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Esfahanian N, Nelson M, Autenried R, Pattison JS, Callegari E, Rezvani K. Comprehensive Analysis of Proteasomal Complexes in Mouse Brain Regions Detects ENO2 as a Potential Partner of the Proteasome in the Striatum. Cell Mol Neurobiol 2022; 42:2305-2319. [PMID: 34037901 PMCID: PMC8617079 DOI: 10.1007/s10571-021-01106-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 05/19/2021] [Indexed: 11/28/2022]
Abstract
Defects in the activity of the proteasome or its regulators are linked to several pathologies, including neurodegenerative diseases. We hypothesize that proteasome heterogeneity and its selective partners vary across brain regions and have a significant impact on proteasomal catalytic activities. Using neuronal cell cultures and brain tissues obtained from mice, we compared proteasomal activities from two distinct brain regions affected in neurodegenerative diseases, the striatum and the hippocampus. The results indicated that proteasome activities and their responses to proteasome inhibitors are determined by their subcellular localizations and their brain regions. Using an iodixanol gradient fractionation method, proteasome complexes were isolated, followed by proteomic analysis for proteasomal interaction partners. Proteomic results revealed brain region-specific non-proteasomal partners, including gamma-enolase (ENO2). ENO2 showed more association to proteasome complexes purified from the striatum than to those from the hippocampus. These results highlight a potential key role for non-proteasomal partners of proteasomes regarding the diverse activities of the proteasome complex recorded in several brain regions.
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Affiliation(s)
- Niki Esfahanian
- Division of Basic Biomedical Sciences, Sanford School of Medicine,, University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD, 57069, USA
| | - Morgan Nelson
- Division of Basic Biomedical Sciences, Sanford School of Medicine,, University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD, 57069, USA
| | - Rebecca Autenried
- Division of Basic Biomedical Sciences, Sanford School of Medicine,, University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD, 57069, USA
| | - J Scott Pattison
- Division of Basic Biomedical Sciences, Sanford School of Medicine,, University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD, 57069, USA
| | - Eduardo Callegari
- Division of Basic Biomedical Sciences, Sanford School of Medicine,, University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD, 57069, USA
| | - Khosrow Rezvani
- Division of Basic Biomedical Sciences, Sanford School of Medicine,, University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD, 57069, USA.
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2
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Suresh R, Diaz RJ. The remodelling of actin composition as a hallmark of cancer. Transl Oncol 2021; 14:101051. [PMID: 33761369 PMCID: PMC8008238 DOI: 10.1016/j.tranon.2021.101051] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/01/2021] [Accepted: 02/17/2021] [Indexed: 02/06/2023] Open
Abstract
Actin is a key structural protein that makes up the cytoskeleton of cells, and plays a role in functions such as division, migration, and vesicle trafficking. It comprises six different cell-type specific isoforms: ACTA1, ACTA2, ACTB, ACTC1, ACTG1, and ACTG2. Abnormal actin isoform expression has been reported in many cancers, which led us to hypothesize that it may serve as an early biomarker of cancer. We show an overview of the different actin isoforms and highlight mechanisms by which they may contribute to tumorigenicity. Furthermore, we suggest how the aberrant expression of actin subunits can confer cells with greater proliferation ability, increased migratory capability, and chemoresistance through incorporation into the normal cellular F-actin network and altered actin binding protein interaction. Studying this fundamental change that takes place within cancer cells can further our understanding of neoplastic transformation in multiple tissue types, which can ultimately aid in the early-detection, diagnosis and treatment of cancer.
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Affiliation(s)
- Rahul Suresh
- Montreal Neurological Institute, Integrated Program in Neuroscience, McGill University, Montreal, Canada
| | - Roberto J Diaz
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, Faculty of Medicine, McGill University, Montreal, Canada.
