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Raninga PV, He Y, Datta KK, Lu X, Maheshwari UR, Venkat P, Mayoh C, Gowda H, Kalimutho M, Hooper JD, Khanna KK. Combined thioredoxin reductase and glutaminase inhibition exerts synergistic anti-tumor activity in MYC-high high-grade serous ovarian carcinoma. Mol Ther 2023; 31:729-743. [PMID: 36560881 PMCID: PMC10014232 DOI: 10.1016/j.ymthe.2022.12.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 11/10/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022] Open
Abstract
Approximately 50%-55% of high-grade serous ovarian carcinoma (HGSOC) patients have MYC oncogenic pathway activation. Because MYC is not directly targetable, we have analyzed molecular pathways enriched in MYC-high HGSOC tumors to identify potential therapeutic targets. Here, we report that MYC-high HGSOC tumors show enrichment in genes controlled by NRF2, an antioxidant signaling pathway, along with increased thioredoxin redox activity. Treatment of MYC-high HGSOC tumors cells with US Food and Drug Administration (FDA)-approved thioredoxin reductase 1 (TrxR1) inhibitor auranofin resulted in significant growth suppression and apoptosis in MYC-high HGSOC cells in vitro and also significantly reduced tumor growth in an MYC-high HGSOC patient-derived tumor xenograft. We found that auranofin treatment inhibited glycolysis in MYC-high cells via oxidation-induced GAPDH inhibition. Interestingly, in response to auranofin-induced glycolysis inhibition, MYC-high HGSOC cells switched to glutamine metabolism for survival. Depletion of glutamine with either glutamine starvation or glutaminase (GLS1) inhibitor CB-839 exerted synergistic anti-tumor activity with auranofin in HGSOC cells and OVCAR-8 cell line xenograft. These findings suggest that applying a combined therapy of GLS1 inhibitor and TrxR1 inhibitor could effectively treat MYC-high HGSOC patients.
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Affiliation(s)
- Prahlad V Raninga
- QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, Brisbane, QLD 4006, Australia.
| | - Yaowu He
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia
| | - Keshava K Datta
- Proteomics and Metabolomics Platform, La Trobe University, Melbourne, VIC 3086, Australia
| | - Xue Lu
- QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, Brisbane, QLD 4006, Australia
| | - Uma R Maheshwari
- QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, Brisbane, QLD 4006, Australia
| | - Pooja Venkat
- Children's Cancer Institute, Lowy Cancer Centre, UNSW Sydney, Kensington, NSW 2750, Australia
| | - Chelsea Mayoh
- Children's Cancer Institute, Lowy Cancer Centre, UNSW Sydney, Kensington, NSW 2750, Australia
| | - Harsha Gowda
- QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, Brisbane, QLD 4006, Australia
| | - Murugan Kalimutho
- QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, Brisbane, QLD 4006, Australia
| | - John D Hooper
- Mater Research Institute, The University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia
| | - Kum Kum Khanna
- QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, Brisbane, QLD 4006, Australia.
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Han YY, Gu X, Yang CY, Ji HM, Lan YJ, Bi YQ, Si R, Qu J, Cheng MH, Gao J. Protective effect of dimethyl itaconate against fibroblast-myofibroblast differentiation during pulmonary fibrosis by inhibiting TXNIP. J Cell Physiol 2021; 236:7734-7744. [PMID: 34061990 DOI: 10.1002/jcp.30456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 05/01/2021] [Accepted: 05/19/2021] [Indexed: 12/16/2022]
Abstract
Fibroblast-myofibroblast differentiation (FMD) is a critical cellular phenotype during the occurrence and deterioration of pulmonary fibrosis (PF). FMD can increase with an elevated level of reactive oxygen species (ROS) on fibroblasts under oxidative stress. Thioredoxin-interacting protein (TXNIP) is an α-arrestin family protein that regulates the level of intracellular ROS. Nuclear factor erythroid 2-related factor 2 (Nrf2) can protect against FMD in PF. However, the relationship between Nrf2 and TXNIP in FMD remains elusive. Therefore, we established TGF-β1-induced FMD in vitro and bleomycin (BLM)-induced mouse PF model in vivo to explore whether the activation of Nrf2 can inhibit TXNIP-mediated FMD in PF. Dimethyl itaconate (DMI) was selected to activate Nrf2. Our results showed that TXNIP was elevated and FMD was aggravated in mice lung tissues after BLM administration compared with the saline group. Inversely, Nrf2 decreased TXNIP expression and alleviated FMD in PF. In vitro, TXNIP overexpression enhanced FMD and increased the level of ROS. In contrast, TXNIP deficiency by small interfering RNA (siRNA) attenuated TGF-β1-induced FMD and reduced ROS. An increase in ROS by H2 O2 can upregulate TXNIP expression. Moreover, Nrf2 also inhibited TGF-β1-induced FMD and the increase of ROS, with reducing expression of TXNIP, and the inhibitory effect was better than TXNIP siRNA. These results suggest that activation of Nrf2 by DMI can protect against PF via inhibiting TXNIP expression. Our study may provide new therapeutic targets and treatment approaches for PF.
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Affiliation(s)
- Yong-Yue Han
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Xuan Gu
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Chong-Yang Yang
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Hui-Min Ji
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Yue-Jiao Lan
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Yu-Qian Bi
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Rong Si
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Jiao Qu
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Ming-Han Cheng
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
| | - Jian Gao
- The Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China
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Wang X, Wang L, Dong R, Huang K, Wang C, Gu J, Luo H, Liu K, Wu J, Sun H, Meng Q. Luteolin ameliorates LPS-induced acute liver injury by inhibiting TXNIP-NLRP3 inflammasome in mice. Phytomedicine 2021; 87:153586. [PMID: 34044253 DOI: 10.1016/j.phymed.2021.153586] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 04/17/2021] [Accepted: 04/27/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Chemical liver injury is one of the main causes of acute liver failure and death. To date, however, treatment strategies for acute liver injury have been limited. Therefore, there is an urgent need to find new therapeutic targets and effective drugs. NOD-like receptor pyrin domain containing 3 (NLRP3) inflammasome is a complex of multiple proteins that has been shown to induce cell death under inflammatory and stress pathologic conditions and is thought to provide new targets for the treatment of a variety of diseases. PURPOSE The purpose of this study was to investigate whether luteolin has a protective effect on the liver and further elucidate whether it is realized through the thioredoxin interacting protein (TXNIP)-NLRP3 axis. STUDY DESIGN Acute hepatic injury in mice caused by intraperitoneal injection of lipopolysaccharide (LPS) was treated with or without luteolin. METHODS Male C57BL/6 mice and mouse primary hepatocytes were selected. TXNIP protein knockdown was achieved by siRNA, qPCR and Western blot were performed to explore the mechanism of luteolin in alleviating acute liver injury. RESULTS The results indicated that luteolin had a markedly protective effect on acute liver injury induced by LPS in mice by inhibiting the TXNIP-NLRP3 axis. Luteolin inhibits NLRP3 inflammasome activation by suppressing TXNIP, apoptosis associated speck-like protein containing a CARD domain (ASC), caspase-1, interleukin-1β (IL-1β) and IL-18 to reduce liver injury. In addition, luteolin inhibits LPS-induced liver inflammation by inhibiting the production of inflammation-related gene tumor necrosis factor-α (TNF-α), IL-10, and IL-6. What's more, luteolin alleviated LPS-induced hepatocyte injury by inhibiting oxidative stress and regulating MDA, SOD, and GSH levels. However, the protective effect of luteolin on acute LPS-induced liver injury in mice was blocked by si-TXNIP in vitro. CONCLUSIONS These combined data showed that luteolin may alleviate LPS-induced liver injury through the TXNIP-NLPR3 axis, providing new therapeutic targets and therapeutic drugs for subsequent studies.
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Affiliation(s)
- Xiaohui Wang
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Lu Wang
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Renchao Dong
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Kai Huang
- Drug Clinical Trial Institution, the Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Changyuan Wang
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Jiangning Gu
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Dalian Medical University, Dalian 116044, China
| | - Haifeng Luo
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Dalian Medical University, Dalian 116044, China
| | - Kexin Liu
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Jingjing Wu
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Huijun Sun
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Qiang Meng
- Department of Clinical Pharmacology, College of Pharmacy, Dalian Medical University, Dalian 116044, China.
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Zhang W, Zhu Y, Yu H, Liu X, Jiao B, Lu X. Libertellenone H, a Natural Pimarane Diterpenoid, Inhibits Thioredoxin System and Induces ROS-Mediated Apoptosis in Human Pancreatic Cancer Cells. Molecules 2021; 26:molecules26020315. [PMID: 33435380 PMCID: PMC7827531 DOI: 10.3390/molecules26020315] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/28/2020] [Accepted: 01/06/2021] [Indexed: 01/22/2023] Open
Abstract
Libertellenone H (LH), a marine-derived pimarane diterpenoid isolated from arctic fungus Eutypella sp. D-1, has shown effective cytotoxicity on a range of cancer cells. The present study is to explore the anticancer effect of LH on human pancreatic cancer cells and to investigate the intracellular molecular target and underlying mechanism. As shown, LH exhibited anticancer activity in human pancreatic cancer cells by promoting cell apoptosis. Mechanistic studies suggested that LH-induced reactive oxygen species (ROS) accumulation was responsible for apoptosis as antioxidant N-acetylcysteine (NAC) and antioxidant enzyme superoxide dismutase (SOD) antagonized the inhibitory effect of LH. Zymologic testing demonstrated that LH inhibited Trx system but had little effect on the glutathione reductase and glutaredoxin. Mass spectrometry (MS) analysis revealed that the mechanism of action was based on the direct conjugation of LH to the Cys32/Cys35 residue of Trx1 and Sec498 of TrxR, leading to a decrease in the cellular level of glutathione (GSH) and activation of downstream ASK1/JNK signaling pathway. Taken together, our findings revealed LH was a marine derived inhibitor of Trx system and an anticancer candidate.
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Affiliation(s)
- Weirui Zhang
- College of Basic Medical Sciences, Department of Biochemistry and Molecular Biology, Naval Medical University, Shanghai 200433, China; (W.Z.); (H.Y.); (X.L.)
| | - Yuping Zhu
- College of Basic Medical Sciences, Experimental Teacher Center, Naval Medical University, Shanghai 200433, China;
| | - Haobing Yu
- College of Basic Medical Sciences, Department of Biochemistry and Molecular Biology, Naval Medical University, Shanghai 200433, China; (W.Z.); (H.Y.); (X.L.)
| | - Xiaoyu Liu
- College of Basic Medical Sciences, Department of Biochemistry and Molecular Biology, Naval Medical University, Shanghai 200433, China; (W.Z.); (H.Y.); (X.L.)
| | - Binghua Jiao
- College of Basic Medical Sciences, Department of Biochemistry and Molecular Biology, Naval Medical University, Shanghai 200433, China; (W.Z.); (H.Y.); (X.L.)
- Correspondence: (B.J.); (X.L.); Tel.: +86-21-81870970 (ext. 8001) (B.J.); +86-21-81870970 (ext. 8004) (X.L.)
| | - Xiaoling Lu
- College of Basic Medical Sciences, Department of Biochemistry and Molecular Biology, Naval Medical University, Shanghai 200433, China; (W.Z.); (H.Y.); (X.L.)
- Correspondence: (B.J.); (X.L.); Tel.: +86-21-81870970 (ext. 8001) (B.J.); +86-21-81870970 (ext. 8004) (X.L.)
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5
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Dietschreit JCB, Wagner A, Le TA, Klein P, Schindelin H, Opatz T, Engels B, Hellmich UA, Ochsenfeld C. Predicting 19 F NMR Chemical Shifts: A Combined Computational and Experimental Study of a Trypanosomal Oxidoreductase-Inhibitor Complex. Angew Chem Int Ed Engl 2020; 59:12669-12673. [PMID: 32239740 PMCID: PMC7496126 DOI: 10.1002/anie.202000539] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/22/2020] [Indexed: 02/02/2023]
Abstract
The absence of fluorine from most biomolecules renders it an excellent probe for NMR spectroscopy to monitor inhibitor-protein interactions. However, predicting the binding mode of a fluorinated ligand from a chemical shift (or vice versa) has been challenging due to the high electron density of the fluorine atom. Nonetheless, reliable 19 F chemical-shift predictions to deduce ligand-binding modes hold great potential for in silico drug design. Herein, we present a systematic QM/MM study to predict the 19 F NMR chemical shifts of a covalently bound fluorinated inhibitor to the essential oxidoreductase tryparedoxin (Tpx) from African trypanosomes, the causative agent of African sleeping sickness. We include many protein-inhibitor conformations as well as monomeric and dimeric inhibitor-protein complexes, thus rendering it the largest computational study on chemical shifts of 19 F nuclei in a biological context to date. Our predicted shifts agree well with those obtained experimentally and pave the way for future work in this area.
