1
|
Werle SD, Ikonomi N, Schwab JD, Kraus JM, Weidner FM, Lenhard Rudolph K, Pfister AS, Schuler R, Kühl M, Kestler HA. Identification of dynamic driver sets controlling phenotypical landscapes. Comput Struct Biotechnol J 2022; 20:1603-1617. [PMID: 35465155 PMCID: PMC9010550 DOI: 10.1016/j.csbj.2022.03.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 03/30/2022] [Accepted: 03/30/2022] [Indexed: 11/03/2022] Open
Abstract
Controlling phenotypical landscapes is of vital interest to modern biology. This task becomes highly demanding because cellular decisions involve complex networks engaging in crosstalk interactions. Previous work on control theory indicates that small sets of compounds can control single phenotypes. However, a dynamic approach is missing to determine the drivers of the whole network dynamics. By analyzing 35 biologically motivated Boolean networks, we developed a method to identify small sets of compounds sufficient to decide on the entire phenotypical landscape. These compounds do not strictly prefer highly related compounds and show a smaller impact on the stability of the attractor landscape. The dynamic driver sets include many intervention targets and cellular reprogramming drivers in human networks. Finally, by using a new comprehensive model of colorectal cancer, we provide a complete workflow on how to implement our approach to shift from in silico to in vitro guided experiments.
Collapse
|
2
|
Georgolopoulos G, Psatha N, Iwata M, Nishida A, Som T, Yiangou M, Stamatoyannopoulos JA, Vierstra J. Discrete regulatory modules instruct hematopoietic lineage commitment and differentiation. Nat Commun 2021; 12:6790. [PMID: 34815405 PMCID: PMC8611072 DOI: 10.1038/s41467-021-27159-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 10/20/2021] [Indexed: 11/08/2022] Open
Abstract
Lineage commitment and differentiation is driven by the concerted action of master transcriptional regulators at their target chromatin sites. Multiple efforts have characterized the key transcription factors (TFs) that determine the various hematopoietic lineages. However, the temporal interactions between individual TFs and their chromatin targets during differentiation and how these interactions dictate lineage commitment remains poorly understood. Here we perform dense, daily, temporal profiling of chromatin accessibility (DNase I-seq) and gene expression changes (total RNA-seq) along ex vivo human erythropoiesis to comprehensively define developmentally regulated DNase I hypersensitive sites (DHSs) and transcripts. We link both distal DHSs to their target gene promoters and individual TFs to their target DHSs, revealing that the regulatory landscape is organized in distinct sequential regulatory modules that regulate lineage restriction and maturation. Finally, direct comparison of transcriptional dynamics (bulk and single-cell) and lineage potential between erythropoiesis and megakaryopoiesis uncovers differential fate commitment dynamics between the two lineages as they exit the stem and progenitor stage. Collectively, these data provide insights into the temporally regulated synergy of the cis- and the trans-regulatory components underlying hematopoietic lineage commitment and differentiation.
Collapse
Affiliation(s)
- Grigorios Georgolopoulos
- Altius Institute for Biomedical Sciences, Seattle, WA, USA.
- Department of Genetics, Development & Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece.
| | | | - Mineo Iwata
- Altius Institute for Biomedical Sciences, Seattle, WA, USA
| | - Andrew Nishida
- Altius Institute for Biomedical Sciences, Seattle, WA, USA
| | - Tannishtha Som
- Altius Institute for Biomedical Sciences, Seattle, WA, USA
| | - Minas Yiangou
- Department of Genetics, Development & Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - John A Stamatoyannopoulos
- Altius Institute for Biomedical Sciences, Seattle, WA, USA
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Division of Oncology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Jeff Vierstra
- Altius Institute for Biomedical Sciences, Seattle, WA, USA.
