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2. Differential gene expression profiling of human bone marrow-derived mesenchymal stem cells during adipogenic development

Author

Menssen Adriane, Häupl Thomas, Sittinger Michael, Delorme Bruno, Charbord Pierre, and Ringe Jochen

Subjects
Biotechnology, TP248.13-248.65, Genetics, QH426-470
Abstract

Abstract Background Adipogenesis is the developmental process by which mesenchymal stem cells (MSC) differentiate into pre-adipocytes and adipocytes. The aim of the study was to analyze the developmental strategies of human bone marrow MSC developing into adipocytes over a defined time scale. Here we were particularly interested in differentially expressed transcription factors and biochemical pathways. We studied genome-wide gene expression profiling of human MSC based on an adipogenic differentiation experiment with five different time points (day 0, 1, 3, 7 and 17), which was designed and performed in reference to human fat tissue. For data processing and selection of adipogenic candidate genes, we used the online database SiPaGene for Affymetrix microarray expression data. Results The mesenchymal stem cell character of human MSC cultures was proven by cell morphology, by flow cytometry analysis and by the ability of the cells to develop into the osteo-, chondro- and adipogenic lineage. Moreover we were able to detect 184 adipogenic candidate genes (85 with increased, 99 with decreased expression) that were differentially expressed during adipogenic development of MSC and/or between MSC and fat tissue in a highly significant way (p < 0.00001). Subsequently, groups of up- or down-regulated genes were formed and analyzed with biochemical and cluster tools. Among the 184 genes, we identified already known transcription factors such as PPARG, C/EBPA and RTXA. Several of the genes could be linked to corresponding biochemical pathways like the adipocyte differentiation, adipocytokine signalling, and lipogenesis pathways. We also identified new candidate genes possibly related to adipogenesis, such as SCARA5, coding for a receptor with a putative transmembrane domain and a collagen-like domain, and MRAP, encoding an endoplasmatic reticulum protein. Conclusions Comparing differential gene expression profiles of human MSC and native fat cells or tissue allowed us to establish a comprehensive differential kinetic gene expression network of adipogenesis. Based on this, we identified known and unknown genes and biochemical pathways that may be relevant for adipogenic differentiation. Our results encourage further and more focused studies on the functional relevance of particular adipogenic candidate genes.

Published
2011
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3. Influence of hypoxia on the domiciliation of Mesenchymal Stem Cells after infusion into rats: possibilities of targeting pulmonary artery remodeling via cells therapies?

Author

Domenech Jorge, Pages Jean-Christophe, Bonnet Nicolas, Vaudin Pascal, Rochefort Gaël Y, Charbord Pierre, and Eder Véronique

Subjects
arteries, hypertension, pulmonary, hypoxia, lung, remodeling, mesenchymal stem cells., Diseases of the respiratory system, RC705-779
Abstract

Abstract Background Bone marrow (BM) cells are promising tools for vascular therapies. Here, we focused on the possibility of targeting the hypoxia-induced pulmonary artery hypertension remodeling with systemic delivery of BM-derived mesenchymal stem cells (MSCs) into non-irradiated rats. Methods Six-week-old Wistar rats were exposed to 3-week chronic hypoxia leading to pulmonary artery wall remodeling. Domiciliation of adhesive BM-derived CD45- CD73+ CD90+ MSCs was first studied after a single intravenous infusion of Indium-111-labeled MSCs followed by whole body scintigraphies and autoradiographies of different harvested organs. In a second set of experiments, enhanced-GFP labeling allowed to observe distribution at later times using sequential infusions during the 3-week hypoxia exposure. Results A 30% pulmonary retention was observed by scintigraphies and no differences were observed in the global repartition between hypoxic and control groups. Intrapulmonary radioactivity repartition was homogenous in both groups, as shown by autoradiographies. BM-derived GFP-labeled MSCs were observed with a global repartition in liver, in spleen, in lung parenchyma and rarely in the adventitial layer of remodeled vessels. Furthermore this global repartition was not modified by hypoxia. Interestingly, these cells displayed in vivo bone marrow homing, proving a preservation of their viability and function. Bone marrow homing of GFP-labeled MSCs was increased in the hypoxic group. Conclusion Adhesive BM-derived CD45- CD73+ CD90+ MSCs are not integrated in the pulmonary arteries remodeled media after repeated intravenous infusions in contrast to previously described in systemic vascular remodeling or with endothelial progenitor cells infusions.

Published
2005
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6. The EHA Research Roadmap: Normal Hematopoiesis

Author

Thierry Jaffredo, Alessandra Balduini, Anna Bigas, Rosa Bernardi, Dominique Bonnet, Bruno Canque, Pierre Charbord, Anna Cumano, Ruud Delwel, Charles Durand, Willem Fibbe, Lesley Forrester, Lucia de Franceschi, Cedric Ghevaert, Bjørn Gjertsen, Berthold Gottgens, Thomas Graf, Olaf Heidenreich, Olivier Hermine, Douglas Higgs, Marina Kleanthous, Hannes Klump, Valerie Kouskoff, Daniela Krause, George Lacaud, Cristina Lo Celso, Joost H.A. Martens, Simón Méndez-Ferrer, Pablo Menendez, Robert Oostendorp, Sjaak Philipsen, Bo Porse, Marc Raaijmakers, Catherine Robin, Henk Stunnenberg, Kim Theilgaard-Mönch, Ivo Touw, William Vainchenker, Joan-Lluis Vives Corrons, Laurent Yvernogeau, and Jan Jacob Schuringa

Subjects
Diseases of the blood and blood-forming organs, RC633-647.5
Published
2021
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8. Notch ligand Dll4 impairs cell recruitment to aortic clusters and limits blood stem cell generation

Author

Porcheri, Cristina, Golan, Ohad, Calero‐Nieto, Fernando J, Thambyrajah, Roshana, Ruiz‐Herguido, Cristina, Wang, Xiaonan, Catto, Francesca, Guillén, Yolanda, Sinha, Roshani, González, Jessica, Kinston, Sarah J, Mariani, Samanta A, Maglitto, Antonio, Vink, Chris S, Dzierzak, Elaine, Charbord, Pierre, Göttgens, Bertie, Espinosa, Lluis, Sprinzak, David, and Bigas, Anna

Published
2020
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9. Nidogen-1 Contributes to the Interaction Network Involved in Pro-B Cell Retention in the Peri-sinusoidal Hematopoietic Stem Cell Niche

Author

Marielle Balzano, Maria De Grandis, Thien-Phong Vu Manh, Lionel Chasson, Florence Bardin, Anne Farina, Arnauld Sergé, Ghislain Bidaut, Pierre Charbord, Léonard Hérault, Anne-Laure Bailly, Amandine Cartier-Michaud, Annie Boned, Marc Dalod, Estelle Duprez, Paul Genever, Mark Coles, Marc Bajenoff, Luc Xerri, Michel Aurrand-Lions, Claudine Schiff, and Stéphane J.C. Mancini