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Affiliation(s)
| | - Annika Wagner
- Dept. ChemistrySection BiochemistryJohannes Gutenberg-Universität Mainz55128MainzGermany
- Centre for Biomolecular Magnetic Resonance (BMRZ)Goethe-University FrankfurtMax-von-Laue Str. 960438FrankfurtGermany
| | - T. Anh Le
- Institute for Physical and Theoretical ChemistryUniversity of WürzburgEmil-Fischer-Straße 4297074WürzburgGermany
| | - Philipp Klein
- Dept. ChemistrySection Organic ChemistryJohannes Gutenberg-Universität Mainz55128MainzGermany
| | - Hermann Schindelin
- Institute of Structural BiologyRudolf Virchow Center for Experimental BiomedicineUniversity of Würzburg97080WürzburgGermany
| | - Till Opatz
- Dept. ChemistrySection Organic ChemistryJohannes Gutenberg-Universität Mainz55128MainzGermany
| | - Bernd Engels
- Institute for Physical and Theoretical ChemistryUniversity of WürzburgEmil-Fischer-Straße 4297074WürzburgGermany
| | - Ute A. Hellmich
- Dept. ChemistrySection BiochemistryJohannes Gutenberg-Universität Mainz55128MainzGermany
- Centre for Biomolecular Magnetic Resonance (BMRZ)Goethe-University FrankfurtMax-von-Laue Str. 960438FrankfurtGermany
| | - Christian Ochsenfeld
- Theoretical ChemistryDepartment of ChemistryUniversity of Munich (LMU)Butenandtstr. 781377MunichGermany
- Max Planck Institute for Solid State Research70569StuttgartGermany
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6
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Yang J, Gong Y, Cai J, Liu Q, Zhang Y, Zheng Y, Yu D, Zhang Z. Dysfunction of thioredoxin triggers inflammation through activation of autophagy in chicken cardiomyocytes. Biofactors 2020; 46:579-590. [PMID: 32031748 DOI: 10.1002/biof.1625] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Accepted: 01/29/2020] [Indexed: 12/13/2022]
Abstract
Thioredoxin (Txn) is a hydrogen carrier protein and exists widely in organism. Txn deficiency implicates cardiomyocytes injury has been proven. However, the exact mechanism remains unclear. To understand the mechanistic response of cardiomyocytes subsequent to Txn suppression, we established the model of Txn dysfunction by employing gene interference technology (siRNA) and Txn inhibitor (PX-12) in cardiomyocytes. We detected the ROS levels, inflammation factors, and key proteins in the autophagy and apoptosis. In addition, heat map was used for further analysis. Our results revealed that Txn dysfunction increased the release of ROS and induced activation of autophagy via upregulation of Becline-1, LC3-1, 2, which further regulated the inflammatory response, meanwhile, Txn silence inhibited apoptosis in chicken cardiomyocytes through Caspase-3 inhibition. Altogether we concluded that Txn-deficient chicken cardiomyocytes experienced autophagy, which caused severe inflammatory reactions and resulting in damage to cardiomyocytes.
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Affiliation(s)
- Jie Yang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Yafan Gong
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Jingzeng Cai
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Qi Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Yuan Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Yingying Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Dahai Yu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
| | - Ziwei Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
- Key Laboratory of the Provincial Education Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural University, Harbin, People's Republic of China
- Key Laboratory of Animal Cellular and Genetic Engineering of Heilongjiang Province, Northeast Agricultural University, Harbin, People's Republic of China
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7
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Currier RB, Ulrich K, Leroux AE, Dirdjaja N, Deambrosi M, Bonilla M, Ahmed YL, Adrian L, Antelmann H, Jakob U, Comini MA, Krauth-Siegel RL. An essential thioredoxin-type protein of Trypanosoma brucei acts as redox-regulated mitochondrial chaperone. PLoS Pathog 2019; 15:e1008065. [PMID: 31557263 PMCID: PMC6783113 DOI: 10.1371/journal.ppat.1008065] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 10/08/2019] [Accepted: 09/02/2019] [Indexed: 12/22/2022] Open
Abstract
Most known thioredoxin-type proteins (Trx) participate in redox pathways, using two highly conserved cysteine residues to catalyze thiol-disulfide exchange reactions. Here we demonstrate that the so far unexplored Trx2 from African trypanosomes (Trypanosoma brucei) lacks protein disulfide reductase activity but functions as an effective temperature-activated and redox-regulated chaperone. Immunofluorescence microscopy and fractionated cell lysis revealed that Trx2 is located in the mitochondrion of the parasite. RNA-interference and gene knock-out approaches showed that depletion of Trx2 impairs growth of both mammalian bloodstream and insect stage procyclic parasites. Procyclic cells lacking Trx2 stop proliferation under standard culture conditions at 27°C and are unable to survive prolonged exposure to 37°C, indicating that Trx2 plays a vital role that becomes augmented under heat stress. Moreover, we found that Trx2 contributes to the in vivo infectivity of T. brucei. Remarkably, a Trx2 version, in which all five cysteines were replaced by serine residues, complements for the wildtype protein in conditional knock-out cells and confers parasite infectivity in the mouse model. Characterization of the recombinant protein revealed that Trx2 can coordinate an iron sulfur cluster and is highly sensitive towards spontaneous oxidation. Moreover, we discovered that both wildtype and mutant Trx2 protect other proteins against thermal aggregation and preserve their ability to refold upon return to non-stress conditions. Activation of the chaperone function of Trx2 appears to be triggered by temperature-mediated structural changes and inhibited by oxidative disulfide bond formation. Our studies indicate that Trx2 acts as a novel chaperone in the unique single mitochondrion of T. brucei and reveal a new perspective regarding the physiological function of thioredoxin-type proteins in trypanosomes.
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Affiliation(s)
- Rachel B. Currier
- Biochemie-Zentrum der Universität Heidelberg (BZH), Heidelberg, Germany
| | - Kathrin Ulrich
- Biochemie-Zentrum der Universität Heidelberg (BZH), Heidelberg, Germany
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | | | - Natalie Dirdjaja
- Biochemie-Zentrum der Universität Heidelberg (BZH), Heidelberg, Germany
| | - Matías Deambrosi
- Group Redox Biology of Trypanosomes, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Mariana Bonilla
- Group Redox Biology of Trypanosomes, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Laboratorio de Fisicoquímica Biológica, Instituto de Química Biológica, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | | | - Lorenz Adrian
- Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research–UFZ, Leipzig, Germany
- Fachgebiet Geobiotechnologie, Technische Universität Berlin, Berlin, Germany
| | - Haike Antelmann
- Institut für Biologie-Mikrobiologie, Freie Universität Berlin, Berlin, Germany
| | - Ursula Jakob
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Marcelo A. Comini
- Group Redox Biology of Trypanosomes, Institut Pasteur de Montevideo, Montevideo, Uruguay
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8
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Llabani E, Hicklin RW, Lee HY, Motika SE, Crawford LA, Weerapana E, Hergenrother PJ. Diverse compounds from pleuromutilin lead to a thioredoxin inhibitor and inducer of ferroptosis. Nat Chem 2019; 11:521-532. [PMID: 31086302 PMCID: PMC6639018 DOI: 10.1038/s41557-019-0261-6] [Citation(s) in RCA: 141] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 03/25/2019] [Indexed: 02/08/2023]
Abstract
The chemical diversification of natural products provides a robust and general method for the creation of stereochemically rich and structurally diverse small molecules. The resulting compounds have physicochemical traits different from those in most screening collections, and as such are an excellent source for biological discovery. Herein, we subject the diterpene natural product pleuromutilin to reaction sequences focused on creating ring system diversity in few synthetic steps. This effort resulted in a collection of compounds with previously unreported ring systems, providing a novel set of structurally diverse and highly complex compounds suitable for screening in a variety of different settings. Biological evaluation identified the novel compound ferroptocide, a small molecule that rapidly and robustly induces ferroptotic death of cancer cells. Target identification efforts and CRISPR knockout studies reveal that ferroptocide is an inhibitor of thioredoxin, a key component of the antioxidant system in the cell. Ferroptocide positively modulates the immune system in a murine model of breast cancer and will be a useful tool to study the utility of pro-ferroptotic agents for treatment of cancer.
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Affiliation(s)
- Evijola Llabani
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Robert W Hicklin
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Hyang Yeon Lee
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Stephen E Motika
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Lisa A Crawford
- Department of Chemistry, Boston College, Chestnut Hill, MA, USA
| | | | - Paul J Hergenrother
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA.
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9
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Abstract
The chemical diversification of natural products provides a robust and general method for the creation of stereochemically rich and structurally diverse small molecules. The resulting compounds have physicochemical traits different from those in most screening collections, and as such are an excellent source for biological discovery. Herein, we subject the diterpene natural product pleuromutilin to reaction sequences focused on creating ring system diversity in few synthetic steps. This effort resulted in a collection of compounds with previously unreported ring systems, providing a novel set of structurally diverse and highly complex compounds suitable for screening in a variety of different settings. Biological evaluation identified the novel compound ferroptocide, a small molecule that rapidly and robustly induces ferroptotic death of cancer cells. Target identification efforts and CRISPR knockout studies reveal that ferroptocide is an inhibitor of thioredoxin, a key component of the antioxidant system in the cell. Ferroptocide positively modulates the immune system in a murine model of breast cancer and will be a useful tool to study the utility of pro-ferroptotic agents for treatment of cancer.
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Affiliation(s)
- Evijola Llabani
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Robert W Hicklin
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Hyang Yeon Lee
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Stephen E Motika
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA
| | - Lisa A Crawford
- Department of Chemistry, Boston College, Chestnut Hill, MA, USA
| | | | - Paul J Hergenrother
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA.
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10
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Wang H, Jiang H, Corbet C, de Mey S, Law K, Gevaert T, Feron O, De Ridder M. Piperlongumine increases sensitivity of colorectal cancer cells to radiation: Involvement of ROS production via dual inhibition of glutathione and thioredoxin systems. Cancer Lett 2019; 450:42-52. [PMID: 30790679 DOI: 10.1016/j.canlet.2019.02.034] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 02/08/2019] [Accepted: 02/14/2019] [Indexed: 01/19/2023]
Abstract
Piperlongumine (PL), naturally synthesized in long pepper, is known to selectively kill tumor cells via perturbation of reactive oxygen species (ROS) homeostasis. ROS are the primary effector molecules of radiation, and increase of ROS production by pharmacological modulation is known to enhance radioresponse. We therefore investigated the radiosensitizing effect of PL in colorectal cancer cells (CT26 and DLD-1) and CT26 tumor-bearing mice. Firstly, we found that PL induced excessive production of ROS due to depletion of glutathione and inhibition of thioredoxin reductase. Secondly, PL enhanced both the intrinsic and hypoxic radiosensitivity of tumor cells, linked to ROS-mediated increase of DNA damage, G2/M cell cycle arrest, and inhibition of cellular respiration. Finally, the radiosensitizing effect of PL was verified in vivo. PL improved the tumor response to both single and fractionated radiation, resulting in a significant increase of survival rate of tumor-bearing mice, while it was ineffective on its own. In line with in vitro findings, enhanced radioresponse is associated with inhibition of antioxidant systems. In conclusion, our results suggest that PL could be a potential radiosensitizer in colorectal cancer.
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Affiliation(s)
- Hui Wang
- Department of Radiotherapy, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Heng Jiang
- Department of Radiotherapy, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Cyril Corbet
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
| | - Sven de Mey
- Department of Radiotherapy, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Kalun Law
- Department of Radiotherapy, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Thierry Gevaert
- Department of Radiotherapy, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Olivier Feron
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, Brussels, Belgium
| | - Mark De Ridder
- Department of Radiotherapy, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium.
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11
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Booty LM, Gawel JM, Cvetko F, Caldwell ST, Hall AR, Mulvey JF, James AM, Hinchy EC, Prime TA, Arndt S, Beninca C, Bright TP, Clatworthy MR, Ferdinand JR, Prag HA, Logan A, Prudent J, Krieg T, Hartley RC, Murphy MP. Selective Disruption of Mitochondrial Thiol Redox State in Cells and In Vivo. Cell Chem Biol 2019; 26:449-461.e8. [PMID: 30713096 PMCID: PMC6436940 DOI: 10.1016/j.chembiol.2018.12.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Revised: 11/06/2018] [Accepted: 12/03/2018] [Indexed: 02/02/2023]
Abstract
Mitochondrial glutathione (GSH) and thioredoxin (Trx) systems function independently of the rest of the cell. While maintenance of mitochondrial thiol redox state is thought vital for cell survival, this was not testable due to the difficulty of manipulating the organelle's thiol systems independently of those in other cell compartments. To overcome this constraint we modified the glutathione S-transferase substrate and Trx reductase (TrxR) inhibitor, 1-chloro-2,4-dinitrobenzene (CDNB) by conjugation to the mitochondria-targeting triphenylphosphonium cation. The result, MitoCDNB, is taken up by mitochondria where it selectively depletes the mitochondrial GSH pool, catalyzed by glutathione S-transferases, and directly inhibits mitochondrial TrxR2 and peroxiredoxin 3, a peroxidase. Importantly, MitoCDNB inactivates mitochondrial thiol redox homeostasis in isolated cells and in vivo, without affecting that of the cytosol. Consequently, MitoCDNB enables assessment of the biomedical importance of mitochondrial thiol homeostasis in reactive oxygen species production, organelle dynamics, redox signaling, and cell death in cells and in vivo.
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Affiliation(s)
- Lee M Booty
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Justyna M Gawel
- School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK
| | - Filip Cvetko
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | | | - Andrew R Hall
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - John F Mulvey
- Department of Medicine, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Andrew M James
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Elizabeth C Hinchy
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Tracy A Prime
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Sabine Arndt
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Cristiane Beninca
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Thomas P Bright
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | | | - John R Ferdinand
- Department of Medicine, University of Cambridge, Cambridge CB2 0QQ, UK
| | - Hiran A Prag
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Angela Logan
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Julien Prudent
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK
| | - Thomas Krieg
- Department of Medicine, University of Cambridge, Cambridge CB2 0QQ, UK
| | | | - Michael P Murphy
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0XY, UK; Department of Medicine, University of Cambridge, Cambridge CB2 0QQ, UK.
