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Mouradian M, Ma IV, Vicente ED, Kikawa KD, Pardini RS. Docosahexaenoic Acid-mediated Inhibition of Heat Shock Protein 90-p23 Chaperone Complex and Downstream Client Proteins in Lung and Breast Cancer. Nutr Cancer 2016; 69:92-104. [PMID: 27880046 DOI: 10.1080/01635581.2017.1247886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The molecular chaperone, heat shock protein 90 (Hsp90), is a critical regulator for the proper folding and stabilization of several client proteins, and is a major contributor to carcinogenesis. Specific Hsp90 inhibitors have been designed to target the ATP-binding site in order to prevent Hsp90 chaperone maturation. The current study investigated the effects of docosahexaenoic acid (DHA; C22:6 n-3) on Hsp90 function and downstream client protein expression. In vitro analyses of BT-474 human breast carcinoma and A549 human lung adenocarcinoma cell lines revealed dose-dependent decreases in intracellular ATP levels by DHA treatment, resulting in a significant reduction of Hsp90 and p23 association in both cell lines. Attenuation of the Hsp90-p23 complex led to the inhibition of Hsp90 client proteins, epidermal growth factor receptor 2 (ErbB2), and hypoxia-inducible factor 1α (HIF-1α). Similar results were observed when employing 2-deoxyglucose (2-DG), confirming that DHA and 2-DG, both independently and combined, can disturb Hsp90 molecular chaperone function. In vivo A549 xenograft analysis also demonstrated decreased expression levels of Hsp90-p23 association and diminished protein levels of ErbB2 and HIF-1α in mice supplemented with dietary DHA. These data support a role for dietary intervention to improve cancer therapy in tumors overexpressing Hsp90 and its client proteins.
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Affiliation(s)
- Michael Mouradian
- a Department of Biochemistry and Molecular Biology , University of Nevada , Reno , NV , USA
| | - Irvin V Ma
- a Department of Biochemistry and Molecular Biology , University of Nevada , Reno , NV , USA
| | - Erika D Vicente
- a Department of Biochemistry and Molecular Biology , University of Nevada , Reno , NV , USA
| | - Keith D Kikawa
- a Department of Biochemistry and Molecular Biology , University of Nevada , Reno , NV , USA
| | - Ronald S Pardini
- a Department of Biochemistry and Molecular Biology , University of Nevada , Reno , NV , USA
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52
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Roy SS, Kapoor M. In silico identification and computational analysis of the nucleotide binding site in the C-terminal domain of Hsp90. J Mol Graph Model 2016; 70:253-274. [PMID: 27771574 DOI: 10.1016/j.jmgm.2016.10.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 10/02/2016] [Indexed: 12/28/2022]
Abstract
Hsp90 contains two distinct Nucleotide Binding Sites (NBS), in its N-terminal domain (NTD) and C-terminal domain (CTD), respectively. The NTD site belongs to the GHKL super-family of ATPases and has been the subject of extensive characterization. However, a structure of the nucleotide-bound form of CTD is still unavailable. In this study molecular modeling was employed to incorporate experimental data using partial constructs of the CTD, from work published by many research groups, onto existing structural models of its apo- form. Our attempts to locate potential nucleotide ligand-binding sites or cavities yielded one major candidate-a structurally unconventional site-exhibiting the requisite shape and volume for accommodation of tri-phosphate nucleotides. Its structure was refined by molecular dynamics (MD)-based techniques. We reproducibly docked the Mg2+ complexed form of ATP, GTP, CTP, TTP and UTP to this putative NBS. These docking simulations and calculated ligand-binding scores are in general agreement with published data about experimentally measured binding to the CTD. The overall pattern of interactions between residues lining the site and docked nucleotides is conserved and broadly similar to that of other nucleotide-binding sites. Our docking simulations suggest that nucleotide binding stabilizes the only structurally labile region, thereby providing a rationale for the increased resistance to thermal denaturation and proteolysis. The docked nucleotides do not intrude onto the surface of residues involved in dimerization or chaperoning. Our molecular modeling permitted recognition of larger structural changes in the nucleotide-bound CTD dimer, including stabilization of helix-2 in both chains and intra- and inter- chain interactions between three residues (I613, Q617, R620).
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Affiliation(s)
- Samir S Roy
- Department of Biological Sciences, The University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada
| | - Manju Kapoor
- Department of Biological Sciences, The University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada.
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53
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Pearl LH. Review: The HSP90 molecular chaperone-an enigmatic ATPase. Biopolymers 2016; 105:594-607. [PMID: 26991466 PMCID: PMC4879513 DOI: 10.1002/bip.22835] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 03/09/2016] [Accepted: 03/12/2016] [Indexed: 12/16/2022]
Abstract
The HSP90 molecular chaperone is involved in the activation and cellular stabilization of a range of 'client' proteins, of which oncogenic protein kinases and nuclear steroid hormone receptors are of particular biomedical significance. Work over the last two decades has revealed a conformational cycle critical to the biological function of HSP90, coupled to an inherent ATPase activity that is regulated and manipulated by many of the co-chaperones proteins with which it collaborates. Pharmacological inhibition of HSP90 ATPase activity results in degradation of client proteins in vivo, and is a promising target for development of new cancer therapeutics. Despite this, the actual function that HSP90s conformationally-coupled ATPase activity provides in its biological role as a molecular chaperone remains obscure. © 2016 Wiley Periodicals, Inc. Biopolymers 105: 594-607, 2016.
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Affiliation(s)
- Laurence H Pearl
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QR, UK
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54
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Steinhäuser SS, Andrésson ÓS, Pálsson A, Werth S. Fungal and cyanobacterial gene expression in a lichen symbiosis: Effect of temperature and location. Fungal Biol 2016; 120:1194-208. [PMID: 27647237 DOI: 10.1016/j.funbio.2016.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 05/27/2016] [Accepted: 07/07/2016] [Indexed: 10/21/2022]
Abstract
Organisms have evolved different cellular mechanisms to deal with environmental stress, primarily through complex molecular mechanisms including protein refolding and DNA repair. As mutualistic symbioses, lichens offer the possibility of analyzing molecular stress responses in a particularly tight interspecific relationship. We study the widespread cyanolichen Peltigera membranacea, a key player in carbon and nitrogen cycling in terrestrial ecosystems at northern latitudes. We ask whether increased temperature is reflected in mRNA levels of selected damage control genes, and do the response patterns show geographical associations? Using real-time PCR quantification of 38 transcripts, differential expression was demonstrated for nine cyanobacterial and nine fungal stress response genes (plus the fungal symbiosis-related lec2 gene) when the temperature was increased from 5 °C to 15 °C and 25 °C. Principle component analysis (PCA) revealed two gene groups with different response patterns. Whereas a set of cyanobacterial DNA repair genes and the fungal lec2 (PC1 group) showed an expression drop at 15 °C vs. 5 °C, most fungal candidates (PC2 group) showed increased expression at 25 °C vs. 5 °C. PC1 responses also correlated with elevation. The correlated downregulation of lec2 and cyanobacterial DNA repair genes suggests a possible interplay between the symbionts warranting further studies.
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Affiliation(s)
- Sophie S Steinhäuser
- Life and Environmental Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland
| | - Ólafur S Andrésson
- Life and Environmental Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland
| | - Arnar Pálsson
- Life and Environmental Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland
| | - Silke Werth
- Life and Environmental Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland; Institute of Plant Sciences, University of Graz, Holteigasse 6, 8010 Graz, Austria.
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55
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Perić M, Bou Dib P, Dennerlein S, Musa M, Rudan M, Lovrić A, Nikolić A, Šarić A, Sobočanec S, Mačak Ž, Raimundo N, Kriško A. Crosstalk between cellular compartments protects against proteotoxicity and extends lifespan. Sci Rep 2016; 6:28751. [PMID: 27346163 PMCID: PMC4921836 DOI: 10.1038/srep28751] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 06/08/2016] [Indexed: 11/09/2022] Open
Abstract
In cells living under optimal conditions, protein folding defects are usually prevented by the action of chaperones. Here, we investigate the cell-wide consequences of loss of chaperone function in cytosol, mitochondria or the endoplasmic reticulum (ER) in budding yeast. We find that the decline in chaperone activity in each compartment results in loss of respiration, demonstrating the dependence of mitochondrial activity on cell-wide proteostasis. Furthermore, each chaperone deficiency triggers a response, presumably via the communication among the folding environments of distinct cellular compartments, termed here the cross-organelle stress response (CORE). The proposed CORE pathway encompasses activation of protein conformational maintenance machineries, antioxidant enzymes, and metabolic changes simultaneously in the cytosol, mitochondria, and the ER. CORE induction extends replicative and chronological lifespan in budding yeast, highlighting its protective role against moderate proteotoxicity and its consequences such as the decline in respiration. Our findings accentuate that organelles do not function in isolation, but are integrated in a functional crosstalk, while also highlighting the importance of organelle communication in aging and age-related diseases.
