351
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Silva KT, Oliveira-Castro RA, Rodrigues VC, de Lima WG, Rodrigues CV, Castro-Borges W, Andrade MHG. DBT- and DBTO2-Induced Dysplasia and Their Associated Proteomic Alterations in the Small Intestines of Wistar Rats. J Proteome Res 2014; 14:385-96. [DOI: 10.1021/pr5009459] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Karina Taciana Silva
- Núcleo
de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, Minas Gerais, Brasil
| | - Renata Alves Oliveira-Castro
- Núcleo
de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, Minas Gerais, Brasil
| | | | - Wanderson Geraldo de Lima
- Departamento
de Ciências Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, Minas Gerais, Brasil
| | - Cibele Velloso Rodrigues
- Departamento
de Biologia, Universidade Federal de Juiz de Fora, Campus Avançado, Governador Valadares, Minas Gerais, Brasil
| | - William Castro-Borges
- Departamento
de Ciências Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, Minas Gerais, Brasil
| | - Milton Hércules Guerra Andrade
- Departamento
de Ciências Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, Minas Gerais, Brasil
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352
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Heat shock protein 70 in Alzheimer's disease. BIOMED RESEARCH INTERNATIONAL 2014; 2014:435203. [PMID: 25431764 PMCID: PMC4241292 DOI: 10.1155/2014/435203] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 08/16/2014] [Accepted: 09/07/2014] [Indexed: 12/31/2022]
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disease that caused dementia which has no effective treatment. Growing evidence has demonstrated that AD is a “protein misfolding disorder” that exhibits common features of misfolded, aggregation-prone proteins and selective cell loss in the mature nervous system. Heat shock protein 70 (HSP70) attracts extensive attention worldwide, because it plays a crucial role in preventing protein misfolding and inhibiting aggregation and represents a class of proteins potentially involved in AD pathogenesis. Numerous studies have indicated that HSP70 could suppress the progression of AD with in vitro and in vivo experiments. Thus, targeting HSP70 and the related compounds might represent a promising strategy for the treatment of AD.
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353
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Hao YB, Yi SY, Ruan J, Zhao L, Nan KJ. New insights into metronomic chemotherapy-induced immunoregulation. Cancer Lett 2014; 354:220-6. [DOI: 10.1016/j.canlet.2014.08.028] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 08/17/2014] [Accepted: 08/20/2014] [Indexed: 12/15/2022]
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354
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Taldone T, Ochiana SO, Patel PD, Chiosis G. Selective targeting of the stress chaperome as a therapeutic strategy. Trends Pharmacol Sci 2014; 35:592-603. [PMID: 25262919 DOI: 10.1016/j.tips.2014.09.001] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 08/28/2014] [Accepted: 09/02/2014] [Indexed: 12/11/2022]
Abstract
Normal cellular function is maintained by coordinated proteome machinery that performs a vast array of activities. Helping the proteome in such roles is the chaperome, a network of molecular chaperones and folding enzymes. The stressed cell contains, at any time, a complex mixture of chaperome complexes; a majority performs 'housekeeping functions' similarly to non-stressed, normal cells, but a finely-tuned fraction buffers the proteome altered by chronic stress. The stress chaperome is epigenetically distinct from its normal, housekeeping counterpart, providing a basis for its selective targeting by small molecules. We discuss here the development of chaperome inhibitors, and how agents targeting chaperome members in stressed cells are in fact being directed towards chaperome complexes, and their effect is therefore determined by their ability to sample and engage such complexes. A new approach is needed to target and implement chaperome modulators in the investigation of diseases, and we propose that the classical thinking in drug discovery needs adjustment when developing chaperome-targeting drugs.
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Affiliation(s)
- Tony Taldone
- Program in Molecular Pharmacology and Chemistry and Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Stefan O Ochiana
- Program in Molecular Pharmacology and Chemistry and Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Pallav D Patel
- Program in Molecular Pharmacology and Chemistry and Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Gabriela Chiosis
- Program in Molecular Pharmacology and Chemistry and Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
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355
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Roles of microRNA-1 in hypoxia-induced apoptotic insults to neuronal cells. Arch Toxicol 2014; 90:191-202. [DOI: 10.1007/s00204-014-1364-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 09/04/2014] [Indexed: 12/11/2022]
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356
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Heat shock protein 70 as a predictive marker for platinum-based adjuvant chemotherapy in patients with resected non-small cell lung cancer. Lung Cancer 2014; 86:262-7. [PMID: 25261232 DOI: 10.1016/j.lungcan.2014.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 07/31/2014] [Accepted: 08/14/2014] [Indexed: 11/22/2022]
Abstract
OBJECTIVES Although adjuvant platinum-based chemotherapy improves survival in completely resected non-small cell lung cancer (NSCLC), its effect is limited. We evaluated whether the expression of heat shock protein 70 (Hsp70) is associated with clinical outcomes in patients with completely resected NSCLC who were treated with or without adjuvant platinum-based chemotherapy. PATIENTS AND METHODS Patients who underwent curative resection for NSCLC and diagnosed as stage IIA through IIIA were included. Immunohistochemical staining for Hsp70 was performed on surgical specimens and survival rates were compared by Hsp70 expression and adjuvant platinum-based chemotherapy. RESULTS Of 327 enrolled patients, Hsp70 expression was positive in 220 (67.3%). For patients who did not receive adjuvant chemotherapy, Hsp70 expression did not significantly affect survival. However, for patients who received adjuvant chemotherapy, those with Hsp70-positive tumors had a longer disease-free survival outcome than cases with Hsp70-negative tumors (not reached vs. 27.3 months; P=0.002), although there was no significant difference in overall survival (97.0 vs. 58.9 months, P=0.080). In the adjuvant chemotherapy group, multivariate modeling showed that patients with Hsp70-postitive tumors had a lower risk of recurrence and death after adjusting for age, sex, performance status, pathologic stage, and histological type (disease-free survival: adjusted hazard ratio, 0.537; 95% CI, 0.362-0.796; P=0.002; overall survival: adjusted hazard ratio, 0.663; 95% CI, 0.419-1.051; P=0.080). CONCLUSION Hsp70 is a positive predictive factor in completely resected NSCLC with received platinum-based adjuvant chemotherapy.
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357
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Scheithauer H, Belka C, Lauber K, Gaipl US. Immunological aspects of radiotherapy. Radiat Oncol 2014; 9:185. [PMID: 25142149 PMCID: PMC4150945 DOI: 10.1186/1748-717x-9-185] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 08/12/2014] [Indexed: 01/01/2023] Open
Affiliation(s)
| | | | - Kirsten Lauber
- Department of Radiotherapy and Radiation Oncology, Ludwig Maximilian University Munich, D-81377 Munich, Germany.
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358
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Rodina A, Taldone T, Kang Y, Patel PD, Koren J, Yan P, DaGama Gomes EM, Yang C, Patel MR, Shrestha L, Ochiana SO, Santarossa C, Maharaj R, Gozman A, Cox MB, Erdjument-Bromage H, Hendrickson RC, Cerchietti L, Melnick A, Guzman ML, Chiosis G. Affinity purification probes of potential use to investigate the endogenous Hsp70 interactome in cancer. ACS Chem Biol 2014; 9:1698-705. [PMID: 24934503 PMCID: PMC4134716 DOI: 10.1021/cb500256u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 06/11/2014] [Indexed: 01/08/2023]
Abstract
Heat shock protein 70 (Hsp70) is a family of proteins with key roles in regulating malignancy. Cancer cells rely on Hsp70 to inhibit apoptosis, regulate senescence and autophagy, and maintain the stability of numerous onco-proteins. Despite these important biological functions in cancer, robust chemical tools that enable the analysis of the Hsp70-regulated proteome in a tumor-by-tumor manner are yet unavailable. Here we take advantage of a recently reported Hsp70 ligand to design and develop an affinity purification chemical toolset for potential use in the investigation of the endogenous Hsp70-interacting proteome in cancer. We demonstrate that these tools lock Hsp70 in complex with onco-client proteins and effectively isolate Hsp70 complexes for identification through biochemical techniques. Using these tools we provide proof-of-concept analyses that glimpse into the complex roles played by Hsp70 in maintaining a multitude of cell-specific malignancy-driving proteins.