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12
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Song Y, Sun R, Ji Z, Li X, Fu Q, Ma S. Perilla aldehyde attenuates CUMS-induced depressive-like behaviors via regulating TXNIP/TRX/NLRP3 pathway in rats. Life Sci 2018; 206:117-124. [PMID: 29800538 DOI: 10.1016/j.lfs.2018.05.038] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 05/11/2018] [Accepted: 05/21/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Current evidence supports that inflammatory reaction in the hippocampus is a potential cause of major depressive disorder (MDD). Perilla aldehyde (PAH), a major constituent from Perilla frutescens, has been reported to have anti-inflammatory and anti-oxidant activity. The aim of this study is to explore the antidepressant-like effect and the underlying mechanism of PAH on the rats model induced by chronic unpredictable mild stress (CUMS). METHODS CUMS rats model was built to tested their depressive-like behaviors. The levels of pro-inflammatory cytokines were tested. Proteins were analyzed by Western blot and Immunohistochemistry. RESULTS We found that treatment with PAH (20, 40 mg/kg) and fluoxetine (FLU, 10 mg/kg) significantly improved the sucrose consumption, immobility time in forced swim test (FST), as well as locomotor activity in open-field test (OFT). The levels of pro-inflammatory cytokines in hippocampus were also suppressed effectively by PAH and FLU administration. Western blot analysis showed the up-regulated levels of TXNIP, NLRP3, Cleaved caspase-1 and p-NF-κB p65 in the hippocampus in rats exposed to CUMS paradigm, while different degrees of down-regulation in their expression were detected after PAH (20, 40 mg/kg) and FLU (10 mg/kg) treatment respectively. The results from histopathological examination further demonstrated that PAH (20, 40 mg/kg) and FLU (10 mg/kg) treatment reversed the alteration of TRX, NLRP3 and Cleaved caspase-1 induced by CUMS procedure. CONCLUSIONS Our results demonstrated that PAH exhibited antidepressant-like effect in CUMS-induced rats model of depression, which might be mediated by TXNIP/TRX/NLRP3 pathway.
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Affiliation(s)
- Yichen Song
- Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing 210009, PR China
| | - Ruoxi Sun
- Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing 210009, PR China
| | - Zhouye Ji
- Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing 210009, PR China
| | - Xiaoxi Li
- Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing 210009, PR China
| | - Qiang Fu
- Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing 210009, PR China.
| | - Shiping Ma
- Department of Pharmacology of Chinese Materia Medica, China Pharmaceutical University, Nanjing 210009, PR China; Qinba Traditional Chinese Medicine Resources Research and Development Center, AnKang University, AnKang 725000, PR China.
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13
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Goemans CV, Beaufay F, Wahni K, Van Molle I, Messens J, Collet JF. An essential thioredoxin is involved in the control of the cell cycle in the bacterium Caulobacter crescentus. J Biol Chem 2018; 293:3839-3848. [PMID: 29367337 PMCID: PMC5846133 DOI: 10.1074/jbc.ra117.001042] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 01/23/2018] [Indexed: 11/06/2022] Open
Abstract
Thioredoxins (Trxs) are antioxidant proteins that are conserved among all species. These proteins have been extensively studied and perform reducing reactions on a broad range of substrates. Here, we identified Caulobacter crescentus Trx1 (CCNA_03653; CcTrx1) as an oxidoreductase that is involved in the cell cycle progression of this model bacterium and is required to sustain life. Intriguingly, the abundance of CcTrx1 varies throughout the C. crescentus cell cycle: although the expression of CcTrx1 is induced in stalked cells, right before DNA replication initiation, CcTrx1 is actively degraded by the ClpXP protease in predivisional cells. Importantly, we demonstrated that regulation of the abundance of CcTrx1 is crucial for cell growth and survival as modulating CcTrx1 levels leads to cell death. Finally, we also report a comprehensive biochemical and structural characterization of this unique and essential Trx. The requirement to precisely control the abundance of CcTrx1 for cell survival underlines the importance of redox control for optimal cell cycle progression in C. crescentus.
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Affiliation(s)
- Camille V Goemans
- From WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium,
- the de Duve Institute, Université catholique de Louvain, Avenue Hippocrate 75, 1200 Brussels, Belgium
- the Brussels Center for Redox Biology, 1200 Brussels, Belgium
| | - François Beaufay
- the de Duve Institute, Université catholique de Louvain, Avenue Hippocrate 75, 1200 Brussels, Belgium
| | - Khadija Wahni
- the Brussels Center for Redox Biology, 1200 Brussels, Belgium
- the Center for Structural Biology, Vlaams Instituut voor Biotechnologie (VIB), 1050 Brussels, Belgium, and
- Structural Biology Brussels, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Inge Van Molle
- the Brussels Center for Redox Biology, 1200 Brussels, Belgium
- the Center for Structural Biology, Vlaams Instituut voor Biotechnologie (VIB), 1050 Brussels, Belgium, and
- Structural Biology Brussels, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Joris Messens
- the Brussels Center for Redox Biology, 1200 Brussels, Belgium
- the Center for Structural Biology, Vlaams Instituut voor Biotechnologie (VIB), 1050 Brussels, Belgium, and
- Structural Biology Brussels, Vrije Universiteit Brussel, 1050 Brussels, Belgium
| | - Jean-François Collet
- From WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium,
- the de Duve Institute, Université catholique de Louvain, Avenue Hippocrate 75, 1200 Brussels, Belgium
- the Brussels Center for Redox Biology, 1200 Brussels, Belgium
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14
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Tian D, Dong J, Jin S, Teng X, Wu Y. Endogenous hydrogen sulfide-mediated MAPK inhibition preserves endothelial function through TXNIP signaling. Free Radic Biol Med 2017; 110:291-299. [PMID: 28669627 DOI: 10.1016/j.freeradbiomed.2017.06.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 06/03/2017] [Accepted: 06/26/2017] [Indexed: 12/20/2022]
Abstract
Mounting evidence demonstrated deficient cystathionine-γ-lyase (CSE)/H2S implicated the development of cardiovascular disease. The present study aimed to evaluating the favorable action of CSE derived H2S on endothelial function in CSE-/- mice. CSE-/- mice exhibited attenuated endothelium-dependent relaxations, coupled with reduction of endothelial nitric oxide synthase (eNOS) phosphorylation at site of Ser1177, increase of thioredoxin interacting protein (TXNIP) level and MAPK phosphorylation, which were corrected by sodium hydrosulfide chronic treatment for 8 weeks. Impaired relaxations to ACh and upregulated TXNIP of CSE-/- mice aorta were partially corrected by p38 inhibitor, extracellular regulated protein kinase (ERK) inhibitor and c-Jun N-terminal kinase (JNK) inhibitor and totally corrected by combined treatment. Pharmacological inhibition of CSE with DL-propargylglycine (PPG) in vivo and ex vivo induced endothelial dysfunction. PPG stimulated the phosphorylation of p38, JNK and ERK in human umbilical vein endothelial cells (HUVECs). MAPK inhibition by combined treatment of p38, JNK and ERK inhibitors normalized the endothelial changes of eNOS phosphorylation and TXNIP protein level in CSE-/- mice aorta and PPG-treated HUVECs. NaHS offered similar effect with MAKP inhibitors. TXNIP siRNA prevented against endothelial function by PPG and TXNIP overexpression mimics the detrimental effect of PPG treatment on endothelial function, whereas MAPK inhibitor or NaHS has no beneficial effect. In a word, Endogenous CSE/H2S benefits against endothelial dysfunction through suppressing MAPK/TXNIP cascade. CSE deficiency and consequently lowered endogenous H2S level should be considered as risk factors and biomarkers for endothelial dysfunction.
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Affiliation(s)
- Danyang Tian
- Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Jinghui Dong
- Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Sheng Jin
- Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Xu Teng
- Department of Physiology, Hebei Medical University, Shijiazhuang, China
| | - Yuming Wu
- Department of Physiology, Hebei Medical University, Shijiazhuang, China; Hebei Collaborative Innovation Center for Cardio-Cerebrovascular Disease, Shijiazhuang 050017, China.
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15
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Jakobs P, Serbulea V, Leitinger N, Eckers A, Haendeler J. Nuclear Factor (Erythroid-Derived 2)-Like 2 and Thioredoxin-1 in Atherosclerosis and Ischemia/Reperfusion Injury in the Heart. Antioxid Redox Signal 2017; 26:630-644. [PMID: 27923281 PMCID: PMC5397216 DOI: 10.1089/ars.2016.6795] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 11/08/2016] [Accepted: 12/05/2016] [Indexed: 01/04/2023]
Abstract
SIGNIFICANCE Redox signaling is one of the key elements involved in cardiovascular diseases. Two important molecules are the transcription factor nuclear factor erythroid 2-related factor 2 (Nrf2) and the oxidoreductase thioredoxin-1 (Trx-1). Recent Advances: During the previous years, a lot of studies investigated Nrf2 and Trx-1 as protective proteins in cardiovascular disorders. Moreover, post-translational modifications of those molecules were identified that play an important role in the cardiovascular system. This review will summarize changes in the vasculature in atherosclerosis and ischemia reperfusion injury of the heart and the newest findings achieved with Nrf2 and Trx-1 therein. Interestingly, Nrf2 and Trx-1 can act together as well as independently of each other in protection against atherosclerosis and ischemia and reperfusion injury. CRITICAL ISSUES In principle, pharmacological activation of a transcription factor-like Nrf2 can be dangerous, since a transcription regulator has multiple targets and the pleiotropic effects of such activation should not be ignored. Moreover, overactivation of Nrf2 as well as long-term treatment with Trx-1 could be deleterious for the cardiovascular system. FUTURE DIRECTIONS Therefore, the length of treatment with Nrf2 activators and/or Trx-1 has first to be studied in more detail in cardiovascular disorders. Moreover, a combination of Nrf2 activators and Trx-1 should be investigated and taken into consideration. Antioxid. Redox Signal. 26, 630-644.
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Affiliation(s)
- Philipp Jakobs
- IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Vlad Serbulea
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia
| | - Norbert Leitinger
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia
- Cardiovascular Research Center, University of Virginia, Charlottesville, Virginia
| | - Anna Eckers
- IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
| | - Judith Haendeler
- IUF-Leibniz Research Institute for Environmental Medicine, Duesseldorf, Germany
- Central Institute of Clinical Chemistry and Laboratory Medicine, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany
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16
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Roh T, Kim SW, Moon SH, Nam MJ. Genistein induces apoptosis by down-regulating thioredoxin-1 in human hepatocellular carcinoma SNU-449 cells. Food Chem Toxicol 2016; 97:127-134. [PMID: 27597132 DOI: 10.1016/j.fct.2016.09.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 08/29/2016] [Accepted: 09/01/2016] [Indexed: 11/17/2022]
Abstract
Genistein (GEN), a natural isoflavonoid phytoestrogen, has anti-cancer activity against various types of cancers. However, GEN has not been thoroughly investigated in human hepatocellular carcinoma cells. In this study, we evaluated the anti-cancer effects of GEN on SNU-449 cells. GEN inhibited the proliferation of SNU-449 cells in a concentration-dependent manner. We observed the typical characteristics of apoptosis, such as DNA fragmentation and caspase-3 activation. To identify proteins related to GEN-induced apoptosis, we performed two-dimensional electrophoresis and identified differentially expressed proteins. Proteomic analysis showed that the antioxidant protein thioredoxin-1 was associated with GEN-induced apoptosis. GEN treatment decreased thioredoxin-1 levels and increased intracellular accumulation of reactive oxygen species. In addition, GEN activated apoptosis signal-regulating kinase 1, c-Jun N-terminal kinases (JNK) and p38. We also observed that pretreatment with the JNK and p38 inhibitors (SP600125 and SB203580) decreased GEN-induced cell death. These results indicate that GEN has potential antitumor effects against SNU-449 cells through the down-regulation of thioredoxin-1.
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Affiliation(s)
- Taylor Roh
- Department of Biological Science, Gachon University, 1342, Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 461-701, Republic of Korea
| | - Sung Won Kim
- Department of Biological Science, Gachon University, 1342, Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 461-701, Republic of Korea
| | - Soung Hoon Moon
- Department of Biological Science, Gachon University, 1342, Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 461-701, Republic of Korea
| | - Myeong Jin Nam
- Department of Biological Science, Gachon University, 1342, Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 461-701, Republic of Korea.
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17
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Parsonage D, Sheng F, Hirata K, Debnath A, McKerrow JH, Reed SL, Abagyan R, Poole LB, Podust LM. X-ray structures of thioredoxin and thioredoxin reductase from Entamoeba histolytica and prevailing hypothesis of the mechanism of Auranofin action. J Struct Biol 2016; 194:180-90. [PMID: 26876147 PMCID: PMC5003402 DOI: 10.1016/j.jsb.2016.02.015] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 02/09/2016] [Accepted: 02/11/2016] [Indexed: 11/29/2022]
Abstract
The anti-arthritic gold-containing drug Auranofin is lethal to the protozoan intestinal parasite Entamoeba histolytica, the causative agent of human amebiasis, in both culture and animal models of the disease. A putative mechanism of Auranofin action proposes that monovalent gold, Au(I), released from the drug, can bind to the redox-active dithiol group of thioredoxin reductase (TrxR). Au(I) binding in the active site is expected to prevent electron transfer to the downstream substrate thioredoxin (Trx), thus interfering with redox homeostasis in the parasite. To clarify the molecular mechanism of Auranofin action in more detail, we determined a series of atomic resolution X-ray structures for E. histolytica thioredoxin (EhTrx) and thioredoxin reductase (EhTrxR), the latter with and without Auranofin. Only the disulfide-bonded form of the active site dithiol (Cys(140)-Cys(143)) was invariably observed in crystals of EhTrxR in spite of the addition of reductants in various crystallization trials, and no gold was found associated with these cysteines. Non-catalytic Cys(286) was identified as the only site of modification, but further mutagenesis studies using the C286Q mutant demonstrated that this site was not responsible for inhibition of EhTrxR by Auranofin. Interestingly, we obtained both of the catalytically-relevant conformations of this bacterial-like, low molecular weight TrxR in crystals without requiring an engineered disulfide linkage between Cys mutants of TrxR and Trx (as was originally done with Escherichia coli TrxR and Trx). We note that the -CXXC- catalytic motif, even if reduced, would likely not provide space sufficient to bind Au(I) by both cysteines of the dithiol group.
