e80117. [PMID: 24244624 PMCID: PMC3828236 DOI: 10.1371/journal.pone.0080117] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 09/29/2013] [Indexed: 11/18/2022] Open
Abstract
We describe a straightforward approach to continuously monitor a variety of highly dynamic microbiological processes in millisecond resolution with flow cytometry, using standard bench-top instrumentation. Four main experimental examples are provided, namely: (1) green fluorescent protein expression by antibiotic-stressed Escherichia coli, (2) fluorescent labeling of heat-induced membrane damage in an autochthonous freshwater bacterial community, (3) the initial growth response of late stationary E. coli cells inoculated into fresh growth media, and (4) oxidative disinfection of a mixed culture of auto-fluorescent microorganisms. These examples demonstrate the broad applicability of the method to diverse biological experiments, showing that it allows the collection of detailed, time-resolved information on complex processes.
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Affiliation(s)
- Markus Arnoldini
- Department of Environmental Microbiology, Eawag - Swiss Federal Institute for Aquatic Science and Technology, Dübendorf, Switzerland
- Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland
| | - Tobias Heck
- Laboratory for Biomaterials, Empa -Swiss Federal Laboratories for Materials Science and Technology, St. Gallen, Switzerland
| | - Alfonso Blanco-Fernández
- Flow Cytometry Core Facilities, UCD-Conway Institute of Biomolecular & Biomedical Research, University College Dublin, Dublin, Ireland
| | - Frederik Hammes
- Department of Environmental Microbiology, Eawag - Swiss Federal Institute for Aquatic Science and Technology, Dübendorf, Switzerland
- * E-mail:
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26
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Heidari R, Babaei H, Eghbal MA. Ameliorative effects of taurine against methimazole-induced cytotoxicity in isolated rat hepatocytes. Sci Pharm 2012; 80:987-99. [PMID: 23264945 PMCID: PMC3528057 DOI: 10.3797/scipharm.1205-16] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Accepted: 08/06/2012] [Indexed: 11/30/2022] Open
Abstract
Methimazole is used as an antithyroid drug to control the symptoms of hyperthyroidism and maintain patients in a euthyroid state. Administration of this drug is associated with agranulocytosis and hepatotoxicity, which are the two most significant adverse effects. The present investigation was conducted to study the protective role of taurine against cytotoxicity induced by methimazole and its proposed reactive intermediary metabolite, N-methylthiourea, in an in vitro model of isolated rat hepatocytes. At different points in time, markers such as cell viability, reactive oxygen species (ROS) formation, lipid peroxidation, mitochondrial membrane potential, and hepatocyte glutathione content were evaluated. Treating hepatocytes with methimazole resulted in cytotoxicity characterized by the reduction in cell viability, an increase in ROS formation and lipid peroxidation, mitochondrial membrane potential collapse, and a reduction in cellular glutathione content. Furthermore, a significant amount of oxidized glutathione (GSSG) was formed when rat hepatocytes were treated with methimazole. N-methylthiourea toxicity was accompanied by a reduction in cellular GSH content, but no significant changes in lipid peroxidation, ROS formation, GSSG production, or changes in mitochondrial membrane potential were detected. Administration of taurine (200 μM) effectively reduced the toxic effects of methimazole or its metabolite in isolated rat hepatocytes.
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Affiliation(s)
- Reza Heidari
- Drug Applied Research Center, Tabriz university of medical sciences, 51656-65811 Tabriz, Iran. ; Department of pharmacology and Toxicology, Faculty of Pharmacy, Tabriz University of Medical Sciences, 51656-65811 Tabriz, Iran
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27
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Prado R, Rioboo C, Herrero C, Suárez-Bregua P, Cid A. Flow cytometric analysis to evaluate physiological alterations in herbicide-exposed Chlamydomonas moewusii cells. ECOTOXICOLOGY (LONDON, ENGLAND) 2012; 21:409-420. [PMID: 21971972 DOI: 10.1007/s10646-011-0801-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/22/2011] [Indexed: 05/31/2023]
Abstract
Investigation of herbicide toxicology in non-target aquatic primary producers such as microalgae is of great importance from an ecological point of view. In order to study the toxicity of the widely used herbicide paraquat on freshwater green microalga Chlamydomonas moewusii, physiological changes associated with 96 h-exposures to this pollutant were monitored using flow cytometry (FCM) technique. Intracellular reactive oxygen species concentration, cytoplasmic membrane potential, metabolic activity and cell protein content were monitored to evaluate the toxicological impact of paraquat on algal physiology. Results showed that herbicide paraquat induced oxidative stress in C. moewusii cells, as it indicated the increase of both superoxide anion and hydrogen peroxide levels observed in non-chlorotic cells of cultures exposed to increasing herbicide concentrations. Furthermore, a progressive increase in the percentage of depolarised cells and a decrease in the metabolic activity level were observed in response to paraquat when non-chlorotic cells were analysed. Chlorotic cells were probably non-viable cells, based on the cytoplasmic membrane depolarisation, its metabolically non-active state and its drastically reduced protein content. In view of the obtained results, we have concluded that a range of significant physiological alterations, detected by flow cytometry, occur when C. moewusii, an ubiquitous microalga in freshwater environments, is challenged with environmentally relevant concentrations of the herbicide paraquat.
