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Inoue E, Yamashita A, Inoue H, Sekiguchi M, Shiratori A, Yamamoto Y, Tadokoro T, Ishimi Y, Yamauchi J. Identification of glucose transporter 4 knockdown-dependent transcriptional activation element on the retinol binding protein 4 gene promoter and requirement of the 20 S proteasome subunit for transcriptional activity. J Biol Chem 2010; 285:25545-53. [PMID: 20530491 PMCID: PMC2919119 DOI: 10.1074/jbc.m109.079152] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2009] [Revised: 05/12/2010] [Indexed: 01/27/2023] Open
Abstract
Retinol binding protein 4 (RBP4) is the transport protein that carries retinol in blood. RBP4 was described recently as a new adipokine that reduced insulin sensitivity. Mice lacking glucose transporter 4 (GLUT4) in adipocytes have enhanced Rbp4 gene expression; however, the molecular mechanism is unknown. We found a G4KA (GLUT4 knockdown-dependent transcriptional activation) element located approximately 1.3 kb upstream of the Rbp4 promoter. Mutations within the G4KA sequence significantly reduced expression of the Rbp4 promoter-reporter construct in G4KD-L1 (GLUT4 knockdown 3T3-L1) adipocyte cells. In a yeast one-hybrid screen of a G4KD-L1 cell cDNA library, using the G4KA element as bait, we identified subunits of the 20 S proteasome, PSMB1 and PSMA4, as binding partners. In chromatin immunoprecipitation assays, both subunits bound to the G4KA element; however, only PSMB1 was tightly bound in the GLUT4 knockdown model. PSMB1 RNA interference, but not PSMA4, significantly inhibited Rbp4 transcription. Nuclear transportation of PSMB1 was increased in G4KD-L1 cells. These results provide evidence for an exclusive proteasome subunit-related mechanism for transcriptional activation of RBP4 within a GLUT4 knockdown model.
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Affiliation(s)
- Erina Inoue
- From the Nutritional Epidemiology Program and
| | | | - Hirofumi Inoue
- the Department of Applied Biology and Chemistry, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya, Tokyo 156-8502, Japan
| | | | - Asuka Shiratori
- From the Nutritional Epidemiology Program and
- the Department of Applied Biology and Chemistry, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya, Tokyo 156-8502, Japan
| | - Yuji Yamamoto
- the Department of Applied Biology and Chemistry, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya, Tokyo 156-8502, Japan
| | - Tadahiro Tadokoro
- the Department of Applied Biology and Chemistry, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya, Tokyo 156-8502, Japan
| | - Yoshiko Ishimi
- Food Function and Labeling Program, National Institute of Health and Nutrition, 1-23-1 Toyama, Shinjyuku, Tokyo 162-8636, Japan and
| | - Jun Yamauchi
- From the Nutritional Epidemiology Program and
- Food Function and Labeling Program, National Institute of Health and Nutrition, 1-23-1 Toyama, Shinjyuku, Tokyo 162-8636, Japan and
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Mukhopadhyay B, Liu J, Osei-Hyiaman D, Godlewski G, Mukhopadhyay P, Wang L, Jeong WI, Gao B, Duester G, Mackie K, Kojima S, Kunos G. Transcriptional regulation of cannabinoid receptor-1 expression in the liver by retinoic acid acting via retinoic acid receptor-gamma. J Biol Chem 2010; 285:19002-11. [PMID: 20410309 PMCID: PMC2885177 DOI: 10.1074/jbc.m109.068460] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2009] [Revised: 04/19/2010] [Indexed: 11/06/2022] Open
Abstract