Subjects
Biology (General), QH301-705.5
Abstract

Summary: In the bone marrow, CXCL12 and IL-7 are essential for B cell differentiation, whereas hematopoietic stem cell (HSC) maintenance requires SCF and CXCL12. Peri-sinusoidal stromal (PSS) cells are the main source of IL-7, but their characterization as a pro-B cell niche remains limited. Here, we characterize pro-B cell supporting stromal cells and decipher the interaction network allowing pro-B cell retention. Preferential contacts are found between pro-B cells and PSS cells, which homogeneously express HSC and B cell niche genes. Furthermore, pro-B cells are frequently located in the vicinity of HSCs in the same niche. Using an interactome bioinformatics pipeline, we identify Nidogen-1 as essential for pro-B cell retention in the peri-sinusoidal niche as confirmed in Nidogen-1−/− mice. Finally, human pro-B cells and hematopoietic progenitors are observed close to similar IL-7+ stromal cells. Thus, a multispecific niche exists in mouse and human supporting both early progenitors and committed hematopoietic lineages. : Balzano et al. show that bone marrow peri-sinusoidal stromal cells, which form the hematopoietic stem cell niche, also express B cell niche genes including IL-7 and Nidogen-1. Loss of Nidogen-1 expression specifically affects access of pro-B cells to IL-7, resulting in impaired expansion and differentiation of early B cells. Keywords: B cell development, hematopoietic stem cell, stromal cell niche, interaction network, bone marrow

Published
2019
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10. Critical role for adenosine receptor A2a in β-cell proliferation

Author

Nadja Schulz, Ka-Cheuk Liu, Jérémie Charbord, Charlotte L. Mattsson, Lingjie Tao, Dominika Tworus, and Olov Andersson

Subjects
Internal medicine, RC31-1245
Abstract

Objective: Pharmacological activation of adenosine signaling has been shown to increase β-cell proliferation and thereby β-cell regeneration in zebrafish and rodent models of diabetes. However, whether adenosine has an endogenous role in regulating β-cell proliferation is unknown. The objective of this study was to determine whether endogenous adenosine regulates β-cell proliferation—either in the basal state or states of increased demand for insulin—and to delineate the mechanisms involved. Methods: We analyzed the effect of pharmacological adenosine agonists on β-cell proliferation in in vitro cultures of mouse islets and in zebrafish models with β- or δ-cell ablation. In addition, we performed physiological and histological characterization of wild-type mice and mutant mice with pancreas- or β-cell-specific deficiency in Adora2a (the gene encoding adenosine receptor A2a). The mutant mice were used for in vivo studies on the role of adenosine in the basal state and during pregnancy (a state of increased demand for insulin), as well as for in vitro studies of cultured islets. Results: Pharmacological adenosine signaling in zebrafish had a stronger effect on β-cell proliferation during β-cell regeneration than in the basal state, an effect that was independent of the apoptotic microenvironment of the regeneration model. In mice, deficiency in Adora2a impaired glucose control and diminished compensatory β-cell proliferation during pregnancy but did not have any overt phenotype in the basal state. Islets isolated from Adora2a-deficient mice had a reduced baseline level of β-cell proliferation in vitro, consistent with our finding that UK432097, an A2a-specific agonist, promotes the proliferation of mouse β-cells in vitro. Conclusions: This is the first study linking endogenously produced adenosine to β-cell proliferation. Moreover, we show that adenosine signaling via the A2a receptor has an important role in compensatory β-cell proliferation, a feature that could be harnessed pharmacologically for β-cell expansion and future therapeutic development for diabetes. Keywords: β-cell proliferation, Adenosine, Islet biology, Gestational diabetes

Published
2016
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14. Hepatocytic Differentiation Potential of Human Fetal Liver Mesenchymal Stem Cells: In Vitro and In Vivo Evaluation

Author

Hoda El-Kehdy, Guillaume Pourcher, Wenwei Zhang, Zahia Hamidouche, Sylvie Goulinet-Mainot, Etienne Sokal, Pierre Charbord, Mustapha Najimi, and Anne Dubart-Kupperschmitt

Subjects
Internal medicine, RC31-1245
Abstract

In line with the search of effective stem cell population that would progress liver cell therapy and because the rate and differentiation potential of mesenchymal stem cells (MSC) decreases with age, the current study investigates the hepatogenic differentiation potential of human fetal liver MSCs (FL-MSCs). After isolation from 11-12 gestational weeks’ human fetal livers, FL-MSCs were shown to express characteristic markers such as CD73, CD90, and CD146 and to display adipocytic and osteoblastic differentiation potential. Thereafter, we explored their hepatocytic differentiation potential using the hepatogenic protocol applied for adult human liver mesenchymal cells. FL-MSCs differentiated in this way displayed significant features of hepatocyte-like cells as demonstrated in vitro by the upregulated expression of specific hepatocytic markers and the induction of metabolic functions including CYP3A4 activity, indocyanine green uptake/release, and glucose 6-phosphatase activity. Following transplantation, naive and differentiated FL-MSC were engrafted into the hepatic parenchyma of newborn immunodeficient mice and differentiated in situ. Hence, FL-MSCs appeared to be interesting candidates to investigate the liver development at the mesenchymal compartment level. Standardization of their isolation, expansion, and differentiation may also support their use for liver cell-based therapy development.

Published
2016
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19. Comparison of Gene Expression in Human Embryonic Stem Cells, hESC-Derived Mesenchymal Stem Cells and Human Mesenchymal Stem Cells

Author

Romain Barbet, Isabelle Peiffer, Antoinette Hatzfeld, Pierre Charbord, and Jacques A. Hatzfeld

Subjects
Internal medicine, RC31-1245
Abstract

We present a strategy to identify developmental/differentiation and plasma membrane marker genes of the most primitive human Mesenchymal Stem Cells (hMSCs). Using sensitive and quantitative TaqMan Low Density Arrays (TLDA) methodology, we compared the expression of 381 genes in human Embryonic Stem Cells (hESCs), hESC-derived MSCs (hES-MSCs), and hMSCs. Analysis of differentiation genes indicated that hES-MSCs express the sarcomeric muscle lineage in addition to the classical mesenchymal lineages, suggesting they are more primitive than hMSCs. Transcript analysis of membrane antigens suggests that IL1R1low, BMPR1Blow, FLT4low, LRRC32low, and CD34 may be good candidates for the detection and isolation of the most primitive hMSCs. The expression in hMSCs of cytokine genes, such as IL6, IL8, or FLT3LG, without expression of the corresponding receptor, suggests a role for these cytokines in the paracrine control of stem cell niches. Our database may be shared with other laboratories in order to explore the considerable clinical potential of hES-MSCs, which appear to represent an intermediate developmental stage between hESCs and hMSCs.