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Affiliation(s)
- Anna Rodina
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Tony Taldone
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Yanlong Kang
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Pallav D. Patel
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - John Koren
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Pengrong Yan
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Erica M. DaGama Gomes
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Chenghua Yang
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Maulik R. Patel
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Liza Shrestha
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Stefan O. Ochiana
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Cristina Santarossa
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Ronnie Maharaj
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Alexander Gozman
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Marc B. Cox
- Department of Biological Sciences, University
of Texas, El Paso, Texas 79968, United
States
| | - Hediye Erdjument-Bromage
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Ronald C. Hendrickson
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
| | - Leandro Cerchietti
- Department of Medicine, Division of Hematology and Medical
Oncology, and Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Ari Melnick
- Department of Medicine, Division of Hematology and Medical
Oncology, and Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Monica L. Guzman
- Department of Medicine, Division of Hematology and Medical
Oncology, and Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065, United States
| | - Gabriela Chiosis
- Program in Molecular Pharmacology
and Chemistry and Department of Medicine and Program in Molecular Biology, Proteomics
Core, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, United States
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359
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Kim JH, Alderson TR, Frederick RO, Markley JL. Nucleotide-dependent interactions within a specialized Hsp70/Hsp40 complex involved in Fe-S cluster biogenesis. J Am Chem Soc 2014; 136:11586-9. [PMID: 25080945 PMCID: PMC4140450 DOI: 10.1021/ja5055252] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The
structural mechanism by which Hsp70-type chaperones interact
with Hsp40-type co-chaperones has been of great interest, yet still
remains a matter of debate. Here, we used solution NMR spectroscopy
to investigate the ATP-/ADP-dependent interactions between Escherichia coli HscA and HscB, the specialized Hsp70/Hsp40
molecular chaperones that mediate iron–sulfur cluster transfer.
We observed that NMR signals assigned to amino acid residues in the
J-domain and its “HPD” motif of HscB broadened severely
upon the addition of ATP-bound HscA, but these signals were not similarly
broadened by ADP-bound HscA or the isolated nucleotide binding domain
of HscA complexed with either ATP or ADP. An HscB variant with an
altered HPD motif, HscB(H32A,P33A,D34A), failed to manifest WT-like
NMR signal perturbations and also abolished WT-like stimulation of
ATP hydrolysis by HscA. In addition, residues 153–171 in the
C-terminal region of HscB exhibited NMR signal perturbations upon
interaction with HscA, alone or complexed with ADP or ATP. These results
demonstrate that the HPD motif in the J-domain of HscB directly interacts
with ATP-bound HscA and suggest that a second, less nucleotide-dependent
binding site for HscA resides in the C-terminal region of HscB.
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Affiliation(s)
- Jin Hae Kim
- Mitochondrial Protein Partnership, Center for Eukaryotic Structural Genomics, and ‡Department of Biochemistry, University of Wisconsin , Madison, Wisconsin 53706, United States
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360
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Rogon C, Ulbricht A, Hesse M, Alberti S, Vijayaraj P, Best D, Adams IR, Magin TM, Fleischmann BK, Höhfeld J. HSP70-binding protein HSPBP1 regulates chaperone expression at a posttranslational level and is essential for spermatogenesis. Mol Biol Cell 2014; 25:2260-71. [PMID: 24899640 PMCID: PMC4116300 DOI: 10.1091/mbc.e14-02-0742] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 05/12/2014] [Accepted: 05/23/2014] [Indexed: 11/11/2022] Open
Abstract
Molecular chaperones play key roles during growth, development, and stress survival. The ability to induce chaperone expression enables cells to cope with the accumulation of nonnative proteins under stress and complete developmental processes with an increased requirement for chaperone assistance. Here we generate and analyze transgenic mice that lack the cochaperone HSPBP1, a nucleotide-exchange factor of HSP70 proteins and inhibitor of chaperone-assisted protein degradation. Male HSPBP1(-/-) mice are sterile because of impaired meiosis and massive apoptosis of spermatocytes. HSPBP1 deficiency in testes strongly reduces the expression of the inducible, antiapoptotic HSP70 family members HSPA1L and HSPA2, the latter of which is essential for synaptonemal complex disassembly during meiosis. We demonstrate that HSPBP1 affects chaperone expression at a posttranslational level by inhibiting the ubiquitylation and proteasomal degradation of inducible HSP70 proteins. We further provide evidence that the cochaperone BAG2 contributes to HSP70 stabilization in tissues other than testes. Our findings reveal that chaperone expression is determined not only by regulated transcription, but also by controlled degradation, with degradation-inhibiting cochaperones exerting essential prosurvival functions.
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Affiliation(s)
- Christian Rogon
- Institut für Zellbiologie and Bonner Forum Biomedizin, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53121 Bonn, Germany
| | - Anna Ulbricht
- Institut für Zellbiologie and Bonner Forum Biomedizin, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53121 Bonn, Germany
| | - Michael Hesse
- Institut für Physiologie I, Life and Brain Centre, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53105 Bonn, Germany
| | - Simon Alberti
- Institut für Zellbiologie and Bonner Forum Biomedizin, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53121 Bonn, Germany
| | - Preethi Vijayaraj
- Abteilung für Zellbiochemie, Institut für Biochemie und Molekularbiologie, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53115 Bonn, Germany
| | - Diana Best
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh EH4 2XU, United Kingdom
| | - Ian R Adams
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh EH4 2XU, United Kingdom
| | - Thomas M Magin
- Abteilung für Zellbiochemie, Institut für Biochemie und Molekularbiologie, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53115 Bonn, Germany
| | - Bernd K Fleischmann
- Institut für Physiologie I, Life and Brain Centre, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53105 Bonn, Germany
| | - Jörg Höhfeld
- Institut für Zellbiologie and Bonner Forum Biomedizin, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53121 Bonn, Germany
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361
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Wang X, Li S. Protein mislocalization: mechanisms, functions and clinical applications in cancer. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1846:13-25. [PMID: 24709009 PMCID: PMC4141035 DOI: 10.1016/j.bbcan.2014.03.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 02/20/2014] [Accepted: 03/27/2014] [Indexed: 12/21/2022]
Abstract
The changes from normal cells to cancer cells are primarily regulated by genome instability, which foster hallmark functions of cancer through multiple mechanisms including protein mislocalization. Mislocalization of these proteins, including oncoproteins, tumor suppressors, and other cancer-related proteins, can interfere with normal cellular function and cooperatively drive tumor development and metastasis. This review describes the cancer-related effects of protein subcellular mislocalization, the related mislocalization mechanisms, and the potential application of this knowledge to cancer diagnosis, prognosis, and therapy.
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Affiliation(s)
- Xiaohong Wang
- Department of Pediatrics, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA
| | - Shulin Li
- Department of Pediatrics, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA.