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3
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Gonzalez-Santamarta M, Quinet G, Reyes-Garau D, Sola B, Roué G, Rodriguez MS. Resistance to the Proteasome Inhibitors: Lessons from Multiple Myeloma and Mantle Cell Lymphoma. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1233:153-174. [PMID: 32274756 DOI: 10.1007/978-3-030-38266-7_6] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Since its introduction in the clinics in early 2000s, the proteasome inhibitor bortezomib (BTZ) significantly improved the prognosis of patients with multiple myeloma (MM) and mantle cell lymphoma (MCL), two of the most challenging B cell malignancies in western countries. However, relapses following BTZ therapy are frequent, while primary resistance to this agent remains a major limitation for further development of its therapeutic potential. In the present chapter, we recapitulate the molecular mechanisms associated with intrinsic and acquired resistance to BTZ learning from MM and MCL experience, including mutations of crucial genes and activation of prosurvival signalling pathways inherent to malignant B cells. We also outline the preclinical and clinical evaluations of some potential druggable targets associated to BTZ resistance, considering the most meaningful findings of the past 10 years. Although our understanding of BTZ resistance is far from being completed, recent discoveries are contributing to develop new approaches to treat relapsed MM and MCL patients.
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Affiliation(s)
| | | | - Diana Reyes-Garau
- Lymphoma Translational Group, Josep Carreras Leukaemia Research Institute (IJC), Badalona (Barcelona), Spain
| | - Brigitte Sola
- Normandie University, INSERM UMR1245, UNICAEN, Caen, France
| | - Gaël Roué
- Lymphoma Translational Group, Josep Carreras Leukaemia Research Institute (IJC), Badalona (Barcelona), Spain
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Li YJ, Huang TH, Hsiao M, Lin BR, Cheng SJ, Yang CN, Lai WT, Wu TS, Fan JR, Kuo MYP, Chang CC. Suppression of fructose-bisphosphate aldolase C expression as a predictor of advanced oral squamous cell carcinoma. Head Neck 2015; 38 Suppl 1:E1075-85. [PMID: 26565993 DOI: 10.1002/hed.24161] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2015] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Glycolysis machinery regulates cancer cell behavior. However, the roles of these glycolysis enzymes in oral squamous cell carcinoma (OSCC) progression remain unknown. METHODS Fructose-bisphosphate aldolase C (ALDOC) expression in OSCC patients and cell lines was detected using quantitative real-time polymerase chain reaction (PCR). The functions of ALDOC in migration and invasion were determined using gain and loss of function approaches. An orthotopic OSCC animal model was performed to investigate the effects of ALDOC on metastasis and tumorigenesis in vivo. RESULTS ALDOC expression is negatively significantly correlated with clinical outcome and cell migration in vitro and in vivo. ALDOC blocks adenosine triphosphate generation and lactate production, and mutation constructs of Arg42 and Lys146 functionally restore ALDOC-inhibited cell migration and invasion. CONCLUSION ALDOC functions as an OSCC prognosis marker clinically, and suppresses migration and invasion by its catalytic domain of Arg42 and Lys146. © 2015 Wiley Periodicals, Inc. Head Neck 38: E1075-E1085, 2016.
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Affiliation(s)
- Yue-Ju Li
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan.,Angiogenesis Research Center, National Taiwan University, Taipei, Taiwan
| | - Tse-Hung Huang
- Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Michael Hsiao
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Been-Ren Lin
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - Shih-Jung Cheng
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
| | - Cheng-Ning Yang
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan.,Angiogenesis Research Center, National Taiwan University, Taipei, Taiwan.,Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - Wei-Ting Lai
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Tai-Sheng Wu
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Jia-Ruei Fan
- Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Mark Yen-Ping Kuo
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei, Taiwan.,Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan.,Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
| | - Cheng-Chi Chang
- Angiogenesis Research Center, National Taiwan University, Taipei, Taiwan.,Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan.,Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
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Identification of proteins responsible for adriamycin resistance in breast cancer cells using proteomics analysis. Sci Rep 2015; 5:9301. [PMID: 25818003 PMCID: PMC4377623 DOI: 10.1038/srep09301] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 02/24/2015] [Indexed: 01/02/2023] Open
Abstract
Chemoresistance is a poor prognostic factor in breast cancer and is a major obstacle to the successful treatment of patients receiving chemotherapy. However, the precise mechanism of resistance remains unclear. In this study, a pair of breast cancer cell lines, MCF-7 and its adriamycin-resistant counterpart MCF-7/ADR was used to examine resistance-dependent cellular responses and to identify potential therapeutic targets. We applied nanoflow liquid chromatography (nLC) and tandem mass tags (TmT) quantitative mass spectrometry to distinguish the differentially expressed proteins (DEPs) between the two cell lines. Bioinformatics analyses were used to identify functionally active proteins and networks. 80 DEPs were identified with either up- or down-regulation. Basing on the human protein-protein interactions (PPI), we have retrieved the associated functional interaction networks for the DEPs and analyzed the biological functions. Six different signaling pathways and most of the DEPs strongly linked to chemoresistance, invasion, metastasis development, proliferation, and apoptosis. The identified proteins in biological networks served to resistant drug and to select critical candidates for validation analyses by western blot. The glucose-6-phosphate dehydrogenase (G6PD), gamma-glutamyl cyclotransferase (GGCT), isocitrate dehydrogenase 1 (NADP+,soluble)(IDH1), isocitrate dehydrogenase 2 (NADP+,mitochondrial) (IDH2) and glutathione S-transferase pi 1(GSTP1), five of the critical components of GSH pathway, contribute to chemoresistance.