Alcoholism can result in fatty liver that can progress to steatohepatitis, cirrhosis, and liver cancer. Mice fed alcohol develop fatty liver through endocannabinoid activation of hepatic CB(1) cannabinoid receptors (CB(1)R), which increases lipogenesis and decreases fatty acid oxidation. Chronic alcohol feeding also up-regulates CB(1)R in hepatocytes in vivo, which could be replicated in vitro by co-culturing control hepatocytes with hepatic stellate cells (HSC) isolated from ethanol-fed mice, implicating HSC-derived mediator(s) in the regulation of hepatic CB(1)R (Jeong, W. I., Osei-Hyiaman, D., Park, O., Liu, J., Bátkai, S., Mukhopadhyay, P., Horiguchi, N., Harvey-White, J., Marsicano, G., Lutz, B., Gao, B., and Kunos, G. (2008) Cell Metab. 7, 227-235). HSC being a rich source of retinoic acid (RA), we tested whether RA and its receptors may regulate CB(1)R expression in cultured mouse hepatocytes. Incubation of hepatocytes with RA or RA receptor (RAR) agonists increased CB(1)R mRNA and protein, the most efficacious being the RARgamma agonist CD437 and the pan-RAR agonist TTNPB. The endocannabinoid 2-arachidonoylglycerol (2-AG) also increased hepatic CB(1)R expression, which was mediated indirectly via RA, because it was absent in hepatocytes from mice lacking retinaldehyde dehydrogenase 1, the enzyme catalyzing the generation of RA from retinaldehyde. The binding of RARgamma to the CB(1)R gene 5' upstream domain in hepatocytes treated with RAR agonists or 2-AG was confirmed by chromatin immunoprecipitation and electrophoretic mobility shift and antibody supershift assays. Finally, TTNPB-induced CB(1)R expression was attenuated by small interfering RNA knockdown of RARgamma in hepatocytes. We conclude that RARgamma regulates CB(1)R expression and is thus involved in the control of hepatic fat metabolism by endocannabinoids.
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Affiliation(s)
- Bani Mukhopadhyay
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Jie Liu
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Douglas Osei-Hyiaman
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Grzegorz Godlewski
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Partha Mukhopadhyay
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Lei Wang
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Won-Il Jeong
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Bin Gao
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
| | - Gregg Duester
- the Sanford-Burnham Medical Research Institute, La Jolla, California 92037
| | - Ken Mackie
- the Gill Center for Biomolecular Science, Indiana University, Bloomington, Indiana 47405, and
| | - Soichi Kojima
- the Molecular Ligand Biology Research Team, Chemical Genomics Research Group, Chemical Biology Department, RIKEN Advanced Science Institute, Saitam 351-0198, Japan
| | - George Kunos
- From the Laboratory of Physiologic Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20892-9413
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3
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Finzi L, Dunlap DD. Single-molecule approaches to probe the structure, kinetics, and thermodynamics of nucleoprotein complexes that regulate transcription. J Biol Chem 2010; 285:18973-8. [PMID: 20382734 PMCID: PMC2885173 DOI: 10.1074/jbc.r109.062612] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Single-molecule experimentation has contributed significantly to our understanding of the mechanics of nucleoprotein complexes that regulate epigenetic switches. In this minireview, we will discuss the application of the tethered-particle motion technique, magnetic tweezers, and atomic force microscopy to (i) directly visualize and thermodynamically characterize DNA loops induced by the lac, gal, and lambda repressors and (ii) understand the mechanistic role of DNA-supercoiling and DNA-bending cofactors in both prokaryotic and eukaryotic systems.