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Affiliation(s)
- Matea Perić
- Mediterranean Institute for Life Sciences - MedILS, Meštrovićevo šetalište 45, 21000 Split, Croatia
| | - Peter Bou Dib
- Universitätsmedizin Göttingen, Institut für Zellbiochemie, Humboldtallee 23, D-37073 Göttingen, Germany
| | - Sven Dennerlein
- Universitätsmedizin Göttingen, Institut für Zellbiochemie, Humboldtallee 23, D-37073 Göttingen, Germany
| | - Marina Musa
- Mediterranean Institute for Life Sciences - MedILS, Meštrovićevo šetalište 45, 21000 Split, Croatia
| | - Marina Rudan
- Mediterranean Institute for Life Sciences - MedILS, Meštrovićevo šetalište 45, 21000 Split, Croatia
| | - Anita Lovrić
- Mediterranean Institute for Life Sciences - MedILS, Meštrovićevo šetalište 45, 21000 Split, Croatia
| | - Andrea Nikolić
- Mediterranean Institute for Life Sciences - MedILS, Meštrovićevo šetalište 45, 21000 Split, Croatia
| | - Ana Šarić
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Sandra Sobočanec
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Željka Mačak
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - Nuno Raimundo
- Universitätsmedizin Göttingen, Institut für Zellbiochemie, Humboldtallee 23, D-37073 Göttingen, Germany
| | - Anita Kriško
- Mediterranean Institute for Life Sciences - MedILS, Meštrovićevo šetalište 45, 21000 Split, Croatia
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56
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Davtyan A, Platkov M, Gruebele M, Papoian GA. Stochastic Resonance in Protein Folding Dynamics. Chemphyschem 2016; 17:1305-13. [PMID: 26992148 DOI: 10.1002/cphc.201501125] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Indexed: 11/09/2022]
Abstract
Although protein folding reactions are usually studied under static external conditions, it is likely that proteins fold in a locally fluctuating cellular environment in vivo. To mimic such behavior in in vitro experiments, the local temperature of the solvent can be modulated either harmonically or using correlated noise. In this study, coarse-grained molecular simulations are used to investigate these possibilities, and it is found that both periodic and correlated random fluctuations of the environment can indeed accelerate folding kinetics if the characteristic frequencies of the applied fluctuations are commensurate with the internal timescale of the folding reaction; this is consistent with the phenomenon of stochastic resonance observed in many other condensed-matter processes. To test this theoretical prediction, the folding dynamics of phosphoglycerate kinase under harmonic temperature fluctuations are experimentally probed using Förster resonance energy transfer fluorescence measurements. To analyze these experiments, a combination of theoretical approaches is developed, including stochastic simulations of folding kinetics and an analytical mean-field kinetic theory. The experimental observations are consistent with the theoretical predictions of stochastic resonance in phosphoglycerate kinase folding. When combined with an alternative experiment on the protein VlsE using a power spectrum analysis, elaborated in Dave et al., ChemPhysChem 2016, 10.1002/cphc.201501041, the overall data overwhelmingly point to the experimental confirmation of stochastic resonance in protein folding dynamics.
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Affiliation(s)
- Aram Davtyan
- Department of Chemistry and Institute for Biophysical Dynamics, Computation Institute, James Franck Institute, University of Chicago, Chicago, Illinois, 60637, USA
| | - Max Platkov
- Department of Physics, Ariel University, Ariel, 40770, Israel
| | - Martin Gruebele
- Department of Chemistry and Physics and, Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Garegin A Papoian
- Department of Chemistry and Biochemistry and, Institute for Physical Science and Technology, University of Maryland, College Park, MD, 20742, USA.
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57
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Clare DK, Saibil HR. ATP-driven molecular chaperone machines. Biopolymers 2016; 99:846-59. [PMID: 23877967 PMCID: PMC3814418 DOI: 10.1002/bip.22361] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 07/08/2013] [Indexed: 01/17/2023]
Abstract
This review is focused on the mechanisms by which ATP binding and hydrolysis drive chaperone machines assisting protein folding and unfolding. A survey of the key, general chaperone systems Hsp70 and Hsp90, and the unfoldase Hsp100 is followed by a focus on the Hsp60 chaperonin machine which is understood in most detail. Cryo-electron microscopy analysis of the E. coli Hsp60 GroEL reveals intermediate conformations in the ATPase cycle and in substrate folding. These structures suggest a mechanism by which GroEL can forcefully unfold and then encapsulate substrates for subsequent folding in isolation from all other binding surfaces.
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Affiliation(s)
- Daniel K Clare
- Department of Crystallography, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
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58
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Docter BE, Horowitz S, Gray MJ, Jakob U, Bardwell JCA. Do nucleic acids moonlight as molecular chaperones? Nucleic Acids Res 2016; 44:4835-45. [PMID: 27105849 PMCID: PMC4889950 DOI: 10.1093/nar/gkw291] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 04/08/2016] [Indexed: 01/17/2023] Open
Abstract
Organisms use molecular chaperones to combat the unfolding and aggregation of proteins. While protein chaperones have been widely studied, here we demonstrate that DNA and RNA exhibit potent chaperone activity in vitro Nucleic acids suppress the aggregation of classic chaperone substrates up to 300-fold more effectively than the protein chaperone GroEL. Additionally, RNA cooperates with the DnaK chaperone system to refold purified luciferase. Our findings reveal a possible new role for nucleic acids within the cell: that nucleic acids directly participate in maintaining proteostasis by preventing protein aggregation.
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Affiliation(s)
- Brianne E Docter
- Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Scott Horowitz
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA Howard Hughes Medical Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Michael J Gray
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ursula Jakob
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - James C A Bardwell
- Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI 48109, USA Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA Howard Hughes Medical Institute, University of Michigan, Ann Arbor, MI 48109, USA
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59
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Finka A, Mattoo RUH, Goloubinoff P. Experimental Milestones in the Discovery of Molecular Chaperones as Polypeptide Unfolding Enzymes. Annu Rev Biochem 2016; 85:715-42. [PMID: 27050154 DOI: 10.1146/annurev-biochem-060815-014124] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Molecular chaperones control the cellular folding, assembly, unfolding, disassembly, translocation, activation, inactivation, disaggregation, and degradation of proteins. In 1989, groundbreaking experiments demonstrated that a purified chaperone can bind and prevent the aggregation of artificially unfolded polypeptides and use ATP to dissociate and convert them into native proteins. A decade later, other chaperones were shown to use ATP hydrolysis to unfold and solubilize stable protein aggregates, leading to their native refolding. Presently, the main conserved chaperone families Hsp70, Hsp104, Hsp90, Hsp60, and small heat-shock proteins (sHsps) apparently act as unfolding nanomachines capable of converting functional alternatively folded or toxic misfolded polypeptides into harmless protease-degradable or biologically active native proteins. Being unfoldases, the chaperones can proofread three-dimensional protein structures and thus control protein quality in the cell. Understanding the mechanisms of the cellular unfoldases is central to the design of new therapies against aging, degenerative protein conformational diseases, and specific cancers.
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Affiliation(s)
- Andrija Finka
- Laboratory of Biophysical Statistics, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Rayees U H Mattoo
- Department of Structural Biology, Stanford University, Stanford, California 94305;
| | - Pierre Goloubinoff
- Department of Plant Molecular Biology, Faculty of Biology and Medicine, University of Lausanne, CH-1015 Lausanne, Switzerland;
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60
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Wan D, Wang X, Wu Q, Lin P, Pan Y, Sattar A, Huang L, Ahmad I, Zhang Y, Yuan Z. Integrated Transcriptional and Proteomic Analysis of Growth Hormone Suppression Mediated by Trichothecene T-2 Toxin in Rat GH3 Cells. Toxicol Sci 2015; 147:326-38. [PMID: 26141394 DOI: 10.1093/toxsci/kfv131] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023] Open
Abstract
Chronic exposure to trichothecenes is known to disturb insulin-like growth factor 1 and signaling of insulin and leptin hormones and causes considerable growth retardation in animals. However, limited information was available on mechanisms underlying trichothecene-induced growth retardation. In this study, we employed an integrated transcriptomics, proteomics, and RNA interference (RNAi) approach to study the molecular mechanisms underlying trichothecene cytotoxicity in rat pituitary adenoma GH3 cells. Our results showed that trichothecenes suppressed the synthesis of growth hormone 1 (Gh1) and inhibited the eukaryotic transcription and translation initiation by suppressing aminoacyl-tRNA synthetases transcription, inducing eukaryotic translation initiation factor 2-alpha kinase 2 (EIF2AK2) and reducing eukaryotic translation initiation factor 5 a. The sulfhydryl oxidases , protein disulfide isomerase,and heat shock protein 90 (were greatly reduced, which resulted in adverse regulation of protein processing and folding. Differential genes and proteins associated with a decline in energy metabolism and cell cycle arrest were also found in our study. However, use of RNAi to interfere with hemopoietic cell kinase (Hck) and EIF2AK2 transcriptions or use of chemical inhibitors of MAPK, p38, Ras, and JNK partially reversed the reduction of Gh1 levels induced by trichothecenes. It indicated that the activation of MAPKs, Hck, and EIF2AK2 were important for trichothecene-induced growth hormone suppression. Considering the potential hazards of exposure to trichothecenes, our findings could help to improve our understanding regarding human and animal health implications.
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Affiliation(s)
- Dan Wan
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China; Research Center of Healthy Livestock Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China
| | - Xu Wang
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Qinghua Wu
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; College of Life Science, Yangtze University, Jingzhou, Hubei, China; and Center for Basic and Applied Research, Faculty of Informatics and Management, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Pingping Lin
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Yuanhu Pan
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Adeel Sattar
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Lingli Huang
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University
| | - Ijaz Ahmad
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
| | - Yuanyuan Zhang
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University
| | - Zonghui Yuan
- *National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University; Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China;
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61
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Bartekova M, Barancik M, Pokusa M, Prokopova B, Radosinska J, Rusnak A, Breier A, Jezova D. Molecular changes induced by repeated restraint stress in the heart: the effect of oxytocin receptor antagonist atosiban. Can J Physiol Pharmacol 2015; 93:827-34. [DOI: 10.1139/cjpp-2015-0096] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Even though stress belongs to the most common lifestyle risk factors of cardiovascular diseases, there are only limited data on direct influence of stressors on the heart. The aim of the present study was to explore selected protein signaling pathways in response to repeated immobilization stress in the heart tissue. Effects of simultaneous treatment with atosiban, an oxytocin receptor antagonist, on stress-induced changes in the heart were also investigated. Male Wistar rats were exposed to repeated immobilization (2 h daily, lasting 2 weeks). The results showed increased phosphorylation of Akt kinase, enhanced levels of Bcl-2, and decreased levels of cleaved caspase-3 in the left ventricle in response to chronic stress independently of the treatment. Exposure to restraint led to the rise of HSP-90 and p53 in vehicle-treated rats only. Stress failed to modify MMP-2 activity and ultrastructure of the heart tissue. Treatment with the oxytocin/vasopressin receptor antagonist atosiban reversed stress-induced rise in HSP-90 and p53 proteins. In conclusion, our data demonstrate that repeated restraint stress induces Akt kinase activation and this is associated with elevation of anti-apoptotic proteins (Bcl-2) and down-regulation of pro-apoptotic proteins (cleaved caspase-3). These findings suggest that activation of pro-survival anti-apoptotic Akt kinase pathway plays an important role in molecular mechanisms underlying responses and adaptation of the rat heart to repeated stress exposure. The results further indicate a regulatory role of oxytocin/vasopressin in the control of stress-induced activation in HSP-90 and related proteins.