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Affiliation(s)
- Raquel Prado
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad de A Coruña, Coruña, Spain
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28
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Tolosa L, Pinto S, Donato MT, Lahoz A, Castell JV, O’Connor JE, Gómez-Lechón MJ. Development of a Multiparametric Cell-based Protocol to Screen and Classify the Hepatotoxicity Potential of Drugs. Toxicol Sci 2012; 127:187-98. [DOI: 10.1093/toxsci/kfs083] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Protective effects of 7-difluoromethyl-5,4'-dimethoxygenistein against human aorta endothelial injury caused by lysophosphatidyl choline. Mol Cell Biochem 2011; 363:147-55. [PMID: 22198288 DOI: 10.1007/s11010-011-1167-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Accepted: 11/23/2011] [Indexed: 10/14/2022]
Abstract
7-Difluoromethyl-5,4'-dimethoxygenistein (DFMG) is an active new derivative of genistein (GEN). It has shown effective protection in vascular endothelial injury. To further investigate its potential protective effects and its mechanism probably related to atherosclerosis, in present study, human aorta endothelial cells (HAECs) were chosen and treated with various concentrations of lysophosphatidyl choline (LPC) to establish an experimental model. Results showed that 10.0 μmol/l of LPC was optimal for inducing HAEC injury. DFMG pretreatment was able to prevent HAEC injury induced by LPC and restore cell viability in a concentration-dependent manner. The protective efficacy of DFMG (10.0 μmol/l) was significantly greater than that of GEN (10.0 μmol/l) and vitamin E (50.0 μmol/l). The mechanisms underlying the protective effects of DFMG are related to the activation of the antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase and to the clearance of intracellular reactive oxygen species. DFMG inhibits the apoptosis of HAECs mediated by LPC involving the blockage of the mitochondrial apoptotic pathway.
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30
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Interplay of early biochemical manifestations by cadmium insult in sertoli–germ coculture: An in vitro study. Toxicology 2011; 287:46-53. [DOI: 10.1016/j.tox.2011.05.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 05/20/2011] [Accepted: 05/23/2011] [Indexed: 01/01/2023]
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31
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Tuo Y, Wang D, Li S, Chen C. Long-term exposure of INS-1 rat insulinoma cells to linoleic acid and glucose in vitro affects cell viability and function through mitochondrial-mediated pathways. Endocrine 2011; 39:128-38. [PMID: 21161439 DOI: 10.1007/s12020-010-9432-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Revised: 10/05/2010] [Accepted: 11/11/2010] [Indexed: 01/07/2023]
Abstract
Obesity with excessive levels of circulating free fatty acids (FFAs) is tightly linked to the incidence of type 2 diabetes. Insulin resistance of peripheral tissues and pancreatic β-cell dysfunction are two major pathological changes in diabetes and both are facilitated by excessive levels of FFAs and/or glucose. To gain insight into the mitochondrial-mediated mechanisms by which long-term exposure of INS-1 cells to excess FFAs causes β-cell dysfunction, the effects of the unsaturated FFA linoleic acid (C 18:2, n-6) on rat insulinoma INS-1 β cells was investigated. INS-1 cells were incubated with 0, 50, 250 or 500 μM linoleic acid/0.5% (w/v) BSA for 48 h under culture conditions of normal (11.1 mM) or high (25 mM) glucose in serum-free RPMI-1640 medium. Cell viability, apoptosis, glucose-stimulated insulin secretion, Bcl-2, and Bax gene expression levels, mitochondrial membrane potential and cytochrome c release were examined. Linoleic acid 500 μM significantly suppressed cell viability and induced apoptosis when administered in 11.1 and 25 mM glucose culture medium. Compared with control, linoleic acid 500 μM significantly increased Bax expression in 25 mM glucose culture medium but not in 11.1 mM glucose culture medium. Linoleic acid also dose-dependently reduced mitochondrial membrane potential (ΔΨm) and significantly promoted cytochrome c release from mitochondria in both 11.1 mM glucose and 25 mM glucose culture medium, further reducing glucose-stimulated insulin secretion, which is dependent on normal mitochondrial function. With the increase in glucose levels in culture medium, INS-1 β-cell insulin secretion function was deteriorated further. The results of this study indicate that chronic exposure to linoleic acid-induced β-cell dysfunction and apoptosis, which involved a mitochondrial-mediated signal pathway, and increased glucose levels enhanced linoleic acid-induced β-cell dysfunction.
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Affiliation(s)
- Ya Tuo
- Department of Forensic Science, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi, China
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32
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Shen H, Yuan Y, Ding F, Hu N, Liu J, Gu X. Achyranthes bidentata polypeptides confer neuroprotection through inhibition of reactive oxygen species production, Bax expression, and mitochondrial dysfunction induced by overstimulation of N-methyl-D-aspartate receptors. J Neurosci Res 2010; 88:669-76. [PMID: 19774671 DOI: 10.1002/jnr.22221] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Achyranthes bidentata polypeptides (ABPP), the important constituents separated from the aqueous extract of Achyranthes bidentata, have been shown to attenuate N-methyl-D-aspartate (NMDA)-induced cell apoptosis in cultured hippocampal neurons through differential modulation of NR2A- and NR2B-containing NMDA receptors. The present study sought to investigate the possible mechanism underlying the neuroprotective effect of ABPP on NMDA-induced cell death. Western blot analysis and colorimetric enzymatic assay demonstrated that ABPP pretreatment inhibited NMDA-induced increase of Bax protein expression or caspase-3 activity in cultured hippocampal neurons. Fluorescence measurements after staining with 2,7-dichlorofluorescin diacetate and rhodamine 123 showed that ABPP treatment also reversed NMDA-induced intracellular radical oxygen species (ROS) elevation and mitochondrial membrane potential depression in cultured hippocampal neurons. Furthermore, the in vivo effects of ABPP on cerebral neuronal damage during focal ischemia-reperfusion were also investigated. In rat middle cerebral artery occlusion (MCAO) model, ABPP attenuated the increase in the neurological deficit and cerebral infarction induced by focal ischemia-reperfusion, showing in vivo neuroprotective effects. The results collectively suggest that ABPP might exert neuroprotective actions through inhibiting Bax protein expression, caspase-3 activity, ROS production, and mitochondrial dysfunction that are all caused by overstimulation of NMDA receptors.