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362
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Zhang P, Leu JIJ, Murphy ME, George DL, Marmorstein R. Crystal structure of the stress-inducible human heat shock protein 70 substrate-binding domain in complex with peptide substrate. PLoS One 2014; 9:e103518. [PMID: 25058147 PMCID: PMC4110032 DOI: 10.1371/journal.pone.0103518] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 07/03/2014] [Indexed: 11/18/2022] Open
Abstract
The HSP70 family of molecular chaperones function to maintain protein quality control and homeostasis. The major stress-induced form, HSP70 (also called HSP72 or HSPA1A) is considered an important anti-cancer drug target because it is constitutively overexpressed in a number of human cancers and promotes cancer cell survival. All HSP70 family members contain two functional domains: an N-terminal nucleotide binding domain (NBD) and a C-terminal protein substrate-binding domain (SBD); the latter is subdivided into SBDα and SBDβ subdomains. The NBD and SBD structures of the bacterial ortholog, DnaK, have been characterized, but only the isolated NBD and SBDα segments of eukaryotic HSP70 proteins have been determined. Here we report the crystal structure of the substrate-bound human HSP70-SBD to 2 angstrom resolution. The overall fold of this SBD is similar to the corresponding domain in the substrate-bound DnaK structures, confirming a similar overall architecture of the orthologous bacterial and human HSP70 proteins. However, conformational differences are observed in the peptide-HSP70-SBD complex, particularly in the loop Lα, β that bridges SBDα to SBDβ, and the loop LL,1 that connects the SBD and NBD. The interaction between the SBDα and SBDβ subdomains and the mode of substrate recognition is also different between DnaK and HSP70. This suggests that differences may exist in how different HSP70 proteins recognize their respective substrates. The high-resolution structure of the substrate-bound-HSP70-SBD complex provides a molecular platform for the rational design of small molecule compounds that preferentially target this C-terminal domain, in order to modulate human HSP70 function.
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Affiliation(s)
- Pingfeng Zhang
- Program in Gene Expression and Regulation, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Department of Biochemistry & Biophysics, Abramson Family Cancer Research Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Julia I-Ju Leu
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail: (JI-JL) (JL); (RM) (RM)
| | - Maureen E. Murphy
- Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
| | - Donna L. George
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Ronen Marmorstein
- Program in Gene Expression and Regulation, The Wistar Institute, Philadelphia, Pennsylvania, United States of America
- Department of Biochemistry & Biophysics, Abramson Family Cancer Research Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail: (JI-JL) (JL); (RM) (RM)
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363
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Abstract
SIGNIFICANCE Quiescin sulfhydryl oxidase 1 (QSOX1) is an enzyme that oxidizes thiols during protein folding, reducing molecular oxygen to hydrogen peroxide. Tumor cells may take advantage of oxidative environments at different stages of tumorigenesis, but QSOX1 may also serve additional functions in tumors. RECENT ADVANCES Several groups have reported the over-expression of QSOX1 in breast, pancreas, and prostate cancers. A consensus is building that QSOX1 over-expression is important during tumor cell invasion, facilitating tumor cell migration at the tumor-stroma interface. As such, QSOX1 may be considered a prognostic indicator of metastatic potential or even indicate that cancer is present in a host. CRITICAL ISSUES However, some controversy exists between QSOX1 as a marker of poor or favorable outcome in breast cancer. More studies are required to reveal what advantage QSOX1 provides to breast and other types of cancer. More specifically, it is critical to learn which tumor types over-express QSOX1 and use its enzymatic activity to their advantage. FUTURE DIRECTIONS As interest increases in understanding the mechanisms of tumorigenesis within the extracellular matrix and how tumor cells influence fibroblasts and other stromal cells, QSOX1 may be revealed as an important player in cancer detection and prognosis. Defining the mechanism(s) of QSOX1 activity in tumors and in in vivo models will provide important insights into how to target QSOX1 with anti-neoplastic agents.
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Affiliation(s)
- Douglas F Lake
- 1 School of Life Sciences, ASU/Mayo Clinic , Scottsdale, Arizona
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364
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O'Leary PC, Terrile M, Bajor M, Gaj P, Hennessy BT, Mills GB, Zagozdzon A, O'Connor DP, Brennan DJ, Connor K, Li J, Gonzalez-Angulo AM, Sun HD, Pu JX, Pontén F, Uhlén M, Jirström K, Nowis DA, Crown JP, Zagozdzon R, Gallagher WM. Peroxiredoxin-1 protects estrogen receptor α from oxidative stress-induced suppression and is a protein biomarker of favorable prognosis in breast cancer. Breast Cancer Res 2014; 16:R79. [PMID: 25011585 PMCID: PMC4226972 DOI: 10.1186/bcr3691] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 07/01/2014] [Indexed: 12/17/2022] Open
Abstract
INTRODUCTION Peroxiredoxin-1 (PRDX1) is a multifunctional protein, acting as a hydrogen peroxide (H2O2) scavenger, molecular chaperone and immune modulator. Although differential PRDX1 expression has been described in many tumors, the potential role of PRDX1 in breast cancer remains highly ambiguous. Using a comprehensive antibody-based proteomics approach, we interrogated PRDX1 protein as a putative biomarker in estrogen receptor (ER)-positive breast cancer. METHODS An anti-PRDX1 antibody was validated in breast cancer cell lines using immunoblotting, immunohistochemistry and reverse phase protein array (RPPA) technology. PRDX1 protein expression was evaluated in two independent breast cancer cohorts, represented on a screening RPPA (n = 712) and a validation tissue microarray (n = 498). In vitro assays were performed exploring the functional contribution of PRDX1, with oxidative stress conditions mimicked via treatment with H2O2, peroxynitrite, or adenanthin, a PRDX1/2 inhibitor. RESULTS In ER-positive cases, high PRDX1 protein expression is a biomarker of improved prognosis across both cohorts. In the validation cohort, high PRDX1 expression was an independent predictor of improved relapse-free survival (hazard ratio (HR) = 0.62, 95% confidence interval (CI) = 0.40 to 0.96, P = 0.032), breast cancer-specific survival (HR = 0.44, 95% CI = 0.24 to 0.79, P = 0.006) and overall survival (HR = 0.61, 95% CI = 0.44 to 0.85, P = 0.004). RPPA screening of cancer signaling proteins showed that ERα protein was upregulated in PRDX1 high tumors. Exogenous H2O2 treatment decreased ERα protein levels in ER-positive cells. PRDX1 knockdown further sensitized cells to H2O2- and peroxynitrite-mediated effects, whilst PRDX1 overexpression protected against this response. Inhibition of PRDX1/2 antioxidant activity with adenanthin dramatically reduced ERα levels in breast cancer cells. CONCLUSIONS PRDX1 is shown to be an independent predictor of improved outcomes in ER-positive breast cancer. Through its antioxidant function, PRDX1 may prevent oxidative stress-mediated ERα loss, thereby potentially contributing to maintenance of an ER-positive phenotype in mammary tumors. These results for the first time imply a close connection between biological activity of PRDX1 and regulation of estrogen-mediated signaling in breast cancer.