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Affiliation(s)
- Derek Parsonage
- Department of Biochemistry, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Fang Sheng
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Ken Hirata
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA; Department of Pathology, University of California San Diego, La Jolla, CA, USA
| | - Anjan Debnath
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - James H McKerrow
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Sharon L Reed
- Department of Pathology, University of California San Diego, La Jolla, CA, USA; Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Ruben Abagyan
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA
| | - Leslie B Poole
- Department of Biochemistry, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Larissa M Podust
- Center for Discovery and Innovation in Parasitic Diseases, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, USA.
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18
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Zhao L, Li W, Zhou Y, Zhang Y, Huang S, Xu X, Li Z, Guo Q. The overexpression and nuclear translocation of Trx-1 during hypoxia confers on HepG2 cells resistance to DDP, and GL-V9 reverses the resistance by suppressing the Trx-1/Ref-1 axis. Free Radic Biol Med 2015; 82:29-41. [PMID: 25656992 DOI: 10.1016/j.freeradbiomed.2015.01.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 12/27/2014] [Accepted: 01/19/2015] [Indexed: 12/16/2022]
Abstract
Microenvironmental hypoxia gives many tumor cells the capacity for drug resistance. Thioredoxin family members play critical roles in the regulation of cellular redox homeostasis in a stressed environment. In this study, we established a hypoxia-drug resistance (hypoxia-DR) model using HepG2 cells and discovered that the overexpression and nuclear translocation of thioredoxin-1 (Trx-1) are closely associated with this resistance through the regulation of the metabolism by the oxidative stress response to glycolysis. Intranuclear Trx-1 enhances the DNA-binding activity of HIF-1α via its interaction with and reducing action on Ref-1, resulting in increased expression of glycolysis-related proteins (PDHK1, HKII, and LDHA), glucose uptake, and lactate generation under hypoxia. Meanwhile, we found that GL-V9, a newly synthesized flavonoid derivative, shows an ability to reverse the hypoxia-DR and has low toxicity both in vivo and in vitro. GL-V9 could inhibit the expression and nuclear translocation of Trx-1 and then suppress HIF-1α DNA-binding activity by inhibiting the Trx-1/Ref-1 axis. As a result, glycolysis is weakened and oxidative phosphorylation is enhanced. Thus, GL-V9 leads to an increment in intracellular ROS generation and consequently intensified apoptosis induced by DDP.
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Affiliation(s)
- Li Zhao
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education
| | - Wei Li
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education
| | - Yuxin Zhou
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education
| | - Yi Zhang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education
| | - Shaoliang Huang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education
| | - Xuefen Xu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education
| | - Zhiyu Li
- School of Pharmacy, China Pharmaceutical University, Nanjing 210009, People׳s Republic of China
| | - Qinglong Guo
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, Jiangsu Key Laboratory of Design and Optimization, Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education.
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19
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Wu X, Li L, Zhang L, Wu J, Zhou Y, Zhou Y, Zhao Y, Zhao J. Inhibition of thioredoxin-1 with siRNA exacerbates apoptosis by activating the ASK1-JNK/p38 pathway in brain of a stroke model rats. Brain Res 2014; 1599:20-31. [PMID: 25541364 DOI: 10.1016/j.brainres.2014.12.033] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Revised: 11/19/2014] [Accepted: 12/13/2014] [Indexed: 12/14/2022]
Abstract
Apoptosis is critical for the development of cerebral ischemia/reperfusion injury. Thioredoxin-1(Trx-1) protein has been reported to have anti-apoptotic effects in a variety of cell types, and it has been implicated in brain injury after middle cerebral artery occlusion (MCAO). Thus, we studied the effects of Trx1 silencing after MCAO in rats and examined whether inhibition of endogenous Trx1 could increase tissue levels of apoptosis. Male Sprague-Dawley rats (N=170) were subjected to 1h of middle cerebral arterial occlusion followed by 24h of reperfusion. Trx1 siRNAs were injected into rat brains 24h prior to MCAO. Then, 24h after MCAO, brains were collected from euthanized rats for investigation. Treatment with Trx1 siRNA significantly increased mortality, behavioral deficits, and cerebral infarction volume and exacerbated neuronal cell apoptotic death after MCAO injury. Western blot revealed increased expression of apoptotic proteins such as P-ASK1, P-JNK, P-p38, cleaved caspase-3 and increased the level of cytochrome c in the cytosolic fraction in the Trx1 siRNA-treated group. Co-immunoprecipitation assay suggested an interaction between Trx1 and ASK1 in normal rat brains and Trx1 siRNA dissociated ASK1-Trx1 binding complex. Our data suggest that Trx1 siRNA increases apoptotic stress-induced ASK1 activation and this represents further evidence that Trx1 is an endogenous anti-apoptotic molecule that diminishes focal cerebral ischemia/reperfusion injury. Its mechanism of action is likely related to attenuation of the ASK1-JNK/p38 signaling pathway.
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Affiliation(s)
- Xiaoying Wu
- Department of Pathophysiology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Lingyu Li
- Department of Pathophysiology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Luyu Zhang
- Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Jingxian Wu
- Department of Pathology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Yunchuan Zhou
- Department of Pathology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Yang Zhou
- Department of Pathology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Yong Zhao
- Department of Pathology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China
| | - Jing Zhao
- Department of Pathophysiology, Chongqing Medical University, Chongqing, People׳s Republic of China; Institute of Neuroscience, Chongqing Medical University, Chongqing, People׳s Republic of China.
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20
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Tan Y, Bi L, Zhang P, Wang F, Lin F, Ni W, Wu J, Jiang L. Thioredoxin-1 inhibitor PX-12 induces human acute myeloid leukemia cell apoptosis and enhances the sensitivity of cells to arsenic trioxide. Int J Clin Exp Pathol 2014; 7:4765-4773. [PMID: 25197347 PMCID: PMC4152037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 08/02/2014] [Indexed: 06/03/2023]
Abstract
Thioredoxin-1 (Trx-1), an important redox regulatory factor, plays a significant role in drug-induced apoptosis. Here we investigated the effects of the Trx-1 inhibitor 1-methylpropyl 2-imidazolyl disulfide (PX-12) on human acute myeloid leukemia cells (AML) and the sensitivity of cells to arsenic trioxide (As2O3, ATO). Treatment of cells with a different concentration of PX-12 for 48 h resulted in growth inhibition, the induction of apoptosis and increased the levels of activated caspase-3 expression in AML cell lines HL-60, NB4, U937 and primary AML cells in a dose-dependent manner. In addition, PX-12 enhanced the sensitivity of U937 cells to ATO. These results suggest the effects of Trx-1 inhibitor PX-12 to induce apoptosis in AML cells and therapeutic potential in AML by enhancing the sensitivity of cells to ATO.
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Affiliation(s)
- Yingxia Tan
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Laixi Bi
- Department of Hematology, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Peili Zhang
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Fule Wang
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Feiyan Lin
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Wuhua Ni
- Reproductive Medicine Center, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Jianbo Wu
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
| | - Lei Jiang
- Laboratory of Internal Medicine, The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou, Zhejiang 325000, China
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Tsujimori H, Mori K. Synthesis of the Racemate of the Stereoisomer at C-6a of BE-40644, a Bioactive Metabolite of Actinoplanes sp. with a Sesquiterpene-substituted p-Benzoquinone Structure. Biosci Biotechnol Biochem 2014; 65:167-71. [PMID: 11272823 DOI: 10.1271/bbb.65.167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BE-40644 is a tetracyclic metabolite of Actinoplanes sp. A 40644 possessing a sesquiterpene-substituted p-benzoquinone structure with cis-fused B/C ring stereochemistry that inhibits the human thioredoxin system as the well as the growth of several cancer cell lines. Its B/C trans-fused stereoisomer at C-6a was synthesized as a racemate starting from geranylacetone and 3,5-dihydroxybenzoic acid.
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Affiliation(s)
- H Tsujimori
- Department of Chemistry, Faculty of Science, Science University of Tokyo, Japan
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22
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Huang J, Xu J, Tian L, Zhong L. A thioredoxin reductase and/or thioredoxin system-based mechanism for antioxidant effects of ambroxol. Biochimie 2013; 97:92-103. [PMID: 24103200 DOI: 10.1016/j.biochi.2013.09.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 09/26/2013] [Indexed: 11/17/2022]
Abstract
Long-term treatment with ambroxol (ABX), a bronchial expectorant, was found to prevent acute exacerbation of chronic obstructive pulmonary disease (AECOPD). The underlying mechanism remains unclear. To address this, we have investigated the effect of ABX on critical antioxidant proteins thioredoxin (Trx) and thioredoxin reductase (TrxR) that are decreased in patients with AECOPD. Trx, TrxR and NADP(H) form Trx system, which is involved in regulating numerous oxidative stress-related events. In human bronchial epithelial cells, treatment with ABX from 0 to 200 μM gradually increased mRNA and protein levels of TrxR/Trx. At these ABX concentrations, TrxR activity was elevated progressively, whereas Trx activity exhibited a dose-dependent biphasic response, increasing at 50 and 75 μM, but decreasing at ABX over 150 μM. Pre-treatment with 75 μM ABX enhanced the capacity of the cells to eliminate reactive oxygen species, which was largely prevented by knockdown of cytosolic Trx (hTrx1). In a purified system, ABX shortened the initial lag phase during the reduction of insulin disulfide by Trx system. Pre-treatment of NADPH-reduced TrxR with ABX caused a dose- and time-dependent increase in thiolate/selenolate species, i.e. the catalytically active form of TrxR. Kinetic analysis demonstrated that the reduction of H2O2 by TrxR or Trx system were enhanced by 100 or 200 μM ABX. When hTrx1 was mixed with ABX in a molar ratio of 1:1 to 1:100 (which could occur in human plasma), changes in intrinsic Trp fluorescence occurred, and the response of reduced hTrx1 was especially remarkable. These data reveal an ABX-sensing mechanism of TrxR/Trx. We therefore conclude that the antioxidant actions of ABX at physiological concentrations are, at least partially, mediated by TrxR and/or Trx system.
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Affiliation(s)
- Jin Huang
- College of Life Sciences, University of Chinese Academy of Sciences, YuQuan Road 19(A), 100049 Beijing, China
| | - Jianying Xu
- Department of Respiratory Medicine, Dayi Hospital Affiliated to Shanxi Medical University, Longcheng Street 99, 030032 Taiyuan, China
| | - Lin Tian
- School of Public Health, Capital Medical University, 100069 Beijing, China.
| | - Liangwei Zhong
- College of Life Sciences, University of Chinese Academy of Sciences, YuQuan Road 19(A), 100049 Beijing, China.
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Lee SY, Lee HS, Kim EY, Ko JJ, Yoon TK, Lee WS, Lee KA. Thioredoxin-interacting protein regulates glucose metabolism and affects cytoplasmic streaming in mouse oocytes. PLoS One 2013; 8:e70708. [PMID: 23976953 PMCID: PMC3747264 DOI: 10.1371/journal.pone.0070708] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 06/20/2013] [Indexed: 01/01/2023] Open
Abstract
Thioredoxin-interacting protein (Txnip) regulates intracellular redox state and prompts oxidative stress by binding to and inhibiting Thioredoxin (Trx). In addition, via a Trx-independent mechanism, Txnip regulates glucose metabolism and thus maintains intracellular glucose levels. Previously, we found Txnip mRNA highly expressed in immature germinal vesicle (GV) oocytes, but currently there is no report describing the role of Txnip in oocytes. Therefore, we conducted the present study to determine the function of Txnip in mouse oocytes' maturation and meiosis by using RNA interference (RNAi) method. Upon specific depletion of Txnip, 79.5% of oocytes were arrested at metaphase I (MI) stage. Time-lapse video microscopy analysis revealed that the formation of granules in the oocyte cytoplasm increased concurrent with retarded cytoplasmic streaming after Txnip RNAi treatment. Txnip RNAi-treated oocytes had upregulated glucose uptake and lactate production. To confirm the supposition that mechanism responsible for these observed phenomena involves increased lactate in oocytes, we cultured oocytes in high lactate medium and observed the same increased granule formation and retarded cytoplasmic streaming as found by Txnip RNAi. The MI-arrested oocytes exhibited scattered microtubules and aggregated chromosomes indicating that actin networking was disturbed by Txnip RNAi. Therefore, we conclude that Txnip is a critical regulator of glucose metabolism in oocytes and is involved in maintaining cytoplasmic streaming in mouse oocytes.