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Affiliation(s)
- Hongmei Shen
- Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, People's Republic of China
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33
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Brawek B, Löffler M, Wagner K, Huppertz HJ, Wendling AS, Weyerbrock A, Jackisch R, Feuerstein TJ. Reactive oxygen species (ROS) in the human neocortex: role of aging and cognition. Brain Res Bull 2009; 81:484-90. [PMID: 19854245 DOI: 10.1016/j.brainresbull.2009.10.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 10/14/2009] [Accepted: 10/15/2009] [Indexed: 12/14/2022]
Abstract
Reactive oxygen species (ROS), formed during normal aerobic metabolism, are involved in signal transduction and cognitive functions, but highly increased ROS concentrations may also have detrimental effects. The aim of the present study was to investigate whether aging and cognitive functions are associated with ROS generation in human neocortex obtained from neurosurgical patients. ROS formation in mitochondria from fresh and re-thawed neocortical specimens was measured by monitoring ROS-mediated conversion of dihydrorhodamine 123 to fluorescent rhodamine 123. The validity of this technique was characterized in rat brain mitochondria. The increase in the concentration-response curve of the complex I inhibitor rotenone on ROS generation, as measured by rhodamine 123 (Rh123) fluorescence, was much more pronounced than that of rotenone on mitochondrial [(3)H]-choline uptake [which indicates changes in the mitochondrial membrane potential (DeltaPsi(M))]. Thus, mitochondrial ROS generation can be shown by Rh123 fluorescence although this fluorescence may also reflect changes in DeltaPsi(M) to some extent. ROS formation in human brain mitochondria positively correlated with the age of patients. Moreover, an age-corrected positive correlation of ROS formation with presurgical cognitive performance was observed. Our data suggest a mild increase in ROS formation with aging possibly reflecting a physiological compensation of mitochondrial function. Furthermore, higher cognitive performances in tests of executive functions may be paralleled by slightly increased ROS levels.
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Affiliation(s)
- Bianca Brawek
- Section of Clinical Neuropharmacology, Department of Neurosurgery, University of Freiburg, D-79106 Freiburg, Germany
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34
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Donato MT, Martínez-Romero A, Jiménez N, Negro A, Herrera G, Castell JV, O'Connor JE, Gómez-Lechón MJ. Cytometric analysis for drug-induced steatosis in HepG2 cells. Chem Biol Interact 2009; 181:417-23. [PMID: 19647728 DOI: 10.1016/j.cbi.2009.07.019] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 07/22/2009] [Accepted: 07/23/2009] [Indexed: 12/01/2022]
Abstract
Drugs are capable of inducing hepatic lipid accumulation. When fat accumulates, lipids are primarily stored as triglycerides which results in steatosis and provides substrates for lipid peroxidation. An in vitro multiparametric flow cytometry assay was performed in HepG2 cells by using fluorescent probes to analyze cell viability (propidium iodide, PI), lipid accumulation (BODIPY493/503), mitochondrial membrane potential (tetramethyl rhodamine methyl ester, TMRM) and reactive oxygen species generation (ROS) (2',7'-dihydrochlorofluorescein diacetate, DHCF-DA) as functional markers. All the measurements were restricted to live cells by gating the cells that excluded PI or those that exhibited the typical forward and side scatter features of live cells. The assay was qualified by analyzing a number of selected model drugs with a well documented induction of steatosis in vivo using different mechanisms as positive controls and several non-steatosic compounds as negative controls. For the cytometric screening assay, the concentrations tested were up to the corresponding IC(10) value determined by the MTT assay. Among the parameters analyzed, increased BODIPY fluorescence was the most sensitive and selective marker of drug-induced steatosis. However, a more consistent predictive approach was the combination of two endpoints: lipid accumulation and ROS generation. The assay correctly identified 100% of steatosis-positive and steatosis-negative compounds, and a high steatosis risk was predicted for amiodarone, doxycycline, tetracycline and valproate treatments at therapeutic doses. The results suggest that this cell-based assay may be a useful approach to identify the potential of drug candidates to induce steatosis.