Published
2011
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22. Effects of Treatment of Malignant Lymphomas on the Granulocytic Progenitor Cells (CFUc)

Author

Parmentier, C., Maraninchi, D., Morardet, N., Droz, J. P., Charbord, P., Allfrey, V. G., editor, Allgöwer, M., editor, Bauer, K. H., editor, Berenblum, I., editor, Bergel, F., editor, Bernard, J., editor, Bernhard, W., editor, Blokhin, N. N., editor, Bock, H. E., editor, Braun, W., editor, Bucalossi, P., editor, Chaklin, A. V., editor, Chorazy, M., editor, Cunningham, G. J., editor, Porta, G. Della, editor, Denoix, P., editor, Dulbecco, R., editor, Eagle, H., editor, Eker, R., editor, Good, R. A., editor, Grabar, P., editor, Harris, R. J. C., editor, Hecker, E., editor, Herbeuval, R., editor, Higginson, J., editor, Hueper, W. C., editor, Isliker, H., editor, Kieler, J., editor, Kirsten, W. H., editor, Klein, G., editor, Koprowski, H., editor, Koss, L. G., editor, Martz, G., editor, Mathé, G., editor, Mühlbock, O., editor, Nakahara, W., editor, Old, L. J., editor, Potter, V. R., editor, Sabin, A. B., editor, Sachs, L., editor, Saxén, E. A., editor, Schmidt, C. G., editor, Spiegelman, S., editor, Szybalski, W., editor, Tagnon, H., editor, Taylor, R. M., editor, Tissières, A., editor, Uehlinger, E., editor, Wissler, R. W., editor, Rentchnick, P., editor, Mathé, Georges, editor, Seligmann, Maxime, editor, and Tubiana, Maurice, editor

Published
1978
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23. The european hematology association roadmap for european hematology research: A consensus document

Author

Engert, A. Balduini, C. Brand, A. Coiffier, B. Cordonnier, C. Döhner, H. De Wit, T.D. Eichinger, S. Fibbe, W. Green, T. De Haas, F. Iolascon, A. Jaffredo, T. Rodeghiero, F. Sall Es, G. Schuringa, J.J. André, M. Andre-Schmutz, I. Bacigalupo, A. Bochud, P.-Y. Den Boer, M. Bonini, C. Camaschella, C. Cant, A. Cappellini, M.D. Cazzola, M. Celso, C.L. Dimopoulos, M. Douay, L. Dzierzak, E. Einsele, H. Ferreri, A. De Franceschi, L. Gaulard, P. Gottgens, B. Greinacher, A. Gresele, P. Gribben, J. De Haan, G. Hansen, J.-B. Hochhaus, A. Kadir, R. Kaveri, S. Kouskoff, V. Kühne, T. Kyrle, P. Ljungman, P. Maschmeyer, G. Méndez-Ferrer, S. Milsom, M. Mummery, C. Ossenkoppele, G. Pecci, A. Peyvandi, F. Philipsen, S. Reitsma, P. Ribera, J.M. Risitano, A. Rivella, S. Ruf, W. Schroeder, T. Scully, M. Socie, G. Staal, F. Stanworth, S. Stauder, R. Stilgenbauer, S. Tamary, H. Theilgaard-Mönch, K. Thein, S.L. Tilly, H. Trneny, M. Vainchenker, W. Vannucchi, A.M. Viscoli, C. Vrielink, H. Zaaijer, H. Zanella, A. Zolla, L. Zwaginga, J.J. Martinez, P.A. Van Den Akker, E. Allard, S. Anagnou, N. Andolfo, I. Andrau, J.-C. Angelucci, E. Anstee, D. Aurer, I. Avet-Loiseau, H. Aydinok, Y. Bakchoul, T. Balduini, A. Barcellini, W. Baruch, D. Baruchel, A. Bayry, J. Bento, C. Van Den Berg, A. Bernardi, R. Bianchi, P. Bigas, A. Biondi, A. Bohonek, M. Bonnet, D. Borchmann, P. Borregaard, N. Brækkan, S. Van Den Brink, M. Brodin, E. Bullinger, L. Buske, C. Butzeck, B. Cammenga, J. Campo, E. Carbone, A. Cervantes, F. Cesaro, S. Charbord, P. Claas, F. Cohen, H. Conard, J. Coppo, P. Vives Corron, J.-L. Da Costa, L. Davi, F. Delwel, R. Dianzani, I. Domanović, D. Donnelly, P. Drnovšek, T.D. Dreyling, M. Du, M.-Q. Dufour, C. Durand, C. Efremov, D. Eleftheriou, A. Elion, J. Emonts, M. Engelhardt, M. Ezine, S. Falkenburg, F. Favier, R. Federico, M. Fenaux, P. Fitzgibbon, J. Flygare, J. Foà, R. Forrester, L. Galacteros, F. Garagiola, I. Gardiner, C. Garraud, O. Van Geet, C. Geiger, H. Geissler, J. Germing, U. Ghevaert, C. Girelli, D. Godeau, B. Gökbuget, N. Goldschmidt, H. Goodeve, A. Graf, T. Graziadei, G. Griesshammer, M. Gruel, Y. Guilhot, F. Von Gunten, S. Gyssens, I. Halter, J. Harrison, C. Harteveld, C. Hellström-Lindberg, E. Hermine, O. Higgs, D. Hillmen, P. Hirsch, H. Hoskin, P. Huls, G. Inati, A. Johnson, P. Kattamis, A. Kiefel, V. Kleanthous, M. Klump, H. Krause, D. Hovinga, J.K. Lacaud, G. Lacroix-Desmazes, S. Landman-Parker, J. Legouill, S. Lenz, G. Von Lilienfeld-Toal, M. Von Lindern, M. Lopez-Guillermo, A. Lopriore, E. Lozano, M. Macintyre, E. Makris, M. Mannhalter, C. Martens, J. Mathas, S. Matzdorff, A. Medvinsky, A. Menendez, P. Migliaccio, A.R. Miharada, K. Mikulska, M. Minard, V. Montalbán, C. De Montalembert, M. Montserrat, E. Morange, P.-E. Mountford, J. Muckenthaler, M. Müller-Tidow, C. Mumford, A. Nadel, B. Navarro, J.-T. El Nemer, W. Noizat-Pirenne, F. O’Mahony, B. Oldenburg, J. Olsson, M. Oostendorp, R. Palumbo, A. Passamonti, F. Patient, R. De Latour, R.P. Pflumio, F. Pierelli, L. Piga, A. Pollard, D. Raaijmakers, M. Radford, J. Rambach, R. Koneti Rao, A. Raslova, H. Rebulla, P. Rees, D. Ribrag, V. Rijneveld, A. Rinalducci, S. Robak, T. Roberts, I. Rodrigues, C. Rosendaal, F. Rosenwald, A. Rule, S. Russo, R. Saglio, G. Sanchez, M. Scharf, R.E. Schlenke, P. Semple, J. Sierra, J. So-Osman, C. Soria, J.M. Stamatopoulos, K. Stegmayr, B. Stunnenberg, H. Swinkels, D. Barata, J.P.T. Taghon, T. Taher, A. Terpos, E. Thachil, J. Tissot, J.D. Touw, I. Toye, A. Trappe, R. Traverse-Glehen, A. Unal, S. Vaulont, S. Viprakasit, V. Vitolo, U. Van Wijk, R. Wójtowicz, A. Zeerleder, S. Zieger, B. EHA Roadmap for European Hematology Research