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Gerster S, Kwon T, Ludwig C, Matondo M, Vogel C, Marcotte EM, Aebersold R, Bühlmann P. Statistical approach to protein quantification. Mol Cell Proteomics 2013; 13:666-77. [PMID: 24255132 DOI: 10.1074/mcp.m112.025445] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
A major goal in proteomics is the comprehensive and accurate description of a proteome. This task includes not only the identification of proteins in a sample, but also the accurate quantification of their abundance. Although mass spectrometry typically provides information on peptide identity and abundance in a sample, it does not directly measure the concentration of the corresponding proteins. Specifically, most mass-spectrometry-based approaches (e.g. shotgun proteomics or selected reaction monitoring) allow one to quantify peptides using chromatographic peak intensities or spectral counting information. Ultimately, based on these measurements, one wants to infer the concentrations of the corresponding proteins. Inferring properties of the proteins based on experimental peptide evidence is often a complex problem because of the ambiguity of peptide assignments and different chemical properties of the peptides that affect the observed concentrations. We present SCAMPI, a novel generic and statistically sound framework for computing protein abundance scores based on quantified peptides. In contrast to most previous approaches, our model explicitly includes information from shared peptides to improve protein quantitation, especially in eukaryotes with many homologous sequences. The model accounts for uncertainty in the input data, leading to statistical prediction intervals for the protein scores. Furthermore, peptides with extreme abundances can be reassessed and classified as either regular data points or actual outliers. We used the proposed model with several datasets and compared its performance to that of other, previously used approaches for protein quantification in bottom-up mass spectrometry.
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Affiliation(s)
- Sarah Gerster
- Seminar for Statistics, Eidgenössische Technische Hochschule (ETH) Zurich, Rämistrasse 101, 8092 Zurich, Switzerland
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Streckfus CF, Romaguera J, Guajardo-Streckfus C. The use of salivary protein secretions as an in vivo model to study Mantel cell lymphoma progression and treatment. Cancer Invest 2013; 31:494-9. [PMID: 23915074 DOI: 10.3109/07357907.2013.820319] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE The objective of this study was to compare the salivary protein profiles from an individual diagnosed with MCL before, during, and after chemotherapy. METHODS Saliva specimens acquire prior, during, and after chemotherapy. Specimens were analyzed using a LC-MS/MS mass spectrometer. RESULTS The results of the study suggest salivary protein alterations secondary to MCL and that a number of the proteins were changed as a result of chemotherapeutic intervention suggesting that the treatment, from a proteomic perspective, was efficacious. The study suggests that salivary secretions may be used as in vivo model for studying MCL progression and treatment efficacy.
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Affiliation(s)
- Charles F Streckfus
- Dental Branch, Department of Diagnostic and Biomedical Sciences, University of Texas Health Science Center (UTHSC), Houston, Texas 77054, USA.
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8
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Guo C, Liu S, Wang J, Sun MZ, Greenaway FT. ACTB in cancer. Clin Chim Acta 2012; 417:39-44. [PMID: 23266771 DOI: 10.1016/j.cca.2012.12.012] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 11/27/2012] [Accepted: 12/01/2012] [Indexed: 01/27/2023]
Abstract
Beta-actin (ACTB) has traditionally been regarded as an endogenous housekeeping gene and has been widely used as a reference gene/protein in quantifying expression levels in tumors. However, ACTB is closely associated with a variety of cancers and accumulating evidence indicates that ACTB is de-regulated in liver, melanoma, renal, colorectal, gastric, pancreatic, esophageal, lung, breast, prostate, ovarian cancers, leukemia and lymphoma. ACTB is generally found to be up-regulated in the majority of tumor cells and tissues. The abnormal expression and polymerization of ACTB and the resulting changes to the cytoskeleton are revealed to be associated with the invasiveness and metastasis of cancers. The current review explores relevant mechanisms, integrates current understandings, and provides suggestions for future studies of the roles of ACTB in tumors.