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Affiliation(s)
- M Teresa Donato
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital La Fe, Avda Campanar 21, 46009 Valencia, Spain
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Rohacova J, Marin ML, Martínez-Romero A, O'Connor JE, Gomez-Lechon MJ, Donato MT, Castell JV, Miranda MA. Photophysical characterization and flow cytometry applications of cholylamidofluorescein, a fluorescent bile acid scaffold. Photochem Photobiol Sci 2008; 7:860-6. [DOI: 10.1039/b806366d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Huang CC, Hsu PC, Hung YC, Liao YF, Liu CC, Hour CT, Kao MC, Tsay GJ, Hung HC, Liu GY. Ornithine decarboxylase prevents methotrexate-induced apoptosis by reducing intracellular reactive oxygen species production. Apoptosis 2007; 10:895-907. [PMID: 16133879 DOI: 10.1007/s10495-005-2947-z] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Methotrexate (MTX), a folate antagonist, was developed for the treatment of malignancies, and is currently used in rheumatoid arthritis (RA) and other chronic inflammatory disorders. It has been proven in short-term and long-term prospective studies that low doses of MTX (0.75 mg/Kg/week) are effective in controlling the inflammatory manifestations of RA. Low-concentrations of MTX achieve apoptosis and clonal deletion of activated peripheral T cells. One of the mechanisms of the anti-inflammatory and immunosuppressive effects may be the production of reactive oxygen species (ROS). However, the drug resistance of MTX in malignancies remains poorly understood. Ornithine decarboxylase (ODC) plays an important role in diverse biological functions, including cell development, differentiation, transformation, growth and apoptosis. In our previous studies, ODC overexpression was shown to prevent TNFalpha-induced apoptosis via reducing ROS. Here, we also investigated one mechanism of MTX-induced apoptosis and of drug resistance as to the anti-apoptotic effects of ODC during MTX treatment. We found MTX could induce caspase-dependent apoptosis and promote ROS generation together with disrupting the mitochondrial membrane potential (DeltaPsim) of HL-60 and Jurkat T cells. Putrescine and ROS scavengers could reduce MTX-induced apoptosis, which leads to the loss of DeltaPsim, through reducing intracellular ROS. Overexpression of ODC in parental cells had the same effects as putrescine and the ROS scavengers. Moreover, ODC overexpression prevented the decline of Bcl-2 that maintains DeltaPsim, the cytochrome c release and activations of caspase 9 and 3 following MTX treatment. The results demonstrate that MTX-induced apoptosis is ROS-dependent and occurs along a mitochondria-mediated pathway. Overexpressed ODC cells are resistant to MTX-induced apoptosis by reducing intracellular ROS production.
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Affiliation(s)
- C -C Huang
- Tzu Hui Institute of Technology, Pingtung, Taiwan, ROC
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Abstract
Permeant cationic fluorescent probes are widely employed to monitor mitochondrial transmembrane potential and its changes. The application of such potential-dependent probes in conjunction with both fluorescence microscopy and fluorescence spectroscopy allows the monitoring of mitochondrial membrane potential in individual living cells as well as in large population of cells. These approaches to the analysis of membrane potential is of extremely high value to obtain insights into both the basic energy metabolism and its dysfunction in pathologic cells. However, the use of fluorescent molecules to probe biological phenomena must follow the awareness of some principles of fluorescence emission, quenching, and quantum yield since it is a very sensitive tool, but because of this extremely high sensitivity it is also strongly affected by the environment. In addition, the instruments used to monitor fluorescence and its changes in biological systems have also to be employed with cautions due to technical limits that may affect the signals. We have therefore undertaken to review the most currently used analytical methods, providing a summary of practical tips that should precede data acquisition and subsequent analysis. Furthermore, we discuss the application and feasibility of various techniques and discuss their respective strength and weakness.
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Affiliation(s)
- Giancarlo Solaini
- Dipartimento di Biochimica, Università di Bologna, Via Irnerio 48, Bologna, 40126, Italy.
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Huang RFS, Yaong HC, Chen SC, Lu YF. In vitrofolate supplementation alleviates oxidative stress, mitochondria-associated death signalling and apoptosis induced by 7-ketocholesterol. Br J Nutr 2007; 92:887-94. [PMID: 15613250 DOI: 10.1079/bjn20041259] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Folate has recently been proposed as a new antioxidant. Folate supplementation may have a protective effect in counteracting oxidant-induced apoptotic damage. The present studies were undertaken to examine whether there is a direct link between folate levels, antioxidant capability and reduced apoptotic damage. Using anin vitrocellular model of 7-ketocholesterol (KC)-induced apoptosis, U937 cells were pre-cultured with a folate-deficient medium supplemented with various levels of folate (2–1500μmol/l) before treatment with 7-KC. Apoptotic markers, mitochondria-associated death signals and levels of reactive oxygen species were assayed. After treatment with 7-KC for 30h, low and high levels of folate supplementation significantly (P<0.05) reduced nuclear DNA loss. Only high levels of folate supplementation (>1000μmol/l) were effective in counteracting 7-KC-promoted apoptotic membrane phosphatidylserine exposure and DNA laddering. The attenuation of 7-KC-induced apoptotic damage by high-dose folate supplementation coincided with a partial normalization of mitochondria membrane potential dissipation, a suppression of cytochromecrelease and an inhibition of procaspase 3 activation. The prevention of mitochondrial dysfunctions and apoptotic processes was associated with antioxidant actions of high-dose folate by a marked scavenging of intracellular superoxide. Collectively, our present results demonstrate thatin vitrofolate supplementation exerts differentially protective effects against 7-KC-induced damage. High-dose supplementation alleviates oxidative stress, mitochondria-associated death signalling and apoptosis induced by 7-KC. However, thein vivorelevance is not clear and requires further study.
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Affiliation(s)
- R-F S Huang
- Department of Nutrition and Food Sciences, Fu-Jen University, Hsin-Chuang, Taiwan, Republic of China.
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Duval M, Plin C, Elimadi A, Vallerand D, Tillement JP, Morin D, Haddad PS. Implication of mitochondrial dysfunction and cell death in cold preservation--warm reperfusion-induced hepatocyte injury. Can J Physiol Pharmacol 2006; 84:547-54. [PMID: 16902600 DOI: 10.1139/y06-014] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Cold ischemia--warm reperfusion (CI/WR) injury of liver transplantation involves hepatocyte cell death, the nature and underlying mechanisms of which remain unclear. Isolated hepatocytes and isolated perfused livers were used to determine the prevalence of necrosis and apoptosis as well as mitochondrial dysfunction. In isolated cells, propidium iodide and Hoechst 33342 staining showed a cold-storage, time-dependent increase in necrosis, whereas apoptosis was minimal even after 48 h of hypothermia. Nonetheless, a progressive loss of mitochondrial membrane potential was observed. Translocation of mitochondrial cytochrome c toward microsomes occurred within 24 h of CI/WR, with cytochrome c reaching the cytosol later. Mitochondria isolated from whole livers subjected to CI/WR also display reduced metabolic parameters and increased susceptibility to swelling. These events are associated with increased activity of major initiator (caspase 9) and effector (caspase 3) caspases. The results demonstrate that CI/WR induces mitochondrial dysfunction in isolated cells and in the whole organ; only in the latter is that sufficient to trigger the classical mitochondrial pathway of apoptosis. Our study also provides evidence for the involvement of endoplasmic reticulum stress in CI/WR hepatocyte injury. Combined protection of mitochondria and endoplasmic reticulum may thus represent an innovative therapeutic avenue to enhance liver graft viability and functional integrity.