| |
Collapse
|
3
|
Giraud G, Kolovos P, Boltsis I, van Staalduinen J, Guyot B, Weiss-Gayet M, IJcken WV, Morlé F, Grosveld F. Interplay between FLI-1 and the LDB1 complex in murine erythroleukemia cells and during megakaryopoiesis. iScience 2021; 24:102210. [PMID: 33733070 PMCID: PMC7940982 DOI: 10.1016/j.isci.2021.102210] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 12/22/2020] [Accepted: 02/17/2021] [Indexed: 11/29/2022] Open
Abstract
Transcription factors are key players in a broad range of cellular processes such as cell-fate decision. Understanding how they act to control these processes is of critical importance for therapy purposes. FLI-1 controls several hematopoietic lineage differentiation including megakaryopoiesis and erythropoiesis. Its aberrant expression is often observed in cancer and is associated with poor prognosis. We showed that FLI-1 interacts with the LDB1 complex, which also plays critical roles in erythropoiesis and megakaryopoiesis. In this study, we aimed to unravel how FLI-1 and the LDB1 complex act together in murine erythroleukemia cells and in megakaryocyte. Combining omics techniques, we show that FLI-1 enables the recruitment of the LDB1 complex to regulatory sequences of megakaryocytic genes and to enhancers. We show as well for the first time that FLI-1 is able to modulate the 3D chromatin organization by promoting chromatin looping between enhancers and promoters most likely through the LDB1 complex. FLI-1 is important for the recruitment of the LDB1 complex FLI-1 is important for chromatin looping FLI-1 and the LDB1 complex co-regulate megakaryopoiesis
Collapse
Affiliation(s)
- Guillaume Giraud
- Department of Cell Biology, Erasmus Medical Centre, 3015CN Rotterdam, the Netherlands
| | - Petros Kolovos
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis 68100, Greece
| | - Ilias Boltsis
- Department of Cell Biology, Erasmus Medical Centre, 3015CN Rotterdam, the Netherlands
| | - Jente van Staalduinen
- Department of Cell Biology, Erasmus Medical Centre, 3015CN Rotterdam, the Netherlands
| | - Boris Guyot
- CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Lyon, France.,Inserm U1052, Centre de Recherche en Cancérologie de Lyon, Lyon, France.,Université de Lyon, Lyon, France.,Department of Immunity, Virus and Microenvironment, Lyon, France
| | - Michele Weiss-Gayet
- Institut NeuroMyoGène, CNRS UMR 5310 - INSERM U1217 - Université de Lyon - Université Claude Bernard Lyon 1, Lyon, France
| | - Wilfred van IJcken
- Biomics Center, Erasmus University Medical Center, 3015CN Rotterdam, the Netherlands
| | - François Morlé
- Institut NeuroMyoGène, CNRS UMR 5310 - INSERM U1217 - Université de Lyon - Université Claude Bernard Lyon 1, Lyon, France
| | - Frank Grosveld
- Department of Cell Biology, Erasmus Medical Centre, 3015CN Rotterdam, the Netherlands
| |
Collapse
|
4
|
Kwon N, Thompson EN, Mayday MY, Scanlon V, Lu YC, Krause DS. Current understanding of human megakaryocytic-erythroid progenitors and their fate determinants. Curr Opin Hematol 2021; 28:28-35. [PMID: 33186151 PMCID: PMC7737300 DOI: 10.1097/moh.0000000000000625] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
PURPOSE OF REVIEW This review focuses on our current understanding of fate decisions in bipotent megakaryocyte-erythroid progenitors (MEPs). Although extensive research has been carried out over decades, our understanding of how MEP commit to the erythroid versus megakaryocyte fate remains unclear. RECENT FINDINGS We discuss the isolation of primary human MEP, and focus on gene expression patterns, epigenetics, transcription factors and extrinsic factors that have been implicated in MEP fate determination. We conclude with an overview of the open debates in the field of MEP biology. SUMMARY Understanding MEP fate is important because defects in megakaryocyte and erythrocyte development lead to disease states such as anaemia, thrombocytopenia and leukaemia. MEP also represent a model system for studying fundamental principles underlying cell fate decisions of bipotent and pluripotent progenitors, such that discoveries in MEP are broadly applicable to stem/progenitor cell biology.
Collapse
Affiliation(s)
- Nayoung Kwon
- Department of Cell Biology, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Yale Stem Cell Center, Yale School of Medicine, 333 Cedar Street, New Haven, CT
| | - Evrett N. Thompson
- Department of Cell Biology, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Yale Stem Cell Center, Yale School of Medicine, 333 Cedar Street, New Haven, CT
| | - Madeline Y. Mayday
- Yale Stem Cell Center, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Department of Pathology, Yale School of Medicine, 333 Cedar Street, New Haven, CT
| | - Vanessa Scanlon
- Yale Stem Cell Center, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Department of Laboratory Medicine, Yale School of Medicine, 333 Cedar Street, New Haven, CT
| | - Yi-Chien Lu
- Yale Stem Cell Center, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Department of Pathology, Yale School of Medicine, 333 Cedar Street, New Haven, CT
| | - Diane S. Krause
- Department of Cell Biology, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Yale Stem Cell Center, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Department of Pathology, Yale School of Medicine, 333 Cedar Street, New Haven, CT
- Department of Laboratory Medicine, Yale School of Medicine, 333 Cedar Street, New Haven, CT
| |
Collapse
|
5
|
Ferguson DCJ, Mokim JH, Meinders M, Moody ERR, Williams TA, Cooke S, Trakarnsanga K, Daniels DE, Ferrer-Vicens I, Shoemark D, Tipgomut C, Macinnes KA, Wilson MC, Singleton BK, Frayne J. Characterization and evolutionary origin of novel C 2H 2 zinc finger protein (ZNF648) required for both erythroid and megakaryocyte differentiation in humans. Haematologica 2020; 106:2859-2873. [PMID: 33054117 PMCID: PMC8561289 DOI: 10.3324/haematol.2020.256347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Indexed: 01/01/2023] Open
Abstract
Human ZNF648 is a novel poly C-terminal C2H2 zinc finger protein identified amongst the most dysregulated proteins in erythroid cells differentiated from iPSC. Its nuclear localisation and structure indicate it is likely a DNA-binding protein. Using a combination of ZNF648 overexpression in an iPSC line and primary adult erythroid cells, ZNF648 knockdown in primary adult erythroid cells and megakaryocytes, comparative proteomics and transcriptomics we show that ZNF648 is required for both erythroid and megakaryocyte differentiation. Orthologues of ZNF648 were detected across Mammals, Reptilia, Actinopterygii, in some Aves, Amphibia and Coelacanthiformes suggesting the gene originated in the common ancestor of Osteichthyes (Euteleostomi or bony fish). Conservation of the C-terminal zinc finger domain is higher, with some variation in zinc finger number but a core of at least six zinc fingers conserved across all groups, with the N-terminus recognisably similar within but not between major lineages. This suggests the N-terminus of ZNF648 evolves faster than the C-terminus, however this is not due to exon-shuffling as the entire coding region of ZNF648 is within a single exon. As for other such transcription factors, the N-terminus likely carries out regulatory functions, but showed no sequence similarity to any known domains. The greater functional constraint on the zinc finger domain suggests ZNF648 binds at least some similar regions of DNA in the different organisms. However, divergence of the N-terminal region may enable differential expression, allowing adaptation of function in the different organisms.
