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Campellone KG, Lebek NM, King VL. Branching out in different directions: Emerging cellular functions for the Arp2/3 complex and WASP-family actin nucleation factors. Eur J Cell Biol 2023; 102:151301. [PMID: 36907023 DOI: 10.1016/j.ejcb.2023.151301] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 02/07/2023] [Accepted: 02/25/2023] [Indexed: 03/06/2023] Open
Abstract
The actin cytoskeleton impacts practically every function of a eukaryotic cell. Historically, the best-characterized cytoskeletal activities are in cell morphogenesis, motility, and division. The structural and dynamic properties of the actin cytoskeleton are also crucial for establishing, maintaining, and changing the organization of membrane-bound organelles and other intracellular structures. Such activities are important in nearly all animal cells and tissues, although distinct anatomical regions and physiological systems rely on different regulatory factors. Recent work indicates that the Arp2/3 complex, a broadly expressed actin nucleator, drives actin assembly during several intracellular stress response pathways. These newly described Arp2/3-mediated cytoskeletal rearrangements are coordinated by members of the Wiskott-Aldrich Syndrome Protein (WASP) family of actin nucleation-promoting factors. Thus, the Arp2/3 complex and WASP-family proteins are emerging as crucial players in cytoplasmic and nuclear activities including autophagy, apoptosis, chromatin dynamics, and DNA repair. Characterizations of the functions of the actin assembly machinery in such stress response mechanisms are advancing our understanding of both normal and pathogenic processes, and hold great promise for providing insights into organismal development and interventions for disease.
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Affiliation(s)
- Kenneth G Campellone
- Department of Molecular and Cell Biology, Institute for Systems Genomics; University of Connecticut; Storrs, CT, USA.
| | - Nadine M Lebek
- Department of Molecular and Cell Biology, Institute for Systems Genomics; University of Connecticut; Storrs, CT, USA
| | - Virginia L King
- Department of Molecular and Cell Biology, Institute for Systems Genomics; University of Connecticut; Storrs, CT, USA
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2
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Kawaguchi K, Asano S. Pathophysiological Roles of Actin-Binding Scaffold Protein, Ezrin. Int J Mol Sci 2022; 23:ijms23063246. [PMID: 35328667 PMCID: PMC8952289 DOI: 10.3390/ijms23063246] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/14/2022] [Accepted: 03/14/2022] [Indexed: 02/06/2023] Open
Abstract
Ezrin is one of the members of the ezrin/radixin/moesin (ERM) family of proteins. It was originally discovered as an actin-binding protein in the microvilli structure about forty years ago. Since then, it has been revealed as a key protein with functions in a variety of fields including cell migration, survival, and signal transduction, as well as functioning as a structural component. Ezrin acts as a cross-linker of membrane proteins or phospholipids in the plasma membrane and the actin cytoskeleton. It also functions as a platform for signaling molecules at the cell surface. Moreover, ezrin is regarded as an important target protein in cancer diagnosis and therapy because it is a key protein involved in cancer progression and metastasis, and its high expression is linked to poor survival in many cancers. Small molecule inhibitors of ezrin have been developed and investigated as candidate molecules that suppress cancer metastasis. Here, we wish to comprehensively review the roles of ezrin from the pathophysiological points of view.
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Mollinedo F, Gajate C. Lipid rafts as signaling hubs in cancer cell survival/death and invasion: implications in tumor progression and therapy: Thematic Review Series: Biology of Lipid Rafts. J Lipid Res 2020; 61:611-635. [PMID: 33715811 PMCID: PMC7193951 DOI: 10.1194/jlr.tr119000439] [Citation(s) in RCA: 151] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 01/17/2020] [Indexed: 12/13/2022] Open
Abstract
Cholesterol/sphingolipid-rich membrane domains, known as lipid rafts or membrane rafts, play a critical role in the compartmentalization of signaling pathways. Physical segregation of proteins in lipid rafts may modulate the accessibility of proteins to regulatory or effector molecules. Thus, lipid rafts serve as sorting platforms and hubs for signal transduction proteins. Cancer cells contain higher levels of intracellular cholesterol and lipid rafts than their normal non-tumorigenic counterparts. Many signal transduction processes involved in cancer development (insulin-like growth factor system and phosphatidylinositol 3-kinase-AKT) and metastasis [cluster of differentiation (CD)44] are dependent on or modulated by lipid rafts. Additional proteins playing an important role in several malignant cancers (e.g., transmembrane glycoprotein mucin 1) are also being detected in association with lipid rafts, suggesting a major role of lipid rafts in tumor progression. Conversely, lipid rafts also serve as scaffolds for the recruitment and clustering of Fas/CD95 death receptors and downstream signaling molecules leading to cell death-promoting raft platforms. The partition of death receptors and downstream signaling molecules in aggregated lipid rafts has led to the formation of the so-called cluster of apoptotic signaling molecule-enriched rafts, or CASMER, which leads to apoptosis amplification and can be pharmacologically modulated. These death-promoting rafts can be viewed as a linchpin from which apoptotic signals are launched. In this review, we discuss the involvement of lipid rafts in major signaling processes in cancer cells, including cell survival, cell death, and metastasis, and we consider the potential of lipid raft modulation as a promising target in cancer therapy.
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Affiliation(s)
- Faustino Mollinedo
- Laboratory of Cell Death and Cancer Therapy, Department of Molecular Biomedicine, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Cientificas (CSIC), E-28040 Madrid, Spain. mailto:
| | - Consuelo Gajate
- Laboratory of Cell Death and Cancer Therapy, Department of Molecular Biomedicine, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Cientificas (CSIC), E-28040 Madrid, Spain
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The Btk-dependent PIP5K1γ lipid kinase activation by Fas counteracts FasL-induced cell death. Apoptosis 2017; 22:1344-1352. [PMID: 28879546 DOI: 10.1007/s10495-017-1415-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The Fas/FasL system plays a critical role in death by apoptosis and immune escape of cancer cells. The Fas receptor being ubiquitously expressed in tissues, its apoptotic-inducing function, initiated upon FasL binding, is tightly regulated by several negative regulatory mechanisms to prevent inappropriate cell death. One of them, involving the non-receptor tyrosine kinase Btk, was reported mainly in B cells and only poorly described. We report here that Btk negatively regulates, through its tyrosine kinase activity, the FasL-mediated cell death in epithelial cell lines from colon cancer origin. More importantly, we show that Btk interacts not only with Fas but also with the phosphatidylinositol-4-phosphate 5-kinase, PIP5K1γ, which, upon stimulation by Fas ligand, is responsible of a rapid and transient synthesis of phosphatidylinositol-4,5-bisphosphate (PI(4,5)P2). This production requires both the presence and the tyrosine kinase activity of Btk, and participates in the negative regulation of FasL-mediated cell death since knocking down PIP5K1γ expression significantly strengthens the apoptotic signal upon FasL engagement. Altogether, our data demonstrate the cooperative role of Btk and PIP5K1γ in a FasL-induced PI(4,5)P2 production, both proteins participating to the threshold setting of FasL-induced apoptotic commitment in colorectal cell lines.
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Li P, Ying J, Chang Q, Zhu W, Yang G, Xu T, Yi H, Pan R, Zhang E, Zeng X, Yan C, Bao Q, Li S. Effects of phycoerythrin from Gracilaria lemaneiformis in proliferation and apoptosis of SW480 cells. Oncol Rep 2016; 36:3536-3544. [PMID: 27748904 DOI: 10.3892/or.2016.5162] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 08/29/2016] [Indexed: 11/06/2022] Open
Abstract
We studied phycoerythrin (PE) in human SW480 tumor cells and the underlying molecular mechanisms of action. PE inhibited cell proliferation as evidenced by CCK-8 assay. The IC50 values of phycoerythrin were 48.2 and 27.4 µg/ml for 24 and 48 h of exposure, respectively. PE induced apoptosis and cell cycle arrest in SW480 cells as observed under electron microscopy and with flow cytometry. Apoptosis increased from 5.1 (controls) to 39.0% in 80.0 µg/ml PE-treated cells. Differences in protein expression were identified using proteomic techniques. Protein spots (1018±60 and 1010±60) were resolved in PE-treated and untreated group. Forty differential protein spots were analyzed with MALDI-TOF-MS, including GRP78 and NPM1. The expression as measured by qPCR and western blotting agreed with data from two-dimensional electrophoresis. GRP78, NPM1, MTHSP75, Ezrin and Annexin A2 were decreased and HSP60 was increased after PE treatment, indicating that PE may target multiple proteins to induce apoptosis.