Abstract

The European Hematology Association (EHA) Roadmap for European Hematology Research highlights major achievements in diagnosis and treatment of blood disorders and identifies the greatest unmet clinical and scientific needs in those areas to enable better funded, more focused European hematology research. Initiated by the EHA, around 300 experts contributed to the consensus document, which will help European policy makers, research funders, research organizations, researchers, and patient groups make better informed decisions on hematology research. It also aims to raise public awareness of the burden of blood disorders on European society, which purely in economic terms is estimated at ∈ European Hematology Association (EHA) Roadmap for European Hematology Research highlights major achievements in diagnosis and treatment of blood disorders and identifies the greatest unmet clinical and scientific needs in those areas to enable better fu treatments, sometimes in revolutionary ways. This progress highlights the potential of focused basic research programs such as this EHA Roadmap. The EHA Roadmap identifies nine ‘sections’ in hematology: normal hematopoiesis, malignant lymphoid and myeloid diseases, anemias and related diseases, platelet disorders, blood coagulation and hemostatic disorders, transfusion medicine, infections in hematology, and hematopoietic stem cell transplantation. These sections span 60 smaller groups of diseases or disorders. The EHA Roadmap identifies priorities and needs across the field of hematology, including those to develop targeted therapies based on genomic profiling and chemical biology, to eradicate minimal residual malignant disease, and to develop cellular immunotherapies, combination treatments, gene therapies, hematopoietic stem cell treatments, and treatments that are better tolerated by elderly patients. © 2016 Ferrata Storti Foundation.

Published
2016

25. The European Hematology Association Roadmap for European Hematology Research: a consensus document.

Author

EHA Roadmap for European Hematology, Research, Engert, A., Balduini, C., Brand, A., Coiffier, B., Cordonnier, C., Döhner, H., de Wit TD., Eichinger, S., Fibbe, W., Green, T., de Haas, F., Iolascon, A., Jaffredo, T., Rodeghiero, F., Salles, G., Schuringa, JJ., André, M., Andre-Schmutz, I., Bacigalupo, A., Bochud, PY., Boer, Md., Bonini, C., Camaschella, C., Cant, A., Cappellini, MD., Cazzola, M., Celso, CL., Dimopoulos, M., Douay, L., Dzierzak, E., Einsele, H., Ferreri, A., De Franceschi, L., Gaulard, P., Gottgens, B., Greinacher, A., Gresele, P., Gribben, J., de Haan, G., Hansen, JB., Hochhaus, A., Kadir, R., Kaveri, S., Kouskoff, V., Kühne, T., Kyrle, P., Ljungman, P., Maschmeyer, G., Méndez-Ferrer£££Simón£££ S., Milsom, M., Mummery, C., Ossenkoppele, G., Pecci, A., Peyvandi, F., Philipsen, S., Reitsma, P., Ribera, JM., Risitano, A., Rivella, S., Ruf, W., Schroeder, T., Scully, M., Socie, G., Staal, F., Stanworth, S., Stauder, R., Stilgenbauer, S., Tamary, H., Theilgaard-Mönch, K., Thein, SL., Tilly, H., Trneny, M., Vainchenker, W., Vannucchi, AM., Viscoli, C., Vrielink, H., Zaaijer, H., Zanella, A., Zolla, L., Zwaginga, JJ., Martinez, PA., van den Akker, E., Allard, S., Anagnou, N., Andolfo, I., Andrau, JC., Angelucci, E., Anstee, D., Aurer, I., Avet-Loiseau, H., Aydinok, Y., Bakchoul, T., Balduini, A., Barcellini, W., Baruch, D., Baruchel, A., Bayry, J., Bento, C., van den Berg, A., Bernardi, R., Bianchi, P., Bigas, A., Biondi, A., Bohonek, M., Bonnet, D., Borchmann, P., Borregaard, N., Brækkan, S., van den Brink, M., Brodin, E., Bullinger, L., Buske, C., Butzeck, B., Cammenga, J., Campo, E., Carbone, A., Cervantes, F., Cesaro, S., Charbord, P., Claas, F., Cohen, H., Conard, J., Coppo, P., Corrons, JL., Costa, Ld., Davi, F., Delwel, R., Dianzani, I., Domanović, D., Donnelly, P., Drnov?ek£££Tadeja Dovč£££ TD., Dreyling, M., Du, MQ., Dufour, C., Durand, C., Efremov, D., Eleftheriou, A., Elion, J., Emonts, M., Engelhardt, M., Ezine, S., Falkenburg, F., Favier, R., Federico, M., Fenaux, P., Fitzgibbon, J., Flygare, J., Foà, R., Forrester, L., Galacteros, F., Garagiola, I., Gardiner, C., Garraud, O., van Geet, C., Geiger, H., Geissler, J., Germing, U., Ghevaert, C., Girelli, D., Godeau, B., Gökbuget, N., Goldschmidt, H., Goodeve, A., Graf, T., Graziadei, G., Griesshammer, M., Gruel, Y., Guilhot, F., von Gunten, S., Gyssens, I., Halter, J., Harrison, C., Harteveld, C., Hellström-Lindberg, E., Hermine, O., Higgs, D., Hillmen, P., Hirsch, H., Hoskin, P., Huls, G., Inati, A., Johnson, P., Kattamis, A., Kiefel, V., Kleanthous, M., Klump, H., Krause, D., Hovinga, JK., Lacaud, G., Lacroix-Desmazes, S., Landman-Parker, J., LeGouill, S., Lenz, G., von Lilienfeld-Toal, M., von Lindern, M., Lopez-Guillermo, A., Lopriore, E., Lozano, M., MacIntyre, E., Makris, M., Mannhalter, C., Martens, J., Mathas, S., Matzdorff, A., Medvinsky, A., Menendez, P., Migliaccio, AR., Miharada, K., Mikulska, M., Minard, V., Montalbán, C., de Montalembert, M., Montserrat, E., Morange, PE., Mountford, J., Muckenthaler, M., Müller-Tidow, C., Mumford, A., Nadel, B., Navarro, JT., Nemer, We., Noizat-Pirenne, F., O'Mahony, B., Oldenburg, J., Olsson, M., Oostendorp, R., Palumbo, A., Passamonti, F., Patient, R., Peffault, R., Pflumio, F., Pierelli, L., Piga, A., Pollard, D., Raaijmakers, M., Radford, J., Rambach, R., Rao, AK., Raslova, H., Rebulla, P., Rees, D., Ribrag, V., Rijneveld, A., Rinalducci, S., Robak, T., Roberts, I., Rodrigues, C., Rosendaal, F., Rosenwald, A., Rule, S., Russo, R., Saglio, G., Sanchez, M., Scharf, RE., Schlenke, P., Semple, J., Sierra, J., So-Osman, C., Soria, JM., Stamatopoulos, K., Stegmayr, B., Stunnenberg, H., Swinkels, D., Barata£££João Pedro Taborda£££ JP., Taghon, T., Taher, A., Terpos, E., Thachil, J., Tissot, JD., Touw, I., Toye, A., Trappe, R., Traverse-Glehen, A., Unal, S., Vaulont, S., Viprakasit, V., Vitolo, U., van Wijk, R., Wójtowicz, A., Zeerleder, S., Zieger, B., de Wit, T.D., Schuringa, J.J., EHA Roadmap for European Hematology, Research, Engert, A., Balduini, C., Brand, A., Coiffier, B., Cordonnier, C., Döhner, H., de Wit TD., Eichinger, S., Fibbe, W., Green, T., de Haas, F., Iolascon, A., Jaffredo, T., Rodeghiero, F., Salles, G., Schuringa, JJ., André, M., Andre-Schmutz, I., Bacigalupo, A., Bochud, PY., Boer, Md., Bonini, C., Camaschella, C., Cant, A., Cappellini, MD., Cazzola, M., Celso, CL., Dimopoulos, M., Douay, L., Dzierzak, E., Einsele, H., Ferreri, A., De Franceschi, L., Gaulard, P., Gottgens, B., Greinacher, A., Gresele, P., Gribben, J., de Haan, G., Hansen, JB., Hochhaus, A., Kadir, R., Kaveri, S., Kouskoff, V., Kühne, T., Kyrle, P., Ljungman, P., Maschmeyer, G., Méndez-Ferrer£££Simón£££ S., Milsom, M., Mummery, C., Ossenkoppele, G., Pecci, A., Peyvandi, F., Philipsen, S., Reitsma, P., Ribera, JM., Risitano, A., Rivella, S., Ruf, W., Schroeder, T., Scully, M., Socie, G., Staal, F., Stanworth, S., Stauder, R., Stilgenbauer, S., Tamary, H., Theilgaard-Mönch, K., Thein, SL., Tilly, H., Trneny, M., Vainchenker, W., Vannucchi, AM., Viscoli, C., Vrielink, H., Zaaijer, H., Zanella, A., Zolla, L., Zwaginga, JJ., Martinez, PA., van den Akker, E., Allard, S., Anagnou, N., Andolfo, I., Andrau, JC., Angelucci, E., Anstee, D., Aurer, I., Avet-Loiseau, H., Aydinok, Y., Bakchoul, T., Balduini, A., Barcellini, W., Baruch, D., Baruchel, A., Bayry, J., Bento, C., van den Berg, A., Bernardi, R., Bianchi, P., Bigas, A., Biondi, A., Bohonek, M., Bonnet, D., Borchmann, P., Borregaard, N., Brækkan, S., van den Brink, M., Brodin, E., Bullinger, L., Buske, C., Butzeck, B., Cammenga, J., Campo, E., Carbone, A., Cervantes, F., Cesaro, S., Charbord, P., Claas, F., Cohen, H., Conard, J., Coppo, P., Corrons, JL., Costa, Ld., Davi, F., Delwel, R., Dianzani, I., Domanović, D., Donnelly, P., Drnov?ek£££Tadeja Dovč£££ TD., Dreyling, M., Du, MQ., Dufour, C., Durand, C., Efremov, D., Eleftheriou, A., Elion, J., Emonts, M., Engelhardt, M., Ezine, S., Falkenburg, F., Favier, R., Federico, M., Fenaux, P., Fitzgibbon, J., Flygare, J., Foà, R., Forrester, L., Galacteros, F., Garagiola, I., Gardiner, C., Garraud, O., van Geet, C., Geiger, H., Geissler, J., Germing, U., Ghevaert, C., Girelli, D., Godeau, B., Gökbuget, N., Goldschmidt, H., Goodeve, A., Graf, T., Graziadei, G., Griesshammer, M., Gruel, Y., Guilhot, F., von Gunten, S., Gyssens, I., Halter, J., Harrison, C., Harteveld, C., Hellström-Lindberg, E., Hermine, O., Higgs, D., Hillmen, P., Hirsch, H., Hoskin, P., Huls, G., Inati, A., Johnson, P., Kattamis, A., Kiefel, V., Kleanthous, M., Klump, H., Krause, D., Hovinga, JK., Lacaud, G., Lacroix-Desmazes, S., Landman-Parker, J., LeGouill, S., Lenz, G., von Lilienfeld-Toal, M., von Lindern, M., Lopez-Guillermo, A., Lopriore, E., Lozano, M., MacIntyre, E., Makris, M., Mannhalter, C., Martens, J., Mathas, S., Matzdorff, A., Medvinsky, A., Menendez, P., Migliaccio, AR., Miharada, K., Mikulska, M., Minard, V., Montalbán, C., de Montalembert, M., Montserrat, E., Morange, PE., Mountford, J., Muckenthaler, M., Müller-Tidow, C., Mumford, A., Nadel, B., Navarro, JT., Nemer, We., Noizat-Pirenne, F., O'Mahony, B., Oldenburg, J., Olsson, M., Oostendorp, R., Palumbo, A., Passamonti, F., Patient, R., Peffault, R., Pflumio, F., Pierelli, L., Piga, A., Pollard, D., Raaijmakers, M., Radford, J., Rambach, R., Rao, AK., Raslova, H., Rebulla, P., Rees, D., Ribrag, V., Rijneveld, A., Rinalducci, S., Robak, T., Roberts, I., Rodrigues, C., Rosendaal, F., Rosenwald, A., Rule, S., Russo, R., Saglio, G., Sanchez, M., Scharf, RE., Schlenke, P., Semple, J., Sierra, J., So-Osman, C., Soria, JM., Stamatopoulos, K., Stegmayr, B., Stunnenberg, H., Swinkels, D., Barata£££João Pedro Taborda£££ JP., Taghon, T., Taher, A., Terpos, E., Thachil, J., Tissot, JD., Touw, I., Toye, A., Trappe, R., Traverse-Glehen, A., Unal, S., Vaulont, S., Viprakasit, V., Vitolo, U., van Wijk, R., Wójtowicz, A., Zeerleder, S., Zieger, B., de Wit, T.D., and Schuringa, J.J.