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Affiliation(s)
- Su-Yeon Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Hyun-Seo Lee
- DNA Repair Research Center, Chosun University, Gwangju, Korea
| | - Eun-Young Kim
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Jung-Jae Ko
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Tae Ki Yoon
- Fertility Center, CHA Gangnam Medical Center, CHA University, Seoul, Korea
| | - Woo-Sik Lee
- Fertility Center, CHA Gangnam Medical Center, CHA University, Seoul, Korea
| | - Kyung-Ah Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
- Fertility Center, CHA Gangnam Medical Center, CHA University, Seoul, Korea
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Wu J, Lin H, Liu D, Liu J, Wang N, Mei X, Sun J, Yang G, Zhang X. The protective effect of telmisartan in Type 2 diabetes rat kidneys is related to the downregulation of thioredoxin-interacting protein. J Endocrinol Invest 2013; 36:453-9. [PMID: 23211392 DOI: 10.3275/8764] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND Thioredoxin-interacting protein (Txnip), an inhibitor of thioredoxin (Trx), increases in diabetic nephropathy and promotes oxidative stress. The angiotensin II (Ang II) receptor blocker telmisartan may protect renal function in diabetic models and patients via multiple effects including antioxidation. However, its mechanism has not been fully elucidated, and its relationship to Txnip remains unclear. AIM This study aimed to investigate whether telmisartan ameliorates oxidative stress by regulating Txnip and Trx expression in Type 2 diabetic rat kidneys and explore the possible relationship between renoprotection by telmisartan and Txnip. METHODS Twenty-one rats were equally divided into control (C), streptozotocin-induced diabetic (D), and telmisartan- treated diabetic (T) groups. Txnip and Trx expression in rat kidneys was analyzed by immunohistochemistry, RTPCR, and western blot. Peroxisome proliferator-activated receptor- γ (PPARγ), NADPH oxidase activity, and parameters of renal function and oxidative stress were also measured. RESULTS Trx and PPARγ were significantly decreased, and Txnip expression and NADPH oxidase activity markedly increased, in the D and T groups compared to the C group. After telmisartan treatment, Trx and PPARγ were upregulated, while Txnip expression and NADPH oxidase activity were downregulated. Parameters of renal function and oxidative stress were improved by telmisartan. CONCLUSION Telmisartan ameliorates oxidative stress and protects renal function in Type 2 diabetic rat kidneys. The downregulation of Txnip by telmisartan may be associated with PPARγ activation.
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Affiliation(s)
- J Wu
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital of Chongqing Medical University, 76 Linjiang Road, Yuzhong District, Chongqing 400010, China
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25
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Abstract
Whereas the role of mammalian thioredoxin (Trx) as an intracellular protein cofactor is widely appreciated, its function in the extracellular environment is not well-understood. Only few extracellular targets of Trx-mediated thiol-disulfide exchange are known. For example, Trx activates extracellular transglutaminase 2 (TG2) via reduction of an intramolecular disulfide bond. Because hyperactive TG2 is thought to play a role in various diseases, understanding the biological role of extracellular Trx may provide critical insight into the pathogenesis of these disorders. Starting from a clinical-stage asymmetric disulfide lead, we have identified analogs with >100-fold specificity for Trx. Structure-activity relationship and computational docking model analyses have provided insights into the features important for enhancing potency and specificity. The most active compound identified had an IC(50) below 0.1 μM in cell culture and may be appropriate for in vivo use to interrogate the role of extracellular Trx in health and disease.
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Affiliation(s)
| | | | - Xi Jin
- Department of Chemistry, Stanford University, Stanford CA 94305
| | - Chaitan Khosla
- Department of Chemical Engineering, Stanford University, Stanford CA 94305
- Department of Chemistry, Stanford University, Stanford CA 94305
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Baker AF, Adab KN, Raghunand N, Chow H, Stratton SP, Squire SW, Boice M, Pestano LA, Kirkpatrick DL, Dragovich T. A phase IB trial of 24-hour intravenous PX-12, a thioredoxin-1 inhibitor, in patients with advanced gastrointestinal cancers. Invest New Drugs 2012; 31:631-641. [PMID: 22711542 DOI: 10.1007/s10637-012-9846-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 05/31/2012] [Indexed: 11/25/2022]
Abstract
We investigated the safety, pharmacokinetics, and pharmacodynamics of PX-12, a thioredoxin-1 (Trx-1) inhibitor, administered as a 24-hour infusion every 7 or 14 days in patients with gastrointestinal malignancies. PX-12 is the first Trx-1 inhibitor to undergo clinical development. The first Phase 1 study of PX-12 demonstrated promising clinical activity, but the 1 and 3 hour-infusion schedules investigated were associated with a strong and irritating odor due to exhalation of one of its metabolites, 2-butanethiol. In an effort to achieve tolerability and achieve a drug exposure level necessary for biological activity, the current study was undertaken. While the maximally tolerated dose was estimated to be 300 mg/m(2) /24 h once a week as the 2-butanethiol expirate was tolerable at that dose level, no evidence of clinical activity was observed. Pharmacokinetic studies of the parent compound PX-12 demonstrated rapid, irreversible binding to plasma components, resulting in low (ng/ml) peak plasma concentrations of non-bound PX-12 during infusion. DCE-MRI was performed pre-and post-infusion in three patients. There were no significant trends observed in changes in plasma Trx-1, vascular endothelial growth factor (VEGF), or beta fibroblast growth factor (FGF-2) pre- or post-treatment. However, there was a trend for a decrease in circulating Trx-1 during the first four PX-12 treatment cycles in patients that had a Trx-1 baseline level >18 ng/mL. Aggregate clinical trial results suggest that further clinical development of PX-12, as an intravenous infusion, is not feasible. However, the Trx-1 pathway remains a target of interest in patients with gastrointestinal malignancies.
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Shimada K, Murayama T, Yokode M, Kita T, Fujita M, Kishimoto C. Olmesartan, a novel angiotensin II type 1 receptor antagonist, reduces severity of atherosclerosis in apolipoprotein E deficient mice associated with reducing superoxide production. Nutr Metab Cardiovasc Dis 2011; 21:672-678. [PMID: 20399087 DOI: 10.1016/j.numecd.2009.12.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Revised: 12/10/2009] [Accepted: 12/31/2009] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND AIM Oxidative stress may play an important role in the development of atherosclerosis. Some angiotensin II type 1 (AT(1)) receptor antagonists have the capacity of reducing oxidative stress in addition to the hemodynamic actions. Accordingly, we assessed the hypothesis that olmesartan, a novel AT(1) receptor antagonist, reduced the severity of atherosclerosis in apolipoprotein (apo) E-deficient mice associated with reducing oxidative stress. METHODS AND RESULTS Atherosclerosis was induced in apo E-deficient mice fed a high fat diet. Mice were intraperitoneally treated with an injection of olmesartan (1mg/kg/day) daily over 8 weeks, and were compared with the untreated controls. Blood pressure was not changed significantly by the olmesartan treatment. Fatty streak plaque developed in apo E-deficient mice, and was suppressed in mice that received olmesartan. In addition, olmesartan reduced not only superoxide production but the overload of oxidative stress in aortic walls. There were no significant differences in serum lipid levels between olmesartan-treated and -untreated groups. In vitro study showed that both olmesartan and its active metabolite RNH-6270, an enantiomer of olmesartan, suppressed interferon-γ, macrophage inflammatory protein-2, and thioredoxin (a marker of oxidative stress) concentrations in cultured cells. CONCLUSION Olmesartan may suppress atherosclerosis via reducing not only superoxide production but also the overload of oxidative stress in this animal model.
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Affiliation(s)
- K Shimada
- Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, 54 Kawara-cho, Shogoin, Sakyo-ku, Kyoto, Japan
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28
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Zhang X, Zheng Y, Fried LE, Du Y, Montano SJ, Sohn A, Lefkove B, Holmgren L, Arbiser JL, Holmgren A, Lu J. Disruption of the mitochondrial thioredoxin system as a cell death mechanism of cationic triphenylmethanes. Free Radic Biol Med 2011; 50:811-20. [PMID: 21215310 PMCID: PMC3047390 DOI: 10.1016/j.freeradbiomed.2010.12.036] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 12/23/2010] [Accepted: 12/27/2010] [Indexed: 11/30/2022]
Abstract
Alterations in mitochondrial structure and function are a hallmark of cancer cells compared to normal cells and thus targeting mitochondria has emerged as an novel approach to cancer therapy. The mitochondrial thioredoxin 2 (Trx2) system is critical for cell viability, but its role in cancer biology is not well understood. Recently some cationic triphenylmethanes such as brilliant green (BG) and gentian violet were shown to have antitumor and antiangiogenic activity with unknown mechanisms. Here we demonstrate that BG killed cells at nanomolar concentrations and targeted mitochondrial Trx2, which was oxidized and degraded. HeLa cells were more sensitive to BG than fibroblasts. In HeLa cells, Trx2 down-regulation by siRNA resulted in increased sensitivity to BG, whereas for fibroblasts, the same treatments had no effect. BG was observed to accumulate in mitochondria and cause a rapid and dramatic decrease in mitochondrial Trx2 protein. With a redox Western blot method, we found that treatment with BG caused oxidation of both Trx1 and Trx2, followed by release of cytochrome c and apoptosis-inducing factor from the mitochondria into the cytosol. Moreover, this treatment resulted in an elevation of the mRNA level of Lon protease, a protein quality control enzyme in the mitochondrial matrix, suggesting that the oxidized Trx2 may be degraded by Lon protease.
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Affiliation(s)
- Xu Zhang
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
| | - Yujuan Zheng
- Department of Oncology and Pathology, Cancer Centrum Karolinska, Karolinska Institute, Stockholm, Sweden
| | - Levi E Fried
- Department of Dermatology, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Yatao Du
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
| | - Sergio J. Montano
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
| | - Allie Sohn
- Department of Dermatology, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Benjamin Lefkove
- Department of Dermatology, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Lars Holmgren
- Department of Oncology and Pathology, Cancer Centrum Karolinska, Karolinska Institute, Stockholm, Sweden
| | - Jack L. Arbiser
- Department of Dermatology, Emory University School of Medicine, Atlanta, Georgia, USA
- Atlanta VA Medical Center, Atlanta, Georgia, USA
| | - Arne Holmgren
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
- Correspondence to: Arne Holmgren, MD, PhD Professor of Biochemistry Division of Biochemistry Department of Medical Biochemistry and Biophysics Karolinska Institutet, SE 171 77 Stockholm, Sweden. Phone: +46 8 52487686; Fax: +46 8 7284716
| | - Jun Lu
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
- Jun Lu, Ph. D Division of Biochemistry Department of Medical Biochemistry and Biophysics Karolinska Institute SE-171 77 Stockholm, Sweden Phone: +46 8 52487005 Fax: +46 8 305193
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Taguchi N, Uemura N, Goto Y, Sakura M, Hara K, Niwa M, Iida M, Yanagishita T, Watanabe D, Kato M. Antioxidative effects of cherry leaves extract on tert-butyl hydroperoxide-mediated cytotoxicity through regulation of thioredoxin-2 protein expression levels. J Toxicol Environ Health A 2011; 74:1240-1247. [PMID: 21797775 DOI: 10.1080/15287394.2011.570229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Components of cherry trees have been used as traditional herbal remedies for various diseases. These components are known to possess antioxidative effects. However, the mechanisms underlying cherry tree component-mediated antioxidative effects remain largely unknown. This study focused on cherry leaves extract (CLE) and examined the mechanism underlying the effect of CLE on tert-butyl hydroperoxide (t-BOOH)-induced melanocytic cell death with DNA damage. Interestingly, CLE prevented t-BOOH-induced cell death with reduction in DNA damage, p38 kinase activation, and reactive oxygen species (ROS) production. CLE-mediated suppression of cell death with reduction of DNA damage, p38 kinase activity and ROS production was prevented by a thioredoxin (Trx) system inhibitor but not by a glutathione (GSH) system inhibitor. Finally, data showed that CLE prevented t-BOOH-induced reduction of Trx2 but not Trx1 and Trx reductases (TrxR1 and TrxR2) protein expression. Thus, our results suggest that CLE prevents t-BOOH-induced reduction in Trx2 expression, promotion of ROS production, activation of p38 kinase, and increase in DNA damage and that it protects against cell death.