Collapse
Affiliation(s)
- Daniel C. J. Ferguson
- School of Biochemistry, University of Bristol, Bristol, UK,*DCJF and JHM contributed equally as co-first authors
| | - Juraidah Haji Mokim
- School of Biochemistry, University of Bristol, Bristol, UK,*DCJF and JHM contributed equally as co-first authors
| | | | | | - Tom A. Williams
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - Sarah Cooke
- School of Biochemistry, University of Bristol, Bristol, UK
| | - Kongtana Trakarnsanga
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Deborah E. Daniels
- School of Biochemistry, University of Bristol, Bristol, UK,NIHR Blood and Transplant Research Unit in Red Blood Cell Products, University of Bristol, Bristol, UK
| | | | | | - Chartsiam Tipgomut
- Department of Biochemistry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Katherine A. Macinnes
- School of Biochemistry, University of Bristol, Bristol, UK,NIHR Blood and Transplant Research Unit in Red Blood Cell Products, University of Bristol, Bristol, UK
| | | | - Belinda K. Singleton
- NIHR Blood and Transplant Research Unit in Red Blood Cell Products, University of Bristol, Bristol, UK,Bristol Institute for Transfusion Sciences, National Health Service Blood and Transplant (NHSBT), Bristol, UK
| | - Jan Frayne
- School of Biochemistry, University of Bristol, BS8 1TD, UK.; NIHR Blood and Transplant Research Unit in Red blood cell products, University of Bristol, Bristol BS8 1TD, UK.
| |
Collapse
|
6
|
Effect of YAP/TAZ on megakaryocyte differentiation and platelet production. Biosci Rep 2020; 40:226046. [PMID: 32779719 PMCID: PMC7441484 DOI: 10.1042/bsr20201780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 08/04/2020] [Accepted: 08/10/2020] [Indexed: 12/22/2022] Open
Abstract
Platelet transfusion is required for life-threatening thrombocytopenic bleeding, and single donor platelet concentrate is the ideal transfusion product. However, due to the inadequate number of donors that can donate a large volume of platelets, in vitro platelets production could be an alternative. We developed an in vitro production system designed to increase the platelet production yield from cultured cells. Previously, we reported that depletion of a Hippo pathway core kinase (LATS1/2) inhibited platelet production from cultured megakaryocytes. In the present study, we further investigated the role of the Hippo pathway in megakaryocyte proliferation and platelet production by focusing on the role of its effector proteins (YAP and TAZ), which are down-stream targets of LATS1/2 kinase. We found that YAP plays an essential role in megakaryoblastic cell proliferation, maturation, and platelet production, while TAZ showed minor effect. Knockdown of YAP, either by genetic manipulation or pharmaceutical molecule, significantly increased caspase-3-mediated apoptosis in cultured megakaryocytes, and increased platelet production as opposed to overexpressing YAP. We, therefore, demonstrate a paradigm for the regulation of megakaryocyte development and platelet production via the Hippo signaling pathway, and suggest the potential use of an FDA-approved drug to induce higher platelet production in cultured cells.
Collapse
|
7
|
Wang H, Lin X, Liu E, Jian Z, Ou Y. MicroRNA-33b regulates hepatocellular carcinoma cell proliferation, apoptosis, and mobility via targeting Fli-1-mediated Notch1 pathway. J Cell Physiol 2020; 235:7635-7644. [PMID: 32239672 DOI: 10.1002/jcp.29673] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 03/10/2020] [Indexed: 12/27/2022]
Abstract
MicroRNAs (miRNAs) have been confirmed to play pivotal roles in hepatocellular carcinoma (HCC) carcinogenesis. However, the underlying function of microRNA-33b (miR-33b) in HCC remains unclear. Here, we found that miR-33b level was significantly reduced in both HCC tissues and tumor cell lines. Further, luciferase reporter assay and western blot analysis confirmed that Friend leukemia virus integration 1 (Fli-1) was a direct target of miR-33b. Overexpression of miR-33b dramatically suppressed HCC tumor cell proliferation and cell mobility, but facilitated tumor cell apoptosis in vitro. Besides, restoration of Fli-1 partially attenuated miR-33b-mediated inhibition of cell growth and metastasis via activating Notch1 signaling and its downstream effectors. Our findings demonstrate the important role of miR-33b/Fli-1 axis in HCC progression and provide novel therapeutic candidates for HCC clinical treatment.