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Affiliation(s)
- Chunmei Guo
- Department of Biotechnology, Dalian Medical University, Dalian 116044, China
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Uttenweiler-Joseph S, Bouyssié D, Calligaris D, Lutz PG, Monsarrat B, Burlet-Schiltz O. Quantitative proteomic analysis to decipher the differential apoptotic response of bortezomib-treated APL cells before and after retinoic acid differentiation reveals involvement of protein toxicity mechanisms. Proteomics 2012; 13:37-47. [DOI: 10.1002/pmic.201200233] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 08/30/2012] [Accepted: 10/02/2012] [Indexed: 12/24/2022]
Affiliation(s)
- Sandrine Uttenweiler-Joseph
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - David Bouyssié
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - David Calligaris
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - Pierre G. Lutz
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - Bernard Monsarrat
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
| | - Odile Burlet-Schiltz
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale); Toulouse France
- Université de Toulouse; UPS; IPBS; Toulouse France
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10
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Bousquet-Dubouch MP, Fabre B, Monsarrat B, Burlet-Schiltz O. Proteomics to study the diversity and dynamics of proteasome complexes: from fundamentals to the clinic. Expert Rev Proteomics 2012; 8:459-81. [PMID: 21819302 DOI: 10.1586/epr.11.41] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This article covers the latest contributions of proteomics to the structural and functional characterization of proteasomes and their associated proteins, but also to the detection of proteasomes as clinical biomarkers in diseases. Proteasomes are highly heterogenous supramolecular complexes and constitute important cellular proteases controlling the pool of proteins involved in key cellular functions. The comprehension of the structure/function relationship of proteasomes is therefore of major interest in biology. Numerous biochemical methods have been employed to purify proteasomes, and have led to the identification of complexes of various compositions - depending on the experimental conditions and the type of strategy used. In association with protein separation and enrichment techniques, modern mass spectrometry instruments and mass spectrometry-based quantitative methods, they have led to unprecedented breakthroughs in the in-depth analysis of the diversity and dynamics of proteasome composition and localization under various stimuli or pathological contexts. Proteasome inhibitors are now used in clinics for the treatment of cancer, and recent studies propose that the proteasome should be considered as a predictive biomarker for various pathologies.
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11
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Schlieben P, Meyer A, Weise C, Bondzio A, Einspanier R, Gruber AD, Klopfleisch R. Differences in the proteome of high-grade versus low-grade canine cutaneous mast cell tumours. Vet J 2012; 194:210-4. [PMID: 22578690 DOI: 10.1016/j.tvjl.2012.04.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Revised: 03/17/2012] [Accepted: 04/01/2012] [Indexed: 12/28/2022]
Abstract
Cutaneous mast cell tumours (MCTs) are the most common skin tumours in dogs. However, the molecular differences between benign tumours with a good prognosis and highly malignant, invasive and metastatic tumours with short survival times are for the most part unclear. In the present study the proteome of low-grade MCTs with a good prognosis was compared with that of poor-prognosis high-grade tumours independent of their mutational status of exon 11 of the KIT gene. Using two-dimensional difference gel electrophoresis and mass spectrometry, 13 proteins with a significant differential expression between the two groups were identified. Four stress response proteins (HSPA9, PDIA3, TCP1A and TCP1E) were significantly up-regulated in high-grade tumours, while proteins mainly associated with cell motility and metastasis had either increased (WDR1, ACTR3, ANXA6) or decreased (ANXA2, ACTB) expression levels. High-grade tumours also had a paradox down-regulation of transferrin, a protein that is usually up-regulated in neoplastic cells. The histologically observable dedifferentiation of high-grade tumours was reflected by decreased tryptase protein expression levels. Results of quantitative real-time RT-PCR analysis indicated that the differences in protein expression levels of most proteins were regulated at the transcript level. Based on these findings, it is hypothesized that high-grade MCT cells have a higher resistance to cellular stress and thus are able to better cope with the adverse environment in highly proliferating tumours independent of increased KIT signalling. It is noteworthy that some of the proteins identified have been proposed as therapeutic targets for human oncology and it will be interesting to evaluate their therapeutic and diagnostic potential for canine MCTs.