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Affiliation(s)
- Monika Bartekova
- Institute for Heart Research, Slovak Academy of Sciences, Bratislava, Slovak Republic
- Institute of Physiology, Faculty of Medicine, Comenius University in Bratislava, Slovak Republic
| | - Miroslav Barancik
- Institute for Heart Research, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Michal Pokusa
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Barbora Prokopova
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovak Republic
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University in Bratislava, Slovak Republic
| | - Jana Radosinska
- Institute for Heart Research, Slovak Academy of Sciences, Bratislava, Slovak Republic
- Institute of Physiology, Faculty of Medicine, Comenius University in Bratislava, Slovak Republic
| | - Andrej Rusnak
- Institute of Molecular Physiology and Genetics, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Albert Breier
- Institute of Molecular Physiology and Genetics, Slovak Academy of Sciences, Bratislava, Slovak Republic
- Institute of Biochemistry, Nutrition and Health Protection, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, Slovak Republic
| | - Daniela Jezova
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovak Republic
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62
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Saeed H, Shalaby M, Embaby A, Ismael M, Pathan A, Ataya F, Alanazi M, Bassiouny K. The Arabian camel Camelus dromedarius heat shock protein 90α: cDNA cloning, characterization and expression. Int J Biol Macromol 2015; 81:195-204. [PMID: 26234578 DOI: 10.1016/j.ijbiomac.2015.07.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 07/26/2015] [Accepted: 07/28/2015] [Indexed: 12/30/2022]
Abstract
Heat shock protein 90 (Hsp90) is a highly conserved ubiquitous molecular chaperone contributing to assisting folding, maintenance of structural integrity and proper regulation of a subset of cytosolic proteins. In the present study, a heat shock protein 90α full length coding cDNA was isolated and cloned from the Arabian one-humped camel by reverse transcription polymerase chain reaction (RT-PCR). The full length cDNA sequence was submitted to NCBI GeneBank under the accession number KF612338. The sequence analysis of the Arabian camel Hsp90α cDNA showed 2202bp encoding a protein of 733 amino acids with estimated molecular mass of 84.827kDa and theoretical isoelectric point (pI) of 5.31. Blast search analysis revealed that the C. dromedarius Hsp90α shared high similarity with other known Hsp90α. Comparative analyses of camel Hsp90α protein sequence with other mammalian Hsp90s showed high identity (85-94%). Heterologous expression of camel Hsp90α cDNA in E. coli JM109 (DE3) gave a fusion protein band of 86.0kDa after induction with IPTG for 4h.
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Affiliation(s)
- Hesham Saeed
- Department of Biotechnology, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt.
| | - Manal Shalaby
- Genetic Engineering and Biotechnology Research Institute (GEBRI), City for Scientific Research and Technology Applications, Alexandria, Egypt
| | - Amira Embaby
- Department of Biotechnology, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt
| | - Mohammad Ismael
- Biochemistry Department, College of Science King Saud University, Bld. 5, Lab AA10, P.O. Box 2454, Riyadh, Saudi Arabia
| | - Akbar Pathan
- Biochemistry Department, College of Science King Saud University, Bld. 5, Lab AA10, P.O. Box 2454, Riyadh, Saudi Arabia; Integrated Gulf Biosystems, Riyadh 11391, Saudi Arabia
| | - Farid Ataya
- Biochemistry Department, College of Science King Saud University, Bld. 5, Lab AA10, P.O. Box 2454, Riyadh, Saudi Arabia; National Research Centre, 33 El-Bohouth St. (Former El-Tahrir St.), P.O. 12622, Dokki, Giza, Egypt
| | - Mohammad Alanazi
- Biochemistry Department, College of Science King Saud University, Bld. 5, Lab AA10, P.O. Box 2454, Riyadh, Saudi Arabia
| | - Khalid Bassiouny
- Molecular Biology Department, Genetic Engineering and Biotechnology Institute, University of Sadat City, Egypt
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Franco MC, Ricart KC, Gonzalez AS, Dennys CN, Nelson PA, Janes MS, Mehl RA, Landar A, Estévez AG. Nitration of Hsp90 on Tyrosine 33 Regulates Mitochondrial Metabolism. J Biol Chem 2015; 290:19055-66. [PMID: 26085096 PMCID: PMC4521030 DOI: 10.1074/jbc.m115.663278] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 06/12/2015] [Indexed: 11/06/2022] Open
Abstract
Peroxynitrite production and tyrosine nitration are present in several pathological conditions, including neurodegeneration, stroke, aging, and cancer. Nitration of the pro-survival chaperone heat shock protein 90 (Hsp90) in position 33 and 56 induces motor neuron death through a toxic gain-of-function. Here we show that nitrated Hsp90 regulates mitochondrial metabolism independently of the induction of cell death. In PC12 cells, a small fraction of nitrated Hsp90 was located on the mitochondrial outer membrane and down-regulated mitochondrial membrane potential, oxygen consumption, and ATP production. Neither endogenous Hsp90 present in the homogenate nor unmodified and fully active recombinant Hsp90 was able to compete with the nitrated protein for the binding to mitochondria. Moreover, endogenous or recombinant Hsp90 did not prevent the decrease in mitochondrial activity but supported nitrated Hsp90 mitochondrial gain-of-function. Nitrotyrosine in position 33, but not in any of the other four tyrosine residues prone to nitration in Hsp90, was sufficient to down-regulate mitochondrial activity. Thus, in addition to induction of cell death, nitrated Hsp90 can also regulate mitochondrial metabolism, suggesting that depending on the cell type, distinct Hsp90 nitration states regulate different aspects of cellular metabolism. This regulation of mitochondrial homeostasis by nitrated Hsp90 could be of particular relevance in cancer cells.
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Affiliation(s)
- Maria C Franco
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32827,
| | - Karina C Ricart
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama 35294
| | - Analía S Gonzalez
- Laboratory of Oxygen Metabolism, University Hospital, University of Buenos Aires, Buenos Aires C1120AAR, Argentina
| | - Cassandra N Dennys
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32827
| | - Pascal A Nelson
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32827
| | | | - Ryan A Mehl
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331
| | - Aimee Landar
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama 35294
| | - Alvaro G Estévez
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32827
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64
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Lepvrier E, Nigen M, Moullintraffort L, Chat S, Allegro D, Barbier P, Thomas D, Nazabal A, Garnier C. Hsp90 oligomerization process: How can p23 drive the chaperone machineries? BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:1412-24. [PMID: 26151834 DOI: 10.1016/j.bbapap.2015.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 06/28/2015] [Accepted: 07/02/2015] [Indexed: 01/16/2023]
Abstract
The 90-kDa heat shock protein (Hsp90) is a highly flexible dimer that is able to self-associate in the presence of divalent cations or under heat shock. In a previous work, we focused on the Mg2+-induced oligomerization process of Hsp90, and characterized the oligomers. Combining analytical ultracentrifugation, size-exclusion chromatography coupled to multi-angle laser light scattering and high-mass matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, we studied the interaction of p23 with both Hsp90 dimer and oligomers. Even if p23 predominantly binds the Hsp90 dimer, we demonstrated, for the first time, that p23 is also able to interact with Hsp90 oligomers, shifting the Hsp90 dimer-oligomers equilibrium toward dimer. Our results showed that the Hsp90:p23 binding stoichiometry decreases with the Hsp90 oligomerization degree. Therefore, we propose a model in which p23 would act as a "protein wedge" regarding the Hsp90 dimer closure and the Hsp90 oligomerization process.
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Affiliation(s)
- Eléonore Lepvrier
- Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 35042 Rennes Cedex, France
| | - Michaël Nigen
- UMR1208 Ingénierie des Agropolymères et Technologies Emergentes INRA-Montpellier SupAgro-CIRAD-Université Montpellier, 2 Place Pierre Viala, F-34060 Montpellier, France
| | - Laura Moullintraffort
- Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 35042 Rennes Cedex, France
| | - Sophie Chat
- Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 35042 Rennes Cedex, France
| | - Diane Allegro
- Aix-Marseille Université, INSERM UMR 911, Centre de Recherche en Oncologie biologique et Onco-pharmacologie, 13385 Marseille Cedex 5, France
| | - Pascale Barbier
- Aix-Marseille Université, INSERM UMR 911, Centre de Recherche en Oncologie biologique et Onco-pharmacologie, 13385 Marseille Cedex 5, France
| | - Daniel Thomas
- Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 35042 Rennes Cedex, France
| | | | - Cyrille Garnier
- Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 35042 Rennes Cedex, France.