Abstract

The European Hematology Association (EHA) Roadmap for European Hematology Research highlights major achievements in diagnosis and treatment of blood disorders and identifies the greatest unmet clinical and scientific needs in those areas to enable better funded, more focused European hematology research. Initiated by the EHA, around 300 experts contributed to the consensus document, which will help European policy makers, research funders, research organizations, researchers, and patient groups make better informed decisions on hematology research. It also aims to raise public awareness of the burden of blood disorders on European society, which purely in economic terms is estimated at euro23 billion per year, a level of cost that is not matched in current European hematology research funding. In recent decades, hematology research has improved our fundamental understanding of the biology of blood disorders, and has improved diagnostics and treatments, sometimes in revolutionary ways. This progress highlights the potential of focused basic research programs such as this EHA Roadmap.The EHA Roadmap identifies nine 'sections' in hematology: normal hematopoiesis, malignant lymphoid and myeloid diseases, anemias and related diseases, platelet disorders, blood coagulation and hemostatic disorders, transfusion medicine, infections in hematology, and hematopoietic stem cell transplantation. These sections span 60 smaller groups of diseases or disorders.The EHA Roadmap identifies priorities and needs across the field of hematology, including those to develop targeted therapies based on genomic profiling and chemical biology, to eradicate minimal residual malignant disease, and to develop cellular immunotherapies, combination treatments, gene therapies, hematopoietic stem cell treatments, and treatments that are better tolerated by elderly patients.