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4
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Singleton C, White GF, Todd JD, Marritt SJ, Cheesman MR, Johnston AWB, Le Brun NE. Heme-responsive DNA binding by the global iron regulator Irr from Rhizobium leguminosarum. J Biol Chem 2010; 285:16023-31. [PMID: 20233710 PMCID: PMC2871471 DOI: 10.1074/jbc.m109.067215] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 03/13/2010] [Indexed: 11/06/2022] Open
Abstract
Heme, a physiologically crucial form of iron, is a cofactor for a very wide range of proteins and enzymes. These include DNA regulatory proteins in which heme is a sensor to which an analyte molecule binds, effecting a change in the DNA binding affinity of the regulator. Given that heme, and more generally iron, must be carefully regulated, it is surprising that there are no examples yet in bacteria in which heme itself is sensed directly by a reversibly binding DNA regulatory protein. Here we show that the Rhizobium leguminosarum global iron regulatory protein Irr, which has many homologues within the alpha-proteobacteria and is a member of the Fur superfamily, binds heme, resulting in a dramatic decrease in affinity between the protein and its cognate, regulatory DNA operator sequence. Spectroscopic studies of wild-type and mutant Irr showed that the principal (but not only) heme-binding site is at a conserved HXH motif, whose substitution led to loss of DNA binding in vitro and of regulatory function in vivo. The R. leguminosarum Irr behaves very differently to the Irr of Bradyrhizobium japonicum, which is rapidly degraded in vivo by an unknown mechanism in conditions of elevated iron or heme, but whose DNA binding affinity in vitro does not respond to heme.
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Affiliation(s)
- Chloe Singleton
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
| | - Gaye F. White
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
- School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - Jonathan D. Todd
- School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - Sophie J. Marritt
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
| | - Myles R. Cheesman
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
| | - Andrew W. B. Johnston
- School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - Nick E. Le Brun
- From the Centre for Molecular and Structural Biochemistry, School of Chemistry, and
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5
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Meloni A, Fiorillo E, Corda D, Incani F, Serra ML, Contini A, Cao A, Rosatelli MC. DAXX is a new AIRE-interacting protein. J Biol Chem 2010; 285:13012-21. [PMID: 20185822 PMCID: PMC2857146 DOI: 10.1074/jbc.m109.037747] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Revised: 02/09/2010] [Indexed: 01/18/2023] Open
Abstract
The AIRE protein plays a remarkable role as a regulator of central tolerance by controlling the promiscuous expression of tissue-specific antigens in thymic medullary epithelial cells. Defects in the AIRE gene cause the autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy, a rare disease frequent in Iranian Jews, Finns, and Sardinian population. To this day, the precise function of the AIRE protein in regulating transcription and its interacting proteins has yet to be entirely clarified. The knowledge of novel AIRE interactors and their precise role will improve our knowledge of its biological activity and address some of the foremost autoimmunity-related questions. In this study, we have used a yeast two-hybrid system to identify AIRE-interacting proteins. This approach led us to the discovery of a new AIRE-interacting protein called DAXX. The protein is known to be a multifunctional adaptor with functions both in apoptosis and in transcription regulation pathways. The interaction between AIRE and DAXX has been validated by in vivo coimmunoprecipitation analysis and colocalization study in mammalian cells. The interaction has been further confirmed by showing in transactivation assays that DAXX exerts a strong repressive role on the transcriptional activity of AIRE.
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Affiliation(s)
- Allesandra Meloni
- From the
Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche and
| | - Edoardo Fiorillo
- the
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Cagliari, 09121 Cagliari, Italy
| | - Denise Corda
- the
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Cagliari, 09121 Cagliari, Italy
| | - Federica Incani
- the
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Cagliari, 09121 Cagliari, Italy
| | - Maria Luisa Serra
- the
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Cagliari, 09121 Cagliari, Italy
| | - Antonella Contini
- the
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Cagliari, 09121 Cagliari, Italy
| | - Antonio Cao
- From the
Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche and
| | - Maria Cristina Rosatelli
- the
Dipartimento di Scienze Biomediche e Biotecnologie, Università degli Studi di Cagliari, 09121 Cagliari, Italy
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6
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Donelan W, Koya V, Li SW, Yang LJ. Distinct regulation of hepatic nuclear factor 1alpha by NKX6.1 in pancreatic beta cells. J Biol Chem 2010; 285:12181-9. [PMID: 20106981 PMCID: PMC2852957 DOI: 10.1074/jbc.m109.064238] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Revised: 01/19/2010] [Indexed: 01/12/2023] Open
Abstract
Hepatic nuclear factor 1alpha (HNF1alpha) is a key regulator of development and function in pancreatic beta cells and is specifically involved in regulation of glycolysis and glucose-stimulated insulin secretion. Abnormal expression of HNF1alpha leads to development of MODY3 (maturity-onset diabetes of the young 3). We report that NK6 homeodomain 1 (NKX6.1) binds to a cis-regulatory element in the HNF1alpha promoter and is a major regulator of this gene in beta cells. We identified an NKX6.1 recognition sequence in the distal region of the HNF1alpha promoter and demonstrated specific binding of NKX6.1 in beta cells by electrophoretic mobility shift and chromatin immunoprecipitation assays. Site-directed mutagenesis of the NKX6.1 core-binding sequence eliminated NKX6.1-mediated activation and substantially decreased activity of the HNF1alpha promoter in beta cells. Overexpression or small interfering RNA-mediated knockdown of the Nkx6.1 gene resulted in increased or diminished HNF1alpha gene expression, respectively, in beta cells. We conclude that NKX6.1 is a novel regulator of HNF1alpha in pancreatic beta cells. This novel regulatory mechanism for HNF1alpha in beta cells may provide new molecular targets for the diagnosis of MODY3.