Collapse
Affiliation(s)
- Huiling Wang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Xingtao Lin
- Department of Pathology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Entao Liu
- Weilun PET Center, Department of Nuclear Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Zhixiang Jian
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Yingliang Ou
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| |
Collapse
|
8
|
Terao C, Momozawa Y, Ishigaki K, Kawakami E, Akiyama M, Loh PR, Genovese G, Sugishita H, Ohta T, Hirata M, Perry JRB, Matsuda K, Murakami Y, Kubo M, Kamatani Y. GWAS of mosaic loss of chromosome Y highlights genetic effects on blood cell differentiation. Nat Commun 2019; 10:4719. [PMID: 31624269 PMCID: PMC6797717 DOI: 10.1038/s41467-019-12705-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 09/18/2019] [Indexed: 12/28/2022] Open
Abstract
Mosaic loss of chromosome Y (mLOY) is frequently observed in the leukocytes of ageing men. However, the genetic architecture and biological mechanisms underlying mLOY are not fully understood. In a cohort of 95,380 Japanese men, we identify 50 independent genetic markers in 46 loci associated with mLOY at a genome-wide significant level, 35 of which are unreported. Lead markers overlap enhancer marks in hematopoietic stem cells (HSCs, P ≤ 1.0 × 10−6). mLOY genome-wide association study signals exhibit polygenic architecture and demonstrate strong heritability enrichment in regions surrounding genes specifically expressed in multipotent progenitor (MPP) cells and HSCs (P ≤ 3.5 × 10−6). ChIP-seq data demonstrate that binding sites of FLI1, a fate-determining factor promoting HSC differentiation into platelets rather than red blood cells (RBCs), show a strong heritability enrichment (P = 1.5 × 10−6). Consistent with these findings, platelet and RBC counts are positively and negatively associated with mLOY, respectively. Collectively, our observations improve our understanding of the mechanisms underlying mLOY. Mosaic loss of chromosome Y (mLOY) is associated with age and smoking but also genetic factors play a role. Here, Terao et al. perform GWAS for mLOY in 95,380 Japanese men and identify 46 loci that overlap with hematopoietic stem cell enhancers and transcription factor binding sites critical for hematopoiesis.
Collapse
Affiliation(s)
- Chikashi Terao
- Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Kanagawa, 230-0045, Japan. .,Clinical Research Center, Shizuoka General Hospital, Shizuoka, 420-8527, Japan. .,The Department of Applied Genetics, The School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, 422-8526, Japan.
| | - Yukihide Momozawa
- Laboratory for Genotyping Development, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, 230-0045, Japan
| | - Kazuyoshi Ishigaki
- Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Kanagawa, 230-0045, Japan
| | - Eiryo Kawakami
- Healthcare and Medical Data Driven AI based Predictive Reasoning Development Unit, Medical Sciences Innovation Hub Program (MIH), RIKEN, Kanagawa, 230-0045, Japan.,Laboratory for Developmental Genetics, Center for Integrative Medical Sciences (IMS), RIKEN, Yokohama, Kanagawa, 230-0045, Japan.,Artificial Intelligence Medicine, Graduate School of Medicine, Chiba University, Chiba, 260-8670, Japan
| | - Masato Akiyama
- Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Kanagawa, 230-0045, Japan.,Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Po-Ru Loh
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA.,Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Giulio Genovese
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA.,Department of Genetics, Harvard Medical School, Boston, MA, 02115, USA.,Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Hiroki Sugishita
- Laboratory for Developmental Genetics, RIKEN Center for Integrative Medical Science (IMS), Yokohama, Kanagawa, 230-0045, Japan
| | - Tazro Ohta
- Database Center for Life Science, Joint Support-Center for Data Science Research, Research Organization of Information and Systems, Mishima, Shizuoka, 411-8540, Japan
| | - Makoto Hirata
- Laboratory of Genome Technology, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, 108-8639, Japan
| | - John R B Perry
- MRC Epidemiology Unit, School of Clinical Medicine, University of Cambridge, Cambridge, CB2 0SP, UK
| | - Koichi Matsuda
- Laboratory of Genome Technology, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, 108-8639, Japan.,Laboratory of Clinical Genome Sequencing, Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, 108-8639, Japan
| | - Yoshinori Murakami
- Division of Molecular Pathology, Institute of Medical Science, The University of Tokyo, Tokyo, 108-8639, Japan
| | - Michiaki Kubo
- Laboratory for Genotyping Development, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa, 230-0045, Japan
| | - Yoichiro Kamatani
- Laboratory for Statistical and Translational Genetics, RIKEN Center for Integrative Medical Sciences, Kanagawa, 230-0045, Japan. .,Laboratory of Complex Trait Genomics, Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, 108-8639, Japan.