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Affiliation(s)
- Peizhen Li
- School of Forensic Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
| | - Jun Ying
- School of Forensic Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
| | - Qingli Chang
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
| | - Wen Zhu
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
| | - Guangjian Yang
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
| | - Teng Xu
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
| | - Huiguang Yi
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
| | - Ruowang Pan
- 118 Hospital of PLA, Wenzhou, Zhejiang 325000, P.R. China
| | - Enyong Zhang
- 118 Hospital of PLA, Wenzhou, Zhejiang 325000, P.R. China
| | - Xiaofeng Zeng
- School of Forensic Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
| | - Chunxia Yan
- School of Forensic Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
| | - Qiyu Bao
- School of Laboratory Medicine and Life Science/Institute of Biomedical Informatics, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
| | - Shengbin Li
- School of Forensic Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
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Bianchi L, Gagliardi A, Maruelli S, Besio R, Landi C, Gioia R, Kozloff KM, Khoury BM, Coucke PJ, Symoens S, Marini JC, Rossi A, Bini L, Forlino A. Altered cytoskeletal organization characterized lethal but not surviving Brtl+/- mice: insight on phenotypic variability in osteogenesis imperfecta. Hum Mol Genet 2015; 24:6118-33. [PMID: 26264579 DOI: 10.1093/hmg/ddv328] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 08/06/2015] [Indexed: 02/02/2023] Open
Abstract
Osteogenesis imperfecta (OI) is a heritable bone disease with dominant and recessive transmission. It is characterized by a wide spectrum of clinical outcomes ranging from very mild to lethal in the perinatal period. The intra- and inter-familiar OI phenotypic variability in the presence of an identical molecular defect is still puzzling to the research field. We used the OI murine model Brtl(+/-) to investigate the molecular basis of OI phenotypic variability. Brtl(+/-) resembles classical dominant OI and shows either a moderately severe or a lethal outcome associated with the same Gly349Cys substitution in the α1 chain of type I collagen. A systems biology approach was used. We took advantage of proteomic pathway analysis to functionally link proteins differentially expressed in bone and skin of Brtl(+/-) mice with different outcomes to define possible phenotype modulators. The skin/bone and bone/skin hybrid networks highlighted three focal proteins: vimentin, stathmin and cofilin-1, belonging to or involved in cytoskeletal organization. Abnormal cytoskeleton was indeed demonstrated by immunohistochemistry to occur only in tissues from Brtl(+/-) lethal mice. The aberrant cytoskeleton affected osteoblast proliferation, collagen deposition, integrin and TGF-β signaling with impairment of bone structural properties. Finally, aberrant cytoskeletal assembly was detected in fibroblasts obtained from lethal, but not from non-lethal, OI patients carrying an identical glycine substitution. Our data demonstrated that compromised cytoskeletal assembly impaired both cell signaling and cellular trafficking in mutant lethal mice, altering bone properties. These results point to the cytoskeleton as a phenotypic modulator and potential novel target for OI treatment.
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Affiliation(s)
- Laura Bianchi
- Functional Proteomics Laboratory, Department of Life Sciences, University of Siena, Siena, Italy
| | - Assunta Gagliardi
- Functional Proteomics Laboratory, Department of Life Sciences, University of Siena, Siena, Italy
| | - Silvia Maruelli
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy
| | - Roberta Besio
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy
| | - Claudia Landi
- Functional Proteomics Laboratory, Department of Life Sciences, University of Siena, Siena, Italy
| | - Roberta Gioia
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy
| | - Kenneth M Kozloff
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Basma M Khoury
- Orthopaedic Research Laboratories, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Paul J Coucke
- Center for Medical Genetics, Ghent University, Ghent, Belgium and
| | - Sofie Symoens
- Center for Medical Genetics, Ghent University, Ghent, Belgium and
| | - Joan C Marini
- Bone and Extracellular Matrix Branch, NICHD, National Institute of Health, Bethesda, MD, USA
| | - Antonio Rossi
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy
| | - Luca Bini
- Functional Proteomics Laboratory, Department of Life Sciences, University of Siena, Siena, Italy
| | - Antonella Forlino
- Department of Molecular Medicine, Biochemistry Unit, University of Pavia, Pavia, Italy,
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Gatti L, Cassinelli G, Zaffaroni N, Lanzi C, Perego P. New mechanisms for old drugs: Insights into DNA-unrelated effects of platinum compounds and drug resistance determinants. Drug Resist Updat 2015; 20:1-11. [PMID: 26003720 DOI: 10.1016/j.drup.2015.04.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 04/27/2015] [Accepted: 04/29/2015] [Indexed: 01/11/2023]
Abstract
Platinum drugs have been widely used for the treatment of several solid tumors. Although DNA has been recognized as the primary cellular target for these agents, there are unresolved issues concerning their effects and the molecular mechanisms underlying the antitumor efficacy. These cytotoxic agents interact with sub-cellular compartments other than the nucleus. Here, we review how such emerging phenomena contribute to the pharmacologic activity as well as to drug resistance phenotypes. DNA-unrelated effects of platinum drugs involve alterations at the plasma membrane and in endo-lysosomal compartments. A direct interaction with the mitochondria also appears to be implicated in drug-induced cell death. Moreover, the pioneering work of a few groups has shown that platinum drugs can act on the tumor microenvironment as well, and potentiate antitumor activity of the immune system. These poorly understood aspects of platinum drug activity sites may be harnessed to enhance their antitumor efficacy. A complete understanding of DNA-unrelated effects of platinum compounds might reveal new aspects of drug resistance allowing the implementation of the antitumor therapeutic efficacy of platinum compound-based regimens and minimization of their toxic side effects.
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Affiliation(s)
- Laura Gatti
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Via Amadeo 42/via Venezian 1, 20133 Milan, Italy
| | - Giuliana Cassinelli
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Via Amadeo 42/via Venezian 1, 20133 Milan, Italy
| | - Nadia Zaffaroni
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Via Amadeo 42/via Venezian 1, 20133 Milan, Italy
| | - Cinzia Lanzi
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Via Amadeo 42/via Venezian 1, 20133 Milan, Italy
| | - Paola Perego
- Molecular Pharmacology Unit, Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Via Amadeo 42/via Venezian 1, 20133 Milan, Italy.
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8
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Jensen NF, Stenvang J, Beck MK, Hanáková B, Belling KC, Do KN, Viuff B, Nygård SB, Gupta R, Rasmussen MH, Tarpgaard LS, Hansen TP, Budinská E, Pfeiffer P, Bosman F, Tejpar S, Roth A, Delorenzi M, Andersen CL, Rømer MU, Brünner N, Moreira JMA. Establishment and characterization of models of chemotherapy resistance in colorectal cancer: Towards a predictive signature of chemoresistance. Mol Oncol 2015; 9:1169-85. [PMID: 25759163 DOI: 10.1016/j.molonc.2015.02.008] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 01/13/2015] [Accepted: 02/16/2015] [Indexed: 02/07/2023] Open
Abstract
Current standard treatments for metastatic colorectal cancer (CRC) are based on combination regimens with one of the two chemotherapeutic drugs, irinotecan or oxaliplatin. However, drug resistance frequently limits the clinical efficacy of these therapies. In order to gain new insights into mechanisms associated with chemoresistance, and departing from three distinct CRC cell models, we generated a panel of human colorectal cancer cell lines with acquired resistance to either oxaliplatin or irinotecan. We characterized the resistant cell line variants with regards to their drug resistance profile and transcriptome, and matched our results with datasets generated from relevant clinical material to derive putative resistance biomarkers. We found that the chemoresistant cell line variants had distinctive irinotecan- or oxaliplatin-specific resistance profiles, with non-reciprocal cross-resistance. Furthermore, we could identify several new, as well as some previously described, drug resistance-associated genes for each resistant cell line variant. Each chemoresistant cell line variant acquired a unique set of changes that may represent distinct functional subtypes of chemotherapy resistance. In addition, and given the potential implications for selection of subsequent treatment, we also performed an exploratory analysis, in relevant patient cohorts, of the predictive value of each of the specific genes identified in our cellular models.