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Affiliation(s)
- William Donelan
- From the Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida 32610
| | - Vijay Koya
- From the Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida 32610
| | - Shi-Wu Li
- From the Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida 32610
| | - Li-Jun Yang
- From the Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida 32610
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7
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Kiesler P, Haynes PA, Shi L, Kao PN, Wysocki VH, Vercelli D. NF45 and NF90 regulate HS4-dependent interleukin-13 transcription in T cells. J Biol Chem 2010; 285:8256-67. [PMID: 20051514 PMCID: PMC2832977 DOI: 10.1074/jbc.m109.041004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Revised: 12/10/2009] [Indexed: 01/13/2023] Open
Abstract
Expression of the cytokine interleukin-13 (IL13) is critical for Th2 immune responses and Th2-mediated allergic diseases. Activation of human IL13 expression involves chromatin remodeling and formation of multiple DNase I-hypersensitive sites throughout the locus. Among these, HS4 is detected in the distal IL13 promoter in both naive and polarized CD4(+) T cells. We show herein that HS4 acts as a position-independent, orientation-dependent positive regulator of IL13 proximal promoter activity in transiently transfected, activated human CD4(+) Jurkat T cells and primary murine Th2 cells. The 3'-half of HS4 (HS4-3') was responsible for IL13 up-regulation and bound nuclear factor (NF) 90 and NF45, as demonstrated by DNA affinity chromatography coupled with tandem mass spectrometry, chromatin immunoprecipitation, and gel shift analysis. Notably, the CTGTT NF45/NF90-binding motif within HS4-3' was critical for HS4-dependent up-regulation of IL13 expression. Moreover, transfection of HS4-IL13 reporter vectors into primary, in vitro differentiated Th2 cells from wild-type, NF45(+/-), or NF90(+/-) mice showed that HS4 activity was exquisitely dependent on the levels of endogenous NF45 (and to a lesser degree NF90), because HS4-dependent IL13 expression was virtually abrogated in NF45(+/-) cells and reduced in NF90(+/-) cells. Collectively, our results identify NF45 and NF90 as novel regulators of HS4-dependent human IL13 transcription in response to T cell activation.