| |
Collapse
|
9
|
Sun XL, Wang L, Yuan WP, Wang WL. [The role of PDK1 in the transition of endothelial to hematopoietic cells]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2019; 39:709-716. [PMID: 30369179 PMCID: PMC7342253 DOI: 10.3760/cma.j.issn.0253-2727.2018.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
目的 研究磷酸肌醇依赖性激酶1(PDK1)在内皮细胞向造血细胞转化阶段对造血干细胞(HSC)发生的影响。 方法 应用Vec-Cre在内皮细胞中特异性敲除PDK1基因,取对照组PDK1fl/fl、PDK1fl/+小鼠及敲除组Vec-Cre;PDK1fl/fl小鼠胚胎的主动脉-性腺-中肾区(AGM区)细胞进行集落形成实验,检测PDK1基因对造血祖细胞功能的影响;取对照组和敲除组AGM区细胞行移植实验,检测PDK1对HSC功能的影响;取对照组和敲除组AGM区细胞,通过流式细胞术检测PDK1对能够向造血转化的CD31+c-Kithigh细胞群比例、细胞周期及细胞凋亡的影响;分选对照组和敲除组AGM区CD31+c-Kithigh细胞群,通过Real-time PCR检测PDK1对内皮向造血转换相关的转录因子(RUNX1、P2-RUNX1、GATA2)的影响。 结果 PDK1敲除后,造血祖细胞形成的克隆形态变小,数目减少[敲除组CFU-GM为(24±5)个/ee,对照组为(62±1)个/ee,P=0.001];破坏了造血干细胞重建造血及多向分化的能力(敲除组移植5只,0只重建,对照组移植7只,5只重建,P=0.001);AGM区CD31+c-Kithigh比例降低[敲除组CD31+c-Kithigh比例为(0.145±0.017)%,对照组比例为(0.385±0.04)%,P=0.001];并且AGM区由内皮细胞向造血细胞转换的关键转录因子表达下降,但对CD31+c-Kithigh细胞的增殖和凋亡无明显影响。 结论 在内皮细胞中特异敲除PDK1基因,导致具有向造血转化的内皮细胞群比例降低,影响了HSC的发生,破坏了HSC重建造血的能力。
Collapse
Affiliation(s)
- X L Sun
- Institute of Hematology & Blood Diseases Hospital, CAMS & PUMC, State Key Laboratory of Experimental Hematology, Tianjin 300020, China
| | | | | | - W L Wang
- Institute of Hematology & Blood Diseases Hospital, CAMS & PUMC, State Key Laboratory of Experimental Hematology, Tianjin 300020, China
| |
Collapse
|
10
|
|
11
|
Wang H, Ou Y, Ou J, Jian Z. Fli‑1 promotes metastasis by regulating MMP2 signaling in hepatocellular carcinoma. Mol Med Rep 2017; 17:1986-1992. [PMID: 29138848 DOI: 10.3892/mmr.2017.8047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 11/03/2017] [Indexed: 11/06/2022] Open
Affiliation(s)
- Huiling Wang
- Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Yingliang Ou
- Department of General Surgery, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Jinrui Ou
- Department of General Surgery, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Zhixiang Jian
- Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| |
Collapse
|
12
|
FLI1 level during megakaryopoiesis affects thrombopoiesis and platelet biology. Blood 2017; 129:3486-3494. [PMID: 28432223 DOI: 10.1182/blood-2017-02-770958] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 04/14/2017] [Indexed: 12/17/2022] Open
Abstract
Friend leukemia virus integration 1 (FLI1), a critical transcription factor (TF) during megakaryocyte differentiation, is among genes hemizygously deleted in Jacobsen syndrome, resulting in a macrothrombocytopenia termed Paris-Trousseau syndrome (PTSx). Recently, heterozygote human FLI1 mutations have been ascribed to cause thrombocytopenia. We studied induced-pluripotent stem cell (iPSC)-derived megakaryocytes (iMegs) to better understand these clinical disorders, beginning with iPSCs generated from a patient with PTSx and iPSCs from a control line with a targeted heterozygous FLI1 knockout (FLI1+/-). PTSx and FLI1+/- iMegs replicate many of the described megakaryocyte/platelet features, including a decrease in iMeg yield and fewer platelets released per iMeg. Platelets released in vivo from infusion of these iMegs had poor half-lives and functionality. We noted that the closely linked E26 transformation-specific proto-oncogene 1 (ETS1) is overexpressed in these FLI1-deficient iMegs, suggesting FLI1 negatively regulates ETS1 in megakaryopoiesis. Finally, we examined whether FLI1 overexpression would affect megakaryopoiesis and thrombopoiesis. We found increased yield of noninjured, in vitro iMeg yield and increased in vivo yield, half-life, and functionality of released platelets. These studies confirm FLI1 heterozygosity results in pleiotropic defects similar to those noted with other critical megakaryocyte-specific TFs; however, unlike those TFs, FLI1 overexpression improved yield and functionality.