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Affiliation(s)
- Niels F Jensen
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark
| | - Jan Stenvang
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark
| | - Mette K Beck
- Technical University of Denmark, Department for Systems Biology, Center for Biological Sequence Analysis, Lyngby, Denmark
| | - Barbora Hanáková
- Masaryk University, Faculty of Medicine, Institute of Biostatistics and Analyses, Brno, Czech Republic
| | - Kirstine C Belling
- Technical University of Denmark, Department for Systems Biology, Center for Biological Sequence Analysis, Lyngby, Denmark
| | - Khoa N Do
- Technical University of Denmark, Department for Systems Biology, Center for Biological Sequence Analysis, Lyngby, Denmark
| | - Birgitte Viuff
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark
| | - Sune B Nygård
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark
| | - Ramneek Gupta
- Technical University of Denmark, Department for Systems Biology, Center for Biological Sequence Analysis, Lyngby, Denmark
| | - Mads H Rasmussen
- Aarhus University Hospital, Department of Molecular Medicine, Aarhus, Denmark
| | - Line S Tarpgaard
- University of Southern Denmark, Institute of Clinical Research, Oncology Unit, Odense, Denmark
| | - Tine P Hansen
- University of Southern Denmark, Institute of Clinical Research, Pathology Unit, Odense, Denmark
| | - Eva Budinská
- Masaryk University, Faculty of Medicine, Institute of Biostatistics and Analyses, Brno, Czech Republic
| | - Per Pfeiffer
- University of Southern Denmark, Institute of Clinical Research, Oncology Unit, Odense, Denmark
| | - Fred Bosman
- University of Lausanne, University Institute of Pathology, Lausanne, Switzerland
| | - Sabine Tejpar
- University Hospital Gasthuisberg, Digestive Oncology Unit, Leuven, Belgium
| | - Arnaud Roth
- University Hospital of Geneva, Oncosurgery Unit, Geneva, Switzerland
| | - Mauro Delorenzi
- SIB Swiss Institute of Bioinformatics, Bioinformatics Core Facility, Lausanne, Switzerland; University of Lausanne, Ludwig Center for Cancer Research, Lausanne, Switzerland; University of Lausanne, Oncology Department, Lausanne, Switzerland
| | - Claus L Andersen
- Aarhus University Hospital, Department of Molecular Medicine, Aarhus, Denmark
| | - Maria U Rømer
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark
| | - Nils Brünner
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark.
| | - José M A Moreira
- University of Copenhagen, Faculty of Health and Medical Sciences, Department of Veterinary Disease Biology, Frederiksberg, Denmark
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Song S, Chen D, Ma T, Luo Y, Yang Z, Wang D, Fan X, Qin Q, Ni B, Guo X, Xian Z, Lan P, Cao X, Li M, Wang J, Wang L. Molecular mechanism of acute radiation enteritis revealed using proteomics and biological signaling network analysis in rats. Dig Dis Sci 2014; 59:2704-13. [PMID: 24927798 DOI: 10.1007/s10620-014-3224-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 05/21/2014] [Indexed: 12/09/2022]
Abstract
BACKGROUND AND AIMS Radiation enteritis (RE) has emerged as a significant complication that can progress to severe gastrointestinal disease and the mechanisms underlying its genesis remain poorly understood. The aim of this study was to identify temporal changes in protein expression potentially associated with acute inflammation and to elucidate the mechanism underlying radiation enteritis genesis. METHODS Male Sprague-Dawley rats were irradiated in the abdomen with a single dose of 10 Gy to establish an in vivo model of acute radiation enteritis. Two-dimensional fluorescence difference gel electrophoresis, matrix-assisted laser desorption/ionization time-of-flight spectrometer (MALDI-TOF) tandem mass spectrometry, and peptide mass fingerprinting were used to determine differentially expressed proteins between normal and inflamed intestinal mucosa. Additionally, differentially expressed proteins were evaluated by KO Based Annotation System to find the biological functions associated with acute radiation enteritis. RESULTS Intensity changes of 86 spots were detected with statistical significance (ratio ≥ 1.5 or ≤ 1.5, P < 0.05). Sixty one of the 86 spots were identified by MALDI-TOF/TOF tandem mass spectrometry. These radiation-induced proteins with biological functions showed that the FAS pathway and glycolysis signaling pathways were significantly altered using the KOBAS tool. CONCLUSIONS Our results reveal an underlying mechanism of radiation-induced acute enteritis, which may help clarify the pathogenesis of RE and point to potential targets for therapeutic interventions.
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Affiliation(s)
- Shunxin Song
- Gastrointestinal Institute of Sun Yat-Sen University, The Sixth Affiliated Hospital of Sun Yat-Sen University, 26 Yuancunerheng Road, Guangzhou, 510655, People's Republic of China
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10
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Shin JU, Lee WJ, Oh SH, Kim DY, Kim DS, Jung I, Lee JH. Altered vimentin protein expression in human dermal microvascular endothelial cells after ultraviolet or intense pulsed light treatment. Lasers Surg Med 2014; 46:431-8. [DOI: 10.1002/lsm.22253] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/26/2014] [Indexed: 01/13/2023]
Affiliation(s)
- Jung U Shin
- Department of Dermatology and Cutaneous Biology Research Institute, Institute for Human Tissue Restoration; Yonsei University College of Medicine; Seoul South Korea
| | - Won Jai Lee
- Department of Plastic and Reconstructive Surgery; Yonsei University College of Medicine; Seoul South Korea
| | - Sang Ho Oh
- Department of Dermatology and Cutaneous Biology Research Institute, Institute for Human Tissue Restoration; Yonsei University College of Medicine; Seoul South Korea
| | - Do Young Kim
- Department of Dermatology and Cutaneous Biology Research Institute, Institute for Human Tissue Restoration; Yonsei University College of Medicine; Seoul South Korea
| | - Dae Suk Kim
- Department of Dermatology and Cutaneous Biology Research Institute, Institute for Human Tissue Restoration; Yonsei University College of Medicine; Seoul South Korea
| | - Inhee Jung
- Department of Dermatology and Cutaneous Biology Research Institute, Institute for Human Tissue Restoration; Yonsei University College of Medicine; Seoul South Korea
| | - Ju Hee Lee
- Department of Dermatology and Cutaneous Biology Research Institute, Institute for Human Tissue Restoration; Yonsei University College of Medicine; Seoul South Korea
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Abstract
This chapter describes reports of the structural characterization of death ligands and death receptors (DRs) from the tumor necrosis factor (TNF) and TNF receptor families. The review discusses the interactions of these proteins with agonist ligands, inhibitors, and downstream signaling molecules. Though historically labeled as being implicated in programmed cell death, the function of these proteins extends to nonapoptotic pathways. The review highlights, from a structural biology perspective, the complexity of DR signaling and the ongoing challenge to discern the precise mechanisms that occur at the point of DR activation, including how the degree to which the receptors are induced to cluster may be related to the nature of the impact upon the cell. The potential for posttranslational modification and receptor internalization to play roles in DR signaling is briefly discussed.
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Affiliation(s)
- Paul C Driscoll
- Division of Molecular Structure, Medical Research Council, National Institute for Medical Research, London, United Kingdom.