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Affiliation(s)
- P Schlieben
- Department of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Straße 15, 14163 Berlin, Germany
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Pighi C, Gu TL, Dalai I, Barbi S, Parolini C, Bertolaso A, Pedron S, Parisi A, Ren J, Cecconi D, Chilosi M, Menestrina F, Zamò A. Phospho-proteomic analysis of mantle cell lymphoma cells suggests a pro-survival role of B-cell receptor signaling. Cell Oncol (Dordr) 2011; 34:141-53. [PMID: 21394647 PMCID: PMC3063577 DOI: 10.1007/s13402-011-0019-7] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/12/2011] [Indexed: 01/29/2023] Open
Abstract
Background Mantle cell lymphoma (MCL) is currently an incurable entity, and new therapeutic approaches are needed. We have applied a high-throughput phospho-proteomic technique to MCL cell lines to identify activated pathways and we have then validated our data in both cell lines and tumor tissues. Methods PhosphoScan analysis was performed on MCL cell lines. Results were validated by flow cytometry and western blotting. Functional validation was performed by blocking the most active pathway in MCL cell lines. Results PhosphoScan identified more than 300 tyrosine-phosporylated proteins, among which many protein kinases. The most abundant peptides belonged to proteins connected with B-cell receptor (BCR) signaling. Active BCR signaling was demonstrated by flow cytometry in MCL cells and by western blotting in MCL tumor tissues. Blocking BCR signaling by Syk inhibitor piceatannol induced dose/time-dependent apoptosis in MCL cell lines, as well as several modifications in the phosphorylation status of BCR pathway members and a collapse of cyclin D1 protein levels. Conclusion Our data support a pro-survival role of BCR signaling in MCL and suggest that this pathway might be a candidate for therapy. Our findings also suggest that Syk activation patterns might be different in MCL compared to other lymphoma subtypes. Electronic supplementary material The online version of this article (doi:10.1007/s13402-011-0019-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Chiara Pighi
- Department of Pathology and Diagnostics, University of Verona, P.le Scuro 10, 37134, Verona, Italy
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The Hsp90 inhibitor IPI-504 overcomes bortezomib resistance in mantle cell lymphoma in vitro and in vivo by down-regulation of the prosurvival ER chaperone BiP/Grp78. Blood 2010; 117:1270-9. [PMID: 21106982 DOI: 10.1182/blood-2010-04-278853] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Despite the promising introduction of the proteasome inhibitor bortezomib in the treatment of mantle cell lymphoma (MCL), not all patients respond, and resistance often appears after initial treatment. By analyzing a set of 18 MCL samples, including cell lines with constitutive or induced resistance to bortezomib, we found a high correlation between loss of sensitivity to the proteasome inhibitor and up-regulation of the prosurvival chaperone BiP/Grp78. BiP/Grp78 stabilization was ensured at a posttranscriptional level by an increase in the chaperoning activity of heat shock protein of 90 kDa (Hsp90). In bortezomib-resistant cells, both BiP/Grp78 knockdown and cell pretreatment with the Hsp90 inhibitor of the ansamycin class, IPI-504, led to synergistic induction of apoptotic cell death when combined with bortezomib. Cell exposure to the IPI-504-bortezomib combination provoked the dissociation of Hsp90/BiP complexes, leading to BiP/Grp78 depletion, inhibition of unfolded protein response, and promotion of NOXA-mediated mitochondrial depolarization. The IPI-504-bortezomib combination also prevented BiP/Grp78 accumulation, thereby promoting apoptosis and inhibiting the growth of bortezomib-resistant tumors in a mouse model of MCL xenotransplantation. These results suggest that targeting unfolded protein response activation by the inhibition of Hsp90 may be an attractive model for the design of a new bortezomib-based combination therapy for MCL.
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Proteomic analysis of lymphoid and haematopoietic neoplasms: There's more than biomarker discovery. J Proteomics 2010; 73:508-20. [DOI: 10.1016/j.jprot.2009.08.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2009] [Revised: 08/26/2009] [Accepted: 08/27/2009] [Indexed: 12/29/2022]
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