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Affiliation(s)
- Patricia Kiesler
- From the Functional Genomics Laboratory, Arizona Respiratory Center
| | | | - Lingfang Shi
- the Department of Pulmonary and Critical Care Medicine, Stanford University Medical Center, Stanford, California 94305
| | - Peter N. Kao
- the Department of Pulmonary and Critical Care Medicine, Stanford University Medical Center, Stanford, California 94305
| | | | - Donata Vercelli
- From the Functional Genomics Laboratory, Arizona Respiratory Center
- Cell Biology
- Arizona Center for the Biology of Complex Diseases, and
- The Bio5 Institute, University of Arizona, Tucson, Arizona 85719 and
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8
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Kyriazis GA, Belal C, Madan M, Taylor DG, Wang J, Wei Z, Pattisapu JV, Chan SL. Stress-induced switch in Numb isoforms enhances Notch-dependent expression of subtype-specific transient receptor potential channel. J Biol Chem 2010; 285:6811-25. [PMID: 20038578 PMCID: PMC2825475 DOI: 10.1074/jbc.m109.074690] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2009] [Revised: 12/16/2009] [Indexed: 12/11/2022] Open
Abstract
The Notch signaling pathway plays an essential role in the regulation of cell specification by controlling differentiation, proliferation, and apoptosis. Numb is an intrinsic regulator of the Notch pathway and exists in four alternative splice variants that differ in the length of their phosphotyrosine-binding domain (PTB) and proline-rich region domains. The physiological relevance of the existence of the Numb splice variants and their exact regulation are still poorly understood. We previously reported that Numb switches from isoforms containing the insertion in PTB to isoforms lacking this insertion in neuronal cells subjected to trophic factor withdrawal (TFW). The functional relevance of the TFW-induced switch in Numb isoforms is not known. Here we provide evidence that the TFW-induced switch in Numb isoforms regulates Notch signaling strength and Notch target gene expression. PC12 cells stably overexpressing Numb isoforms lacking the PTB insertion exhibited higher basal Notch activity and Notch-dependent transcription of the transient receptor potential channel 6 (TRPC6) when compared with those overexpressing Numb isoforms with the PTB insertion. The differential regulation of TRPC6 expression is correlated with perturbed calcium signaling and increased neuronal vulnerability to TFW-induced death. Pharmacological inhibition of the Notch pathway or knockdown of TRPC6 function ameliorates the adverse effects caused by the TFW-induced switch in Numb isoforms. Taken together, our results indicate that Notch and Numb interaction may influence the sensitivity of neuronal cells to injurious stimuli by modulating calcium-dependent apoptotic signaling cascades.
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Affiliation(s)
- George A. Kyriazis
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
| | - Cherine Belal
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
| | - Meenu Madan
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
| | - David G. Taylor
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
| | - Jang Wang
- the Division of Pulmonary and Critical Care Medicine, The Johns Hopkins Asthma and Allergy Center, Baltimore, Maryland 21224
| | - Zelan Wei
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
| | - Jogi V. Pattisapu
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
| | - Sic L. Chan
- From the Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32816 and
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9
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Li M, Aliotta JM, Asara JM, Wu Q, Dooner MS, Tucker LD, Wells A, Quesenberry PJ, Ramratnam B. Intercellular transfer of proteins as identified by stable isotope labeling of amino acids in cell culture. J Biol Chem 2010; 285:6285-97. [PMID: 20026604 PMCID: PMC2825424 DOI: 10.1074/jbc.m109.057943] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2009] [Revised: 12/15/2009] [Indexed: 12/24/2022] Open
Abstract
We tracked the extracellular fate of proteins of pulmonary origin using the technique of stable isotope labeling of amino acids in cell culture (SILAC) in cell-impermeable Transwell culture systems. We find that irradiation to murine lung and lung-derived cells induces their release of proteins that are capable of entering neighboring cells, including primary murine bone marrow cells as well as prostate cancer and hematopoietic cell lines. The functional classification of transferred proteins was broad and included transcription factors, mediators of basic cellular processes and components of the nucleosome remodeling and deacetylase complex, including metastasis associated protein 3 and retinoblastoma-binding protein 7. In further analysis we find that retinoblastoma-binding protein 7 is a transcriptional activator of E-cadherin and that its intercellular transfer leads to decreased gene expression of downstream targets such as N-cadherin and vimentin. SILAC-generated data sets offer a valuable tool to identify and validate potential paracrine networks that may impact relevant biologic processes associated with phenotypic and genotypic signatures of health and disease.