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12
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Gilbert S, Loranger A, Lavoie JN, Marceau N. Cytoskeleton keratin regulation of FasR signaling through modulation of actin/ezrin interplay at lipid rafts in hepatocytes. Apoptosis 2012; 17:880-94. [PMID: 22585043 DOI: 10.1007/s10495-012-0733-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
FasR stimulation by Fas ligand leads to rapid formation of FasR microaggregates, which become signaling protein oligomerization transduction structures (SPOTS), through interactions with actin and ezrin, a structural step that triggers death-inducing signaling complex formation, in association with procaspase-8 activation. In some cells, designated as type I, caspase 8 directly activates effector caspases, whereas in others, known as type II, the caspase-mediated death signaling is amplified through mitochondria. Keratins are the intermediate filament (IF) proteins of epithelial cells, expressed as pairs in a lineage/differentiation manner. Hepatocyte IFs are made solely of keratins 8/18 (K8/K18), the hallmark of all simple epithelia. We have shown recently that in comparison to type II wild-type (WT) mouse hepatocytes, the absence of K8/K18 IFs in K8-null hepatocytes leads to more efficient FasR-mediated apoptosis, in link with a type II/type I-like switch in FasR-death signaling. Here, we demonstrate that the apoptotic process occurring in type I-like K8-null hepatocytes is associated with accelerated SPOTS elaboration at surface membrane, along with manifestation of FasR cap formation and internalization. In addition, the lipid raft organization is altered in K8-null hepatocytes. While lipid raft inhibition impairs SPOTS formation in both WT and K8-null hepatocytes, the absence of K8/K18 IFs in the latter sensitizes SPOTS to actin de-polymerization, and perturbs ezrin compartmentalization. Overall, the results indicate that the K8/K18 IF loss in hepatocytes alters the initial FasR activation steps through perturbation of ezrin/actin interplay and lipid raft organization, which leads to a type II/type I switch in FasR-death signaling.
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Affiliation(s)
- Stéphane Gilbert
- Centre de Recherche en Cancérologie de l'Université Laval, and Centre de Recherche du Centre Hospitalier de Québec (CRCHUQ)/HDQ, 9 rue McMahon, Quebec, G1R 2J6, Canada
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Hoogwater FJH, Steller EJA, Westendorp BF, Borel Rinkes IHM, Kranenburg O. CD95 signaling in colorectal cancer. Biochim Biophys Acta Rev Cancer 2012; 1826:189-98. [PMID: 22498253 DOI: 10.1016/j.bbcan.2012.03.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 03/09/2012] [Accepted: 03/10/2012] [Indexed: 02/07/2023]
Abstract
CD95 and its ligand (CD95L) are widely expressed in colorectal tumors, but their role in shaping tumor behavior is unclear. CD95 activation on tumor cells can lead to apoptosis, while CD95L attracts neutrophils, suggesting a function in tumor suppression. However, CD95 can also promote tumorigenesis, at least in part by activating non-apoptotic signaling pathways that stimulate tumor cell proliferation, invasion and survival. In addition, CD95 signaling in stromal cells and tumor-infiltrating inflammatory cells has to be taken into account when addressing the function of CD95 and its ligand in colorectal tumor biology. We present a model in which the tumor-suppressing and tumor-promoting activities of CD95/CD95L together determine colorectal tumor behavior. We also discuss how these multiple activities are changing our view of CD95 and CD95L as potential therapeutic targets in the treatment of colorectal cancer. We conclude that locking CD95 in apoptosis-mode may be a more promising anti-cancer strategy than simply inhibiting or stimulating CD95.
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Brambilla D, Zamboni S, Federici C, Lugini L, Lozupone F, De Milito A, Cecchetti S, Cianfriglia M, Fais S. P-glycoprotein binds to ezrin at amino acid residues 149-242 in the FERM domain and plays a key role in the multidrug resistance of human osteosarcoma. Int J Cancer 2011; 130:2824-34. [PMID: 21780101 DOI: 10.1002/ijc.26285] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Accepted: 05/31/2011] [Indexed: 02/01/2023]
Abstract
Overexpression of the mdr1 gene encoding P-glycoprotein (Pgp) exerts a major role in reducing the effectiveness of cytotoxic therapy in osteosarcoma. The interaction between actin and Pgp has been shown to be instrumental in the establishment of multidrug resistance (MDR) in human tumor cells. The cytoskeleton linker ezrin exerts a pivotal role in maintaining the functional connection between actin and Pgp. We investigated the role of ezrin in a human multidrug-resistant osteosarcoma cell line overexpressing Pgp and compared it to its counterpart that overexpresses an ezrin deletion mutant. The results showed that Pgp binds at amino acid residues 149-242 of the N-terminal domain of ezrin. The interaction between ezrin and Pgp occurs in the plasma membrane of MDR cells, where they also co-localize with the ganglioside G(M1) located in lipid rafts. The overexpression of the ezrin deletion mutant entirely restored drug susceptibility of osteosarcoma cells, consistent with Pgp dislocation to cytoplasmic compartments and abrogation of G(M1) /Pgp co-localization at the plasma membrane. Our study provides evidence that ezrin exerts a key role in MDR of human osteosarcoma cells through a Pgp-ezrin-actin connection that is instrumental for the permanence of Pgp into plasma membrane lipid rafts. We also show for the first time that Pgp-binding site is localized to amino acid residues 149-242 of the ezrin Band 4.1, Ezrin/Radixin/Moesin (FERM) domain, thus proposing a specific target for future molecular therapy aimed at counteracting MDR in osteosarcoma patients.
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Affiliation(s)
- Daria Brambilla
- Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
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15
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Neisch AL, Fehon RG. Ezrin, Radixin and Moesin: key regulators of membrane-cortex interactions and signaling. Curr Opin Cell Biol 2011; 23:377-82. [PMID: 21592758 DOI: 10.1016/j.ceb.2011.04.011] [Citation(s) in RCA: 201] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 03/23/2011] [Accepted: 04/19/2011] [Indexed: 12/18/2022]
Abstract
The cell cortex serves as a critical nexus between the extracellular environment/cell membrane and the underlying cytoskeleton and cytoplasm. In many cells, the cell cortex is organized and maintained by the Ezrin, Radixin and Moesin (ERM) proteins, which have the ability to interact with both the plasma membrane and filamentous actin. Although this membrane-cytoskeletal linkage function is critical to stability of the cell cortex, recent studies indicate that this is only a part of what ERMs do in many cells. In addition to their role in binding filamentous actin, ERMs regulate signaling pathways through their ability to bind transmembrane receptors and link them to downstream signaling components. In this review we discuss recent evidence in a variety of cells indicating that ERMs serve as scaffolds to facilitate efficient signal transduction on the cytoplasmic face of the plasma membrane.
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Affiliation(s)
- Amanda L Neisch
- Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637, USA
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16
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Abstract
Focal adhesion kinase (FAK) is a scaffold and tyrosine kinase protein that binds to itself and cellular partners through its four-point-one, ezrin, radixin, moesin (FERM) domain. Recent structural work reveals that regulatory protein partners convert auto-inhibited FAK into its active state by binding to its FERM domain. Further, the identity of FAK FERM domain-interacting proteins yields clues as to how FAK coordinates diverse cellular responses, including cell adhesion, polarization, migration, survival and death, and suggests that FERM domains might mediate information transfer between the cell cortex and nucleus. Importantly, the FAK FERM domain might act as a paradigm for the actions of other FERM domain-containing proteins.