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365
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Shi J, Yang D, Cong X, Li Y, Yang X, Liu Y. Expression of HSPA12B in acute cardiac allograft rejection in rats. Pathol Res Pract 2014; 211:20-6. [PMID: 25433995 DOI: 10.1016/j.prp.2014.06.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 05/24/2014] [Accepted: 06/19/2014] [Indexed: 01/21/2023]
Abstract
HSP70 may play a more important role in regulating antigen-specific immune response than other HSPs; however, HSPA12B production in transplanted heart remains obscure, which was identified as the newest member of the HSP70 family. In the current study, we performed a heart transplantation model in adult rats and investigated the dynamic changes of HSPA12B expression in the cardiac grafts. The cardiac grafts of allogeneic (Wistar-Lewis rat) and syngeneic (Lewis-Lewis rat) rat models were subjected to histopathological and immunohistochemical analyses for HSPA12B expression on days 0-7 after operation. We also examined the expression profiles of active caspase-3, whose changes were correlated with the expression profiles of HSPA12B. Our results demonstrated that HSPA12B protein exhibited biphasic patterns in transplanted heart. The first expression phase correlated with ischemical reperfusion injury over 2 days post-transplant. The second peak of HSPA12B expression was found only in allografts on day 5, concurrent with the expression of caspase-3. Immunohistochemical assay showed that compared with rare expression in isografts, there were significant protein expressions of HSPA12B and caspase-3 in heart allografts from day 5 to 7 post-transplant. Furthermore, double immunofluorescence staining for active caspase-3 and HSPA12B in isografts and allografts at day 5 post-transplant were analyzed and colocalization of HSPA12B/active caspase-3 was detected in allografts. In conclusion, this is the first description of HSPA12B expression in acute cardiac allograft rejection. Our results suggested that HSPA12B might play crucial roles in heart pathophysiology after transplantation.
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Affiliation(s)
- Jiahai Shi
- Department of Cardiothoracic Surgery, Affiliated Hospital of Nantong University, Medical College of Nantong University, Nantong, Jiangsu 226001, People's Republic of China
| | - Dunpeng Yang
- Department of Cardiothoracic Surgery, Affiliated Hospital of Nantong University, Medical College of Nantong University, Nantong, Jiangsu 226001, People's Republic of China
| | - Xia Cong
- Department of Digestion, Affiliated Hospital of Nantong University, Medical College of Nantong University, Nantong, Jiangsu 226001, People's Republic of China
| | - Yangcheng Li
- Department of Cardiothoracic Surgery, Affiliated Hospital of Nantong University, Medical College of Nantong University, Nantong, Jiangsu 226001, People's Republic of China
| | - Xuechao Yang
- Department of Cardiothoracic Surgery, Affiliated Hospital of Nantong University, Medical College of Nantong University, Nantong, Jiangsu 226001, People's Republic of China
| | - Yonghua Liu
- Department of Pathogen Biology, Medical College, Nantong University, Nantong, Jiangsu 226001, People's Republic of China; Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province 226001, People's Republic of China.
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366
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Lapuk AV, Volik SV, Wang Y, Collins CC. The role of mRNA splicing in prostate cancer. Asian J Androl 2014; 16:515-21. [PMID: 24830689 PMCID: PMC4104073 DOI: 10.4103/1008-682x.127825] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 02/12/2014] [Indexed: 12/23/2022] Open
Abstract
Alternative splicing (AS) is a crucial step in gene expression. It is subject to intricate regulation, and its deregulation in cancer can lead to a wide array of neoplastic phenotypes. A large body of evidence implicates splice isoforms in most if not all hallmarks of cancer, including growth, apoptosis, invasion and metastasis, angiogenesis, and metabolism. AS has important clinical implications since it can be manipulated therapeutically to treat cancer and represents a mechanism of resistance to therapy. In prostate cancer (PCa) AS also plays a prominent role and this review will summarize the current knowledge of alternatively spliced genes with important functional consequences. We will highlight accumulating evidence on AS of the components of the two critical pathways in PCa: androgen receptor (AR) and phosphoinositide 3-kinase (PI3K). These observations together with data on dysregulation of splice factors in PCa suggest that AR and PI3K pathways may be interconnected with previously unappreciated splicing regulatory networks. In addition, we will discuss several lines of evidence implicating splicing regulation in the development of the castration resistance.
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Affiliation(s)
- Anna V Lapuk
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
| | - Stanislav V Volik
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
| | - Yuzhuo Wang
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
- Department of Experimental Therapeutics, BC Cancer Agency, Vancouver, BC, Canada
| | - Colin C Collins
- Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada
- Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
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367
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A minimally invasive method for retrieving single adherent cells of different types from cultures. Sci Rep 2014; 4:5424. [PMID: 24957932 PMCID: PMC4067612 DOI: 10.1038/srep05424] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 06/05/2014] [Indexed: 01/08/2023] Open
Abstract
The field of single-cell analysis has gained a significant momentum over the last decade. Separation and isolation of individual cells is an indispensable step in almost all currently available single-cell analysis technologies. However, stress levels introduced by such manipulations remain largely unstudied. We present a method for minimally invasive retrieval of selected individual adherent cells of different types from cell cultures. The method is based on a combination of mechanical (shear flow) force and biochemical (trypsin digestion) treatment. We quantified alterations in the transcription levels of stress response genes in individual cells exposed to varying levels of shear flow and trypsinization. We report optimal temperature, RNA preservation reagents, shear force and trypsinization conditions necessary to minimize changes in the stress-related gene expression levels. The method and experimental findings are broadly applicable and can be used by a broad research community working in the field of single cell analysis.
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368
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Deschênes-Simard X, Lessard F, Gaumont-Leclerc MF, Bardeesy N, Ferbeyre G. Cellular senescence and protein degradation: breaking down cancer. Cell Cycle 2014; 13:1840-58. [PMID: 24866342 DOI: 10.4161/cc.29335] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Autophagy and the ubiquitin-proteasome pathway (UPP) are the major protein degradation systems in eukaryotic cells. Whereas the former mediate a bulk nonspecific degradation, the UPP allows a rapid degradation of specific proteins. Both systems have been shown to play a role in tumorigenesis, and the interest in developing therapeutic agents inhibiting protein degradation is steadily growing. However, emerging data point to a critical role for autophagy in cellular senescence, an established tumor suppressor mechanism. Recently, a selective protein degradation process mediated by the UPP was also shown to contribute to the senescence phenotype. This process is tightly regulated by E3 ubiquitin ligases, deubiquitinases, and several post-translational modifications of target proteins. Illustrating the complexity of UPP, more than 600 human genes have been shown to encode E3 ubiquitin ligases, a number which exceeds that of the protein kinases. Nevertheless, our knowledge of proteasome-dependent protein degradation as a regulated process in cellular contexts such as cancer and senescence remains very limited. Here we discuss the implications of protein degradation in senescence and attempt to relate this function to the protein degradation pattern observed in cancer cells.
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Affiliation(s)
- Xavier Deschênes-Simard
- Department of Biochemistry and Molecular Medicine; Université de Montréal; Montréal, Québec, Canada
| | - Frédéric Lessard
- Department of Biochemistry and Molecular Medicine; Université de Montréal; Montréal, Québec, Canada
| | | | - Nabeel Bardeesy
- Massachusetts General Hospital Cancer Center; Harvard Medical School; Boston, MA USA
| | - Gerardo Ferbeyre
- Department of Biochemistry and Molecular Medicine; Université de Montréal; Montréal, Québec, Canada
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369
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Zhao C, Ji N, Zhang B, Sun P, Feng W, Wei J, Chang Y. Effects of covering behavior and exposure to a predatory crab Charybdis japonica on survival and HSP70 expression of juvenile sea urchins Strongylocentrotus intermedius. PLoS One 2014; 9:e97840. [PMID: 24837036 PMCID: PMC4024038 DOI: 10.1371/journal.pone.0097840] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Accepted: 04/25/2014] [Indexed: 11/24/2022] Open
Abstract
Predation is a complex process among predator, prey and environment. Juvenile sea urchins are more susceptible to predators than adults, which affects community structure. Behavior is involved in anti-predator responses by changes in the expression of anti-predator responsive genes. Here, we investigated the effects of exposure to a predatory crab Charybdis japonica and covering behavior on survival and HSP70 expression of juvenile sea urchins Strongylocentrotus intermedius. C. japonica consumed large numbers of juvenile S. intermedius in 12 hours with a mortality of 34.17±11.43%. Covering behavior did not significantly reduce predation. Exposure to C. japonica did not significantly upregulate HSP70 expression of juvenile S. intermedius in 12 hours. Covering behavior showed no significant regulative effect on the gene expression of HSP70 of juvenile S. intermedius exposed to C. japonica for 12 hours. The results indicate that the anti-predator function of covering behavior is limited and that HSP70 expression does not appear to play an important role in the anti-predator process of S. intermedius.