Collapse
|
13
|
Beauchemin H, Shooshtarizadeh P, Vadnais C, Vassen L, Pastore YD, Möröy T. Gfi1b controls integrin signaling-dependent cytoskeleton dynamics and organization in megakaryocytes. Haematologica 2017; 102:484-497. [PMID: 28082345 PMCID: PMC5394960 DOI: 10.3324/haematol.2016.150375] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 01/11/2017] [Indexed: 12/27/2022] Open
Abstract
Mutations in GFI1B are associated with inherited bleeding disorders called GFI1B-related thrombocytopenias. We show here that mice with a megakaryocyte-specific Gfi1b deletion exhibit a macrothrombocytopenic phenotype along a megakaryocytic dysplasia reminiscent of GFI1B-related thrombocytopenia. GFI1B deficiency increases megakaryocyte proliferation and affects their ploidy, but also abrogates their responsiveness towards integrin signaling and their ability to spread and reorganize their cytoskeleton. Gfi1b-null megakaryocytes are also unable to form proplatelets, a process independent of integrin signaling. GFI1B-deficient megakaryocytes exhibit aberrant expression of several components of both the actin and microtubule cytoskeleton, with a dramatic reduction of α-tubulin. Inhibition of FAK or ROCK, both important for actin cytoskeleton organization and integrin signaling, only partially restored their response to integrin ligands, but the inhibition of PAK, a regulator of the actin cytoskeleton, completely rescued the responsiveness of Gfi1b-null megakaryocytes to ligands, but not their ability to form proplatelets. We conclude that Gfi1b controls major functions of megakaryocytes such as integrin-dependent cytoskeleton organization, spreading and migration through the regulation of PAK activity whereas the proplatelet formation defect in GFI1B-deficient megakaryocytes is due, at least partially, to an insufficient α-tubulin content.
Collapse
Affiliation(s)
| | | | - Charles Vadnais
- Institut de Recherches Cliniques de Montréal, IRCM, QC, Canada
| | - Lothar Vassen
- Institut de Recherches Cliniques de Montréal, IRCM, QC, Canada
| | - Yves D Pastore
- Département de Pédiatrie, Service d'Hématologie et Oncologie, CHU Ste-Justine, Montréal, QC, Canada
| | - Tarik Möröy
- Institut de Recherches Cliniques de Montréal, IRCM, QC, Canada .,Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, QC, Canada.,Division of Experimental Medicine, McGill University, Montréal, QC, Canada
| |
Collapse
|
14
|
Zang C, Luyten A, Chen J, Liu XS, Shivdasani RA. NF-E2, FLI1 and RUNX1 collaborate at areas of dynamic chromatin to activate transcription in mature mouse megakaryocytes. Sci Rep 2016; 6:30255. [PMID: 27457419 PMCID: PMC4960521 DOI: 10.1038/srep30255] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 07/01/2016] [Indexed: 12/16/2022] Open
Abstract
Mutations in mouse and human Nfe2, Fli1 and Runx1 cause thrombocytopenia. We applied genome-wide chromatin dynamics and ChIP-seq to determine these transcription factors’ (TFs) activities in terminal megakaryocyte (MK) maturation. Enhancers with H3K4me2-marked nucleosome pairs were most enriched for NF-E2, FLI and RUNX sequence motifs, suggesting that this TF triad controls much of the late MK program. ChIP-seq revealed NF-E2 occupancy near previously implicated target genes, whose expression is compromised in Nfe2-null cells, and many other genes that become active late in MK differentiation. FLI and RUNX were also the motifs most enriched near NF-E2 binding sites and ChIP-seq implicated FLI1 and RUNX1 in activation of late MK, including NF-E2-dependent, genes. Histones showed limited activation in regions of single TF binding, while enhancers that bind NF-E2 and either RUNX1, FLI1 or both TFs gave the highest signals for TF occupancy and H3K4me2; these enhancers associated best with genes activated late in MK maturation. Thus, three essential TFs co-occupy late-acting cis-elements and show evidence for additive activity at genes responsible for platelet assembly and release. These findings provide a rich dataset of TF and chromatin dynamics in primary MK and explain why individual TF losses cause thrombopocytopenia.
Collapse
Affiliation(s)
- Chongzhi Zang
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard T.H. Chan School of Public Health, Boston, MA 02215, USA.,Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Annouck Luyten
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA.,Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.,Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Justina Chen
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA.,Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - X Shirley Liu
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard T.H. Chan School of Public Health, Boston, MA 02215, USA.,Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Ramesh A Shivdasani
- Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215, USA.,Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.,Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.,Department of Pediatric Hematology/Oncology, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA
| |
Collapse
|
15
|
Sakurai K, Fujiwara T, Hasegawa S, Okitsu Y, Fukuhara N, Onishi Y, Yamada-Fujiwara M, Ichinohasama R, Harigae H. Inhibition of human primary megakaryocyte differentiation by anagrelide: a gene expression profiling analysis. Int J Hematol 2016; 104:190-9. [DOI: 10.1007/s12185-016-2006-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 04/05/2016] [Accepted: 04/05/2016] [Indexed: 11/29/2022]
|
16
|
The biology of pediatric acute megakaryoblastic leukemia. Blood 2015; 126:943-9. [PMID: 26186939 DOI: 10.1182/blood-2015-05-567859] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Accepted: 07/15/2015] [Indexed: 12/21/2022] Open
Abstract
Acute megakaryoblastic leukemia (AMKL) comprises between 4% and 15% of newly diagnosed pediatric acute myeloid leukemia patients. AMKL in children with Down syndrome (DS) is characterized by a founding GATA1 mutation that cooperates with trisomy 21, followed by the acquisition of additional somatic mutations. In contrast, non-DS-AMKL is characterized by chimeric oncogenes consisting of genes known to play a role in normal hematopoiesis. CBFA2T3-GLIS2 is the most frequent chimeric oncogene identified to date in this subset of patients and confers a poor prognosis.