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Comparative proteomic analysis of paclitaxel sensitive A549 lung adenocarcinoma cell line and its resistant counterpart A549-Taxol. J Cancer Res Clin Oncol 2010; 137:521-32. [DOI: 10.1007/s00432-010-0913-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Accepted: 05/05/2010] [Indexed: 01/31/2023]
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Lee JH, Yoo JH, Oh SH, Lee KY, Lee KH. Knockdown of moesin expression accelerates cellular senescence of human dermal microvascular endothelial cells. Yonsei Med J 2010; 51:438-47. [PMID: 20376899 PMCID: PMC2852802 DOI: 10.3349/ymj.2010.51.3.438] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Endothelial cells maintain the homeostasis of blood, which consists of plasma and cellular components, and regulate the interaction between blood and the surrounding tissues. They also have essential roles in vascular permeability, the circulation, coagulation, inflammation, wound healing, and tissue growth. The senescence of endothelial cells is closely related to the aging of the adjacent tissues and to age-related vascular disease. Recently, the expression of moesin was found to be decreased in elderly human dermal microvascular endothelial cells (HDMECs), and an association between moesin and senescence has been suggested. This study examined the functional role of moesin in cellular senescence. MATERIALS AND METHODS To study the effects of decreased moesin expression on cellular senescence and metabolism, HDMECs were transfected with short hairpin-RNA (shRNA) lentivirus to silence moesin gene expression. In addition, specimens from young and old human skin were stained with antimoesin and anti-p16 antibodies as an in vivo study. RESULTS Using shRNAlentivirus, moesin knock-down HDMECs developed characteristics associated with aging and expressed senescence associated-beta-galactosidase during early passages. They also showed increased p16 expression, decreased metabolic activity, and cell growth retardation. Human skin tissue from elderly persons showed decreased moesin expression and increased p16 expression. CONCLUSION These findings suggest that there is a functional association between moesin expression and cellular senescence. Further study of the functional mechanism of moesin in the cytoskeleton and cellular senescence is needed. In addition, this study provides a useful model for developing anti-aging treatments.
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Affiliation(s)
- Ju Hee Lee
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Jung Hoan Yoo
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Sang Ho Oh
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Kyu-Yeop Lee
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Kwang Hoon Lee
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
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Cisplatin-induced apoptosis involves a Fas-ROCK-ezrin-dependent actin remodelling in human colon cancer cells. Eur J Cancer 2010; 46:1445-55. [PMID: 20202822 DOI: 10.1016/j.ejca.2010.01.034] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Revised: 01/20/2010] [Accepted: 01/26/2010] [Indexed: 11/23/2022]
Abstract
In human colon cancer cells, cisplatin-induced apoptosis involves the Fas death receptor pathway independent of Fas ligand. The present study explores the role of ezrin and actin cytoskeleton in relation with Fas receptor in this cell death pathway. In response to cisplatin treatment, a rapid and transient actin reorganisation is observed at the cell membrane by fluorescence microscopy after Phalloidin-FITC staining. This event is dependent on the membrane fluidification studied by electron paramagnetic resonance and necessary for apoptosis induction. Moreover, early after the onset of cisplatin treatment, ezrin co-localised with Fas at the cell membrane was visualised by membrane microscopy and was redistributed with Fas, FADD and procaspase-8 into membrane lipid rafts as shown on Western blots. In fact, cisplatin exposure results in an early small GTPase RhoA activation demonstrated by RhoA-GTP pull down, Rho kinase (ROCK)-dependent ezrin phosphorylation and actin microfilaments remodelling. Pretreatment with latrunculin A, an inhibitor of actin polymerisation, or specific extinction of ezrin or ROCK by RNA interference prevents both cisplatin-induced actin reorganisation and apoptosis. Interestingly, specific extinction of Fas receptor by RNA interference abrogates cisplatin-induced ROCK-dependent ezrin phosphorylation, actin reorganisation and apoptosis suggesting that Fas is a key regulator of cisplatin-induced actin remodelling and is indispensable for apoptosis. Thus, these findings show for the first time that phosphorylation of ezrin by ROCK via Fas receptor is involved in the early steps of cisplatin-induced apoptosis.
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20
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Moulding the shape of a metastatic cell. Leuk Res 2010; 34:843-7. [PMID: 20189645 DOI: 10.1016/j.leukres.2010.02.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Revised: 02/06/2010] [Accepted: 02/07/2010] [Indexed: 11/23/2022]
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21
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Brambilla D, Fais S. The Janus-faced role of ezrin in "linking" cells to either normal or metastatic phenotype. Int J Cancer 2009; 125:2239-45. [PMID: 19588507 DOI: 10.1002/ijc.24734] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In the majority of eukaryotic cells, the ezrin, radixin and moesin (ERM) proteins are involved in many physiologic functions including regulation of actin cytoskeleton, control of cell shape, adhesion, motility and modulation of signal transduction pathways. In a previous study, we used a dominant negative ezrin-mutant to address ezrin involvement in remodeling of actin cytoskeleton and subsequently we depicted ezrin key role in melanoma cell migration and progression. Herein, we highlight recent advances on ezrin involvement in the metastatic phenomenon, including also some more neglected ezrin-related functions. Novel molecular processes driven by ezrin activation include: phagocytosis, acquisition of resistance to chemotherapeutics and triggering of programmed cell death signals. Recent data support an integrated role of ezrin also in development of tumor malignancy. On one hand, ezrin may be responsible of deranged execution of specific known functions such as adhesion and motility and on the other, it may also participate to unique metastatic determinants, through the establishment of aberrant linkages with tumor-related proteins. For instance, ezrin misslocalization, absence or deranged activity has started to be correlated with tumor progression in many tumors of different species, including humans. Concomitantly, ezrin may act simultaneously as a regulatory or deregulatory chaperon in both normal and tumor cells. It is still to be established whether this Janus-faced feature of ezrin is due to some unknown transforming Zelig-like property or to the fact that a tumor-associated molecule preferentially links to ezrin thus distracting it from its normal connections. However, the contribution of ezrin functional deregulation to the acquisition of the metastatic phenotype appears clear and ezrin or ezrin aberrant associations may represent good candidates for future anti-tumor therapies.
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Affiliation(s)
- Daria Brambilla
- Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità, Viale Regina Elena, Rome, Italy
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22
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Wang HJ, Zhu JS, Zhang Q, Guo H, Dai YH, Xiong XP. RNAi-mediated silencing of ezrin gene reverses malignant behavior of human gastric cancer cell line SGC-7901. J Dig Dis 2009; 10:258-64. [PMID: 19906104 DOI: 10.1111/j.1751-2980.2009.00394.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE To investigate the effects of ezrin targeting gene of RNA interference (RNAi) on human gastric cancer cell line SGC-7901 in vitro. METHODS The highly metastatic human gastric cancer cell line SGC-7901 transfected with a small interfering (siRNA) lentivirus vector was selected for this research study. Expressions of ezrin mRNA and ezrin protein in the SGC-7901 cells were detected using RT-PCR and Western blot. Cell apoptosis was observed using flow cytometry. Transwell invasion and the cell adhesion test were used to verify the effect of RNAi on ezrin expression in the human gastric cancer cell line SGC-7901 in vitro. RESULTS Ezrin gene targeting via a RNAi-mediated lentivirus vector had obvious inhibitory effects on ezrin expression in the human gastric cancer cell line SGC-7901. The results of the RT-PCR show the obvious inhibition of ezrin mRNA expression in Eai and Ebi groups (0.22 +/- 0.01 vs 0.95 +/- 0.04, P < 0.05; 0.31 +/- 0.01 vs. 0.95 +/- 0.04, P < 0.05). Western blot analysis revealed a 72.35 +/- 3.74% reduction of the ezrin protein level after interference with the ezrin targeting gene. Moreover, the inhibition of ezrin expression clearly inhibited SGC-7901 cell migration and invasion, and improved cell adhesion as well as increased sensitivity to camptothecin-induced apoptosis. CONCLUSION Ezrin gene targeting by RNAi can inhibit the metastatic growth and migration of SGC-7901 human gastric cancer cells.
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Affiliation(s)
- Hong Jian Wang
- Department of Gastroenterology, Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai, China
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23
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Lee JH, Hong IA, Oh SH, Kwon YS, Cho SH, Lee KH. The effect of moesin overexpression on ageing of human dermal microvascular endothelial cells. Exp Dermatol 2009; 18:997-9. [DOI: 10.1111/j.1600-0625.2009.00898.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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24
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Wang HJ, Zhu JS, Zhang Q, Sun Q, Guo H. High level of ezrin expression in colorectal cancer tissues is closely related to tumor malignancy. World J Gastroenterol 2009; 15:2016-9. [PMID: 19399936 PMCID: PMC2675094 DOI: 10.3748/wjg.15.2016] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the ezrin expression in normal colorectal mucosa and colorectal cancer tissues, and study the correlation between ezrin expression in colorectal cancer tissues and tumor invasion and metastasis.