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Affiliation(s)
- Chong Zhao
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Nanjing Ji
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
| | - Binglong Zhang
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
| | - Ping Sun
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
| | - Wenping Feng
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
| | - Jing Wei
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
| | - Yaqing Chang
- Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture, Dalian Ocean University, Dalian, China
- * E-mail:
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370
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Laramee CB, Frisch P, McLeod K, Li GC. Elevation of heat shock gene expression from static magnetic field exposure in vitro. Bioelectromagnetics 2014; 35:406-13. [PMID: 24839179 DOI: 10.1002/bem.21857] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Accepted: 03/20/2014] [Indexed: 02/02/2023]
Abstract
Previously, we found that extremely low frequency (ELF) electric fields were able to elicit an approximate 3.5-fold increase in heat shock gene expression, a response which may have applicability to cancer therapy. Based on recent studies demonstrating the ability of magnetic fields to influence gene expression, we hypothesized that low level static magnetic fields may be able to affect heat shock gene expression while avoiding some of the clinical difficulties that arise with electric fields. Transfected rat primary cells in monolayer were exposed to magnetic fields of 1 to 440 mT for 16, 24, or 48 h starting at 24 and 48 h post transfection. Heat shock protein (HSP70) expression, as indicated by a promoter linked luciferase reporter, was followed for up to 96 h and showed a dependence on flux density, exposure duration, and start time post transfection. A nonlinear response was observed for increasing flux density with a maximum of a 3.5-fold increase in expression for 48 h of exposure starting 48 h after transfection. These results demonstrate an enhancement of gene expression similar in magnitude to that observed with external electric field exposure, while eliminating many of the clinical complications.
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Affiliation(s)
- Craig B Laramee
- Biomedical Engineering Program, Department of Bioengineering, Binghamton University, Binghamton, New York
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371
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Hsc70 contributes to cancer cell survival by preventing Rab1A degradation under stress conditions. PLoS One 2014; 9:e96785. [PMID: 24801886 PMCID: PMC4011886 DOI: 10.1371/journal.pone.0096785] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 04/11/2014] [Indexed: 12/20/2022] Open
Abstract
Heat shock cognate protein 70 (Hsc70) acts as a molecular chaperone for the maintenance of intracellular proteins, which allows cancer cells to survive under proteotoxic stress. We attempted to use Hsc70 to identify key molecules in cancer cell survival. Here, we performed mass-spectrometry-based proteomics analysis utilizing affinity purification with anti-Hsc70 antibodies; as a result, 83 differentially expressed proteins were identified under stress conditions. This result implies that there was a change in the proteins with which Hsc70 interacted in response to stress. Among the proteins identified under both serum-depleted and 5-fluorouracil-treated conditions, Rab1A was identified as an essential molecule for cancer cell survival. Hsc70 interacted with Rab1A in a chaperone-dependent manner. In addition, Hsc70 knockdown decreased the level of Rab1A and increased the level of its ubiquitination under stress conditions, suggesting that Hsc70 prevented the degradation of Rab1A denatured by stress exposure. We also found that Rab1A knockdown induced cell death by inhibition of autophagosome formation. Rab1A may therefore contribute to overcoming proteotoxic insults, which allows cancer cells to survive under stress conditions. Analysis of Hsc70 interactors provided insight into changes of intracellular status. We expect further study of the Hsc70 interactome to provide a more comprehensive understanding of cancer cell physiology.
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372
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Gong L, Wang CH, Huang YJ, Liu F, Li T, Dai J, Li AL, Zhou T, Xia Q, Chen L. CUEDC2 interacts with heat shock protein 70 and negatively regulates its chaperone activity. Biochem Biophys Res Commun 2014; 447:64-9. [PMID: 24685480 DOI: 10.1016/j.bbrc.2014.03.102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Accepted: 03/20/2014] [Indexed: 11/19/2022]
Abstract
Recently studies have revealed that CUEDC2, a CUE domain-containing protein, plays critical roles in many biological processes, such as cell cycle, inflammation and tumorigenesis. In this study, to further explore the function of CUEDC2, we performed affinity purification combined with mass spectrometry analysis to identify its interaction proteins, which led to the identification of heat shock protein 70 (HSP70). We confirmed the interaction between CUEDC2 and HSP70 in vivo by co-immunoprecipitation assays. Mapping experiments revealed that CUE domain was required for their binding, while the PBD and CT domains of HSP70, mediated the interaction with CUEDC2. The intracellular Luciferase refolding assay indicated that CUEDC2 could inhibit the chaperone activity of HSP70. Together, our results identify HSP70 as a novel CUEDC2 interaction protein and suggest that CUEDC2 might play important roles in regulating HSP70 mediated stress responses.
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Affiliation(s)
- Lin Gong
- Department of Hepatobiliary Surgery and Hepatobiliary Surgical Institute, Chinese PLA General Hospital, Beijing 100853, China; State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China; Department of Hepatobiliary Surgery, NO.401 Hospital of Chinese PLA, Qingdao 266071, Shandong, China
| | - Chen Hui Wang
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Yi Jiao Huang
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Feng Liu
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Teng Li
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Jiang Dai
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Ai Ling Li
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Tao Zhou
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China
| | - Qing Xia
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China.
| | - Liang Chen
- State Key Laboratory of Proteomics, China National Center of Biomedical Analysis, 27 Tai-Ping Rd., Beijing 100850, China.
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373
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Rebecca VW, Wood E, Fedorenko IV, Paraiso KHT, Haarberg HE, Chen Y, Xiang Y, Sarnaik A, Gibney GT, Sondak VK, Koomen JM, Smalley KSM. Evaluating melanoma drug response and therapeutic escape with quantitative proteomics. Mol Cell Proteomics 2014; 13:1844-54. [PMID: 24760959 DOI: 10.1074/mcp.m113.037424] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The evolution of cancer therapy into complex regimens with multiple drugs requires novel approaches for the development and evaluation of companion biomarkers. Liquid chromatography-multiple reaction monitoring mass spectrometry (LC-MRM) is a versatile platform for biomarker measurement. In this study, we describe the development and use of the LC-MRM platform to study the adaptive signaling responses of melanoma cells to inhibitors of HSP90 (XL888) and MEK (AZD6244). XL888 had good anti-tumor activity against NRAS mutant melanoma cell lines as well as BRAF mutant cells with acquired resistance to BRAF inhibitors both in vitro and in vivo. LC-MRM analysis showed HSP90 inhibition to be associated with decreased expression of multiple receptor tyrosine kinases, modules in the PI3K/AKT/mammalian target of rapamycin pathway, and the MAPK/CDK4 signaling axis in NRAS mutant melanoma cell lines and the inhibition of PI3K/AKT signaling in BRAF mutant melanoma xenografts with acquired vemurafenib resistance. The LC-MRM approach targeting more than 80 cancer signaling proteins was highly sensitive and could be applied to fine needle aspirates from xenografts and clinical melanoma specimens (using 50 μg of total protein). We further showed MEK inhibition to be associated with signaling through the NFκB and WNT signaling pathways, as well as increased receptor tyrosine kinase expression and activation. Validation studies identified PDGF receptor β signaling as a potential escape mechanism from MEK inhibition, which could be overcome through combined use of AZD6244 and the PDGF receptor inhibitor, crenolanib. Together, our studies show LC-MRM to have unique value as a platform for the systems level understanding of the molecular mechanisms of drug response and therapeutic escape. This work provides the proof-of-principle for the future development of LC-MRM assays for monitoring drug responses in the clinic.