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Lepvrier E, Moullintraffort L, Nigen M, Goude R, Allegro D, Barbier P, Peyrot V, Thomas D, Nazabal A, Garnier C. Hsp90 Oligomers Interacting with the Aha1 Cochaperone: An Outlook for the Hsp90 Chaperone Machineries. Anal Chem 2015; 87:7043-51. [PMID: 26076190 DOI: 10.1021/acs.analchem.5b00051] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The 90-kDa heat shock protein (Hsp90) is a highly flexible dimer able to self-associate in the presence of divalent cations or under heat shock. This study investigated the relationship between Hsp90 oligomers and the Hsp90 cochaperone Aha1 (activator of Hsp90 ATPase). The interactions of Aha1 with Hsp90 dimers and oligomers were evaluated by ultracentrifugation, size-exclusion chromatography coupled to multiangle laser light scattering and high-mass matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Hsp90 dimer was able to bind up to four Aha1 molecules, and Hsp90 oligomers are also able to interact with Aha1. The binding of Aha1 did not interfere with the Hsp90 oligomerization process. Except for Hsp90 dimer, the stoichiometry of the interaction remained constant, at 2 Aha1 molecules per Hsp90 dimer, regardless of the degree of Hsp90 oligomerization. Moreover, Aha1 predominantly bound to Hsp90 oligomers. Thus, the ability of Hsp90 oligomers to bind the Aha1 ATPase activator reinforces their role within the Hsp90 chaperone machineries.
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Affiliation(s)
- Eléonore Lepvrier
- †Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 263 Avenue du Général Leclerc, 35042 Rennes, Cedex, France
| | - Laura Moullintraffort
- †Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 263 Avenue du Général Leclerc, 35042 Rennes, Cedex, France
| | - Michaël Nigen
- ‡UMR1208 Ingénierie des Agropolymères et Technologies Emergentes INRA-Montpellier SupAgro-CIRAD, Université Montpellier, 2 Place Pierre Viala, F-34060 Montpellier, France
| | - Renan Goude
- §Microbiologie risques infectieux, EA 1254, Université de Rennes 1, Campus Beaulieu, 35042 Rennes, Cedex, France
| | - Diane Allegro
- ∥Aix-Marseille Université, INSERM UMR 911, Centre de Recherche en Oncologie biologique et Onco-pharmacologie, 13385 Marseille, Cedex 5, France
| | - Pascale Barbier
- ∥Aix-Marseille Université, INSERM UMR 911, Centre de Recherche en Oncologie biologique et Onco-pharmacologie, 13385 Marseille, Cedex 5, France
| | - Vincent Peyrot
- ∥Aix-Marseille Université, INSERM UMR 911, Centre de Recherche en Oncologie biologique et Onco-pharmacologie, 13385 Marseille, Cedex 5, France
| | - Daniel Thomas
- †Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 263 Avenue du Général Leclerc, 35042 Rennes, Cedex, France
| | | | - Cyrille Garnier
- †Translation and Folding, UMR-CNRS 6290, Université de Rennes 1, Campus Beaulieu, 263 Avenue du Général Leclerc, 35042 Rennes, Cedex, France
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66
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Xie Y, Song L, Weng Z, Liu S, Liu Z. Hsp90, Hsp60 and sHsp families of heat shock protein genes in channel catfish and their expression after bacterial infections. FISH & SHELLFISH IMMUNOLOGY 2015; 44:642-51. [PMID: 25827625 DOI: 10.1016/j.fsi.2015.03.027] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 02/25/2015] [Accepted: 03/20/2015] [Indexed: 05/26/2023]
Abstract
Heat shock proteins (Hsps) are a suite of highly conserved proteins whose expressions are generally induced by elevated temperature. However, many Hsps play important roles in both innate and adaptive immunity. On the basis of our previous work on Hsp40 and Hsp70 gene families in channel catfish (Ictalurus punctatus), the objective of this study was to characterize Hsp90, Hsp60, Hsp10, and small Hsp genes, and to investigate their expression profiles after bacterial infections. A total of 20 Hsp genes were identified and annotated in the channel catfish genome, including five Hsp90 genes, one Hsp60 gene, one Hsp10 gene, and 13 sHsp genes. Six Hsp genes were differentially expressed after Edwardsiella ictaluri infection, and 12 were differentially expressed after Flavobacterium columnare infection. Although expression of these genes exhibited both temporal and spatial regulation, the induction of Hsp genes was observed soon after bacterial infection, while the suppression of Hsp genes was observed at later time-points, suggesting their distinct roles in immune responses and disease defenses. A pathogen-specific expression pattern of Hsp90 was observed. After F. columnare infection, all Hsp90 genes were found up-regulated except Hsp90ab1, which was not significantly regulated. However, after E. ictaluri infection, only one Hsp90 gene was found significantly down-regulated. Both pathogen-specific and tissue-specific pattern of expression were observed with small Hsps after E. ictaluri and F. columnare bacterial infections. These results suggested that most of Hsp genes may play important roles in immune response and/or disease defense in channel catfish.
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Affiliation(s)
- Yangjie Xie
- The Fish Molecular Genetics and Biotechnology Laboratory, Aquatic Genomics Unit, School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; Fisheries College, Jimei University, Xiamen 361021, PR China
| | - Lin Song
- The Fish Molecular Genetics and Biotechnology Laboratory, Aquatic Genomics Unit, School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA
| | - Zhaohong Weng
- The Fish Molecular Genetics and Biotechnology Laboratory, Aquatic Genomics Unit, School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA; Fisheries College, Jimei University, Xiamen 361021, PR China
| | - Shikai Liu
- The Fish Molecular Genetics and Biotechnology Laboratory, Aquatic Genomics Unit, School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA
| | - Zhanjiang Liu
- The Fish Molecular Genetics and Biotechnology Laboratory, Aquatic Genomics Unit, School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA.
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67
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Proteomics in cancer biomarkers discovery: challenges and applications. DISEASE MARKERS 2015; 2015:321370. [PMID: 25999657 PMCID: PMC4427011 DOI: 10.1155/2015/321370] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 01/15/2015] [Accepted: 02/18/2015] [Indexed: 01/28/2023]
Abstract
With the introduction of recent high-throughput technologies to various fields of science and medicine, it is becoming clear that obtaining large amounts of data is no longer a problem in modern research laboratories. However, coherent study designs, optimal conditions for obtaining high-quality data, and compelling interpretation, in accordance with the evidence-based systems biology, are critical factors in ensuring the emergence of good science out of these recent technologies. This review focuses on the proteomics field and its new perspectives on cancer research. Cornerstone publications that have tremendously helped scientists and clinicians to better understand cancer pathogenesis; to discover novel diagnostic and/or prognostic biomarkers; and to suggest novel therapeutic targets will be presented. The author of this review aims at presenting some of the relevant literature data that helped as a step forward in bridging the gap between bench work results and bedside potentials. Undeniably, this review cannot include all the work that is being produced by expert research groups all over the world.
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68
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Transcriptional Response to Acute Thermal Exposure in Juvenile Chinook Salmon Determined by RNAseq. G3-GENES GENOMES GENETICS 2015; 5:1335-49. [PMID: 25911227 PMCID: PMC4502368 DOI: 10.1534/g3.115.017699] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Thermal exposure is a serious and growing challenge facing fish species worldwide. Chinook salmon (Oncorhynchus tshawytscha) living in the southern portion of their native range are particularly likely to encounter warmer water due to a confluence of factors. River alterations have increased the likelihood that juveniles will be exposed to warm water temperatures during their freshwater life stage, which can negatively impact survival, growth, and development and pose a threat to dwindling salmon populations. To better understand how acute thermal exposure affects the biology of salmon, we performed a transcriptional analysis of gill tissue from Chinook salmon juveniles reared at 12° and exposed acutely to water temperatures ranging from ideal to potentially lethal (12° to 25°). Reverse-transcribed RNA libraries were sequenced on the Illumina HiSeq2000 platform and a de novo reference transcriptome was created. Differentially expressed transcripts were annotated using Blast2GO and relevant gene clusters were identified. In addition to a high degree of downregulation of a wide range of genes, we found upregulation of genes involved in protein folding/rescue, protein degradation, cell death, oxidative stress, metabolism, inflammation/immunity, transcription/translation, ion transport, cell cycle/growth, cell signaling, cellular trafficking, and structure/cytoskeleton. These results demonstrate the complex multi-modal cellular response to thermal stress in juvenile salmon.
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69
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Adams L, Franco MC, Estevez AG. Reactive nitrogen species in cellular signaling. Exp Biol Med (Maywood) 2015; 240:711-7. [PMID: 25888647 DOI: 10.1177/1535370215581314] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The transduction of cellular signals occurs through the modification of target molecules. Most of these modifications are transitory, thus the signal transduction pathways can be tightly regulated. Reactive nitrogen species are a group of compounds with different properties and reactivity. Some reactive nitrogen species are highly reactive and their interaction with macromolecules can lead to permanent modifications, which suggested they were lacking the specificity needed to participate in cell signaling events. However, the perception of reactive nitrogen species as oxidizers of macromolecules leading to general oxidative damage has recently evolved. The concept of redox signaling is now well established for a number of reactive oxygen and nitrogen species. In this context, the post-translational modifications introduced by reactive nitrogen species can be very specific and are active participants in signal transduction pathways. This review addresses the role of these oxidative modifications in the regulation of cell signaling events.
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Affiliation(s)
- Levi Adams
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA
| | - Maria C Franco
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA
| | - Alvaro G Estevez
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA
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70
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Barducci A, De Los Rios P. Non-equilibrium conformational dynamics in the function of molecular chaperones. Curr Opin Struct Biol 2015; 30:161-169. [PMID: 25771489 DOI: 10.1016/j.sbi.2015.02.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 01/23/2015] [Accepted: 02/13/2015] [Indexed: 01/18/2023]
Abstract
Why do chaperones need ATP hydrolysis to help proteins reach their native, functional states? In this review, we highlight the most recent experimental and theoretical evidences suggesting that ATP hydrolysis allows molecular chaperones to escape the bounds imposed by equilibrium thermodynamics. We argue here that energy consumption must be fully taken into account to understand the mechanism of these intrinsically non-equilibrium machines and we propose a novel perspective in the way the relation between function and ATP hydrolysis is viewed.
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Affiliation(s)
- Alessandro Barducci
- Laboratoire de Biophysique Statistique, School of Basic Sciences, École Polytechnique Fédérale de Lausanne (EPFL), CH 1015 Lausanne, Switzerland.
| | - Paolo De Los Rios
- Laboratoire de Biophysique Statistique, School of Basic Sciences, École Polytechnique Fédérale de Lausanne (EPFL), CH 1015 Lausanne, Switzerland.