METHODS: Eighty paraffin-embedded cancer tissue samples were selected from primary colorectal adenocarcinoma. Twenty-eight patients had well-differentiated, 22 had moderately differentiated and 30 had poorly differentiated adenocarcinoma. Forty-five patients and 35 patients had lymph node metastasis. Forty-five patients were of Dukes A to B stage, and 35 were of C to D stage. Another 22 paraffin-embedded tissue blocks of normal colorectal epithelium (> 5 cm away from the edge of the tumor) were selected as the control group. All patients with colorectal cancer were treated surgically and diagnosed histologically, without preoperative chemotherapy or radiotherapy. The immunohistochemistry was used to detect the ezrin expression in paraffin-embedded normal colorectal mucosa tissues and colorectal cancer tissue samples.
RESULTS: Ezrin expression in colorectal cancer was significantly higher than in normal colorectal mucosa (75.00% vs 9.09%, P < 0.01), and there was a close relationship between ezrin expression and the degree of tumor differentiation, lymph node metastasis and Dukes stage (88.46% vs 50.00%, P < 0.01; 94.28% vs 51.11%, P < 0.01; 94.28% vs 51.11%, P < 0.01).
CONCLUSION: Ezrin expression is obviously higher in colorectal cancer tissues than in normal colorectal mucosa tissues, and the high level of ezrin expression is closely related to the colorectal cancer invasion and metastasis process.
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25
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A role for actin in regulating apoptosis/programmed cell death: evidence spanning yeast, plants and animals. Biochem J 2008; 413:389-404. [PMID: 18613816 DOI: 10.1042/bj20080320] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Achieving an understanding of how apoptosis/PCD (programmed cell death) is integrated within cellular responses to environmental and intracellular signals is a daunting task. From the sensation of a stimulus to the point of no return, a programme of cell death must engage specific pro-death components, whose effects can in turn be enhanced or repressed by downstream regulatory factors. In recent years, considerable progress has been made in our understanding of how components involved in these processes function. We now know that some of the factors involved in PCD networks have ancient origins that pre-date multicellularity and, indeed, eukaryotes themselves. A subject attracting much attention is the role that the actin cytoskeleton, itself a cellular component with ancient origins, plays in cell death regulation. Actin, a key cellular component, has an established role as a cellular sensor, with reorganization and alterations in actin dynamics being a well known consequence of signalling. A range of studies have revealed that actin also plays a key role in apoptosis/PCD regulation. Evidence implicating actin as a regulator of eukaryotic cell death has emerged from studies from the Animal, Plant and Fungal Kingdoms. Here we review recent data that provide evidence for an active, functional role for actin in determining whether PCD is triggered and executed, and discuss these findings within the context of regulation of actin dynamics.
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26
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Ruan W, Lee CT, Desbarats J. A novel juxtamembrane domain in tumor necrosis factor receptor superfamily molecules activates Rac1 and controls neurite growth. Mol Biol Cell 2008; 19:3192-202. [PMID: 18508927 DOI: 10.1091/mbc.e08-02-0161] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Members of the tumor necrosis factor receptor (TNFR) superfamily control cell fate determination, including cell death and differentiation. Fas (CD95) is the prototypical "death receptor" of the TNFR superfamily and signals apoptosis through well established pathways. In the adult nervous system, Fas induces apoptosis in the context of neuropathology such as stroke or amyotrophic lateral sclerosis. However, during nervous system development, Fas promotes neurite growth and branching. The molecular mechanisms underlying Fas-induced process formation and branching have remained unknown to date. Here, we define the molecular pathway linking Fas to process growth and branching in cell lines and in developing neurons. We describe a new cytoplasmic membrane proximal domain (MPD) that is essential for Fas-induced process growth and that is conserved in members of the TNFR superfamily. We show that the Fas MPD recruits ezrin, a molecule that links transmembrane proteins to the cytoskeleton, and activates the small GTPase Rac1. Deletion of the MPD, but not the death domain, abolished Rac1 activation and process growth. Furthermore, an ezrin-derived inhibitory peptide prevented Fas-induced neurite growth in primary neurons. Our results define a new domain, topologically and functionally distinct from the death domain, which regulates neuritogenesis via recruitment of ezrin and activation of Rac1.
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Affiliation(s)
- Wenjing Ruan
- Department of Physiology, McGill University, Montréal, Québec H3G 1Y6, Canada
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27
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Fadiel A, Lee HH, Demir N, Richman S, Iwasaki A, Connell K, Naftolin F. Ezrin is a key element in the human vagina. Maturitas 2008; 60:31-41. [PMID: 18486367 DOI: 10.1016/j.maturitas.2008.03.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2007] [Revised: 03/14/2008] [Accepted: 03/17/2008] [Indexed: 12/01/2022]
Abstract
OBJECTIVE The vagina is a complex tubular structure that has reproductive, support and barrier functions. These depend on the cytoarchitecture of the vaginal cells, which is controlled by key proteins. Cytoskeletal proteins determine cell polarity and membrane specializations by integrating the actin cytoskeleton with cell membranes. This integration is the domain of cytoskeletal proteins including the MERM protein family (moesin-ezrin-radixin-Merlin). Nothing is known about the cyto-localization of the MERM's in the vaginal epithelium or how it influences the cytoarchitecture of the vaginal epithelium and stroma. DESIGN Full-thickness human vaginal fornix samples were obtained from 20 normal human specimens obtained at surgery for pelvic relaxation. Light- and electron microscopical immunohistochemistry (IHC) were used to identify and study activation and cellular localization of immuno-reactive-ezrin (ir-ezrin), a prototypical MERM. RESULTS Ir-ezrin was identified in the stratified squamous vaginal epithelium and connective tissue (fibroblasts, blood vessels and leucocytes). "H" scoring indicated that ir-ezrin staining is denser in the vaginal epithelium than in other layers, that the ir-ezrin staining was associated with increased keratinization and with the size of the tight junctions (p<0.01). Both the amounts and localization of ir-ezrin were associated with high levels of estrogen, identified by the menstrual history and keratinization of the superficial vaginal epithelium. The density of stromal ir-ezrin was increased in the presence of dense epithelial keratinization. Immuno-reactive-ezrin staining was most pronounced near the cell membranes of both keratinized and non-keratinized epithelium, indicating that ezrin activation (unfolding and movement to the membrane) had occurred. Ultra-structural examination of the epithelium showed intra-cellular ir-ezrin to be localized to junctional complexes that have been associated with decreased mucosal penetration by microorganisms. Ir-ezrin was widely distributed throughout stromal fibro-muscular cell, vessels and immunocytes. CONCLUSIONS MERM's, represented by ezrin, are widely present in the vaginal wall. This has implications for the strength and resilience of this tubular structure and may be the case in other internal genital tissues. Ezrin's localization and association with cell specializations indicate that in the vagina, as in other tissues, ezrin likely modulates vaginal cell-cell interactions including the changing vaginal cellular interface with the external environment, the regulation of the elasticity of the vagina, and the regulation of microbial and chemical traffic that determine the pH and microbial environment of the vagina. In other work we have shown that ezrin expression is induced by estradiol. The increase of ir-ezrin staining during the appearance of keratinization and maturation of the vaginal cytology indicates that estrogen may regulate vaginal ezrin and thereby the properties of the vaginal wall and epithelium.