Published
2016

26. The european hematology association roadmap for european hematology research: A consensus document

Author

Engert, A, Balduini, C, Brand, A, Coiffier, B, Cordonnier, C, Döhner, H, De Wit, T, Eichinger, S, Fibbe, W, Green, T, De Haas, F, Iolascon, A, Jaffredo, T, Rodeghiero, F, Sall Es, G, Schuringa, J, André, M, Andre Schmutz, I, Bacigalupo, A, Bochud, P, Den Boer, M, Bonini, C, Camaschella, C, Cant, A, Cappellini, M, Cazzola, M, Celso, C, Dimopoulos, M, Douay, L, Dzierzak, E, Einsele, H, Ferreri, A, De Franceschi, L, Gaulard, P, Gottgens, B, Greinacher, A, Gresele, P, Gribben, J, De Haan, G, Hansen, J, Hochhaus, A, Kadir, R, Kaveri, S, Kouskoff, V, Kühne, T, Kyrle, P, Ljungman, P, Maschmeyer, G, Méndez Ferrer, S, Milsom, M, Mummery, C, Ossenkoppele, G, Pecci, A, Peyvandi, F, Philipsen, S, Reitsma, P, Ribera, J, Risitano, A, Rivella, S, Ruf, W, Schroeder, T, Scully, M, Socie, G, Staal, F, Stanworth, S, Stauder, R, Stilgenbauer, S, Tamary, H, Theilgaard Mönch, K, Thein, S, Tilly, H, Trneny, M, Vainchenker, W, Vannucchi, A, Viscoli, C, Vrielink, H, Zaaijer, H, Zanella, A, Zolla, L, Zwaginga, J, Martinez, P, Van Den Akker, E, Allard, S, Anagnou, N, Andolfo, I, Andrau, J, Angelucci, E, Anstee, D, Aurer, I, Avet Loiseau, H, Aydinok, Y, Bakchoul, T, Balduini, A, Barcellini, W, Baruch, D, Baruchel, A, Bayry, J, Bento, C, Van Den Berg, A, Bernardi, R, Bianchi, P, Bigas, A, Biondi, A, Bohonek, M, Bonnet, D, Borchmann, P, Borregaard, N, Brækkan, S, Van Den Brink, M, Brodin, E, Bullinger, L, Buske, C, Butzeck, B, Cammenga, J, Campo, E, Carbone, A, Cervantes, F, Cesaro, S, Charbord, P, Claas, F, Cohen, H, Conard, J, Coppo, P, Vives Corron, J, Da Costa, L, Davi, F, Delwel, R, Dianzani, I, Domanović, D, Donnelly, P, Drnovšek, T, Dreyling, M, Du, M, Dufour, C, Durand, C, Efremov, D, Eleftheriou, A, Elion, J, Emonts, M, Engelhardt, M, Ezine, S, Falkenburg, F, Favier, R, Federico, M, Fenaux, P, Fitzgibbon, J, Flygare, J, Foà, R, Forrester, L, Galacteros, F, Garagiola, I, Gardiner, C, Garraud, O, Van Geet, C, Geiger, H, Geissler, J, Germing, U, Ghevaert, C, Girelli, D, Godeau, B, Gökbuget, N, Goldschmidt, H, Goodeve, A, Graf, T, Graziadei, G, Griesshammer, M, Gruel, Y, Guilhot, F, Von Gunten, S, Gyssens, I, Halter, J, Harrison, C, Harteveld, C, Hellström Lindberg, E, Hermine, O, Higgs, D, Hillmen, P, Hirsch, H, Hoskin, P, Huls, G, Inati, A, Johnson, P, Kattamis, A, Kiefel, V, Kleanthous, M, Klump, H, Krause, D, Hovinga, J, Lacaud, G, Lacroix Desmazes, S, Landman Parker, J, Legouill, S, Lenz, G, Von Lilienfeld Toal, M, Von Lindern, M, Lopez Guillermo, A, Lopriore, E, Lozano, M, Macintyre, E, Makris, M, Mannhalter, C, Martens, J, Mathas, S, Matzdorff, A, Medvinsky, A, Menendez, P, Migliaccio, A, Miharada, K, Mikulska, M, Minard, V, Montalbán, C, De Montalembert, M, Montserrat, E, Morange, P, Mountford, J, Muckenthaler, M, Müller Tidow, C, Mumford, A, Nadel, B, Navarro, J, El Nemer, W, Noizat Pirenne, F, O’Mahony, B, Oldenburg, J, Olsson, M, Oostendorp, R, Palumbo, A, Passamonti, F, Patient, R, De Latour, R, Pflumio, F, Pierelli, L, Piga, A, Pollard, D, Raaijmakers, M, Radford, J, Rambach, R, Koneti Rao, A, Raslova, H, Rebulla, P, Rees, D, Ribrag, V, Rijneveld, A, Rinalducci, S, Robak, T, Roberts, I, Rodrigues, C, Rosendaal, F, Rosenwald, A, Rule, S, Russo, R, Saglio, G, Sanchez, M, Scharf, R, Schlenke, P, Semple, J, Sierra, J, So Osman, C, Soria, J, Stamatopoulos, K, Stegmayr, B, Stunnenberg, H, Swinkels, D, Barata, J, Taghon, T, Taher, A, Terpos, E, Thachil, J, Tissot, J, Touw, I, Toye, A, Trappe, R, Traverse Glehen, A, Unal, S, Vaulont, S, Viprakasit, V, Vitolo, U, Van Wijk, R, Wójtowicz, A, Zeerleder, S, Zieger, B, Zieger, B., ZANELLA, ALBERTO, BIONDI, ANDREA, Engert, A, Balduini, C, Brand, A, Coiffier, B, Cordonnier, C, Döhner, H, De Wit, T, Eichinger, S, Fibbe, W, Green, T, De Haas, F, Iolascon, A, Jaffredo, T, Rodeghiero, F, Sall Es, G, Schuringa, J, André, M, Andre Schmutz, I, Bacigalupo, A, Bochud, P, Den Boer, M, Bonini, C, Camaschella, C, Cant, A, Cappellini, M, Cazzola, M, Celso, C, Dimopoulos, M, Douay, L, Dzierzak, E, Einsele, H, Ferreri, A, De Franceschi, L, Gaulard, P, Gottgens, B, Greinacher, A, Gresele, P, Gribben, J, De Haan, G, Hansen, J, Hochhaus, A, Kadir, R, Kaveri, S, Kouskoff, V, Kühne, T, Kyrle, P, Ljungman, P, Maschmeyer, G, Méndez Ferrer, S, Milsom, M, Mummery, C, Ossenkoppele, G, Pecci, A, Peyvandi, F, Philipsen, S, Reitsma, P, Ribera, J, Risitano, A, Rivella, S, Ruf, W, Schroeder, T, Scully, M, Socie, G, Staal, F, Stanworth, S, Stauder, R, Stilgenbauer, S, Tamary, H, Theilgaard Mönch, K, Thein, S, Tilly, H, Trneny, M, Vainchenker, W, Vannucchi, A, Viscoli, C, Vrielink, H, Zaaijer, H, Zanella, A, Zolla, L, Zwaginga, J, Martinez, P, Van Den Akker, E, Allard, S, Anagnou, N, Andolfo, I, Andrau, J, Angelucci, E, Anstee, D, Aurer, I, Avet Loiseau, H, Aydinok, Y, Bakchoul, T, Balduini, A, Barcellini, W, Baruch, D, Baruchel, A, Bayry, J, Bento, C, Van Den Berg, A, Bernardi, R, Bianchi, P, Bigas, A, Biondi, A, Bohonek, M, Bonnet, D, Borchmann, P, Borregaard, N, Brækkan, S, Van Den Brink, M, Brodin, E, Bullinger, L, Buske, C, Butzeck, B, Cammenga, J, Campo, E, Carbone, A, Cervantes, F, Cesaro, S, Charbord, P, Claas, F, Cohen, H, Conard, J, Coppo, P, Vives Corron, J, Da Costa, L, Davi, F, Delwel, R, Dianzani, I, Domanović, D, Donnelly, P, Drnovšek, T, Dreyling, M, Du, M, Dufour, C, Durand, C, Efremov, D, Eleftheriou, A, Elion, J, Emonts, M, Engelhardt, M, Ezine, S, Falkenburg, F, Favier, R, Federico, M, Fenaux, P, Fitzgibbon, J, Flygare, J, Foà, R, Forrester, L, Galacteros, F, Garagiola, I, Gardiner, C, Garraud, O, Van Geet, C, Geiger, H, Geissler, J, Germing, U, Ghevaert, C, Girelli, D, Godeau, B, Gökbuget, N, Goldschmidt, H, Goodeve, A, Graf, T, Graziadei, G, Griesshammer, M, Gruel, Y, Guilhot, F, Von Gunten, S, Gyssens, I, Halter, J, Harrison, C, Harteveld, C, Hellström Lindberg, E, Hermine, O, Higgs, D, Hillmen, P, Hirsch, H, Hoskin, P, Huls, G, Inati, A, Johnson, P, Kattamis, A, Kiefel, V, Kleanthous, M, Klump, H, Krause, D, Hovinga, J, Lacaud, G, Lacroix Desmazes, S, Landman Parker, J, Legouill, S, Lenz, G, Von Lilienfeld Toal, M, Von Lindern, M, Lopez Guillermo, A, Lopriore, E, Lozano, M, Macintyre, E, Makris, M, Mannhalter, C, Martens, J, Mathas, S, Matzdorff, A, Medvinsky, A, Menendez, P, Migliaccio, A, Miharada, K, Mikulska, M, Minard, V, Montalbán, C, De Montalembert, M, Montserrat, E, Morange, P, Mountford, J, Muckenthaler, M, Müller Tidow, C, Mumford, A, Nadel, B, Navarro, J, El Nemer, W, Noizat Pirenne, F, O’Mahony, B, Oldenburg, J, Olsson, M, Oostendorp, R, Palumbo, A, Passamonti, F, Patient, R, De Latour, R, Pflumio, F, Pierelli, L, Piga, A, Pollard, D, Raaijmakers, M, Radford, J, Rambach, R, Koneti Rao, A, Raslova, H, Rebulla, P, Rees, D, Ribrag, V, Rijneveld, A, Rinalducci, S, Robak, T, Roberts, I, Rodrigues, C, Rosendaal, F, Rosenwald, A, Rule, S, Russo, R, Saglio, G, Sanchez, M, Scharf, R, Schlenke, P, Semple, J, Sierra, J, So Osman, C, Soria, J, Stamatopoulos, K, Stegmayr, B, Stunnenberg, H, Swinkels, D, Barata, J, Taghon, T, Taher, A, Terpos, E, Thachil, J, Tissot, J, Touw, I, Toye, A, Trappe, R, Traverse Glehen, A, Unal, S, Vaulont, S, Viprakasit, V, Vitolo, U, Van Wijk, R, Wójtowicz, A, Zeerleder, S, Zieger, B, Zieger, B., ZANELLA, ALBERTO, and BIONDI, ANDREA