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Affiliation(s)
- Marjolaine Duval
- Département de Pharmacologie et Groupe d'étude sur les protéines membranaires, Faculté de Médecine, Université de Montréal, P.O. Box 6128, Downtown Station, Montréal, QC H3C 3J7, Canada
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Liu GY, Hung YC, Hsu PC, Liao YF, Chang WH, Tsay GJ, Hung HC. Ornithine decarboxylase prevents tumor necrosis factor alpha-induced apoptosis by decreasing intracellular reactive oxygen species. Apoptosis 2005; 10:569-81. [PMID: 15909119 DOI: 10.1007/s10495-005-1891-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Ornithine decarboxylase (ODC) plays an essential role in various biological functions, including cell proliferation, differentiation and cell death. However, how it prevents the cell apoptotic mechanism is still unclear. Previous studies have demonstrated that decreasing the activity of ODC by difluoromethylornithine (DFMO), an irreversible inhibitor of ODC, causes the accumulation of intracellular reactive oxygen species (ROS) and cell arrest, thus inducing cell death. These findings might indicate how ODC exerts anti-oxidative and anti-apoptotic effects. In our study, tumor necrosis factor alpha (TNF-alpha) induced apoptosis in HL-60 and Jurkat T cells. The kinetic studies revealed that the TNF-alpha -induced apoptotic process included intracellular ROS generation (as early as 1 h after treatment), the activation of caspase 8 (3 h), the cleavage of Bid (3 h) and the disruption of mitochondrial membrane potential (Delta psi(m)) (6 h). Furthermore, ROS scavengers, such as glutathione (GSH) and catalase, maintained Delta psi(m) and prevented apoptosis upon treatment. Putrescine and overexpression of ODC had similar effects as ROS scavengers in decreasing intracellular ROS and preventing the disruption of Delta psi(m) and apoptosis. Inhibition of ODC by DFMO in HL-60 cells only could increase ROS generation, but did not disrupt Delta psi(m) or induce apoptosis. However, DFMO enhanced the accumulation of ROS, disruption of Delta psi(m) and apoptosis when cells were treated with TNF-alpha . ODC overexpression avoided the decline of Bcl-2, prevented cytochrome c release from mitochondria and inhibited the activation of caspase 8, 9 and 3. Overexpression of Bcl-2 maintained Delta psi(m) and prevented apoptosis, but could not reduce ROS until four hours after TNF-alpha treatment. According to these data, we suggest that TNF-alpha induces apoptosis mainly by a ROS-dependent, mitochondria-mediated pathway. Furthermore, ODC prevents TNF-alpha -induced apoptosis by decreasing intracellular ROS to avoid Bcl-2 decline, maintain Delta psi(m), prevent cytochrome c release and deactivate the caspase cascade pathway.
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Affiliation(s)
- G-Y Liu
- Institute of Immunology, Chung Shan Medical University Hospital, Taichung, Taiwan, Republic of China.
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Rose P, Armstrong JS, Chua YL, Ong CN, Whiteman M. Beta-phenylethyl isothiocyanate mediated apoptosis; contribution of Bax and the mitochondrial death pathway. Int J Biochem Cell Biol 2005; 37:100-19. [PMID: 15381154 DOI: 10.1016/j.biocel.2004.05.018] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2004] [Revised: 05/21/2004] [Accepted: 05/25/2004] [Indexed: 12/31/2022]
Abstract
The initiating events that lead to the induction of apoptosis mediated by the chemopreventative agent beta-phenyethyl isothiocyanate (PEITC) have yet to be elucidated. In the present investigation, we examined the effects of PEITC on mitochondrial function and apoptotic signaling in hepatoma HepG2 cells and isolated rat hepatocyte mitochondria. PEITC induced a conformational change in Bax leading to its translocation to mitochondria in HepG2 cells. Bax accumulation was associated with a rapid loss of mitochondrial membrane potential (Deltapsim), impaired respiratory chain enzymatic activity, release of mitochondrial cytochrome c and the activation of caspase-dependent cell death. Caspase inhibition did not prevent Bax translocation, the release of cytochrome c or the loss of Deltapsim, but blocked caspase-mediated DNA fragmentation and cell death. To determine whether PEITC dependent Bax translocation caused loss of Deltapsim by the activation of the mitochondrial permeability transition (MPT), we examined the effects of PEITC in isolated rat hepatocyte mitochondria. Interestingly, PEITC did not induce MPT in isolated rat mitochondria. Accordingly, using pharmacological inhibitors of MPT namely cyclosporine A, trifluoperazine and Bongkrekic acid we were unable to block PEITC mediated apoptosis in HepG2 cells, this suggesting that mitochondrial permeablisation is a likely consequence of Bax dependent pore formation. Taken together, our data suggest that mitochondria are a key target in PEITC induced apoptosis in HepG2 cells via the pore forming ability of pro-apoptotic Bax.