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Affiliation(s)
- Nobuhiko Taguchi
- Units of Environmental Health Sciences, Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Kasugai-shi, Aichi, Japan
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Wang XL, Lau WB, Yuan YX, Wang YJ, Yi W, Christopher TA, Lopez BL, Liu HR, Ma XL. Methylglyoxal increases cardiomyocyte ischemia-reperfusion injury via glycative inhibition of thioredoxin activity. Am J Physiol Endocrinol Metab 2010; 299:E207-14. [PMID: 20460580 PMCID: PMC2928516 DOI: 10.1152/ajpendo.00215.2010] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Diabetes mellitus (DM) is closely related to cardiovascular morbidity and mortality, but the specific molecular basis linking DM with increased vulnerability to cardiovascular injury remains incompletely understood. Methylglyoxal (MG), a precursor to advanced glycation end products (AGEs), is increased in diabetic patient plasma, but its role in diabetic cardiovascular complications is unclear. Thioredoxin (Trx), a cytoprotective molecule with antiapoptotic function, has been demonstrated to be vulnerable to glycative inhibition, but whether Trx is glycatively inhibited by MG, thus contributing to increased cardiac injury, has never been investigated. Cultured H9c2 cardiomyocytes were treated with MG (200 muM) for 6 days. The following were determined pre- and post-simulated ischemia-reperfusion (SI-R; 8 h of hypoxia followed by 3 h of reoxygenation): cardiomyocyte death/apoptosis, Trx expression and activity, AGE formation, Trx-apoptosis-regulating kinase-1 (Trx-ASK1) complex formation, and p38 mitogen-activated protein kinase (MAPK) phosphorylation and activity. Compared with vehicle, MG significantly increased SI-R-induced cardiomyocyte LDH release and apoptosis (P < 0.01). Prior to SI-R, Trx activity was reduced in MG-treated cells, but Trx expression was increased moderately. Moreover, Trx-ASK1 complex formation was reduced, and both p38 MAPK activity and phosphorylation were increased. To investigate the effects of MG on Trx directly, recombinant human Trx (hTrx) was incubated with MG in vitro. Compared with vehicle, MG incubation markedly increased CML formation (a glycation footprint) and inhibited Trx activity. Finally, glycation inhibitor aminoguanidine administration during MG treatment of cultured cells reduced AGE formation, increased Trx activity, restored Trx-ASK1 interaction, and reduced p38 MAPK phosphorylation and activity, caspase-3 activation, and LDH release (P < 0.01). We demonstrated for the first time that methylglyoxal sensitized cultured cardiomyocytes to SI-R injury by posttranslational modification of Trx via glycation. Therapeutic interventions scavenging AGE precursors may attenuate ischemic-reperfusion injury in hyperglycemic state diseases such as diabetes.
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Affiliation(s)
- Xiao-Liang Wang
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA
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Abstract
Angiogenesis has become an attractive target for drug therapy because of its key role in tumor growth. An extensive array of compounds is currently in preclinical development, with many now entering the clinic and/or achieving approval from the US Food and Drug Administration. Several regulatory and signaling molecules governing angiogenesis are of interest, including growth factors (eg, vascular endothelial growth factor, platelet-derived growth factor, fibroblast growth factor, and epidermal growth factor), receptor tyrosine kinases, and transcription factors such as hypoxia inducible factor, as well as molecules involved in mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K) signaling. Pharmacologic agents have been identified that target these pathways, yet for some agents (notably thalidomide), an understanding of the specific mechanisms of antitumor action has proved elusive. The following review describes key molecular mechanisms and novel therapies that are on the horizon for antiangiogenic tumor therapy.
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Affiliation(s)
| | - William D. Figg
- To whom correspondence should be addressed: 10 Center Drive, 9000 Rockville Pike, Building 10, Room 5A01, Bethesda, MD 20892 USA Phone: 301-402-3622 Fax: 301-402-8606
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Alberti A, Karamessinis P, Peroulis M, Kypreou K, Kavvadas P, Pagakis S, Politis PK, Charonis A. ERp46 is reduced by high glucose and regulates insulin content in pancreatic beta-cells. Am J Physiol Endocrinol Metab 2009; 297:E812-21. [PMID: 19622788 DOI: 10.1152/ajpendo.00053.2009] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Our studies focus on ERp46, an endoplasmic reticulum (ER) component, and analyze its involvement in glucose toxicity and in insulin production. Differences in pancreatic beta-TC-6 cell proteome under conditions of low vs. high glucose were examined by proteomic approaches, including two-dimensional gel electrophoresis, image analysis, and mass spectrometry. Among differentially expressed proteins, ERp46, a novel endoplasmic reticulum component, was examined further. The expression of ERp46 in pancreatic sections was analyzed by immunocytochemistry, and high glucose-induced alterations of expression were evaluated in cultured beta-cells, in isolated pancreatic islets, and in the pancreas of db/db diabetic animals. Inhibition of ERp46 expression by siRNA was performed to study its role in insulin production, in secretion, and in ER stress. Proteomic analysis led to identification of 46 differentially expressed spots corresponding to 23 proteins. Since ERp46 is a novel protein with a possible crucial role in secretory cells, we further analyzed its role in beta-cell function. ERp46 expression is reduced in high glucose concentration in beta-TC-6 cells and in isolated murine islets. Further analysis revealed high expression of ERp46 in pancreatic islets compared with exocrine tissue. Interestingly, a marked decrease in ERp46 expression was found in the pancreatic islets of db/db mice. Most importantly, siRNA-mediated knockdown of ERp46 in cultured beta-cells led to a significant decrease in the insulin content; however, no alterations in insulin mRNA levels were observed under these conditions. In addition, reduced expression of ERp46 by siRNA increased the expression of CHOP and peIF2a, indicating development of ER stress. We conclude that ERp46 may be an important component in the phenomenon of "glucose toxicity" involved in insulin production at the posttranslational level.
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Affiliation(s)
- Avra Alberti
- Division of Histology, Center for Basic Research, Biomedical Research Foundation of the Academy of Athens, 4, Soranou Efessiou St., Athens 115 27, Greece
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Shaked M, Ketzinel-Gilad M, Ariav Y, Cerasi E, Kaiser N, Leibowitz G. Insulin counteracts glucotoxic effects by suppressing thioredoxin-interacting protein production in INS-1E beta cells and in Psammomys obesus pancreatic islets. Diabetologia 2009; 52:636-44. [PMID: 19214472 DOI: 10.1007/s00125-009-1274-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Accepted: 01/12/2009] [Indexed: 02/07/2023]
Abstract
AIMS/HYPOTHESIS In type 2 diabetes, glucose toxicity leads to beta cell apoptosis with decreased beta cell mass as a consequence. Thioredoxin-interacting protein (TXNIP) is a critical mediator of glucose-induced beta cell apoptosis. Since hyperglycaemia leads to elevated serum insulin, we hypothesised that insulin is involved in the regulation of TXNIP protein levels in beta cells. METHODS We studied the production of TXNIP in INS-1E beta cells and in islets of Psammomys obesus, an animal model of type 2 diabetes, in response to glucose and different modulators of insulin secretion. RESULTS TXNIP production was markedly augmented in islets from diabetic P. obesus and in beta cells exposed to high glucose concentration. In contrast, adding insulin to the culture medium or stimulating insulin secretion with different secretagogues suppressed TXNIP. Inhibition of glucose and fatty acid-stimulated insulin secretion with diazoxide increased TXNIP production in beta cells. Nitric oxide (NO), a repressor of TXNIP, enhanced insulin signal transduction, whereas inhibition of NO synthase abolished its activation, suggesting that TXNIP inhibition by NO is mediated by stimulation of insulin signalling. Treatment of beta cells chronically exposed to high glucose with insulin reduced beta cell apoptosis. Txnip knockdown mimicking the effect of insulin prevented glucose-induced beta cell apoptosis. CONCLUSIONS/INTERPRETATION Insulin is a potent repressor of TXNIP, operating a negative feedback loop that restrains the stimulation of TXNIP by chronic hyperglycaemia. Repression of TXNIP by insulin is probably an important compensatory mechanism protecting beta cells from oxidative damage and apoptosis in type 2 diabetes.
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Affiliation(s)
- M Shaked
- Endocrinology and Metabolism Service, Department of Medicine, Hadassah, Hebrew University Medical Center, P.O. Box 12000, Jerusalem, 91120, Israel
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Scholle MD, Banach BS, Hamdan SM, Richardson CC, Kay BK. Peptide ligands specific to the oxidized form of Escherichia coli thioredoxin. Biochim Biophys Acta 2008; 1784:1735-1741. [PMID: 18672101 PMCID: PMC4742250 DOI: 10.1016/j.bbapap.2008.06.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2008] [Revised: 06/24/2008] [Accepted: 06/25/2008] [Indexed: 05/26/2023]
Abstract
Thioredoxin (Trx) is a highly conserved redox protein involved in several essential cellular processes. In this study, our goal was to isolate peptide ligands to Escherichia coli Trx that mimic protein-protein interactions, specifically the T7 polymerase-Trx interaction. To do this, we subjected Trx to affinity selection against a panel of linear and cysteine-constrained peptides using M13 phage display. A novel cyclized conserved peptide sequence, with a motif of C(D/N/S/T/G)D(S/T)-hydrophobic-C-X-hydrophobic-P, was isolated to Trx. These peptides bound specifically to the E. coli Trx when compared to the human and spirulina homologs. An alanine substitution of the active site cysteines (CGPC) resulted in a significant loss of peptide binding affinity to the Cys-32 mutant. The peptides were also characterized in the context of Trx's role as a processivity factor of the T7 DNA polymerase (gp5). As the interaction between gp5 and Trx normally takes place under reducing conditions, which might interfere with the conformation of the disulfide-bridged peptides, we made use of a 22 residue deletion mutant of gp5 in the thioredoxin binding domain (gp5Delta22) that bypassed the requirements of reducing conditions to interact with Trx. A competition study revealed that the peptide selectively inhibits the interaction of gp5Delta22 with Trx, under oxidizing conditions, with an IC50 of approximately 10 microM.
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Affiliation(s)
| | - Bridget S. Banach
- Department of Microbiology and Immunology, Loyola University Chicago, Stritch School of Medicine, Maywood, IL, 60153
| | - Samir M. Hamdan
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, 02115
| | - Charles C. Richardson
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, 02115
| | - Brian K. Kay
- Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL 60607
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Nigro P, Dal Piaz F, Gallotta D, De Tommasi N, Belisario MA. Inhibition of the thioredoxin system is a basis for the antileukemic potential of 13-hydroxy-15-oxo-zoapatlin. Free Radic Biol Med 2008; 45:875-84. [PMID: 18638547 DOI: 10.1016/j.freeradbiomed.2008.06.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2008] [Revised: 05/28/2008] [Accepted: 06/13/2008] [Indexed: 01/24/2023]
Abstract
The mammalian thioredoxin (Trx) system, composed of Trx, Trx reductase (TrxR), and NADPH, is the most important thiol system involved in the redox control of signaling and regulatory proteins in apoptosis and cell proliferation. Here we addressed the inhibition of the Trx system by 13-hydroxy-15-oxo-zoapatlin (OZ), a nor-kaurane diterpene previously shown to possess proapoptotic potential and to cause cell cycle arrest in leukemia cells. OZ was found, by both biochemical and mass spectrometry-based approaches, to target Trx1 and TrxR in a cell-free system. In particular, the formation of reversible OZ adducts to Trx1 Cys35, Cys62, and Cys73 was demonstrated. We next showed that OZ efficiently inhibited Trx and TrxR catalytic activity in Molt4 cells. The occurrence of oxidative modifications of Trx molecules was assessed by "redox Western blot" analyses. OZ-mediated Trx oxidation resulted in apoptosis signaling kinase-1 release and activation of downstream JNK and p38 pathways. By means of specific inhibitors of these two stress-activated protein kinases, we demonstrated that the JNK pathway plays a major role in determining the apoptotic fate of OZ-exposed cells, whereas p38 activation seems to be involved mainly in OZ-induced G2/M block.
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Affiliation(s)
- Patrizia Nigro
- Dipartimento di Scienze Farmaceutiche, Università di Salerno, Via Ponte Don Melillo, 84084 Fisciano, Salerno, Italy
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Das S, Khan N, Mukherjee S, Bagchi D, Gurusamy N, Swartz H, Das DK. Redox regulation of resveratrol-mediated switching of death signal into survival signal. Free Radic Biol Med 2008; 44:82-90. [PMID: 18045550 DOI: 10.1016/j.freeradbiomed.2007.09.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2007] [Revised: 08/10/2007] [Accepted: 09/11/2007] [Indexed: 11/23/2022]
Abstract
In this study, we determined the changes in the intracellular redox environment of the heart during ischemia and reperfusion and the effects of resveratrol on such changes. Because redox regulation by thioredoxin (Trx) plays a crucial role in signal transduction and cytoprotection against ROS, the effects of resveratrol on the changes in the amounts of thioredoxin were monitored in an attempt to determine the role of intracellular thioredoxin in resveratrol-mediated changes in intracellular redox environment and its role in resveratrol-mediated cardioprotection. Rats were randomly divided into four groups: group I, control (rats were gavaged with vehicle only); group II, rats were gavaged with 2.5 mg/kg body wt resveratrol per day for 10 days; group III, rats were given resveratrol for 10 days, but on the 7th day, they were treated with shRNA against Trx-1; group IV, rats were given resveratrol for 10 days, but were injected (iv) with cisplatin (1 mg/kg body wt) on days 1, 3, 5, 7, and 9. In concert, two groups of mice (Dn-Trx-1) and a corresponding wild-type group were also gavaged with 2.5 mg/kg body wt resveratrol for 10 days. After 10 days, isolated rat and mouse hearts perfused via working mode were made globally ischemic for 30 min followed by 2 h of reperfusion. Ischemia/reperfusion developed an infarct size of about 40% and resulted in about 25% apoptotic cardiomyocytes, which were reduced by resveratrol. Cisplatin, but not shRNA-Trx-1, abolished the cardioprotective abilities of resveratrol. In the experiments with mouse hearts, similar to rat hearts, resveratrol significantly reduced the ischemia/reperfusion-mediated increase in infarct size and apoptosis in both groups. MDA formation, a presumptive marker for lipid peroxidation, was increased in the I/R group and reduced in the resveratrol group, and resveratrol-mediated reduction in MDA formation was abolished with cisplatin, but not with shRNA-Trx-1. I/R-induced reduction in GSH/GSSH ratio was prevented by resveratrol, and resveratrol-mediated preservation of GSH/GSSG ratio was reduced by cisplatin, but not by sh-RNA-Trx-1. RT-PCR revealed an increase in both Trx-1 and Trx-2 transcripts; but only Trx-2 protein, not Trx-1 protein, was enhanced with resveratrol by Western blot analysis. Electron paramagnetic resonance spectroscopic study revealed that resveratrol treatment significantly increased the decay rates of nitroxide radicals compared to control hearts, suggesting that resveratrol can switch into the reduction state more compared to control heart. Finally, resveratrol generated a survival signal by phosphorylation of Akt and increase in induction of Bcl-2 expression, which was inhibited by cisplatin, but not by shRNA-Trx-1. Taken together, the results of this study indicate that resveratrol provides cardioprotection by maintaining intracellular redox environments, and Trx-2 is likely to play a role in switching I/R-induced death signal into survival signal.