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Affiliation(s)
| | | | | | | | | | - Yi Chen
- From the ‡Departments of Molecular Oncology
| | - Yun Xiang
- From the ‡Departments of Molecular Oncology
| | | | | | | | - John M Koomen
- From the ‡Departments of Molecular Oncology, ‖Chemical Biology and Molecular Medicine, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
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374
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Wen W, Liu W, Shao Y, Chen L. VER-155008, a small molecule inhibitor of HSP70 with potent anti-cancer activity on lung cancer cell lines. Exp Biol Med (Maywood) 2014; 239:638-45. [PMID: 24676905 DOI: 10.1177/1535370214527899] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Lung cancer is the most common malignancy and exhibits significant morbidity and mortality worldwide. Among all lung cancer subtypes, non-small-cell lung cancer (NSCLC) accounts for the majority of all lung cancer cases. Although there have been intensive investigations on the underlying mechanism of NSCLC development and progression, the exact molecular basis is not well understood. Further insights on important molecular regulators of lung cancer are needed for development of novel therapeutics. The heat shock protein (HSP) family is a group of molecular chaperones that assist in protein folding, modification, and transportation. Different HSPs are essential for tumor cell survival by binding diverse client proteins and regulating homeostasis. In the current study, we sought to characterize HSP70 and HSP90 as potent regulators of NSCLC growth. Our results indicate that differential expression of HSP70 is associated with the malignant phenotype of NSCLC cell lines and plays an important regulatory role in NSCLC cell proliferation. Moreover, a specific inhibitor of HSP70, VER-155008 significantly inhibits NSCLC proliferation and cell cycle progression. We showed that this effect is largely abolished by HSP70 overexpression, indicating that the inhibitory effect of VER-155008 on cell growth is specifically through HSP70 inhibition. In addition, 17-AAD, an inhibitor of HSP90, exerts a potent synergistic effect on NSCLC proliferation with VER-155008. We also observed that inhibition of HSP70 by VER-155008 can sensitize A549 cells to ionizing radiation. These data provide proof-of-principle that VER-155008 can be a good candidate for NSCLC treatment and HSP machinery is a good target for developing NSCLC therapeutics.
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Affiliation(s)
- Wei Wen
- Department of Thoracic Surgery, People's Hospital of Jiangsu Province, Nanjing Medical University, Nanjing 210029, China
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375
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Singh AK, Roberts S, Ullman B, Madhubala R. A quantitative proteomic screen to identify potential drug resistance mechanism in α-difluoromethylornithine (DFMO) resistant Leishmania donovani. J Proteomics 2014; 102:44-59. [PMID: 24631822 DOI: 10.1016/j.jprot.2014.02.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 02/22/2014] [Accepted: 02/25/2014] [Indexed: 12/13/2022]
Abstract
UNLABELLED Visceral leishmaniasis (VL) caused by Leishmania donovani is a systemic protozoan disease that is fatal if left untreated. The promastigote form of L. donovani is sensitive to growth inhibition by dl-α-difluoromethylornithine (DFMO), an inhibitor of ornithine decarboxylase (ODC), the first enzyme of the polyamine biosynthetic pathway. Exposure of a wild type (DI700) cell population to gradually increasing concentrations of DFMO resulted in the selection of a strain of Leishmania (DFMO-16), which was capable of proliferating in 16mM DFMO. To elucidate the molecular basis for this resistance, we undertook a comparative proteomic analysis of DFMO-resistant/sensitive parasites using isobaric tagging for relative and absolute quantification (iTRAQ/LC-MS/MS). Out of the 101 proteins identified in at least 2 of the 3 independent experiments, 82 proteins are 1.5- to 44.0-fold more abundant in DFMO-resistant strain (DFMO-16) while 19 are 2- to 5.0-fold less abundant as compared to the wild-type (DI700) parasites. Proteins with 2-fold or greater abundance in the DFMO-resistant strain include free radical detoxification, polyamine and trypanothione metabolic proteins, proteins involved in metabolism, intracellular survival and proteolysis, elongation factors, signaling molecules and mitochondrial transporters, and many with no annotated function. Differentially modulated proteins contribute to our understanding of molecular mechanism of DFMO-resistance and have the potential to act as biomarkers. BIOLOGICAL SIGNIFICANCE This study will facilitate a deeper understanding of the phenomenon of acquired drug resistance and possible biomarkers in Leishmania against antiparasitic drug DFMO. Also it will provide information about the metabolic pathways modulated in resistant parasites as an adaptation mechanism to counter drugs. Studies like this are important to safeguard the efficacy of a limited repertoire of anti-parasitic drugs, and to lead the development of new drugs and drug combinations.
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Affiliation(s)
- Alok Kumar Singh
- School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | | | - Buddy Ullman
- Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, USA
| | - Rentala Madhubala
- School of Life Sciences, Jawaharlal Nehru University, New Delhi, India.
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376
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Valmonte GR, Arthur K, Higgins CM, MacDiarmid RM. Calcium-dependent protein kinases in plants: evolution, expression and function. PLANT & CELL PHYSIOLOGY 2014; 55:551-69. [PMID: 24363288 DOI: 10.1093/pcp/pct200] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Calcium-dependent protein kinases (CPKs) are plant proteins that directly bind calcium ions before phosphorylating substrates involved in metabolism, osmosis, hormone response and stress signaling pathways. CPKs are a large multigene family of proteins that are present in all plants studied to date, as well as in protists, oomycetes and green algae, but are not found in animals and fungi. Despite the increasing evidence of the importance of CPKs in developmental and stress responses from various plants, a comprehensive genome-wide analysis of CPKs from algae to higher plants has not been undertaken. This paper describes the evolution of CPKs from green algae to plants using a broadly sampled phylogenetic analysis and demonstrates the functional diversification of CPKs based on expression and functional studies in different plant species. Our findings reveal that CPK sequence diversification into four major groups occurred in parallel with the terrestrial transition of plants. Despite significant expansion of the CPK gene family during evolution from green algae to higher plants, there is a high level of sequence conservation among CPKs in all plant species. This sequence conservation results in very little correlation between CPK evolutionary groupings and functional diversity, making the search for CPK functional orthologs a challenge.