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Affiliation(s)
- Peter Rose
- Department of Biochemistry, Occupational and Family Medicine, MD3, National University of Singapore, 8 Medical Drive, Singapore 117597, Singapore.
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42
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Zhang S, Ong CN, Shen HM. Involvement of proapoptotic Bcl-2 family members in parthenolide-induced mitochondrial dysfunction and apoptosis. Cancer Lett 2004; 211:175-88. [PMID: 15219941 DOI: 10.1016/j.canlet.2004.03.033] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2003] [Revised: 03/11/2004] [Accepted: 03/22/2004] [Indexed: 10/26/2022]
Abstract
Parthenolide is a sesquiterpene lactone responsible for the bioactivities of Feverfew. Besides its potent anti-inflammatory effect, this compound has recently been reported to induce apoptosis in cancer cells, possibly through mitochondrial dysfunction. In the present study, we attempted to examine parthenolide-mediated cell death signaling pathway by focusing on the involvement of Bcl-2 family members. Using a human colorectal cancer cell line COLO205, we first demonstrated that parthenolide acted through the cell death receptor pathway to activate caspase 8. Following caspase 8 activation, Bid, a proapoptotic Bcl-2 member, was cleaved and this cleavage then triggered Bax conformational changes and Bax translocation from cytosol to mitochondrial membrane. Meanwhile, another proapoptotic protein, Bak, was up-regulated and oligomerized on the mitochondrial membrane. All these alterations were found to be prerequisite for the subsequent release of proapopototic mitochondrial proteins, including cytochrome c and Samc, in parthenolide-treated cells. Moreover, selective inhibition of caspase 8 activity by a synthetic caspase inhibitor (IETD-FMK) or overexpression of a viral protein (CrmA) suppressed the cleavage of Bid, conformational changes of Bax, cytochrome c release, and apoptosis. Therefore, the proapoptotic Bcl-2 family members are important mediators relaying the cell death signaling elicited by parthenolide from caspase 8 to downstream effector caspases such as caspase 3, and eventually to cell death.
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Affiliation(s)
- Siyuan Zhang
- Department of Community, Occupational and Family Medicine, Faculty of Medicine (MD3), National University of Singapore, 16 Medical Drive, Singapore 117597
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Matsushita T, Yagi T, Hardin JA, Cragun JD, Crow FW, Bergen HR, Gores GJ, Nyberg SL. Apoptotic cell death and function of cryopreserved porcine hepatocytes in a bioartificial liver. Cell Transplant 2004; 12:109-21. [PMID: 12797372 DOI: 10.3727/000000003108746696] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
We have previously shown that cryopreservation leads to increased apoptotic death of porcine hepatocytes intended for use in a bioartificial liver (BAL). This study was designed to determine if a broad-spectrum caspase inhibitor, IDN-1965, reduced apoptosis and increased function of cryopreserved porcine hepatocytes in static culture or in a BAL. Porcine hepatocytes were studied immediately after isolation and after 2 weeks of cryopreservation in liquid nitrogen using medium supplemented with 25 micromol/L IDN-1965 or vehicle. Both apoptotic and necrotic cells were observed in cultures of fresh and cryopreserved hepatocytes, but the percentage of apoptotic cells increased after cryopreservation. Cryopreservation in IDN-1965 improved hepatocyte viability and reduced apoptotic cell death determined by TUNEL assay. Cryopreservation of hepatocytes in IDN-1965 was also associated with reduced caspase 3-like activity, decreased release of cytochrome c from mitochondria, and a slower decline in mitochondrial membrane potential after thawing. These markers of apoptosis were lowest after cryopreservation when IDN-1965 was added to both the culture and cryopreservation medium. Functional markers of hepatocyte activity (albumin production, diazepam metabolism, urea production) were also increased after cryopreservation and culture of hepatocytes in medium supplemented with 25 micromol/L IDN-1965. Cryopreservation of porcine hepatocytes in the presence of caspase inhibitor IDN-1965 was associated with reduced apoptosis and improved function of porcine hepatocytes in both static culture and a perfused BAL. These data demonstrate that inhibition of apoptosis also preserves cell function.
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Serviddio G, Pereda J, Pallardó FV, Carretero J, Borras C, Cutrin J, Vendemiale G, Poli G, Viña J, Sastre J. Ursodeoxycholic acid protects against secondary biliary cirrhosis in rats by preventing mitochondrial oxidative stress. Hepatology 2004; 39:711-20. [PMID: 14999689 DOI: 10.1002/hep.20101] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Ursodeoxycholic acid (UDCA) improves clinical and biochemical indices in primary biliary cirrhosis and prolongs survival free of liver transplantation. Recently, it was suggested that the cytoprotective mechanisms of UDCA may be mediated by protection against oxidative stress, which is involved in the development of cirrhosis induced by chronic cholestasis. The aims of the current study were 1) to identify the mechanisms involved in glutathione depletion, oxidative stress, and mitochondrial impairment during biliary cirrhosis induced by chronic cholestasis in rats; and 2) to determine the mechanisms associated with the protective effects of UDCA against secondary biliary cirrhosis. The findings of the current study indicate that UDCA partially prevents hepatic and mitochondrial glutathione depletion and oxidation resulting from chronic cholestasis. Impairment of biliary excretion was accompanied by decreased steady-state hepatic levels of gamma-glutamyl cysteine synthetase and gamma-cystathionase messenger RNAs. UDCA treatment led to up-regulation of gamma-glutamyl cysteine synthetase in animals with secondary biliary cirrhosis and prevented the marked increases in mitochondrial peroxide production and hydroxynonenal-protein adduct production that are observed during chronic cholestasis. A population of damaged and primarily apoptotic hepatocytes characterized by dramatic decreases in mitochondrial cardiolipin levels and membrane potential as well as phosphatidylserine exposure evolves in secondary biliary cirrhosis. UDCA treatment prevents the growth of this population along with the decreases in mitochondrial cardiolipin levels and membrane potential that are induced by chronic cholestasis. In conclusion, UDCA treatment enhances the antioxidant defense mediated by glutathione; in doing so, this treatment prevents cardiolipin depletion and cell injury in animals with secondary biliary cirrhosis.