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71
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Ciryam P, Kundra R, Morimoto RI, Dobson CM, Vendruscolo M. Supersaturation is a major driving force for protein aggregation in neurodegenerative diseases. Trends Pharmacol Sci 2015; 36:72-7. [PMID: 25636813 PMCID: PMC4643722 DOI: 10.1016/j.tips.2014.12.004] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 12/05/2014] [Accepted: 12/08/2014] [Indexed: 01/29/2023]
Abstract
The solubility of proteins is an essential requirement for their function. Nevertheless, these ubiquitous molecules can undergo aberrant aggregation when the protein homeostasis system becomes impaired. Here we ask: what are the driving forces for protein aggregation in the cellular environment? Emerging evidence suggests that this phenomenon arises at least in part because the native states of many proteins are inherently metastable when their cellular concentrations exceed their critical values. Such 'supersaturated' proteins, which form a 'metastable subproteome', are strongly driven towards aggregation, and are over-represented in specific biochemical pathways associated with neurodegenerative conditions. These observations suggest that effective therapeutic approaches designed to combat neurodegenerative diseases could be aimed at enhancing the ability of the cell to maintain the homeostasis of the metastable subproteome.
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Affiliation(s)
- Prajwal Ciryam
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK; Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, IL 60208, USA
| | - Rishika Kundra
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Richard I Morimoto
- Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, IL 60208, USA
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72
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Positive or negative involvement of heat shock proteins in multiple sclerosis pathogenesis: an overview. J Neuropathol Exp Neurol 2015; 73:1092-106. [PMID: 25383635 DOI: 10.1097/nen.0000000000000136] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Multiple sclerosis (MS) is the most diffuse chronic inflammatory disease of the central nervous system. Both immune-mediated and neurodegenerative processes apparently play roles in the pathogenesis of this disease. Heat shock proteins (HSPs) are a family of highly evolutionarily conserved proteins; their expression in the nervous system is induced in a variety of pathologic states, including cerebral ischemia, neurodegenerative diseases, epilepsy, and trauma. To date, investigators have observed protective effects of HSPs in a variety of brain disease models (e.g. of Alzheimer disease and Parkinson disease). In contrast, unequivocal data have been obtained for their roles in MS that depend on the HSP family and particularly on their localization (i.e. intracellular or extracellular). This article reviews our current understanding of the involvement of the principal HSP families in MS.
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73
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Santos Franco S, Raveh-Amit H, Kobolák J, Alqahtani MH, Mobasheri A, Dinnyes A. The crossroads between cancer stem cells and aging. BMC Cancer 2015; 15 Suppl 1:S1. [PMID: 25708542 PMCID: PMC4331724 DOI: 10.1186/1471-2407-15-s1-s1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The cancer stem cell (CSC) hypothesis suggests that only a subpopulation of cells within a tumour is responsible for the initiation and progression of neoplasia. The original and best evidence for the existence of CSCs came from advances in the field of haematological malignancies. Thus far, putative CSCs have been isolated from various solid and non-solid tumours and shown to possess self-renewal, differentiation, and cancer regeneration properties. Although research in the field is progressing extremely fast, proof of concept for the CSC hypothesis is still lacking and key questions remain unanswered, e.g. the cell of origin for these cells. Nevertheless, it is undisputed that neoplastic transformation is associated with genetic and epigenetic alterations of normal cells, and a better understanding of these complex processes is of utmost importance for developing new anti-cancer therapies. In the present review, we discuss the CSC hypothesis with special emphasis on age-associated alterations that govern carcinogenesis, at least in some types of tumours. We present evidence from the scientific literature for age-related genetic and epigenetic alterations leading to cancer and discuss the main challenges in the field.
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74
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Haggerty TJ, Dunn IS, Rose LB, Newton EE, Pandolfi F, Kurnick JT. Heat shock protein-90 inhibitors enhance antigen expression on melanomas and increase T cell recognition of tumor cells. PLoS One 2014; 9:e114506. [PMID: 25503774 PMCID: PMC4264751 DOI: 10.1371/journal.pone.0114506] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 11/10/2014] [Indexed: 12/23/2022] Open
Abstract
In an effort to enhance antigen-specific T cell recognition of cancer cells, we have examined numerous modulators of antigen-expression. In this report we demonstrate that twelve different Hsp90 inhibitors (iHsp90) share the ability to increase the expression of differentiation antigens and MHC Class I antigens. These iHsp90 are active in several molecular and cellular assays on a series of tumor cell lines, including eleven human melanomas, a murine B16 melanoma, and two human glioma-derived cell lines. Intra-cytoplasmic antibody staining showed that all of the tested iHsp90 increased expression of the melanocyte differentiation antigens Melan-A/MART-1, gp100, and TRP-2, as well as MHC Class I. The gliomas showed enhanced gp100 and MHC staining. Quantitative analysis of mRNA levels showed a parallel increase in message transcription, and a reporter assay shows induction of promoter activity for Melan-A/MART-1 gene. In addition, iHsp90 increased recognition of tumor cells by T cells specific for Melan-A/MART-1. In contrast to direct Hsp90 client proteins, the increased levels of full-length differentiation antigens that result from iHsp90 treatment are most likely the result of transcriptional activation of their encoding genes. In combination, these results suggest that iHsp90 improve recognition of tumor cells by T cells specific for a melanoma-associated antigen as a result of increasing the expressed intracellular antigen pool available for processing and presentation by MHC Class I, along with increased levels of MHC Class I itself. As these Hsp90 inhibitors do not interfere with T cell function, they could have potential for use in immunotherapy of cancer.
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Affiliation(s)
- Timothy J. Haggerty
- CytoCure LLC, Suite 430C, 100 Cummings Center, Beverly, MA, United States of America
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States of America
| | - Ian S. Dunn
- CytoCure LLC, Suite 430C, 100 Cummings Center, Beverly, MA, United States of America
| | - Lenora B. Rose
- CytoCure LLC, Suite 430C, 100 Cummings Center, Beverly, MA, United States of America
| | - Estelle E. Newton
- CytoCure LLC, Suite 430C, 100 Cummings Center, Beverly, MA, United States of America
| | - Franco Pandolfi
- Department of Internal Medicine, Catholic University, Rome, Italy
- * E-mail:
| | - James T. Kurnick
- CytoCure LLC, Suite 430C, 100 Cummings Center, Beverly, MA, United States of America
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States of America
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75
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Cai MJ, Li XR, Pei XY, Liu W, Wang JX, Zhao XF. Heat shock protein 90 maintains the stability and function of transcription factor Broad Z7 by interacting with its Broad-Complex-Tramtrack-Bric-a-brac domain. INSECT MOLECULAR BIOLOGY 2014; 23:720-732. [PMID: 25060629 DOI: 10.1111/imb.12118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Heat shock protein 90 (Hsp90) is a highly conserved chaperone protein that interacts with various client proteins to mediate their folding and stability. The Broad-Complex-Tramtrack-Bric-a-brac (BTB) domain, also known as poxvirus and zinc finger (POZ) domain, exists widely in different proteins and is highly conserved. However, the stability mechanism of BTB domain-containing proteins has not been fully understood. Co-immunoprecipitation and a protein pull-down assay were performed to investigate the interaction between Hsp90 and the transcription factor Broad isoform Z7 (BrZ7) in vivo and in vitro. The middle domain of Hsp90 directly associated with the BTB domain of BrZ7. The Hsp90 inhibitor 17-(Allylamino)-17-demethoxygeldanamycin (17-AAG) interrupted the interaction between Hsp90 and BrZ7 and decreased the protein level of BrZ7 but did not affect the mRNA level of BrZ7. The addition of the proteasome inhibitor peptide aldehyde Cbz-leu-leu leucinal suppressed the 17-AAG-induced degradation of BrZ7. BTB domain deletion and 17-AAG treatment resulted in inhibition of BrZ7 function in gene expression in the 20-hydroxyecdysone and juvenile hormone pathways. These results reveal that the middle domain of Hsp90 associates with the BTB domain of BrZ7 to prevent BrZ7 degradation and maintain BrZ7 function in gene expression in the lepidopteran insect Helicoverpa armigera.
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Affiliation(s)
- M-J Cai
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Science, Shandong University, Jinan, China
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76
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Yokoyama Y, Ohtaki A, Jantan I, Yohda M, Nakamoto H. Goniothalamin enhances the ATPase activity of the molecular chaperone Hsp90 but inhibits its chaperone activity. J Biochem 2014; 157:161-8. [PMID: 25294885 DOI: 10.1093/jb/mvu061] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Hsp90 is an ATP-dependent molecular chaperone that is involved in important cellular pathways such as signal transduction pathways. It is a potential cancer drug target because it plays a critical role for stabilization and activation of oncoproteins. Thus, small molecule compounds that control the Hsp90 function are useful to elucidate potential lead compounds against cancer. We studied effect of a naturally occurring styryl-lactone goniothalamin on the activity of Hsp90. Although many drugs targeting Hsp90 inhibit the ATPase activity of Hsp90, goniothalamin enhanced rather than inhibited the ATPase activity of a cyanobacterial Hsp90 (HtpG) and a yeast Hsp90. It increased both K(m) and k(cat) of the Hsp90s. Domain competition assays and tryptophan fluorescence measurements with various truncated derivatives of HtpG indicated that goniothalamin binds to the N-terminal domain of HtpG. Goniothalamin did not influence on the interaction of HtpG with a non-native protein or the anti-aggregation activity of HtpG significantly. However, it inhibited the activity of HtpG that assists refolding of a non-native protein in cooperation with the Hsp70 chaperone system. This is the first report to show that a small molecule that binds to the N-terminal domain of Hsp90 activates its ATPase activity, while inhibiting the chaperone function of Hsp90.