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Affiliation(s)
- Ming Li
- From the Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, The Warren Alpert Medical School of Brown University, and
| | - Jason M. Aliotta
- the Division of Hematology and Oncology, Department of Medicine, Rhode Island Hospital, and The Warren Alpert Medical School of Brown University, Providence, Rhode Island 02903
| | - John M. Asara
- the Mass Spectrometry Core, Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, Massachusetts 02215, and
| | - Qian Wu
- the Department of Pathology, Pittsburgh Veterans Administration Medical Center, and University of Pittsburgh, Pittsburgh, Pennsylvania 15219
| | - Mark S. Dooner
- the Division of Hematology and Oncology, Department of Medicine, Rhode Island Hospital, and The Warren Alpert Medical School of Brown University, Providence, Rhode Island 02903
| | - Lynne D. Tucker
- From the Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, The Warren Alpert Medical School of Brown University, and
| | - Alan Wells
- the Department of Pathology, Pittsburgh Veterans Administration Medical Center, and University of Pittsburgh, Pittsburgh, Pennsylvania 15219
| | - Peter J. Quesenberry
- the Division of Hematology and Oncology, Department of Medicine, Rhode Island Hospital, and The Warren Alpert Medical School of Brown University, Providence, Rhode Island 02903
| | - Bharat Ramratnam
- From the Laboratory of Retrovirology, Division of Infectious Diseases, Department of Medicine, The Warren Alpert Medical School of Brown University, and
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10
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Latré de Laté P, Pépin A, Assaf-Vandecasteele H, Espinasse C, Nicolas V, Asselin-Labat ML, Bertoglio J, Pallardy M, Biola-Vidamment A. Glucocorticoid-induced leucine zipper (GILZ) promotes the nuclear exclusion of FOXO3 in a Crm1-dependent manner. J Biol Chem 2010; 285:5594-605. [PMID: 20018851 PMCID: PMC2820786 DOI: 10.1074/jbc.m109.068346] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 12/03/2009] [Indexed: 12/14/2022] Open
Abstract
GILZ (glucocorticoid-induced leucine zipper) is an ubiquitous protein whose expression is induced by glucocorticoids in lymphoid cells. We previously showed that GILZ expression is rapidly induced upon interleukin 2 deprivation in T-cells, protecting cells from apoptosis induced by forkhead box subgroup O3 (FOXO3). The aim of this work is to elucidate the molecular mechanism of FOXO factor inhibition by GILZ. We show in the myeloid cell line HL-60 and the lymphoid CTLL-2 T-cell line that GILZ down-regulates the expression of p27(KIP1) and Bim, two FOXO targets involved in cell cycle regulation and apoptosis, respectively. GILZ inhibits FOXO1, FOXO3, and FOXO4 transcriptional activities measured with natural or synthetic FOXO-responsive promoters in HL-60 cells. This inhibitory effect is independent of protein kinase B and IkappaB kinase phosphorylation sites. GILZ does not hinder FOXO3 DNA-binding activity and does not physically interact with FOXO3. However, using fluorescence microscopy, we observe that GILZ expression provokes a Crm-1-dependent nuclear exclusion of FOXO3 leading to its relocalization to the cytoplasm. Moreover, GILZ exclusive cytoplasmic localization is a prerequisite for FOXO3 inhibition and relocalization. We propose that GILZ is a general inhibitor of FOXO factors acting through an original mechanism by preventing them from reaching target genes within the nucleus.
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Affiliation(s)
- Perle Latré de Laté
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Aurélie Pépin
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Hind Assaf-Vandecasteele
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Christophe Espinasse
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Valérie Nicolas
- the Plate-Forme Imagerie Cellulaire, IFR141-ITFM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France
| | - Marie-Liesse Asselin-Labat
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Jacques Bertoglio
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Marc Pallardy
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
| | - Armelle Biola-Vidamment
- From the Université Paris Sud, INSERM UMR-S 749, Faculté de Pharmacie, and INSERM, Université Paris-Sud 11, 92296 Châtenay-Malabry, France and
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