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Affiliation(s)
- Gaetano Serviddio
- Department of Medical and Occupational Sciences, University of Foggia, Foggia, Italy
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Kennady PK, Ormerod MG, Singh S, Pande G. Variation of mitochondrial size during the cell cycle: A multiparameter flow cytometric and microscopic study. ACTA ACUST UNITED AC 2004; 62:97-108. [PMID: 15536637 DOI: 10.1002/cyto.a.20091] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Changes in mitochondrial structure and size are observed in response to alterations in cell physiology. Flow cytometry provides a useful tool to study these changes in intact cells. We have used flow cytometry and digital fluorescence microscopy to analyze the variations in mitochondrial size in relation to specific phases of the cell cycle. METHODS Supravital staining of rat fibroblasts was done with Hoechst 33342 and rhodamine 123, and cells were analyzed in a dual-laser flow cytometer. Synchronized cells at various stages of the cell cycle were analyzed for changes in mitochondrial size. These cells were also examined by electron microscopy, digital fluorescence microscopy and computerized image analysis to compare the lengths of the mitochondria. RESULTS By using fluorescence pulse width analysis, we observed two populations of mitochondria in intact cells. The percentage of cells with small and large mitochondria at specific stages of the cell cycle indicated that mitochondrial size increases during the cell cycle; early G1 phase cells had the smallest mitochondria and the mitotic phase cells had the largest mitochondria. These results were confirmed by microscopic analysis of cells. CONCLUSIONS Flow cytometry can distinguish the relative mitochondrial size in intact cells, and in combination with digital microscopy it can be used to study mitochondrial variation during the cell cycle.
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Affiliation(s)
- P Kavin Kennady
- Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad, India
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Baracca A, Sgarbi G, Solaini G, Lenaz G. Rhodamine 123 as a probe of mitochondrial membrane potential: evaluation of proton flux through F0 during ATP synthesis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2003; 1606:137-46. [PMID: 14507434 DOI: 10.1016/s0005-2728(03)00110-5] [Citation(s) in RCA: 376] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Rhodamine 123 (RH-123) was used to monitor the membrane potential of mitochondria isolated from rat liver. Mitochondrial energization induces quenching of RH-123 fluorescence and the rate of fluorescence decay is proportional to the mitochondrial membrane potential. Exploiting the kinetics of RH-123 fluorescence quenching in the presence of succinate and ADP, when protons are both pumped out of the matrix driven by the respiratory chain complexes and allowed to diffuse back into the matrix through ATP synthase during ATP synthesis, we could obtain an overall quenching rate proportional to the steady-state membrane potential under state 3 condition. We measured the kinetics of fluorescence quenching by adding succinate and ADP in the absence and presence of oligomycin, which abolishes the ADP-driven potential decrease due to the back-flow of protons through the ATP synthase channel, F(0). As expected, the initial rate of quenching was significantly increased in the presence of oligomycin, and conversely preincubation with subsaturating concentrations of the uncoupler carbonyl cyanide p-trifluoro-metoxyphenilhydrazone (FCCP) induced a decreased rate of quenching. N,N'-dicyclohexylcarbodiimide (DCCD) behaved similarly to oligomycin in increasing the rate of quenching. These findings indicate that RH-123 fluorescence quenching kinetics give reliable and sensitive evaluation of mitochondrial membrane potential, complementing steady-state fluorescence measurements, and provide a mean to study proton flow from the mitochondrial intermembrane space to the matrix through the F(0) channel.
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Affiliation(s)
- Alessandra Baracca
- Department of Biochemistry "G Moruzzi" Alma Mater Studiorum-University of Bologna, Via Irnerio 48, I-40126, Bologna, Italy.
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Lai HC, Liu TJ, Ting CT, Sharma PM, Wang PH. Insulin-like growth factor-1 prevents loss of electrochemical gradient in cardiac muscle mitochondria via activation of PI 3 kinase/Akt pathway. Mol Cell Endocrinol 2003; 205:99-106. [PMID: 12890571 DOI: 10.1016/s0303-7207(03)00200-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Insulin-like growth factor-1 (IGF 1) suppresses myocardial apoptosis and improves myocardial function in experimental models of cardiomyopathy. Apoptosis is triggered by mitochondria dysfunction and subsequent activation of caspases. We had previously shown that IGF 1 inhibited cardiomyocyte apoptosis via suppression of caspase, however, how IGF 1 and its signaling pathway modulates mitochondria function in cardiac muscle is not yet known. In this study we investigated how IGF 1 signaling modulates mitochondria membrane depolarization in the cardiomyocytes treated with doxorubicin. Doxorubicin rapidly induced loss of mitochondria electrochemical gradient and triggered mitochondria depolarization in primary cardiomyocytes, whereas addition of IGF 1 restored mitochondria electrochemical gradient. The effects of IGF 1 was blocked by a chemical inhibitor of PI 3 kinase and a dominant negative Akt, suggesting that IGF 1 signaling to mitochondria involves the PI 3 kinase-Akt pathway. Transducing cardiomyocytes with constitutive active PI 3 kinase partially restored the mitochondria electrochemical gradient in doxorubicin-treated cells. These findings provide direct evidence that IGF 1 modulation of mitochondria function is mediated through activation of PI 3 kinase and Akt. Additional experiments using agonist and antagonist of mitochondria K(ATP) channel suggest that IGF 1 signaling to mitochondria membrane does not directly involve K(ATP) channel. These findings suggest that cytosolic signaling to mitochondria may play a fundamental role in the cardiotoxic actions of doxorubicin and cardioprotective actions of IGF 1.