Abstract

The European Hematology Association (EHA) Roadmap for European Hematology Research highlights major achievements in diagnosis and treatment of blood disorders and identifies the greatest unmet clinical and scientific needs in those areas to enable better funded, more focused European hematology research. Initiated by the EHA, around 300 experts contributed to the consensus document, which will help European policy makers, research funders, research organizations, researchers, and patient groups make better informed decisions on hematology research. It also aims to raise public awareness of the burden of blood disorders on European society, which purely in economic terms is estimated at ∈ European Hematology Association (EHA) Roadmap for European Hematology Research highlights major achievements in diagnosis and treatment of blood disorders and identifies the greatest unmet clinical and scientific needs in those areas to enable better fu treatments, sometimes in revolutionary ways. This progress highlights the potential of focused basic research programs such as this EHA Roadmap. The EHA Roadmap identifies nine ‘sections’ in hematology: normal hematopoiesis, malignant lymphoid and myeloid diseases, anemias and related diseases, platelet disorders, blood coagulation and hemostatic disorders, transfusion medicine, infections in hematology, and hematopoietic stem cell transplantation. These sections span 60 smaller groups of diseases or disorders. The EHA Roadmap identifies priorities and needs across the field of hematology, including those to develop targeted therapies based on genomic profiling and chemical biology, to eradicate minimal residual malignant disease, and to develop cellular immunotherapies, combination treatments, gene therapies, hematopoietic stem cell treatments, and treatments that are better tolerated by elderly patients.

Published
2016

33. Critical role for adenosine receptor A2a in β-cell proliferation.

Author

Schulz, Nadja, Liu, Ka-Cheuk, Charbord, Jérémie, Mattsson, Charlotte L., Tao, Lingjie, Tworus, Dominika, and Andersson, Olov

Abstract

Objective Pharmacological activation of adenosine signaling has been shown to increase β-cell proliferation and thereby β-cell regeneration in zebrafish and rodent models of diabetes. However, whether adenosine has an endogenous role in regulating β-cell proliferation is unknown. The objective of this study was to determine whether endogenous adenosine regulates β-cell proliferation—either in the basal state or states of increased demand for insulin—and to delineate the mechanisms involved. Methods We analyzed the effect of pharmacological adenosine agonists on β-cell proliferation in in vitro cultures of mouse islets and in zebrafish models with β- or δ-cell ablation. In addition, we performed physiological and histological characterization of wild-type mice and mutant mice with pancreas- or β-cell-specific deficiency in Adora2a (the gene encoding adenosine receptor A2a). The mutant mice were used for in vivo studies on the role of adenosine in the basal state and during pregnancy (a state of increased demand for insulin), as well as for in vitro studies of cultured islets. Results Pharmacological adenosine signaling in zebrafish had a stronger effect on β-cell proliferation during β-cell regeneration than in the basal state, an effect that was independent of the apoptotic microenvironment of the regeneration model. In mice, deficiency in Adora2a impaired glucose control and diminished compensatory β-cell proliferation during pregnancy but did not have any overt phenotype in the basal state. Islets isolated from Adora2a -deficient mice had a reduced baseline level of β-cell proliferation in vitro , consistent with our finding that UK432097, an A2a-specific agonist, promotes the proliferation of mouse β-cells in vitro . Conclusions This is the first study linking endogenously produced adenosine to β-cell proliferation. Moreover, we show that adenosine signaling via the A2a receptor has an important role in compensatory β-cell proliferation, a feature that could be harnessed pharmacologically for β-cell expansion and future therapeutic development for diabetes. [ABSTRACT FROM AUTHOR]