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Affiliation(s)
- Gardette R Valmonte
- Institute for Applied Ecology New Zealand, School of Applied Sciences, Auckland University of Technology, New Zealand
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377
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Ito T, Maeda T, Goto K, Miura T, Wakame K, Nishioka H, Sato A. Enzyme-treated asparagus extract promotes expression of heat shock protein and exerts antistress effects. J Food Sci 2014; 79:H413-9. [PMID: 24498968 DOI: 10.1111/1750-3841.12371] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 01/03/2014] [Indexed: 11/29/2022]
Abstract
A novel enzyme-treated asparagus extract (ETAS) has been developed as a functional material produced from asparagus stem. Studies were conducted to determine the effect of ETAS on heat shock protein 70 (HSP70) expression and alleviation of stress. HeLa cells were treated with ETAS, and HSP70 mRNA and protein levels were measured using a reverse transcription-polymerase chain reaction (RT-PCR) assay and an enzyme-linked immunosorbent assay (ELISA), respectively. ETAS showed significant increases in HSP70 mRNA at more than 0.125 mg/mL and the protein at more than 1.0 mg/mL. The antistress effect was evaluated in a murine sleep-deprivation model. A sleep-deprivation stress load resulted in elevation of blood corticosterone and lipid peroxide concentrations, while supplementation with ETAS at 200 and 1000 mg/kg body weight was associated with significantly reduced levels of both stress markers, which were in the normal range. The HSP70 protein expression level in mice subjected to sleep-deprivation stress and supplemented with ETAS was significantly enhanced in stomach, liver, and kidney, compared to ETAS-untreated mice. A preliminary and small-sized human study was conducted among healthy volunteers consuming up to 150 mg/d of ETAS daily for 7 d. The mRNA expression of HSP70 in peripheral leukocytes was significantly elevated at intakes of 100 or 150 mg/d, compared to their baseline levels. Since HSP70 is known to be a stress-related protein and its induction leads to cytoprotection, the present results suggest that ETAS might exert antistress effects under stressful conditions, resulting from enhancement of HSP70 expression.
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Affiliation(s)
- Tomohiro Ito
- Amino Up Chemical Co., Ltd, 363-22 Shin-ei, Kiyota, Sapporo 004-0839, Japan
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378
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Kim BK, Kim BR, Lee HJ, Lee SA, Kim BJ, Kim H, Won YS, Shon WJ, Lee NR, Inn KS, Kim BJ. Tumor-suppressive effect of a telomerase-derived peptide by inhibiting hypoxia-induced HIF-1α-VEGF signaling axis. Biomaterials 2014; 35:2924-33. [PMID: 24411674 DOI: 10.1016/j.biomaterials.2013.12.077] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 12/20/2013] [Indexed: 01/13/2023]
Abstract
A reverse-transcriptase-subunit of telomerase (hTERT) derived peptide, GV1001, has been developed as a vaccine against various cancers. Previously, we have shown that GV1001 interacts with heat shock proteins (HSPs) and penetrates cell membranes to be localized in the cytoplasm. In this study, we have found that GV1001 lowered the level of intracellular and surface HSPs of various cancer cells. In hypoxic conditions, GV1001 treatment of cancer cells resulted in decreases of HSP90, HSP70, and HIF-1α. Subsequently, proliferation of cancer cells and synthesis of VEGF were significantly reduced by treatment using GV1001 in hypoxic conditions. In an experiment using a nude mouse xenograft model, GV1001 exerted a similar tumor suppressive effect, further confirming its anti-tumor efficacy. Higher apoptotic cell death, reduced proliferation of cells, and fewer blood vessels were observed in GV1001-treated tumors compared to control. In addition, significant reduction of Tie2+ CD11b+ monocytes, which were recruited by VEGF from tumor cells and play a critical role in angiogenesis, was observed in GV1001-treated tumors. Collectively, the results suggest that GV1001 possesses potential therapeutic efficacy in addition to its ability to induce anti-cancer immune responses by suppressing both HSP70 and HSP90.
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Affiliation(s)
- Bu-Kyung Kim
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Bo-Ram Kim
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Hyun-Joo Lee
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Seoung-Ae Lee
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Byoung-Jun Kim
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Hong Kim
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Yu-Sub Won
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea
| | - Won-Jun Shon
- Department of Conservative Dentistry, Dental Research Institute and School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Na-Rae Lee
- Department of Pharmaceutical Science, College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Kyung-Soo Inn
- Department of Pharmaceutical Science, College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
| | - Bum-Joon Kim
- Department of Microbiology and Immunology, Liver Research Institute, Cancer Research Institute and SNUMRC, College of Medicine, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Republic of Korea.
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379
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Przybyla BD, Shafirstein G, Vishal SJ, Dennis RA, Griffin RJ. Molecular changes in bone marrow, tumor and serum after conductive ablation of murine 4T1 breast carcinoma. Int J Oncol 2013; 44:600-8. [PMID: 24270800 PMCID: PMC3898720 DOI: 10.3892/ijo.2013.2185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 10/23/2013] [Indexed: 11/06/2022] Open
Abstract
Thermal ablation of solid tumors using conductive interstitial thermal therapy (CITT) produces coagulative necrosis in the center of ablation. Local changes in homeostasis for surviving tumor and systemic changes in circulation and distant organs must be understood and monitored in order to prevent tumor re-growth and metastasis. The purpose of this study was to use a mouse carcinoma model to evaluate molecular changes in the bone marrow and surviving tumor after CITT treatment by quantification of transcripts associated with cancer progression and hyperthermia, serum cytokines, stress proteins and the marrow/tumor cross-talk regulator stromal-derived factor 1. Analysis of 27 genes and 22 proteins with quantitative PCR, ELISA, immunoblotting and multiplex antibody assays revealed that the gene and protein expression in tissue and serum was significantly different between ablated and control mice. The transcripts of four genes (Cxcl12, Sele, Fgf2, Lifr) were significantly higher in the bone marrow of treated mice. Tumors surviving ablation showed significantly lower levels of the Lifr and Sele transcripts. Similarly, the majority of transcripts measured in tumors decreased with treatment. Surviving tumors also contained lower levels of SDF-1α and HIF-1α proteins whereas HSP27 and HSP70 were higher. Of 16 serum chemokines, IFNγ and GM-CSF levels were lower with treatment. These results indicate that CITT ablation causes molecular changes which may slow cancer cell proliferation. However, inhibition of HSP27 may be necessary to control aggressiveness of surviving cancer stem cells. The changes in bone marrow are suggestive of possible increased recruitment of circulatory cancer cells. Therefore, the possibility of heightened bone metastasis after thermal ablation needs to be further investigated and inhibition strategies developed, if warranted.
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Affiliation(s)
- Beata D Przybyla
- Department of Radiation Oncology, University of Arkansas for Medical Science, Little Rock, AR, USA
| | - Gal Shafirstein
- Department of Cell Stress Biology and Otolaryngology, Roswell Park Cancer Institute, Buffalo, NY, USA
| | - Sagar J Vishal
- College of Medicine, University of Arkansas for Medical Science, Little Rock, AR, USA
| | - Richard A Dennis
- Geriatric Research Education and Clinical Center, Central Arkansas Veteran Healthcare System, Little Rock, AR, USA
| | - Robert J Griffin
- Department of Radiation Oncology, University of Arkansas for Medical Science, Little Rock, AR, USA
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380
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Gallardo M, Barrio S, Fernandez M, Paradela A, Arenas A, Toldos O, Ayala R, Albizua E, Jimenez A, Redondo S, Garcia-Martin RM, Gilsanz F, Albar JP, Martinez-Lopez J. Proteomic analysis reveals heat shock protein 70 has a key role in polycythemia Vera. Mol Cancer 2013; 12:142. [PMID: 24252366 PMCID: PMC4225507 DOI: 10.1186/1476-4598-12-142] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 11/15/2013] [Indexed: 01/07/2023] Open
Abstract
JAK-STAT signaling through the JAK2V617F mutation is central to the pathogenesis of myeloproliferative neoplasms (MPN). However, other events could precede the JAK2 mutation. The aim of this study is to analyze the phenotypic divergence between polycytemia vera (PV) and essential thrombocytemia (ET) to find novel therapeutics targets by a proteomic and functional approach to identify alternative routes to JAK2 activation. Through 2D-DIGE and mass spectrometry of granulocyte protein from 20 MPN samples, showed differential expression of HSP70 in PV and ET besides other 60 proteins. Immunohistochemistry of 46 MPN bone marrow samples confirmed HSP70 expression. The median of positive granulocytes was 80% in PV (SD 35%) vs. 23% in ET (SD 34.25%). In an ex vivo model KNK437 was used as an inhibition model assay of HSP70, showed dose-dependent inhibition of cell growth and burst formation unit erythroid (BFU-E) in PV and ET, increased apoptosis in the erythroid lineage, and decreased pJAK2 signaling, as well as a specific siRNA for HSP70. These data suggest a key role for HSP70 in proliferation and survival of the erythroid lineage in PV, and may represent a potential therapeutic target in MPN, especially in PV.