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Affiliation(s)
- Hui-Chin Lai
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Med Sci I, Rm C240, University of California, Irvine, CA 92697, USA
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Veiga A, Arrabaça JD, Sansonetty F, Ludovico P, Côrte-Real M, Loureiro-Dias MC. Energy conversion coupled to cyanide-resistant respiration in the yeasts Pichia membranifaciens and Debaryomyces hansenii. FEMS Yeast Res 2003; 3:141-8. [PMID: 12702446 DOI: 10.1016/s1567-1356(02)00189-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
Cyanide-resistant respiration (CRR) is a widespread metabolic pathway among yeasts, that involves a mitochondrial alternative oxidase sensitive to salicylhydroxamic acid (SHAM). The physiological role of this pathway has been obscure. We used the yeasts Debaryomyces hansenii and Pichia membranifaciens to elucidate the involvement of CRR in energy conversion. In both yeasts the adenosine triphosphate (ATP) content was still high in the presence of antimycin A or SHAM, but decreased to low levels when both inhibitors were present simultaneously, indicating that CRR was involved in ATP formation. Also the mitochondrial membrane potential (Delta Psi(m)), monitored by fluorescent dyes, was relatively high in the presence of antimycin A and decreased upon addition of SHAM. In both yeasts the presence of complex I was confirmed by the inhibition of oxygen consumption in isolated mitochondria by rotenone. Comparing in the literature the occurrence of CRR and of complex I among yeasts, we found that CRR and complex I were simultaneously present in 12 out of 13 yeasts, whereas in six out of eight yeasts in which CRR was absent, complex I was also absent. Since three phosphorylating sites are active in the main respiratory chain and only one in CRR, we propose a role for this pathway in the fine adjustment of energy provision to the cell.
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Affiliation(s)
- Alexandra Veiga
- Laboratório de Microbiologia, Dep. Botânica e Engenharia Biológica, Instituto Superior de Agronomia, 1349-017 Lisboa, Portugal
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Shen HM, Ding WX, Ong CN. Intracellular glutathione is a cofactor in methylseleninic acid-induced apoptotic cell death of human hepatoma HEPG(2) cells. Free Radic Biol Med 2002; 33:552-61. [PMID: 12160937 DOI: 10.1016/s0891-5849(02)00918-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Selenium is a widely studied dietary anticancer agent. Among various selenium compounds, the methylated forms appear to be particularly effective in cancer prevention. Intracellular glutathione (GSH) is known to be involved in the metabolism of many methylated forms of selenium. In this study, we investigated the role of intracellular GSH in methylseleninic acid (MSeA)-induced apoptosis in human hepatoma (HepG(2)) cells. MSeA was shown to deplete intracellular GSH rapidly, preceding the typical apoptotic changes such as DNA fragmentation as measured by the TUNEL assay. When the intracellular GSH concentration was enhanced using N-acetylcysteiene (NAC) (a GSH synthesis precursor) and decreased using buthionine sufoxamine (BSO) (a GSH synthesis inhibitor), NAC markedly augmented MSeA-induced apoptosis, while BSO significantly inhibited MSeA-induced apoptosis. Different from the effect of sodium selenite, there was no measurable superoxide radical level in MSeA-treated cells. These observations suggest that intracellular GSH mainly acts as a cofactor to facilitate MSeA-induced apoptosis, while its antioxidant function becomes largely irrelevant. It is thus postulated that some cancer cells, such as liver cancer cells with higher level of intracellular GSH, would be more susceptible to MSeA cytotoxicity.
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Affiliation(s)
- Han-Ming Shen
- Department of Community, Occupational, and Family Medicine, National University of Singapore, Republic of Singapore.
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Li Y, Meyer EM, Walker DW, Millard WJ, He YJ, King MA. Alpha7 nicotinic receptor activation inhibits ethanol-induced mitochondrial dysfunction, cytochrome c release and neurotoxicity in primary rat hippocampal neuronal cultures. J Neurochem 2002; 81:853-8. [PMID: 12065644 DOI: 10.1046/j.1471-4159.2002.00891.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Primary hippocampal neuronal cultures exhibited a concentration- and time-dependent loss of cells when exposed to ethanol (EtOH). EtOH-induced neurotoxicity was attenuated by 2,4-dimethoxybenzilidene anabaseine (DMXB) which selectively activates alpha7 nicotinic receptors in a concentration-dependent manner. We further investigated the mechanisms of the protective effect of DMXB on EtOH- induced neurotoxicity. We found that EtOH decreased the mitochondrial membrane potential and released cytochrome c from mitochondria at neurotoxic concentrations. DMXB (3 microm) attenuated both of these actions in a manner that was in turn blocked with the nicotinic antagonist methyllyconitine (MLA) 100 nm. Neither DMXB nor MLA alone affected these parameters. These results suggest that the neuroprotection conferred by alpha7 nicotinic receptor activation may be mediated, at least in part, through preventing the decrease in the mitochondrial membrane potential and the increase in the release of cytochrome c caused by EtOH.
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Affiliation(s)
- Yangxin Li
- Department of Internal Medicine, School of Medicine, Southern Illinois University, Springfield, IL 62707, USA.
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