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Affiliation(s)
- Yuhei Yokoyama
- Molecular Biology Course, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan; Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia; and Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Aguru Ohtaki
- Molecular Biology Course, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan; Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia; and Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Ibrahim Jantan
- Molecular Biology Course, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan; Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia; and Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Masafumi Yohda
- Molecular Biology Course, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan; Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia; and Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Hitoshi Nakamoto
- Molecular Biology Course, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan; Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia; and Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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77
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Franco MC, Estévez AG. Tyrosine nitration as mediator of cell death. Cell Mol Life Sci 2014; 71:3939-50. [PMID: 24947321 PMCID: PMC11113622 DOI: 10.1007/s00018-014-1662-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 05/21/2014] [Accepted: 06/02/2014] [Indexed: 01/04/2023]
Abstract
Nitrotyrosine is used as a marker for the production of peroxynitrite and other reactive nitrogen species. For over 20 years the presence of nitrotyrosine was associated with cell death in multiple pathologies. Filling the gap between correlation and causality has proven to be a difficult task. Here, we discuss the evidence supporting tyrosine nitration as a specific posttranslational modification participating in the induction of cell death signaling pathways.
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Affiliation(s)
- María C. Franco
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827 USA
| | - Alvaro G. Estévez
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827 USA
- 6900 Lake Nona Blvd, Orlando, FL 32827 USA
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78
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Lee CR, Anderson JT, Mitchell-Olds T. Unifying genetic canalization, genetic constraint, and genotype-by-environment interaction: QTL by genomic background by environment interaction of flowering time in Boechera stricta. PLoS Genet 2014; 10:e1004727. [PMID: 25340779 PMCID: PMC4207664 DOI: 10.1371/journal.pgen.1004727] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 09/02/2014] [Indexed: 01/01/2023] Open
Abstract
Natural populations exhibit substantial variation in quantitative traits. A quantitative trait is typically defined by its mean and variance, and to date most genetic mapping studies focus on loci altering trait means but not (co)variances. For single traits, the control of trait variance across genetic backgrounds is referred to as genetic canalization. With multiple traits, the genetic covariance among different traits in the same environment indicates the magnitude of potential genetic constraint, while genotype-by-environment interaction (GxE) concerns the same trait across different environments. While some have suggested that these three attributes of quantitative traits are different views of similar concepts, it is not yet clear, however, whether they have the same underlying genetic mechanism. Here, we detect quantitative trait loci (QTL) influencing the (co)variance of phenological traits in six distinct environments in Boechera stricta, a close relative of Arabidopsis. We identified nFT as the QTL altering the magnitude of phenological trait canalization, genetic constraint, and GxE. Both the magnitude and direction of nFT's canalization effects depend on the environment, and to our knowledge, this reversibility of canalization across environments has not been reported previously. nFT's effects on trait covariance structure (genetic constraint and GxE) likely result from the variable and reversible canalization effects across different traits and environments, which can be explained by the interaction among nFT, genomic backgrounds, and environmental stimuli. This view is supported by experiments demonstrating significant nFT by genomic background epistatic interactions affecting phenological traits and expression of the candidate gene, FT. In contrast to the well-known canalization gene Hsp90, the case of nFT may exemplify an alternative mechanism: Our results suggest that (at least in traits with major signal integrators such as flowering time) genetic canalization, genetic constraint, and GxE may have related genetic mechanisms resulting from interactions among major QTL, genomic backgrounds, and environments.
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Affiliation(s)
- Cheng-Ruei Lee
- Department of Biology, Duke University, Durham, North Carolina, United States of America
| | - Jill T. Anderson
- Department of Biological Sciences, Environment and Sustainability Program, University of South Carolina, Columbia, South Carolina, United States of America
| | - Thomas Mitchell-Olds
- Department of Biology, Duke University, Durham, North Carolina, United States of America
- Institute for Genome Sciences and Policy, Duke University, Durham, North Carolina, United States of America
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79
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Wang SH, Cheng CY, Chen CJ, Chen HH, Tang PC, Chen CF, Lee YP, Huang SY. Changes in protein expression in testes of L2 strain Taiwan country chickens in response to acute heat stress. Theriogenology 2014; 82:80-94. [DOI: 10.1016/j.theriogenology.2014.03.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 03/04/2014] [Accepted: 03/08/2014] [Indexed: 01/16/2023]
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80
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Abstract
This review highlights studies conducted in murine models to evaluate the efficacy of compounds targeting Heat shock protein (Hsp) 90 of malaria. Both advances achieved and limitations that exist are highlighted.
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81
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A Novel Mechanism for Cross-Adaptation between Heat and Altitude Acclimation: The Role of Heat Shock Protein 90. ACTA ACUST UNITED AC 2014. [DOI: 10.1155/2014/121402] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Heat shock protein 90 (HSP90) is a member of a family of molecular chaperone proteins which can be upregulated by various stressors including heat stress leading to increases in HSP90 protein expression. Its primary functions include (1) renaturing and denaturing of damaged proteins caused by heat stress and (2) interacting with client proteins to induce cell signaling for gene expression. The latter function is of interest because, in cancer cells, HSP90 has been reported to interact with the transcription hypoxic-inducible factor 1α (HIF1α). In a normoxic environment, HIF1α is degraded and therefore has limited physiological function. In contrast, in a hypoxic environment, stabilized HIF1α acts to promote erythropoiesis and angiogenesis. Since HSP90 interacts with HIF1α, and HSP90 can be upregulated from heat acclimation in humans, we present a proposal that heat acclimation can mimic molecular adaptations to those of altitude exposure. Specifically, we propose that heat acclimation increases HSP90 which then stabilizes HIF1α in a normoxic environment. This has many implications since HIF1α regulates red blood cell and vasculature formation. In this paper we will discuss (1) the functional roles of HSP90 and HIF1α, (2) the interaction between HSP90 and other client proteins including HIF1α, and (3) results from in vitro studies that may suggest how the relationship between HSP90 and HIF1α might be applied to individuals preparing to make altitude sojourns.
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82
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Mattoo RUH, Goloubinoff P. Molecular chaperones are nanomachines that catalytically unfold misfolded and alternatively folded proteins. Cell Mol Life Sci 2014; 71:3311-25. [PMID: 24760129 PMCID: PMC4131146 DOI: 10.1007/s00018-014-1627-y] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 04/04/2014] [Accepted: 04/07/2014] [Indexed: 01/01/2023]
Abstract
By virtue of their general ability to bind (hold) translocating or unfolding polypeptides otherwise doomed to aggregate, molecular chaperones are commonly dubbed “holdases”. Yet, chaperones also carry physiological functions that do not necessitate prevention of aggregation, such as altering the native states of proteins, as in the disassembly of SNARE complexes and clathrin coats. To carry such physiological functions, major members of the Hsp70, Hsp110, Hsp100, and Hsp60/CCT chaperone families act as catalytic unfolding enzymes or unfoldases that drive iterative cycles of protein binding, unfolding/pulling, and release. One unfoldase chaperone may thus successively convert many misfolded or alternatively folded polypeptide substrates into transiently unfolded intermediates, which, once released, can spontaneously refold into low-affinity native products. Whereas during stress, a large excess of non-catalytic chaperones in holding mode may optimally prevent protein aggregation, after the stress, catalytic disaggregases and unfoldases may act as nanomachines that use the energy of ATP hydrolysis to repair proteins with compromised conformations. Thus, holding and catalytic unfolding chaperones can act as primary cellular defenses against the formation of early misfolded and aggregated proteotoxic conformers in order to avert or retard the onset of degenerative protein conformational diseases.
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Affiliation(s)
- Rayees U H Mattoo
- Department of Plant Molecular Biology, Faculty of Biology and Medicine, University of Lausanne, Biophore Building, 1015, Lausanne, Switzerland
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83
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Ciglia E, Vergin J, Reimann S, Smits SHJ, Schmitt L, Groth G, Gohlke H. Resolving hot spots in the C-terminal dimerization domain that determine the stability of the molecular chaperone Hsp90. PLoS One 2014; 9:e96031. [PMID: 24760083 PMCID: PMC3997499 DOI: 10.1371/journal.pone.0096031] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 04/02/2014] [Indexed: 12/24/2022] Open
Abstract
Human heat shock protein of 90 kDa (hHsp90) is a homodimer that has an essential role in facilitating malignant transformation at the molecular level. Inhibiting hHsp90 function is a validated approach for treating different types of tumors. Inhibiting the dimerization of hHsp90 via its C-terminal domain (CTD) should provide a novel way to therapeutically interfere with hHsp90 function. Here, we predicted hot spot residues that cluster in the CTD dimerization interface by a structural decomposition of the effective energy of binding computed by the MM-GBSA approach and confirmed these predictions using in silico alanine scanning with DrugScore(PPI). Mutation of these residues to alanine caused a significant decrease in the melting temperature according to differential scanning fluorimetry experiments, indicating a reduced stability of the mutant hHsp90 complexes. Size exclusion chromatography and multi-angle light scattering studies demonstrate that the reduced stability of the mutant hHsp90 correlates with a lower complex stoichiometry due to the disruption of the dimerization interface. These results suggest that the identified hot spot residues can be used as a pharmacophoric template for identifying and designing small-molecule inhibitors of hHsp90 dimerization.