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Affiliation(s)
- Samarjit Das
- Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, CT 06030, USA
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Abstract
Despite recent advances in understanding molecular mechanisms involved in glioblastoma progression, the prognosis of the most malignant brain tumor continues to be dismal. Because the flavonoid kaempferol is known to suppress growth of a number of human malignancies, we investigated the effect of kaempferol on human glioblastoma cells. Kaempferol induced apoptosis in glioma cells by elevating intracellular oxidative stress. Heightened oxidative stress was characterized by an increased generation of reactive oxygen species (ROS) accompanied by a decrease in oxidant-scavenging agents such as superoxide dismutase (SOD-1) and thioredoxin (TRX-1). Knockdown of SOD-1 and TRX-1 expression by small interfering RNA (siRNA) increased ROS generation and sensitivity of glioma cells to kaempferol-induced apoptosis. Signs of apoptosis included decreased expression of Bcl-2 and altered mitochondrial membrane potential with elevated active caspase-3 and cleaved poly(ADP-ribose) polymerase expression. Plasma membrane potential and membrane fluidity were altered in kaempferol-treated cells. Kaempferol suppressed the expression of proinflammatory cytokine interleukin-6 and chemokines interleukin-8, monocyte chemoattractant protein-1, and regulated on activation, normal T-cell expressed and secreted. Kaempferol inhibited glioma cell migration in a ROS-dependent manner. Importantly, kaempferol potentiated the toxic effect of chemotherapeutic agent doxorubicin by amplifying ROS toxicity and decreasing the efflux of doxorubicin. Because the toxic effect of both kaempferol and doxorubicin was amplified when used in combination, this study raises the possibility of combinatorial therapy whose basis constitutes enhancing redox perturbation as a strategy to kill glioma cells.
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Affiliation(s)
- Vivek Sharma
- National Brain Research Centre, near NSG Campus, Manesar, Gurgaon, Haryana-122050, India
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Kondo N, Ishii Y, Kwon YW, Tanito M, Sakakura-Nishiyama J, Mochizuki M, Maeda M, Suzuki S, Kojima M, Kim YC, Son A, Nakamura H, Yodoi J. Lipid raft-mediated uptake of cysteine-modified thioredoxin-1: apoptosis enhancement by inhibiting the endogenous thioredoxin-1. Antioxid Redox Signal 2007; 9:1439-48. [PMID: 17627472 DOI: 10.1089/ars.2007.1665] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Thioredoxin-1 (TRX) plays important roles in cellular signaling by controlling the redox state of cysteine residues in target proteins. TRX is released in response to oxidative stress and shows various biologic functions from the extracellular environment. However, the mechanism by which extracellular TRX transduces the signal into the cells remains unclear. Here we report that the cysteine modification at the active site of TRX promotes the internalization of TRX into the cells. TRX-C35S, in which the cysteine at residue 35 of the active site was replaced with serine, was internalized more effectively than wild-type TRX in human T-cell leukemia virus-transformed T cells. TRX-C35S bound rapidly to the cell surface and was internalized into the cells dependent on lipid rafts in the plasma membrane. This process was inhibited by wild-type TRX, reducing reagents such as dithiothreitol, and methyl-beta-cyclodextrin, which disrupts lipid rafts. Moreover, the internalized TRX-C35S binds to endogenous TRX, resulting in the generation of intracellular reactive oxygen species (ROS) and enhanced cis-diamine-dichloroplatinum (II) (CDDP)-induced apoptosis via a ROS-mediated pathway involving apoptosis signal-regulating kinase-1 (ASK-1) activation. These findings suggest that the cysteine at the active site of TRX plays a key role in the internalization and signal transduction of extracellular TRX into the cells.
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Affiliation(s)
- Norihiko Kondo
- Department of Biological Responses, Institute for Virus Research, Kyoto University, and Thioredoxin Project, Translational Research Center Kyoto University Hospital, Kyoto, Japan.
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Matsuura T, Harrison RA, Westwell AD, Nakamura H, Martynyuk AE, Sumners C. Basal and angiotensin II-inhibited neuronal delayed-rectifier K+ current are regulated by thioredoxin. Am J Physiol Cell Physiol 2007; 293:C211-7. [PMID: 17360810 DOI: 10.1152/ajpcell.00615.2006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In previous studies, we determined that macrophage migration inhibitory factor (MIF), acting intracellularly via its intrinsic thiol-protein oxidoreductase (TPOR) activity, stimulates basal neuronal delayed-rectifier K+ current ( IKv) and inhibits basal and angiotensin (ANG) II-induced increases in neuronal activity. These findings are the basis for our hypothesis that MIF is a negative regulator of ANG II actions in neurons. MIF has recently been recategorized as a member of the thioredoxin (Trx) superfamily of small proteins. In the present study we have examined whether Trx influences basal and ANG II-modulated IKv in an effort to determine whether the Trx superfamily can exert a general regulatory influence over neuronal activity and the actions of ANG II. Intracellular application of Trx (0.8–80 nM) into rat hypothalamic/brain stem neurons in culture increased neuronal IKv, as measured by voltage-clamp recordings. This effect of Trx was abolished in the presence of the TPOR inhibitor PMX 464 (800 nM). Furthermore, the mutant protein recombinant human C32S/C35S-Trx, which lacks TPOR activity, failed to alter neuronal IKv. Trx applied at a concentration (0.08 nM) that does not alter basal IKv abolished the inhibition of neuronal IKv produced by ANG II (100 nM). Given our observation that ANG II increases Trx levels in neuronal cultures, it is possible that Trx (like MIF) has a negative regulatory role over basal and ANG II-stimulated neuronal activity via modulation of IKv. Moreover, these data suggest that TPOR may be a general mechanism for negatively regulating neuronal activity.
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Affiliation(s)
- Tomokazu Matsuura
- Dept. of Physiology and Functional Genomics, College of Medicine, University of Florida, Box 100274, 1600 SW Archer Rd., Gainesville, FL 32610-0274, USA
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Zhang H, Tao L, Jiao X, Gao E, Lopez BL, Christopher TA, Koch W, Ma XL. Nitrative thioredoxin inactivation as a cause of enhanced myocardial ischemia/reperfusion injury in the aging heart. Free Radic Biol Med 2007; 43:39-47. [PMID: 17561092 PMCID: PMC1949486 DOI: 10.1016/j.freeradbiomed.2007.03.016] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 02/20/2007] [Accepted: 03/07/2007] [Indexed: 10/23/2022]
Abstract
Several recent studies have demonstrated that thioredoxin (Trx) is an important antiapoptotic/cytoprotective molecule. The present study was designed to determine whether Trx activity is altered in the aging heart in a way that may contribute to increased susceptibility to myocardial ischemia/reperfusion (MI/R). Compared to young animals, MI/R-induced cardiomyocyte apoptosis and infarct size were increased in aging animals (p<0.01). Trx activity was decreased in the aging heart before MI/R, and this difference was further amplified after MI/R. Trx expression was moderately increased and Trx nitration, a posttranslational modification that inhibits Trx activity, was increased in the aging heart. Moreover, Trx-aptosis-regulating kinase-1 (Trx-ASK1) complex formation was reduced and activity of p38 mitogen-activated protein kinase (MAPK) was increased. Treatment with FP15 (a peroxynitrite decomposition catalyst) reduced Trx nitration, increased Trx activity, restored Trx-ASK1 interaction, reduced P38 MAPK activity, attenuated caspase 3 activation, and reduced infarct size in aging animals (p<0.01). Our results demonstrated that Trx activity is decreased in the aging heart by posttranslational nitrative modification. Interventions that restore Trx activity in the aging heart may be novel therapies to attenuate MI/R injury in aging patients.
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Affiliation(s)
- Hangxiang Zhang
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | - Ling Tao
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | - Xiangying Jiao
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | - Erhe Gao
- Center for Translational Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | - Bernard L. Lopez
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | | | - Walter Koch
- Center for Translational Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | - Xin L. Ma
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107
- Address proofs to: * Xin L Ma, M.D., Ph.D., Department of Emergency Medicine, 1020 Sansom Street, Thompson Building, Room 239, Philadelphia, PA 19107, Tel: (215)955-4994, Fax: (215)503-4458, E-mail:
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Ramanathan RK, Kirkpatrick DL, Belani CP, Friedland D, Green SB, Chow HHS, Cordova CA, Stratton SP, Sharlow ER, Baker A, Dragovich T. A Phase I pharmacokinetic and pharmacodynamic study of PX-12, a novel inhibitor of thioredoxin-1, in patients with advanced solid tumors. Clin Cancer Res 2007; 13:2109-14. [PMID: 17404093 DOI: 10.1158/1078-0432.ccr-06-2250] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Thioredoxin-1 (Trx-1) is a cellular redox protein that promotes tumor growth, inhibits apoptosis, and up-regulates hypoxia-inducible factor-1alpha and vascular endothelial growth factor. Objectives of this study were to determine safety, tolerability, pharmacodynamics, and pharmacokinetics of PX-12, a small-molecule inhibitor of Trx-1. EXPERIMENTAL DESIGN Thirty-eight patients with advanced solid tumors received PX-12 at doses of 9 to 300 mg/m(2), as a 1- or 3-h i.v. infusion on days 1 to 5, repeated every 3 weeks. RESULTS At the 300 mg/m(2) dose level, one patient experienced a reversible episode of pneumonitis during the first cycle, and a second patient developed pneumonitis after the second cycle. Doses up to 226 mg/m(2) were well tolerated, and grade 3/4 events were uncommon (<3% of patients). The limiting factor on this dosing schedule was pungent odor caused by expired drug metabolite, 2-butanethiol. The best response was stable disease in seven patients (126-332 days). Whereas PX-12 was not detectable following the infusion, the C(max) of its inactive metabolite, 2-mercaptoimidazole, increased linearly with dose. PX-12 treatment lowered plasma Trx-1 concentrations in a dose-dependent manner. CONCLUSIONS PX-12, the first Trx-1 inhibitor to enter clinical trials, was tolerated up to a dose of 226 mg/m(2) by a 3-h infusion. Based on pharmacodynamic and pharmacokinetic data, a trial of prolonged infusion schedule of PX-12 has been initiated.
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Affiliation(s)
- Ramesh K Ramanathan
- Division of Hematology/Oncology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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Mukherjee A, Huber K, Evans H, Lakhani N, Martin S. A cellular and molecular investigation of the action of PMX464, a putative thioredoxin inhibitor, in normal and colorectal cancer cell lines. Br J Pharmacol 2007; 151:1167-75. [PMID: 17572693 PMCID: PMC2189840 DOI: 10.1038/sj.bjp.0707342] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND AND PURPOSE PMX464 is a novel benzothiazole substituted cyclohexadienone reportedly targeting the thioredoxin (Trx1)/thioredoxin reductase (TrxR1) system. We have previously shown that PMX464 has enhanced hypoxic anti-proliferative effects in colorectal tumour cells, with some non-tumour cells (quiescent endothelium and fibroblasts) being relatively resistant. The current study aimed to validate the Trx1 system as a molecular target of PMX464 in tumour cells and to investigate the differential sensitivities of normal cells at the molecular level. EXPERIMENTAL APPROACH Proliferation, clonogenic survival, protein expression and function, cell cycle and apoptosis assays were conducted using colorectal tumour (HT29), endothelial (HUVEC) and fibroblast (MRCV) cells treated with PMX464 under normoxic and hypoxic (1% O(2)) conditions. KEY RESULTS Protein and enzyme assays showed that PMX464, in HT29, inhibited Trx1 function without altering expression and that inhibition correlated with decreased proliferation and survival, and was more marked under hypoxia. In contrast, although hypoxic HUVEC were sensitive, in terms of proliferation and survival, inhibition of Trx1 function was not observed. Quiescent HUVEC and MRCVs (that have undetectable Trx1 protein) were relatively resistant. The effect on HT29 cells was essentially due to cell cycle inhibition, as apoptosis was modest. Anti-proliferative effects were lost after a lag period, suggesting a reversible phenomenon. CONCLUSIONS AND IMPLICATIONS The Trx1 system is an important target in tumour cells and can be inhibited by PMX464. Quiescent HUVEC and fibroblasts are relatively resistant conferring a therapeutic benefit when targeting Trx1.