Collapse
|
17
|
Guo T, Wang X, Qu Y, Yin Y, Jing T, Zhang Q. Megakaryopoiesis and platelet production: insight into hematopoietic stem cell proliferation and differentiation. Stem Cell Investig 2015; 2:3. [PMID: 27358871 DOI: 10.3978/j.issn.2306-9759.2015.02.01] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Accepted: 02/06/2015] [Indexed: 12/12/2022]
Abstract
Hematopoietic stem cells (HSCs) undergo successive lineage commitment steps to generate megakaryocytes (MKs) in a process referred to as megakaryopoiesis. MKs undergo a unique differentiation process involving endomitosis to eventually produce platelets. Many transcription factors participate in the regulation of this complex progress. Chemokines and other factors in the microenvironment where megakaryopoiesis and platelet production occur play vital roles in the regulation of HSC lineage commitment and MK maturation; among these factors, thrombopoietin (TPO) is the most important. Endomitosis is a vital process of MK maturation, and granules that are formed in MKs are important for platelet function. Proplatelets are firstly generated from mature MKs and then become platelets. The proplatelet production process was verified by novel studies that revealed that the mechanism is partially regulated by the invaginated membrane system (IMS), microtubules and Rho GTPases. The extracellular matrices (ECMs) and shear stress also affect and regulate the process while the mature MKs migrate from the marrow to the sub-endothelium region near the venous sinusoids leading to the release of platelets into the circulation. This review describes the entire process of megakaryopoiesis in detail, illustrates both the transcriptional and microenvironmental regulation of MKs and provides insight into platelet biogenesis.
Collapse
Affiliation(s)
- Tianyu Guo
- 1 State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China ; 2 Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen 518057, China
| | - Xuejun Wang
- 1 State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China ; 2 Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen 518057, China
| | - Yigong Qu
- 1 State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China ; 2 Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen 518057, China
| | - Yu Yin
- 1 State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China ; 2 Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen 518057, China
| | - Tao Jing
- 1 State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China ; 2 Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen 518057, China
| | - Qing Zhang
- 1 State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China ; 2 Research Institute of Sun Yat-Sen University in Shenzhen, Shenzhen 518057, China
| |
Collapse
|
18
|
Scheiber MN, Watson PM, Rumboldt T, Stanley C, Wilson RC, Findlay VJ, Anderson PE, Watson DK. FLI1 expression is correlated with breast cancer cellular growth, migration, and invasion and altered gene expression. Neoplasia 2014; 16:801-13. [PMID: 25379017 PMCID: PMC4212256 DOI: 10.1016/j.neo.2014.08.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 08/15/2014] [Indexed: 12/21/2022] Open
Abstract
ETS factors have been shown to be dysregulated in breast cancer. ETS factors control the expression of genes involved in many biological processes, such as cellular proliferation, differentiation, and apoptosis. FLI1 is an ETS protein aberrantly expressed in retrovirus-induced hematological tumors, but limited attention has been directed towards elucidating the role of FLI1 in epithelial-derived cancers. Using data mining, we show that loss of FLI1 expression is associated with shorter survival and more aggressive phenotypes of breast cancer. Gain and loss of function cellular studies indicate the inhibitory effect of FLI1 expression on cellular growth, migration, and invasion. Using Fli1 mutant mice and both a transgenic murine breast cancer model and an orthotopic injection of syngeneic tumor cells indicates that reduced Fli1 contributes to accelerated tumor growth. Global expression analysis and RNA-Seq data from an invasive human breast cancer cell line with over expression of either FLI1 and another ETS gene, PDEF, shows changes in several cellular pathways associated with cancer, such as the cytokine-cytokine receptor interaction and PI3K-Akt signaling pathways. This study demonstrates a novel role for FLI1 in epithelial cells. In addition, these results reveal that FLI1 down-regulation in breast cancer may promote tumor progression.