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Affiliation(s)
- Emanuele Ciglia
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich-Heine-University, Düsseldorf, Germany
| | - Janina Vergin
- Institute for Biochemical Plant Physiology, Heinrich-Heine-University, Düsseldorf, Germany
| | - Sven Reimann
- Institute of Biochemistry, Heinrich-Heine-University, Düsseldorf, Germany
| | - Sander H. J. Smits
- Institute of Biochemistry, Heinrich-Heine-University, Düsseldorf, Germany
| | - Lutz Schmitt
- Institute of Biochemistry, Heinrich-Heine-University, Düsseldorf, Germany
| | - Georg Groth
- Institute for Biochemical Plant Physiology, Heinrich-Heine-University, Düsseldorf, Germany
| | - Holger Gohlke
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich-Heine-University, Düsseldorf, Germany
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84
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Freudenreich A, Nick P. Microtubular Organization in Tobacco Cells: Heat-Shock Protein 90 can Bind to Tubulinin Vitro. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1998.tb00708.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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85
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Kurganov BI. Antiaggregation activity of chaperones and its quantification. BIOCHEMISTRY (MOSCOW) 2014; 78:1554-66. [DOI: 10.1134/s0006297913130129] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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86
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Nakamoto H, Fujita K, Ohtaki A, Watanabe S, Narumi S, Maruyama T, Suenaga E, Misono TS, Kumar PKR, Goloubinoff P, Yoshikawa H. Physical interaction between bacterial heat shock protein (Hsp) 90 and Hsp70 chaperones mediates their cooperative action to refold denatured proteins. J Biol Chem 2014; 289:6110-9. [PMID: 24415765 DOI: 10.1074/jbc.m113.524801] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In eukaryotes, heat shock protein 90 (Hsp90) is an essential ATP-dependent molecular chaperone that associates with numerous client proteins. HtpG, a prokaryotic homolog of Hsp90, is essential for thermotolerance in cyanobacteria, and in vitro it suppresses the aggregation of denatured proteins efficiently. Understanding how the non-native client proteins bound to HtpG refold is of central importance to comprehend the essential role of HtpG under stress. Here, we demonstrate by yeast two-hybrid method, immunoprecipitation assays, and surface plasmon resonance techniques that HtpG physically interacts with DnaJ2 and DnaK2. DnaJ2, which belongs to the type II J-protein family, bound DnaK2 or HtpG with submicromolar affinity, and HtpG bound DnaK2 with micromolar affinity. Not only DnaJ2 but also HtpG enhanced the ATP hydrolysis by DnaK2. Although assisted by the DnaK2 chaperone system, HtpG enhanced native refolding of urea-denatured lactate dehydrogenase and heat-denatured glucose-6-phosphate dehydrogenase. HtpG did not substitute for DnaJ2 or GrpE in the DnaK2-assisted refolding of the denatured substrates. The heat-denatured malate dehydrogenase that did not refold by the assistance of the DnaK2 chaperone system alone was trapped by HtpG first and then transferred to DnaK2 where it refolded. Dissociation of substrates from HtpG was either ATP-dependent or -independent depending on the substrate, indicating the presence of two mechanisms of cooperative action between the HtpG and the DnaK2 chaperone system.
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87
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Segawa T, Fujii Y, Tanaka A, Bando SI, Okayasu R, Ohnishi K, Kubota N. Radiosensitization of human lung cancer cells by the novel purine-scaffold Hsp90 inhibitor, PU-H71. Int J Mol Med 2013; 33:559-64. [PMID: 24366006 DOI: 10.3892/ijmm.2013.1594] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 12/13/2013] [Indexed: 11/05/2022] Open
Abstract
The molecular chaperone heat shock protein 90 (Hsp90) is involved in the maturation and stabilization of a wide range of oncogenic client proteins for oncogenesis and malignant cell proliferation, which renders this protein a promising target in the development of cancer therapeutics. PU-H71 is a purine-scaffold Hsp90 inhibitor with less toxicity in normal cells than in cancer cells. In this study, we examined the in vitro radiosensitizing activity and molecular mechanisms of action of PU-H71 in human lung cancer cell lines. PU-H71 enhanced the sensitivity of the SQ-5 and A549 cancer cells to radiation. When the cancer cells were pre-treated with PU-H71, the repair of DNA double-strand breaks (DSBs) was markedly inhibited after irradiation compared with the cells that were not pre-treated with PU-H71, as evaluated by counting the foci of phosphorylated histone H2AX (γ-H2AX). We further demonstrated that post-irradiation, PU-H71 inhibited Rad51 foci formation, a critical protein for the homologous recombination pathway of DNA DSB repair. These data indicate that targeting Hsp90 with PU-H71 may be novel therapeutic strategy for radioresistant carcinomas.
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Affiliation(s)
- Tatsuya Segawa
- Department of Radiological Sciences, Center for Humanity and Arts, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394, Japan
| | - Yoshihiro Fujii
- Department of Radiological Sciences, Center for Humanity and Arts, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394, Japan
| | - Aya Tanaka
- Department of Radiological Sciences, Center for Humanity and Arts, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394, Japan
| | - Shin-Ichi Bando
- Department of Biology, Center for Humanity and Arts, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394, Japan
| | - Ryuichi Okayasu
- Heavy-ion Radiobiology Group, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Inage-ku, Chiba 263-8555, Japan
| | - Ken Ohnishi
- Department of Biology, Center for Humanity and Arts, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394, Japan
| | - Nobuo Kubota
- Department of Radiological Sciences, Center for Humanity and Arts, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394, Japan
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88
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Kim SW, Ko YG, Byun M, Do YJ, Han JY, Kim DH, Seong HH, Kim H. Comparison of Vitrification and Slow Freezing for the Cryopreservation of Chicken Primordial Germ Cell (Ogye). JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2013. [DOI: 10.5187/jast.2013.55.5.417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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89
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Molecular characterization of a heat inducible rice gene, OsHSP1, and implications for rice thermotolerance. Genes Genomics 2013. [DOI: 10.1007/s13258-013-0152-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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90
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Shahinas D, Folefoc A, Taldone T, Chiosis G, Crandall I, Pillai DR. A purine analog synergizes with chloroquine (CQ) by targeting Plasmodium falciparum Hsp90 (PfHsp90). PLoS One 2013; 8:e75446. [PMID: 24098696 PMCID: PMC3787104 DOI: 10.1371/journal.pone.0075446] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 08/18/2013] [Indexed: 12/31/2022] Open
Abstract
Background Drug resistance, absence of an effective vaccine, and inadequate public health measures are major impediments to controlling Plasmodium falciparum malaria worldwide. The development of antimalarials to which resistance is less likely is paramount. To this end, we have exploited the chaperone function of P. falciparum Hsp90 (PfHsp90) that serves to facilitate the expression of resistance determinants. Methods The affinity and activity of a purine analogue Hsp90 inhibitor (PU-H71) on PfHsp90 was determined using surface plasmon resonance (SPR) studies and an ATPase activity assay, respectively. In vitro, antimalarial activity was quantified using flow cytometry. Interactors of PfHsp90 were determined by LC-MS/MS. In vivo studies were conducted using the Plasmodium berghei infection mouse model. Results PU-H71 exhibited antimalarial activity in the nanomolar range, displayed synergistic activity with chloroquine in vitro. Affinity studies reveal that the PfHsp90 interacts either directly or indirectly with the P. falciparum chloroquine resistance transporter (PfCRT) responsible for chloroquine resistance. PU-H71 synergized with chloroquine in the P.berghei mouse model of malaria to reduce parasitemia and improve survival. Conclusions We propose that the interaction of PfHsp90 with PfCRT may account for the observed antimalarial synergy and that PU-H71 is an effective adjunct for combination therapy.
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Affiliation(s)
- Dea Shahinas
- Department of Laboratory Medicine & Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Asongna Folefoc
- Department of Pathology & Laboratory Medicine and Medicine, The University of Calgary, Calgary, Alberta, Canada
| | - Tony Taldone
- Memorial Sloan-Kettering Cancer Center New York, New York, United States of America
| | - Gabriela Chiosis
- Memorial Sloan-Kettering Cancer Center New York, New York, United States of America
| | - Ian Crandall
- Department of Laboratory Medicine & Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Dylan R. Pillai
- Department of Pathology & Laboratory Medicine and Medicine, The University of Calgary, Calgary, Alberta, Canada
- Department of Microbiology, Immunology, and Infectious Diseases, The University of Calgary, Calgary, Alberta, Canada
- * E-mail:
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91
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Wei T, Gao Y, Wang R, Xu T. A heat shock protein 90 β isoform involved in immune response to bacteria challenge and heat shock from Miichthys miiuy. FISH & SHELLFISH IMMUNOLOGY 2013; 35:429-37. [PMID: 23684810 DOI: 10.1016/j.fsi.2013.04.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 04/08/2013] [Accepted: 04/29/2013] [Indexed: 05/26/2023]
Abstract
Heat shock protein 90 (HSP90) is highly conserved molecular chaperone that plays a critical role in cellular stress response. In this study, we reported the identification and functional analysis of a heat shock protein 90 gene from miiuy croaker (designated Mimi-HSP90). Mimi-HSP90 contained five conserved HSP90 protein family signatures and shared 89.6%-99.5% similarity with other known HSP90 β isoform. Homology analysis and structure comparison further indicated that Mimi-HSP90 should be β isoform member of the HSP90 family. The molecular evolutionary analysis showed that HSP90 was under an overall strong purifying select pressure among fish species. Mimi-HSP90 gene was constitutively expressed in ten examined tissues, and the expression level of liver was higher than in other tissues. The expression level of Mimi-HSP90 gene under bacterial infection and heat shock were analyzed by real-time quantitative RT-PCR, resulted in significant changes in liver, spleen, and kidney tissues. The purified recombinant pET-HSP90 protein was used to produce the polyclonal antibody in mice. The specificity of the antibody was determined by Western blot analysis. All results suggested that Mimi-HSP90 was involved in thermal stress and immune response in miiuy croaker.