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Affiliation(s)
- A Mukherjee
- Division of Clinical Oncology, School of Molecular Medical Sciences, University of Nottingham, Nottingham University Hospitals Nottingham, UK
| | - K Huber
- Division of Clinical Oncology, School of Molecular Medical Sciences, University of Nottingham, Nottingham University Hospitals Nottingham, UK
| | - H Evans
- Division of Clinical Oncology, School of Molecular Medical Sciences, University of Nottingham, Nottingham University Hospitals Nottingham, UK
| | - N Lakhani
- Division of Clinical Oncology, School of Molecular Medical Sciences, University of Nottingham, Nottingham University Hospitals Nottingham, UK
| | - S Martin
- Division of Clinical Oncology, School of Molecular Medical Sciences, University of Nottingham, Nottingham University Hospitals Nottingham, UK
- Author for correspondence:
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Turturro F, Friday E, Welbourne T. Hyperglycemia regulates thioredoxin-ROS activity through induction of thioredoxin-interacting protein (TXNIP) in metastatic breast cancer-derived cells MDA-MB-231. BMC Cancer 2007; 7:96. [PMID: 17555594 PMCID: PMC1906826 DOI: 10.1186/1471-2407-7-96] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Accepted: 06/07/2007] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND We studied the RNA expression of the genes in response to glucose from 5 mM (condition of normoglycemia) to 20 mM (condition of hyperglycemia/diabetes) by microarray analysis in breast cancer derived cell line MDA-MB-231. We identified the thioredoxin-interacting protein (TXNIP), whose RNA level increased as a gene product particularly sensitive to the variation of the level of glucose in culture media. We investigated the kinesis of the TXNIP RNA and protein in response to glucose and the relationship between this protein and the related thioredoxin (TRX) in regulating the level of reactive oxygen species (ROS) in MDA-MB-231 cells. METHODS MDA-MB-231 cells were grown either in 5 or 20 mM glucose chronically prior to plating. For glucose shift (5/20), cells were plated in 5 mM glucose and shifted to 20 mM at time 0. Cells were analyzed with Affymetrix Human U133A microarray chip and gene expression profile was obtained. Semi-quantitative RT-PCR and Western blot was used to validate the expression of TXNIP RNA and protein in response to glucose, respectively. ROS were detected by CM-H2DCFDA (5-6-chloromethyl-2',7'-dichlorodihydrofluorescein diacetate) and measured for mean fluorescence intensity with flow cytometry. TRX activity was assayed by the insulin disulfide reducing assay. RESULTS We found that the regulation of TXNIP gene expression by glucose in MDA-MB-231 cells occurs rapidly within 6 h of its increased level (20 mM glucose) and persists through the duration of the conditions of hyperglycemia. The increased level of TXNIP RNA is followed by increased level of protein that is associated with increasing levels of ROS and reduced TRX activity. The inhibition of the glucose transporter GLUT1 by phloretin notably reduces TXNIP RNA level and the inhibition of the p38 MAP kinase activity by SB203580 reverses the effects of TXNIP on ROS-TRX activity. CONCLUSION In this study we show that TXNIP is an oxidative stress responsive gene and its expression is exquisitely regulated by glucose level in highly metastatic MDA-MB-231 cells.
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Affiliation(s)
- Francesco Turturro
- Department of Medicine, Feist-Weiller Cancer Center, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, Louisiana, 70103, USA
- Gene Therapy Program, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, Louisiana, 70103, USA
| | - Ellen Friday
- Department of Medicine, Feist-Weiller Cancer Center, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, Louisiana, 70103, USA
- Gene Therapy Program, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, Louisiana, 70103, USA
| | - Tomas Welbourne
- Department of Molecular and Cellular Physiology, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, Louisiana, 70103, USA
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Martin S. New Agents in Clinical Oncology. 24 November 2006, London, UK. IDrugs 2007; 10:99-101. [PMID: 17285459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- Stewart Martin
- University of Nottingham, Department of Clinical Oncology, Nottingham University Hospitals NHS Trust, City Hospital Campus, Nottingham, NG7 2RD, UK.
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Guo HX, Yin J, Ren JP, Wang ZY, Chen HL. Changes in proteins within germinating seeds of transgenic wheat with an antisense construct directed against the thioredoxin. Zhi Wu Sheng Li Yu Fen Zi Sheng Wu Xue Xue Bao 2007; 33:18-24. [PMID: 17287565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Thioredoxin h is closely related to germination of cereal seeds. The mechanism of transgenic wheat seeds with antisense trxs gene, which is responsible for low germination rate was studied through analyzing the changes in proteins of wheat seeds during germination. The antisense trxs could weaken the metabolism of wheat seeds by decreasing the quantity of proteins involved in metabolism, while chloroform-methanol (CM) protein fraction consisted mostly of some low molecular weight proteins (<20 kD). Compared with wild-type wheat seeds, the folding of glutenin in transgenic wheat ones was affected during the wheat maturating. Big glutenin macropolymers could be formed more easily in transgenic wheat seeds than in wild-type wheat ones. Therefore, the degradation speed of glutenin in transgenic wheat seeds was slower than that in wild-type wheat ones during seed germination. In addition, the degradation of some proteins in transgenic wheat embryos was also delayed during germination.
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Affiliation(s)
- Hong-Xiang Guo
- National Engineering Research Center for Wheat, College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China
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Galmarini CM. Drug evaluation: the thioredoxin inhibitor PX-12 in the treatment of cancer. Curr Opin Investig Drugs 2006; 7:1108-15. [PMID: 17209529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Biomira Inc, following its acquisition of ProlX Pharmaceutical Corp, is developing PX-12, an inhibitor of thioredoxin, for the potential treatment of cancer. PX-12 has completed phase I clinical trials.
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Affiliation(s)
- Carlos M Galmarini
- Université Claude Bernard Lyon 1, EA3737 Pathologie des Cellules Lymphoides, UFR de Médecin Lyon-Sud, Centre Hospitalier Lyon-Sud, 165 Chemin du Grand Revoyet, 69495 Pierre-Bénite, France.
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Malik G, Gorbounov N, Das S, Gurusamy N, Otani H, Maulik N, Goswami S, Das DK. Ischemic preconditioning triggers nuclear translocation of thioredoxin and its interaction with Ref-1 potentiating a survival signal through the PI-3-kinase-Akt pathway. Antioxid Redox Signal 2006; 8:2101-9. [PMID: 17034353 DOI: 10.1089/ars.2006.8.2101] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Thioredoxin (Trx-1), a key mediator of cellular redox homeostasis and cell survival, is implicated in redox signaling in the ischemic myocardium. To investigate further its mechanism of action, Trx expression in rat heart was suppressed by direct injection of small hairpin RNA against Trx-1 (shRNA-Trx-1). Forty-eight hours after treatment, hearts were excised for isolated working-heart preparation. A group of hearts was preconditioned (PC) by subjecting them to four cyclic episodes of 5-min ischemia, each followed by 10 min of reperfusion. All the hearts, PC or non-PC, were subjected to 30-min ischemia followed by 2 h of reperfusion. As expected, the PC hearts exhibited improved ventricular function, reduced infarct size, and cardiomyocyte apoptosis. Also in PC hearts, an increase was noted in Trx-1 and other cardioprotective and redox-regulated proteins like Ref-1, phospho-Akt, and NF-kappaB DNA-binding activity. PC also caused nuclear translocation of Trx-1 and Ref-1 followed by their association. However, in hearts treated with shRNA-Trx 1, the cardioprotective effects of PC were abolished along with a concomitant decrease in nuclear localized Trx-1 and Ref-1, along with a decrease in phospho-Akt and NF-kappaB. These results demonstrate that PC triggers translocation of Trx-1 into the nucleus, where it becomes associated with Ref-1 and performs redox signaling through the activation of NF-kappaB and an increase in prosurvival signal inducer phospho-Akt.
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Affiliation(s)
- Gautam Malik
- Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, Connecticut and Walter Reed Army Research Institute, Washington, DC, USA
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Jones DT, Pugh CW, Wigfield S, Stevens MFG, Harris AL. Novel Thioredoxin Inhibitors Paradoxically Increase Hypoxia-Inducible Factor-α Expression but Decrease Functional Transcriptional Activity, DNA Binding, and Degradation. Clin Cancer Res 2006; 12:5384-94. [PMID: 17000671 DOI: 10.1158/1078-0432.ccr-05-2380] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Hypoxia-inducible factor-alpha (HIF-alpha) is a transcription factor that regulates the response to hypoxia. HIF-alpha protein is found at high levels in many cancers, and the redox protein thioredoxin-1 (Trx-1) increases both aerobic and hypoxia-induced HIF-alpha. Therefore, Trx-1 and HIF-alpha are attractive molecular targets for novel cancer therapeutics. EXPERIMENTAL DESIGN We investigated whether two novel anticancer drugs AJM290 and AW464 (quinols), which inhibit Trx-1 function, can inhibit the HIF pathway. RESULTS Treatment of several cancer cell lines with AJM290 or AW464 prevented the hypoxia-induced increase of vascular endothelial growth factor (VEGF) at subtoxic concentrations. AJM290 and AW464 also decreased VEGF in pVHL mutant renal cell carcinoma cells that constitutively overexpress HIF-alpha protein. They surprisingly up-regulated HIF-alpha expression in breast cancer cell lines in normoxia and hypoxia as well as in pVHL mutant cells. In the MDA-MB-468 breast cancer cell line, the compounds inhibited RNA and protein expression of the HIF-alpha target genes, carbonic anhydrase IX, VEGF, and BNIP3, concordantly with HIF-alpha up-regulation. Both compounds specifically inhibited HIF-alpha-dependent induction of hypoxia regulatory element-luciferase and HIF-1alpha hypoxia regulatory element-DNA binding. To analyze the HIF-1alpha domain inhibited by AJM290, we transfected cells with plasmids expressing a fusion protein of Gal linked to HIF-1alpha or HIF-1alpha COOH-terminal transactivation domain (CAD) with a Gal4-responsive luciferase reporter gene. AJM290 inhibited both the full-length HIF-1alpha and HIF-1alpha CAD transcriptional activity. CONCLUSIONS AJM290 and AW464 are inhibitors of HIF-1alpha CAD transcription activity and DNA binding, but they also inhibit degradation of HIF, in contrast to other Trx inhibitors.
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Affiliation(s)
- Dylan T Jones
- Cancer Research UK Growth Factor Group, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, UK
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Tao L, Jiao X, Gao E, Lau WB, Yuan Y, Lopez B, Christopher T, RamachandraRao SP, Williams W, Southan G, Sharma K, Koch W, Ma XL. Nitrative inactivation of thioredoxin-1 and its role in postischemic myocardial apoptosis. Circulation 2006; 114:1395-402. [PMID: 16966583 DOI: 10.1161/circulationaha.106.625061] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Intracellular proteins involved in oxidative stress and apoptosis are nitrated in diseased tissues but not in normal tissues; definitive evidence to support a causative link between a specific protein that is nitratively modified with tissue injury in a specific disease is limited, however. The aims of the present study were to determine whether thioredoxin (Trx), a novel antioxidant and antiapoptotic molecule, is susceptible to nitrative inactivation and to establish a causative link between Trx nitration and postischemic myocardial apoptosis. METHODS AND RESULTS In vitro exposure of human Trx-1 to 3-morpholinosydnonimine resulted in significant Trx-1 nitration and almost abolished Trx-1 activity. 3-morpholinosydnonimine-induced nitrative Trx-1 inactivation was completely blocked by MnTE-2-PyP(5+) (a superoxide dismutase mimetic) and markedly attenuated by PTIO (a nitric oxide scavenger). Administration of either reduced or oxidized Trx-1 in vivo attenuated myocardial ischemia/reperfusion injury (>50% reduction in apoptosis and infarct size, P<0.01). However, administration of nitrated Trx-1 failed to exert a cardioprotective effect. In cardiac tissues obtained from ischemic/reperfused heart, significant Trx-1 nitration was detected, Trx activity was markedly inhibited, Trx-1/ASK1 (apoptosis signal-regulating kinase-1) complex formation was abolished, and apoptosis signal-regulating kinase-1 activity was increased. Treatment with either FP15 (a peroxynitrite decomposition catalyst) or MnTE-2-PyP(5+) 10 minutes before reperfusion blocked nitrative Trx inactivation, attenuated apoptosis signal-regulating kinase-1 activation, and reduced postischemic myocardial apoptosis. CONCLUSIONS These results strongly suggest that nitrative inactivation of Trx plays a proapoptotic role under those pathological conditions in which production of reactive nitrogen species is increased and that antinitrating treatment may have therapeutic value in those diseases, such as myocardial ischemia/reperfusion, in which pathological apoptosis is increased.
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Affiliation(s)
- Ling Tao
- Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA, USA
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Burke-Gaffney A, Callister MEJ, Nakamura H. Thioredoxin: friend or foe in human disease? Trends Pharmacol Sci 2006; 26:398-404. [PMID: 15990177 DOI: 10.1016/j.tips.2005.06.005] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2004] [Revised: 05/16/2005] [Accepted: 06/16/2005] [Indexed: 10/25/2022]
Abstract
Thioredoxin (Trx), a small, ubiquitous thiol [sulfydryl (-SH)] protein, is one of the most important regulators of reduction-oxidation (redox) balance and, thus, redox-controlled cell functions. Although Trx was discovered 40 years ago in bacteria, the number and diversity of processes that Trx influences in human cells have only been appreciated recently. Processes influenced by Trx include the control of cellular redox balance, the promotion of cell growth, the inhibition of apoptosis and the modulation of inflammation. Not surprisingly, the role of Trx in a wide range of human diseases and conditions, including cancer, viral disease, ischaemia-reperfusion injury, cardiac conditions, aging, premature birth and newborn physiology, is subject to intense investigation. However, whether Trx contributes to or prevents the pathology of a particular condition is not always clear. In this article, we review the role of Trx in human disease and relate this to its redox activity and biological properties, and discuss the development and use of therapies that either inhibit or augment Trx activity.
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Affiliation(s)
- Anne Burke-Gaffney
- Unit of Critical Care, National Heart and Lung Institute Division, Imperial College Faculty of Medicine, Dovehouse Street, London SW3 6LY, UK.
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