Published
2016
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34. Bistable Epigenetic States Explain Age‐Dependent Decline in Mesenchymal Stem Cell Heterogeneity

Author

Hamidouche, Zahia, Rother, Karen, Przybilla, Jens, Krinner, Axel, Clay, Denis, Hopp, Lydia, Fabian, Claire, Stolzing, Alexandra, Binder, Hans, Charbord, Pierre, and Galle, Joerg

Abstract

The molecular mechanisms by which heterogeneity, a major characteristic of stem cells, is achieved are yet unclear. We here study the expression of the membrane stem cell antigen‐1 (Sca‐1) in mouse bone marrow mesenchymal stem cell (MSC) clones. We show that subpopulations with varying Sca‐1 expression profiles regenerate the Sca‐1 profile of the mother population within a few days. However, after extensive replication in vitro, the expression profiles shift to lower values and the regeneration time increases. Study of the promoter of Ly6a unravels that the expression level of Sca‐1 is related to the promoter occupancy by the activating histone mark H3K4me3. We demonstrate that these findings can be consistently explained by a computational model that considers positive feedback between promoter H3K4me3 modification and gene transcription. This feedback implicates bistable epigenetic states which the cells occupy with an age‐dependent frequency due to persistent histone (de‐)modification. Our results provide evidence that MSC heterogeneity, and presumably that of other stem cells, is associated with bistable epigenetic states and suggest that MSCs are subject to permanent state fluctuations. StemCells2017;35:694–704 In young cells, expression of Sca‐1 is bistable. Frequent switches between high (Sca‐1H, red) and low (Sca‐1L, blue) expression states occur due to stochastic H3K4me3 (de‐) modification reactions at the gene promoter leading to gene expression heterogeneity. Accordingly, Sca‐1H and Sca‐1L populations regenerate the expression profile of their mother population (WCP) within a few days.During aging, gene activation by the underlying transcription factor network is reduced, stabilizing Sca‐1L states. Eventually, the system becomes monostable.

Published
2017
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36. Culture and Characterization of Human Bone Marrow Mesenchymal Stem Cells.

Author

Walker, John M., Hauser, Hansjörg, Fussenegger, Martin, Delorme, Bruno, and Charbord, Pierre

Abstract

Bone marrow (BM) mesenchymal stem cells (MSCs) are non-hematopoietic cells capable of generating colonies of plastic-adherent marrow mesenchymal cells, each derived from a single cell termed a colony-forming unit fibroblasts (CFU-Fs). In addition to their role in establishing the marrow microenvironment, these cells have been shown to differentiate into several types of mesenchymal and non-mesenchymal lineages. Because of their multipotency, MSCs represent an attractive cellular source in the promising field of cellular therapy. In this chapter, we will focus on culture conditions for human BM MSC expansion and CFU-F assays. We also describe the methodologies to analyze the primary cultures obtained, both at the phenotypic and at the functional levels. Phenotypically, MSCs can be defined with a minimal set of markers as CD31-, CD34-, and CD45-negative cells and CD13-, CD29-, CD73-, CD90-, CD105-, and CD166-positive cells. Functionally, we describe the culture conditions (specific media and cellular preparations) for in vitro differentiation of MSCs into the adipogenic, osteogenic, and chondrogenic lineages. The corresponding colorimetric assays (oil red O, Von Kossa and alizarin red S, and safranin O and alcian blue stains, respectively) are also described. [ABSTRACT FROM AUTHOR]

Published
2007
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49. A Systems Biology Approach for Defining the Molecular Framework of the Hematopoietic Stem Cell Niche

Author

Charbord, Pierre, Pouget, Claire, Binder, Hans, Dumont, Florent, Stik, Grégoire, Levy, Pacifique, Allain, Fabrice, Marchal, Céline, Richter, Jenna, Uzan, Benjamin, Pflumio, Françoise, Letourneur, Franck, Wirth, Henry, Dzierzak, Elaine, Traver, David, Jaffredo, Thierry, and Durand, Charles

Abstract

Despite progress in identifying the cellular composition of hematopoietic stem/progenitor cell (HSPC) niches, little is known about the molecular requirements of HSPC support. To address this issue, we used a panel of six recognized HSPC-supportive stromal lines and less-supportive counterparts originating from embryonic and adult hematopoietic sites. Through comprehensive transcriptomic meta-analyses, we identified 481 mRNAs and 17 microRNAs organized in a modular network implicated in paracrine signaling. Further inclusion of 18 additional cell strains demonstrated that this mRNA subset was predictive of HSPC support. Our gene set contains most known HSPC regulators as well as a number of unexpected ones, such as Pax9 and Ccdc80, as validated by functional studies in zebrafish embryos. In sum, our approach has identified the core molecular network required for HSPC support. These cues, along with a searchable web resource, will inform ongoing efforts to instruct HSPC ex vivo amplification and formation from pluripotent precursors.

Published
2014
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50. High throughput screening for inhibitors of REST in neural derivatives of human embryonic stem cells reveals a chemical compound that promotes expression of neuronal genes

Author

Charbord, Jérémie, Poydenot, Pauline, Bonnefond, Caroline, Feyeux, Maxime, Casagrande, Fabrice, Brinon, Benjamin, Francelle, Laetitia, Aurégan, Gwenaelle, Guillermier, Martine, Cailleret, Michel, Viegas, Pedro, Nicoleau, Camille, Martinat, Cécile, Brouillet, Emmanuel, Cattaneo, Elena, Peschanski, Marc, Lechuga, Marc, and Perrier, Anselme L.

Abstract

Decreased expression of neuronal genes such as brain‐derived neurotrophic factor (BDNF) is associated with several neurological disorders. One molecular mechanism associated with Huntington disease (HD) is a discrete increase in the nuclear activity of the transcriptional repressor REST/NRSF binding to repressor element‐1 (RE1) sequences. High‐throughput screening of a library of 6,984 compounds with luciferase‐assay measuring REST activity in neural derivatives of human embryonic stem cells led to identify two benzoimidazole‐5‐carboxamide derivatives that inhibited REST silencing in a RE1‐dependent manner. The most potent compound, X5050, targeted REST degradation, but neither REST expression, RNA splicing nor binding to RE1 sequence. Differential transcriptomic analysis revealed the upregulation of neuronal genes targeted by REST in wild‐type neural cells treated with X5050. This activity was confirmed in neural cells produced from human induced pluripotent stem cells derived from a HD patient. Acute intraventricular delivery of X5050 increased the expressions of BDNF and several other REST‐regulated genes in the prefrontal cortex of mice with quinolinate‐induced striatal lesions. This study demonstrates that the use of pluripotent stem cell derivatives can represent a crucial step toward the identification of pharmacological compounds with therapeutic potential in neurological affections involving decreased expression of neuronal genes associated to increased REST activity, such as Huntington disease. StemCells2013;31:1816‐1828

Published
2013
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