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Affiliation(s)
- Tao Wei
- Laboratory for Marine Living Resources and Molecular Engineering, College of Marine Science, Zhejiang Ocean University, 105 Wenhua Road, Zhoushan 316000, PR China
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Identification of HSP90 as potential biomarker of biliary atresia using two-dimensional electrophoresis and mass spectrometry. PLoS One 2013; 8:e68602. [PMID: 23874684 PMCID: PMC3708914 DOI: 10.1371/journal.pone.0068602] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Accepted: 05/31/2013] [Indexed: 12/26/2022] Open
Abstract
Biliary atresia (BA) is a devastating cholestatic liver disease targeting infants. Current diagnosis depends on surgical exploration of the biliary tree. The aim of the present study was to identify potential biomarkers for the diagnosis of biliary atresia (BA). Two-dimensional electrophoresis was utilized for the identification of proteins that were differentially expressed in liver biopsies of 20 BA patients and 12 infants with non-BA neonatal cholestasis (NC) as controls. Using mass spectrometry, we identified 15 proteins with expressions significantly altered. Out of the 15 proteins identified, heat shock protein (HSP) 90 was the most significantly altered and was down-regulated in BA samples compared to NC samples using immunoblotting analysis. Our findings suggest that HSP90 might be a potential biomarker for the diagnosis of BA and may be used for monitoring further development and therapy for BA. This study demonstrated that a comprehensive strategy of proteomic identification combined with further validation should be adopted in biomarker discovery.
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93
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Chaari A, Hoarau-Véchot J, Ladjimi M. Applying chaperones to protein-misfolding disorders: molecular chaperones against α-synuclein in Parkinson's disease. Int J Biol Macromol 2013; 60:196-205. [PMID: 23748003 DOI: 10.1016/j.ijbiomac.2013.05.032] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Revised: 05/28/2013] [Accepted: 05/29/2013] [Indexed: 02/04/2023]
Abstract
Parkinson's disease (PD) is a neurodegenerative disorder characterized by the accumulation of a protein called α-synuclein (α-syn) into inclusions known as lewy bodies (LB) within neurons. This accumulation is also due to insufficient formation and activity of dopamine produced in certain neurons within the substantia nigra. Lewy bodies are the pathological hallmark of the idiopathic disorder and the cascade that allows α-synuclein to misfold, aggregate and form these inclusions has been the subject of intensive research. Targeting these early steps of oligomerization is one of the main therapeutic approaches in order to develop neurodegenerative-modifying agents. Because the folding and refolding of alpha synuclein is the key point of this cascade, we are interested in this review to summarize the role of some molecular chaperones proteins such as Hsp70, Hsp90 and small heat shock proteins (sHsp) and Hsp 104. Hsp70 and its co-chaperone, Hsp70 and small heat shock proteins can prevent neurodegeneration by preventing α-syn misfolding, oligomerization and aggregation in vitro and in Parkinson disease animal models. Hsp104 is able to resolve disordered protein aggregates and cross beta amyloid conformers. Together, these chaperones have a complementary effect and can be a target for therapeutic intervention in PD.
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Affiliation(s)
- Ali Chaari
- Department of Biochemistry, Weill Cornell Medical College in Qatar, Qatar Foundation, Education City, Doha, Qatar.
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Ishida M, Tomomari T, Kanzaki T, Abe T, Oka T, Yohda M. Biochemical characterization and cooperation with co-chaperones of heat shock protein 90 from Schizosaccharomyces pombe. J Biosci Bioeng 2013; 116:444-8. [PMID: 23664927 DOI: 10.1016/j.jbiosc.2013.04.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 04/02/2013] [Accepted: 04/15/2013] [Indexed: 10/26/2022]
Abstract
The characterization of Hsp90 from the fission yeast Schizosaccharomyces pombe was performed. Hsp90 of S. pombe existed as a dimer and exhibited ATP-dependent conformational changes. It captured unfolded proteins in the ATP-free open conformation and protected them from thermal aggregation. Hsp90 of S. pombe was also able to refold thermally denatured firefly luciferase. The co-chaperones Sti1 and Aha1 bound Hsp90 and modulated its activity. Because the affinity of Sti1 was higher than that of Aha1, the effect of Sti1 appeared to dominate when both co-chaperones existed simultaneously.
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Affiliation(s)
- Mari Ishida
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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95
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Abstract
Oxidative stress is a widely recognized cause of cell death associated with neurodegeneration, inflammation, and aging. Tyrosine nitration in these conditions has been reported extensively, but whether tyrosine nitration is a marker or plays a role in the cell-death processes was unknown. Here, we show that nitration of a single tyrosine residue on a small proportion of 90-kDa heat-shock protein (Hsp90), is sufficient to induce motor neuron death by the P2X7 receptor-dependent activation of the Fas pathway. Nitrotyrosine at position 33 or 56 stimulates a toxic gain of function that turns Hsp90 into a toxic protein. Using an antibody that recognizes the nitrated Hsp90, we found immunoreactivity in motor neurons of patients with amyotrophic lateral sclerosis, in an animal model of amyotrophic lateral sclerosis, and after experimental spinal cord injury. Our findings reveal that cell death can be triggered by nitration of a single protein and highlight nitrated Hsp90 as a potential target for the development of effective therapies for a large number of pathologies.
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96
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Barrott JJ, Haystead TAJ. Hsp90, an unlikely ally in the war on cancer. FEBS J 2013; 280:1381-96. [PMID: 23356585 PMCID: PMC3815692 DOI: 10.1111/febs.12147] [Citation(s) in RCA: 147] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 01/10/2013] [Accepted: 01/22/2013] [Indexed: 12/25/2022]
Abstract
On the surface heat shock protein 90 (Hsp90) is an unlikely drug target for the treatment of any disease, let alone cancer. Hsp90 is highly conserved and ubiquitously expressed in all cells. There are two major isoforms α and β encoded by distinct genes and together they may constitute 1%-3% of the cellular protein. Deletion of the protein is embryonic lethal and there are no recognized polymorphisms suggesting an association or causal relationship with any human disease. With respect to cancer, the proteins absence from two recent high profile articles, 'Hallmarks of cancer: the next generation' [Hanahan & Weinberg (2011) Cell 144, 646-674] and 'Comprehensive molecular portraits of human breast tumours' [Koboldt et al. (2012) Nature] underlines the perception that it is an unlikely bona fide target to treat this disease. Yet, to date, there are 17 distinct Hsp90 inhibitors in clinical trials for multiple indications in cancer. The protein has been championed for over 20 years by the National Cancer Institute (Bethesda, MD, USA) as a cancer target since the discovery of the antitumor activity of the natural product geldanamycin. This review aims to look at the conundrum of why Hsp90 can even be considered a druggable target for the treatment of cancer. We propose that in contrast to the majority of chemotherapeutics our growing armamentarium of investigational Hsp90 drugs represents an elegant choice that offers real hope in the long-term treatment of certain cancers.
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Affiliation(s)
- Jared J Barrott
- Department of Pharmacology and Cancer Biology, Duke University, Durham, NC 27710, USA
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97
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McConnell JR, McAlpine SR. Heat shock proteins 27, 40, and 70 as combinational and dual therapeutic cancer targets. Bioorg Med Chem Lett 2013; 23:1923-8. [PMID: 23453837 DOI: 10.1016/j.bmcl.2013.02.014] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 01/28/2013] [Accepted: 02/04/2013] [Indexed: 12/23/2022]
Abstract
The heat shock proteins are essential players in the development of cancer and they are prime therapeutic targets. Targeting multiple hsps in dual therapies decreases the likelihood of drug resistance compared to utilizing mono-therapies. Further, employing an hsp inhibitor in combination with another therapy has proven clinically successful. Examples of efficacious strategies include the inhibition of hsp27, which prevents protein aggregation, controlling hsp40's role as an ATPase modulator, and inhibiting hsp70 from acting as a molecular chaperone. While hsp40 therapies are just in the beginning stages, hsp27 and hsp70 therapies have been successfully used in dual inhibition treatments with hsp90 inhibitors and in combinational therapy with antineoplastic drugs. Both dual and combinatorial therapies show encouraging results when used in treating chemotherapeutically resistant diseases.
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Affiliation(s)
- Jeanette R McConnell
- Department of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
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98
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In silico investigations on HSP90 and its inhibition for the therapeutic prevention of breast cancer. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.jopr.2013.02.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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99
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Petro EJ, Raben DM. Bacterial expression strategies for several Sus scrofa diacylglycerol kinase alpha constructs: solubility challenges. Sci Rep 2013; 3:1609. [PMID: 23558375 PMCID: PMC3617429 DOI: 10.1038/srep01609] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 03/19/2013] [Indexed: 01/27/2023] Open
Abstract
We pursued several strategies for expressing either full-length Sus scrofa diacylglycerol kinase (DGK) alpha or the catalytic domain (alphacat) in Escherichia coli. Alphacat could be extracted, refolded, and purified from inclusion bodies, but when subjected to analytical gel filtration chromatography, it elutes in the void volume, in what we conclude are microscopic aggregates unsuitable for x-ray crystallography. Adding glutathione S-transferase, thioredoxin, or maltose binding protein as N-terminal fusion tags did not improve alphacat's solubility. Coexpressing with bacterial chaperones increased the yield of alphacat in the supernatant after high-speed centrifugation, but the protein still elutes in the void upon analytical gel filtration chromatography. We believe our work will be of interest to those interested in the structure of eukaryotic DGKs, so that they know which expression strategies have already been tried, as well as to those interested in protein folding and those interested in chaperone/target-protein interactions.
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Affiliation(s)
- Elizabeth J. Petro
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Daniel M. Raben
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD
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100
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Histone deacetylase inhibitors increase glucocerebrosidase activity in Gaucher disease by modulation of molecular chaperones. Proc Natl Acad Sci U S A 2012; 110:966-71. [PMID: 23277556 DOI: 10.1073/pnas.1221046110] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Gaucher disease is caused by mutations of the GBA gene that encodes the lysosomal enzyme glucocerebrosidase (GCase). GBA mutations often result in protein misfolding and premature degradation, but usually exert less effect on catalytic activity. In this study, we identified the molecular mechanism by which histone deacetylase inhibitors increase the quantity and activity of GCase. Specifically, these inhibitors limit the deacetylation of heat shock protein 90, resulting in less recognition of the mutant peptide and GCase degradation. These findings provide insight into a possible therapeutic strategy for Gaucher disease and other genetic disorders by modifying molecular chaperone and protein degradation pathways.
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