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Affiliation(s)
- Miguel Gallardo
- Hematology Service, Hospital Universitario 12 de Octubre, Avenida, Córdoba, s/n, 28041, Madrid, Spain.
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381
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Sekihara K, Harashima N, Tongu M, Tamaki Y, Uchida N, Inomata T, Harada M. Pifithrin-μ, an inhibitor of heat-shock protein 70, can increase the antitumor effects of hyperthermia against human prostate cancer cells. PLoS One 2013; 8:e78772. [PMID: 24244355 PMCID: PMC3828328 DOI: 10.1371/journal.pone.0078772] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 09/16/2013] [Indexed: 12/12/2022] Open
Abstract
Hyperthermia (HT) improves the efficacy of anti-cancer radiotherapy and chemotherapy. However, HT also inevitably evokes stress responses and increases the expression of heat-shock proteins (HSPs) in cancer cells. Among the HSPs, HSP70 is known as a pro-survival protein. In this study, we investigated the sensitizing effect of pifithrin (PFT)-μ, a small molecule inhibitor of HSP70, when three human prostate cancer cell lines (LNCaP, PC-3, and DU-145) were treated with HT (43°C for 2 h). All cell lines constitutively expressed HSP70, and HT further increased its expression in LNCaP and DU-145. Knockdown of HSP70 with RNA interference decreased the viability and colony-forming ability of cancer cells. PFT-μ decreased the viabilities of all cell lines at one-tenth the dose of Quercetin, a well-known HSP inhibitor. The combination therapy with suboptimal doses of PFT-μ and HT decreased the viability of cancer cells most effectively when PFT-μ was added immediately before HT, and this combination effect was abolished by pre-knockdown of HSP70, suggesting that the effect was mediated via HSP70 inhibition. The combination therapy induced cell death, partially caspase-dependent, and decreased proliferating cancer cells, with decreased expression of c-Myc and cyclin D1 and increased expression of p21WAF1/Cip, indicating arrest of cell growth. Additionally, the combination therapy significantly decreased the colony-forming ability of cancer cells compared to therapy with either alone. Furthermore, in a xenograft mouse model, the combination therapy significantly inhibited PC-3 tumor growth. These findings suggest that PFT-μ can effectively enhance HT-induced antitumor effects via HSP70 inhibition by inducing cell death and arrest of cell growth, and that PFT-μ is a promising agent for use in combination with HT to treat prostate cancer.
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Affiliation(s)
- Kazumasa Sekihara
- Department of Immunology, Shimane University Faculty of Medicine, Shimane, Japan
- Department of Radiation Oncology, Shimane University Faculty of Medicine, Shimane, Japan
| | - Nanae Harashima
- Department of Immunology, Shimane University Faculty of Medicine, Shimane, Japan
| | - Miki Tongu
- Department of Experimental Animals, Center for Integrated Research in Science, Shimane University, Izumo, Shimane, Japan
| | - Yukihisa Tamaki
- Department of Radiation Oncology, Shimane University Faculty of Medicine, Shimane, Japan
| | - Nobue Uchida
- Department of Radiation Oncology, Tottori Prefectural Central Hospital, Tottori, Japan
| | - Taisuke Inomata
- Department of Radiation Oncology, Shimane University Faculty of Medicine, Shimane, Japan
| | - Mamoru Harada
- Department of Immunology, Shimane University Faculty of Medicine, Shimane, Japan
- * E-mail:
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382
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Budina-Kolomets A, Balaburski GM, Bondar A, Beeharry N, Yen T, Murphy ME. Comparison of the activity of three different HSP70 inhibitors on apoptosis, cell cycle arrest, autophagy inhibition, and HSP90 inhibition. Cancer Biol Ther 2013; 15:194-9. [PMID: 24100579 DOI: 10.4161/cbt.26720] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The chaperone HSP70 promotes the survival of cells exposed to many different types of stresses, and is also potently anti-apoptotic. The major stress-induced form of this protein, HSP70-1, is overexpressed in a number of human cancers, yet is negligibly expressed in normal cells. Silencing of the gene encoding HSP70-1 (HSPA1A) is cytotoxic to transformed but not normal cells. Therefore, HSP70 is considered to be a promising cancer drug target, and there has been active interest in the identification and characterization of HSP70 inhibitors for cancer therapy. Because HSP70 behaves in a relatively non-specific manner in the control of protein folding, to date there are no reliably-identified "clients" of this protein, nor is there consensus as to what the phenotypic effects of HSP70 inhibitors are on a cancer cell. Here for the first time we compare three recently-identified HSP70 inhibitors, PES-Cl, MKT-077, and Ver-155008, for their ability to impact some of the known and reported functions of this chaperone; specifically, the ability to inhibit autophagy, to influence the level of HSP90 client proteins, to induce cell cycle arrest, and to inhibit the enzymatic activity of the anaphase-promoting complex/cyclosome (APC/C). We report that all three of these compounds can inhibit autophagy and cause reduced levels of HSP90 client proteins; however, only PES-Cl can inhibit the APC/C and induce G 2/M arrest. Possible reasons for these differences, and the implications for the further development of these prototype compounds as anti-cancer agents, are discussed.
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Affiliation(s)
- Anna Budina-Kolomets
- Program in Molecular and Cellular Oncogenesis; The Wistar Institute; Philadelphia PA USA
| | - Gregor M Balaburski
- Program in Molecular and Cellular Oncogenesis; The Wistar Institute; Philadelphia PA USA
| | - Anastasia Bondar
- Program in Molecular and Cellular Oncogenesis; The Wistar Institute; Philadelphia PA USA
| | - Neil Beeharry
- Institute for Cancer Research; Fox Chase Cancer Center; Philadelphia PA USA
| | - Tim Yen
- Institute for Cancer Research; Fox Chase Cancer Center; Philadelphia PA USA
| | - Maureen E Murphy
- Program in Molecular and Cellular Oncogenesis; The Wistar Institute; Philadelphia PA USA
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383
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La ketamina mejora la supervivencia en ratas con quemaduras severas vía la expresión de la proteína de choque térmico 70, ¿cerca o lejos de la perspectiva clínica? COLOMBIAN JOURNAL OF ANESTHESIOLOGY 2013. [DOI: 10.1016/j.rca.2013.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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384
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Dueñas Z. Ketamine improves survival in severe burn injury in rats via the expression of heat shock protein 70, far or close to the clinical perspective? COLOMBIAN JOURNAL OF ANESTHESIOLOGY 2013. [DOI: 10.1016/j.rcae.2013.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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385
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Ketamine improves survival in severe burn injury in rats via the expression of heat shock protein 70, far or close to the clinical perspective?☆. COLOMBIAN JOURNAL OF ANESTHESIOLOGY 2013. [DOI: 10.1097/01819236-201341040-00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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