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Affiliation(s)
- A Fadiel
- Department of Obstetrics and Gynecology, New York University, 550 First Avenue, TH528, New York, NY 10016, United States
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Petrovas C, Mueller YM, Yang G, Altork SR, Jacobson JM, Pitsakis PG, Mounzer KC, Altman JD, Katsikis PD. Actin integrity is indispensable for CD95/Fas-induced apoptosis of HIV-specific CD8+ T cells. Apoptosis 2008; 12:2175-86. [PMID: 17891455 DOI: 10.1007/s10495-007-0128-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
We have recently provided data suggesting a potential role for mitochondria and Bcl-2-family molecules in apoptosis sensitivity of HIV-specific CD8+ T cells. Here, we report on the role of filamentous (F) actin in this process. Disruption of actin by cytochalasin D (cytD) or lantrunculin A remarkably reduced CD95/Fas-induced apoptosis of HIV-specific CD8+ T cells while their spontaneous apoptosis was unaffected. This inhibition cannot be attributed to changes of CD95/Fas distribution or levels in these cells. Furthermore, cytD treatment reduced CD95/Fas-induced apoptosis of CD8+ T cells from HIV+ patients independently of their differentiation status. CD95/Fas-induced apoptosis of both CD38+ and CD38- HIV-specific CD8+ T cells was inhibited by cytD treatment indicating that actin mediates this apoptotic process independently of the activation level of these cells. CytD was found to reduce the activation of caspase-8 induced by short treatment of purified CD8+ T cells from HIV+ patients with anti-CD95/Fas. Our data reveal actin as a critical mediator of HIV-specific CD8+ T cell apoptosis; further analysis of the molecular mechanisms governing this process may potentially contribute to design new therapies targeting the enhancement of the immune system in HIV infection.
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Affiliation(s)
- Constantinos Petrovas
- Department of Microbiology and Immunology, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Drexel University, 2900 Queen Lane, Philadelphia, PA 19129, USA
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29
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Mielgo A, Brondani V, Landmann L, Glaser-Ruhm A, Erb P, Stupack D, Günthert U. The CD44 standard/ezrin complex regulates Fas-mediated apoptosis in Jurkat cells. Apoptosis 2007; 12:2051-61. [PMID: 17726647 DOI: 10.1007/s10495-007-0115-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The transmembrane receptor CD44 conveys important signals from the extracellular microenvironment to the cytoplasm, a phenomena known as "outside-in" signaling. CD44 exists as several isoforms that result from alternative splicing, which differ only in the extracellular domain but yet exhibit different activities. CD44 is a binding partner for the membrane-cytoskeleton cross-linker protein ezrin. In this study, we demonstrate that only CD44 standard (CD44s) colocalizes and interacts with the actin cross-linkers ezrin and moesin using well-characterized cell lines engineered to express different CD44 isoforms. Importantly, we also show that the association CD44s-ezrin-actin is an important modulator of Fas-mediated apoptosis. The results highlight a mechanism by which signals from the extracellular milieu regulate intracellular signaling activities involved in programmed cell death.
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Affiliation(s)
- Ainhoa Mielgo
- Institute of Medical Microbiology, Department of Clinical and Biological Sciences, University of Basel, Petersplatz 10, 4003 Basel, Switzerland
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30
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Fais S. Cannibalism: A way to feed on metastatic tumors. Cancer Lett 2007; 258:155-64. [DOI: 10.1016/j.canlet.2007.09.014] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2007] [Revised: 09/10/2007] [Accepted: 09/11/2007] [Indexed: 01/22/2023]
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31
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Ogino W, Takeshima Y, Mori T, Yanai T, Hayakawa A, Akisue T, Kurosaka M, Matsuo M. High level of ezrin mRNA expression in an osteosarcoma biopsy sample with lung metastasis. J Pediatr Hematol Oncol 2007; 29:435-9. [PMID: 17609619 DOI: 10.1097/mph.0b013e3180640d18] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Osteosarcoma (OS) remains a life-threatening malignancy and its molecular character is not fully understood. Ezrin is a cytoskeleton linker protein involved in regulating the growth and metastatic capacity of cancer cells. However, the correlation between ezrin mRNA expression and clinical severity has not yet been examined in OS biopsy samples. Furthermore, recent evidence has demonstrated that the level of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) expression is increased in human cancers of various origins, but this has not yet been examined in OS cells. To clarify the correlation between the clinical severity and the levels of ezrin and GAPDH mRNA expression, we quantified these mRNA levels in 4 pediatric OS biopsy samples using real-time quantitative polymerase chain reaction. Among these 4 samples, ezrin mRNA expression was approximately 5-fold higher in a case with lung metastasis compared with the other cases without metastasis, suggesting an association between the ezrin mRNA expression level and metastasis. On the other hand, the GAPDH mRNA expression level was not related to the clinical severity. This is the first report to demonstrate a high level of ezrin mRNA expression in an OS biopsy sample with lung metastasis.
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Affiliation(s)
- Wakako Ogino
- Department of Pediatric, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, Japan
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32
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Fluur C, De Milito A, Fry TJ, Vivar N, Eidsmo L, Atlas A, Federici C, Matarrese P, Logozzi M, Rajnavölgyi E, Mackall CL, Fais S, Chiodi F, Rethi B. Potential Role for IL-7 in Fas-Mediated T Cell Apoptosis During HIV Infection. THE JOURNAL OF IMMUNOLOGY 2007; 178:5340-50. [PMID: 17404319 DOI: 10.4049/jimmunol.178.8.5340] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
IL-7 promotes survival of resting T lymphocytes and induces T cell proliferation in lymphopenic conditions. As elevated IL-7 levels occur in HIV-infected individuals in addition to high Fas expression on T cells and increased sensitivity to Fas-induced apoptosis, we analyzed whether IL-7 has a regulatory role in Fas-mediated T cell apoptosis. We show that IL-7 up-regulates Fas expression on naive and memory T cells through a mechanism that involves translocation of Fas molecules from intracellular compartments to the cell membrane. IL-7 induced the association of Fas with the cytoskeletal component ezrin and a polarized Fas expression on the cell surface. The potential role of IL-7 in Fas up-regulation in vivo was verified in IL-7-treated macaques and in HIV-infected or chemotherapy treated patients by the correlation between serum IL-7 levels and Fas expression on T cells. IL-7 treatment primed T cells for Fas-induced apoptosis in vitro and serum IL-7 levels correlated with the sensitivity of T cells to Fas-induced apoptosis in HIV-infected individuals. Our data suggest an important role for IL-7 in Fas-mediated regulation of T cell homeostasis. Elevated IL-7 levels associated with lymphopenic conditions, including HIV-infection, might participate in the increased sensitivity of T cells for activation-induced apoptosis.
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Affiliation(s)
- Caroline Fluur
- Department of Microbiology and Tumor Biology Center, Karolinska Institutet, Stockholm, Sweden
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González-Santiago L, Alfonso P, Suárez Y, Núñez A, García-Fernández LF, Alvarez E, Muñoz A, Casal JI. Proteomic Analysis of the Resistance to Aplidin in Human Cancer Cells. J Proteome Res 2007; 6:1286-94. [PMID: 17338558 DOI: 10.1021/pr060430+] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aplidin (plitidepsin) is an antitumoral agent that induces apoptosis via Rac1-JNK activation. A proteomic approach using 2D-DIGE technology found 52 cytosolic and 39 membrane proteins differentially expressed in wild-type and Aplidin-resistant HeLa cells, of which 39 and 27 were identified by MALDI-TOF mass spectrometry and database interrogation. A number of proteins involved in apoptosis pathways were found to be deregulated. Alterations in Rab geranylgeranyltransferase, protein disulfide isomerase (PDI), cystathionine gamma-lyase, ezrin, and cyclophilin A (CypA) were confirmed by immunoblotting. Moreover, the role of PDI and CypA in Aplidin resistance was functionally confirmed by using the inhibitor bacitracin and overexpression, respectively. These deregulated proteins are candidates to mediate, at least partially, Aplidin action and might provide a route to the cells to escape the induction of apoptosis by this drug.
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Affiliation(s)
- Laura González-Santiago
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Arturo Duperier, 4, E-28029 Madrid, Spain
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34
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The concentrations of IL-22, sFas and sFasL in HCV, HIV and HCV/HIV infections. HIV & AIDS REVIEW 2007. [DOI: 10.1016/s1730-1270(10)60038-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Chakrabandhu K, Hérincs Z, Huault S, Dost B, Peng L, Conchonaud F, Marguet D, He HT, Hueber AO. Palmitoylation is required for efficient Fas cell death signaling. EMBO J 2006; 26:209-20. [PMID: 17159908 PMCID: PMC1782379 DOI: 10.1038/sj.emboj.7601456] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2006] [Accepted: 09/29/2006] [Indexed: 01/28/2023] Open
Abstract
Localization of the death receptor Fas to specialized membrane microdomains is crucial to Fas-mediated cell death signaling. Here, we report that the post-translational modification of Fas by palmitoylation at the membrane proximal cysteine residue in the cytoplasmic region is the targeting signal for Fas localization to lipid rafts, as demonstrated in both cell-free and living cell systems. Palmitoylation is required for the redistribution of Fas to actin cytoskeleton-linked rafts upon Fas stimulation and for the raft-dependent, ezrin-mediated cytoskeleton association, which is necessary for the efficient Fas receptor internalization, death-inducing signaling complex assembly and subsequent caspase cascade leading to cell death.
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Affiliation(s)
- Krittalak Chakrabandhu
- Equipe labelisée La Ligue, Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Nice, France
| | - Zoltán Hérincs
- Equipe labelisée La Ligue, Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Nice, France
| | - Sébastien Huault
- Equipe labelisée La Ligue, Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Nice, France
| | - Britta Dost
- Equipe labelisée La Ligue, Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Nice, France
| | - Ling Peng
- CNRS UMR 6114, Département de Chimie, Marseille, France
| | - Fabien Conchonaud
- Centre d'Immunologie de Marseille Luminy, Université de la Méditerranée, Marseille, France
- INSERM, UMR 631, Marseille, France
- CNRS, UMR 6102, Marseille, France
| | - Didier Marguet
- Centre d'Immunologie de Marseille Luminy, Université de la Méditerranée, Marseille, France
- INSERM, UMR 631, Marseille, France
- CNRS, UMR 6102, Marseille, France
| | - Hai-Tao He
- Centre d'Immunologie de Marseille Luminy, Université de la Méditerranée, Marseille, France
- INSERM, UMR 631, Marseille, France
- CNRS, UMR 6102, Marseille, France
| | - Anne-Odile Hueber
- Equipe labelisée La Ligue, Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Nice, France
- Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Centre A Lacassagne, 33, Avenue de Valombrose, 06189 Nice, France. Tel.: +33 492 031241; Fax: +33 492 031245; E-mail:
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Lapinski TW, Jaroszewicz J, Wiercinska-Drapalo A. Concentrations of soluble Fas and soluble Fas ligand as indicators of programmed cell death among patients coinfected with Human Immunodeficiency Virus and Hepatitis C Virus. Viral Immunol 2006; 19:570-5. [PMID: 16987075 DOI: 10.1089/vim.2006.19.570] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Hepatitis C Virus (HCV) and Human Immunodeficiency Virus (HIV) coinfections can affect mechanisms of programmed cell death and therefore influence acquired immunodeficiency syndrome (AIDS) development as well as the course of chronic hepatitis C. The aim of the study was to assess soluble Fas (sFas) and soluble Fas ligand (sFasL) concentrations in HIV- and HCV-coinfected patients and, moreover, to establish their relationships with HIV viral load, CD4+ T lymphocyte count, as well as liver function tests. Seventy-eight patients were included in the study, among them 30 coinfected with HIV and HCV, 10 infected only with HIV, and 38 infected only with HCV. HIV infection was confirmed by means of Western blot analysis; HIV viral load was measured by RTPCR; and CD3+, CD4+, and CD8+ T lymphocyte counts were established by means of flow cytometry. HCV infection was confirmed through HCV RNA isolation, using RT-PCR. sFas and sFasL concentrations were measured in duplicate by ELISA. The mean CD4+ T lymphocyte count decreased in HIV- and HCV-coinfected patients versus HIV-infected individuals (429 versus 279/ml). sFasL protein was detectable principally in HIV-infected individuals without HCV infection (90%), whereas in those with HCV infection it occurred only in 11% of cases. The highest sFas concentration was observed in HCV-infected patients (25.9 ng/ml) as well as in HIV- and HCV-coinfected individuals (20.3 ng/ml). This concentration was negatively proportional to sFasL prevalence. The results of our study suggest that HCV infection in HIV-positive individuals may suppress processes of programmed cell death. There was no correlation between sFas, sFasL, and HIV-1 viral load. On the other hand, sFas concentration and the presence of sFasL were related to CD4+ T lymphocyte count.
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Jasinska A, Strakova Z, Szmidt M, Fazleabas AT. Human chorionic gonadotropin and decidualization in vitro inhibits cytochalasin-D-induced apoptosis in cultured endometrial stromal fibroblasts. Endocrinology 2006; 147:4112-21. [PMID: 16740972 DOI: 10.1210/en.2005-1577] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Endometrial apoptosis increases from the proliferative phase through the secretory phase and peaks at menses. However, with the onset of pregnancy, the corpus luteum is rescued and stromal cells, instead of undergoing apoptosis, reorganize the cytoskeleton and then begin to differentiate. We hypothesized that in the presence of hormones (estradiol-17beta and medroxyprogesterone acetate), chorionic gonadotropin (hCG) as an early embryonic signal, and induction of decidualization by dibutyryl-cAMP (dbcAMP), endometrial stromal cells are rescued by the regulation of proteins that inhibit apoptosis. The percentage of cells stained with annexin V, an early apoptotic marker, increased dramatically after cytoskeletal disruption with cytochalasin D compared with non-cytochalasin-D-treated controls (P < 0.05). However, treatment of cells with hCG or dbcAMP in the presence of hormones significantly (P < 0.05) decreased the percentage of annexin-V-stained cells compared with cells treated with cytochalasin D alone. This inhibition was further confirmed by immunodetection of cleaved caspase-3 and terminal deoxynucleotidyl transferase dUTP nick end labeling staining. The inhibition of apoptosis by hCG and dbcAMP was via the intrinsic pathway because the cytochalasin-D-treated cells stained intensely for Bax, whereas the cells treated with hormones, hCG, or dbcAMP stained predominantly for Bcl-2. Treatment of cytochalasin-D-treated cells with hormones and dbcAMP resulted in an increase in the secretion of IGF-binding protein-1 (IGFBP-1) and prolactin. Treatment of cytochalasin-D-treated cells with recombinant IGFBP-1 and prolactin also inhibited apoptosis. These data suggest that under in vitro conditions, both hCG and the induction of decidualization play a direct role in preventing uterine stromal cells from undergoing apoptosis. Furthermore, this inhibition of apoptosis may be mediated in part by IGFBP-1 and prolactin and the alteration in the expression of Bcl-2 and Bax.
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Affiliation(s)
- Anna Jasinska
- Department of Obstetrics and Gynecology, University of Illinois, 820 South Wood Street, M/C 808, Chicago, Illinois 60612-7313, USA
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Malissein E, Verdier M, Ratinaud MH, Troutaud D. Activation of Bad trafficking is involved in the BCR-mediated apoptosis of immature B cells. Apoptosis 2006; 11:1003-12. [PMID: 16763785 DOI: 10.1007/s10495-006-6713-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The activity of Bad, a pro-apoptotic protein, is regulated by reversible phosphorylation. Moreover, sequestration of Bad within subcellular compartments may be a new mechanism of apoptosis regulation. In this study, we report that Bad interacts with 14-3-3 protein in WEHI-231 immature B cells. This association is disrupted following BCR stimulation in correlation with Bad translocation to mitochondria and apoptosis. Confocal microscopy was further used to examine the co-localization of Bad with lipid rafts in WEHI-231 and murineex vivoB cells. Bad was found colocalized to lipid rafts in freshly isolated mature B lymphocytes, in contrast to immature cells. Finally, co-immunoprecipitation experiments performed on WEHI-231 B cells revealed that PP1alpha interacts with Bcl-2 and Bad, and dissociation of the complex was found correlated with appearance of apoptosis. Bcl-2 seemed to be required to assemble the complex which may regulate Bad phosphorylation status and consequently cell survival. Collectively, present data outline the role of Bad trafficking in the BCR-mediated apoptosis and suggest that differences in intracellular Bad trafficking may be involved in the differential outcome of BCR signaling.
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Affiliation(s)
- E Malissein
- EA 3842, "Homéostasie Cellulaire & Pathologies," Limoges, France
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