Collapse
Key Words
- Ad-FLI1, Ad-GFP-FLI1
- EMT, Epithelial-mesenchymal transition
- ER, Estrogen receptor
- FLI1, Friend leukemia virus integration 1
- GAPDH, Glyceraldehyde-3-phosphate dehydrogenase
- GEO, Gene Expression Omnibus
- GOBO, Gene expression-based Outcome for Breast cancer Online
- IDC, Invasive ductal carcinoma
- IHC, Immunohistochemistry
- ILC, Invasive lobular carcinoma
- N, Normal Breast Tissue
- PDEF, Prostate-derived ETS factor
- PyVT, FVB/N-Tg(MMTV-PyVT)634Mul/J
- Rb, Retinoblastoma
- T, Tumor
- uPA, Urokinase plasminogen activator
Collapse
Affiliation(s)
- Melissa N Scheiber
- Department of Pathology and Laboratory Medicine, The James E. Clyburn Research Center, Medical University of South Carolina, 68 President Street, Charleston, SC 29425
| | - Patricia M Watson
- Department of Medicine, Division of Hematology/Oncology, The James E. Clyburn Research Center, Medical University of South Carolina, 68 President Street, Charleston, SC 29425
| | - Tihana Rumboldt
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Children's Hospital, 171 Ashley Avenue, Charleston, SC 29425
| | - Connor Stanley
- Department of Computer Science, College of Charleston, Charleston, SC 29424
| | - Robert C Wilson
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, The James E. Clyburn Research Center, Medical University of South Carolina, 68 President Street, Charleston, SC 29425
| | - Victoria J Findlay
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Walton Research Building, 39 Sabin Street, Charleston, SC 29425
| | - Paul E Anderson
- Department of Computer Science, College of Charleston, Charleston, SC 29424
| | - Dennis K Watson
- Department of Pathology and Laboratory Medicine, The James E. Clyburn Research Center, Medical University of South Carolina, 68 President Street, Charleston, SC 29425
| |
Collapse
|
19
|
Zeddies S, Jansen SBG, di Summa F, Geerts D, Zwaginga JJ, van der Schoot CE, von Lindern M, Thijssen-Timmer DC. MEIS1 regulates early erythroid and megakaryocytic cell fate. Haematologica 2014; 99:1555-64. [PMID: 25107888 DOI: 10.3324/haematol.2014.106567] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
MEIS1 is a transcription factor expressed in hematopoietic stem and progenitor cells and in mature megakaryocytes. This biphasic expression of MEIS1 suggests that the function of MEIS1 in stem cells is distinct from its function in lineage committed cells. Mouse models show that Meis1 is required for renewal of stem cells, but the function of MEIS1 in human hematopoietic progenitor cells has not been investigated. We show that two MEIS1 splice variants are expressed in hematopoietic progenitor cells. Constitutive expression of both variants directed human hematopoietic progenitors towards a megakaryocyte-erythrocyte progenitor fate. Ectopic expression of either MEIS1 splice variant in common myeloid progenitor cells, and even in granulocyte-monocyte progenitors, resulted in increased erythroid differentiation at the expense of granulocyte and macrophage differentiation. Conversely, silencing MEIS1 expression in progenitor cells induced a block in erythroid expansion and decreased megakaryocytic colony formation capacity. Gene expression profiling revealed that both MEIS1 splice variants induce a transcriptional program enriched for erythroid and megakaryocytic genes. Our results indicate that MEIS1 expression induces lineage commitment towards a megakaryocyte-erythroid progenitor cell fate in common myeloid progenitor cells through activation of genes that define a megakaryocyte-erythroid-specific gene expression program.
Collapse
Affiliation(s)
| | | | | | - Dirk Geerts
- Department of Pediatric Oncology, Erasmus Medical Center Rotterdam, Sanquin Blood Supply, Leiden, The Netherlands
| | - Jaap J Zwaginga
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center and the Jon J van Rood Center for Clinical Transfusion Research, Sanquin Blood Supply, Leiden, The Netherlands
| | - C Ellen van der Schoot
- Department of Experimental Immunohematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Center Amsterdam, Sanquin Blood Supply, Leiden, The Netherlands
| | | | | |
Collapse
|
20
|
Duncan MT, Shin S, Wu JJ, Mays Z, Weng S, Bagheri N, Miller WM, Shea LD. Dynamic transcription factor activity profiles reveal key regulatory interactions during megakaryocytic and erythroid differentiation. Biotechnol Bioeng 2014; 111:2082-94. [PMID: 24853077 DOI: 10.1002/bit.25262] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 02/23/2014] [Accepted: 03/31/2014] [Indexed: 01/19/2023]
Abstract
The directed differentiation toward erythroid (E) or megakaryocytic (MK) lineages by the MK-E progenitor (MEP) could enhance the ex vivo generation of red blood cells and platelets for therapeutic transfusions. The lineage choice at the MEP bifurcation is controlled in large part by activity within the intracellular signal transduction network, the output of which determines the activity of transcription factors (TFs) and ultimately gene expression. Although many TFs have been implicated, E or MK differentiation is a complex process requiring multiple days, and the dynamics of TF activities during commitment and terminal maturation are relatively unexplored. Herein, we applied a living cell array for the large-scale, dynamic quantification of TF activities during MEP bifurcation. A panel of hematopoietic TFs (GATA-1, GATA-2, SCL/TAL1, FLI-1, NF-E2, PU.1, c-Myb) was characterized during E and MK differentiation of bipotent K562 cells. Dynamic TF activity profiles associated with differentiation towards each lineage were identified, and validated with previous reports. From these activity profiles, we show that GATA-1 is an important hub during early hemin- and PMA-induced differentiation, and reveal several characteristic TF interactions for E and MK differentiation that confirm regulatory mechanisms documented in the literature. Additionally, we highlight several novel TF interactions at various stages of E and MK differentiation. Furthermore, we investigated the mechanism by which nicotinamide (NIC) promoted terminal MK maturation using an MK-committed cell line, CHRF-288-11 (CHRF). Concomitant with its enhancement of ploidy, NIC strongly enhanced the activity of three TFs with known involvement in terminal MK maturation: FLI-1, NF-E2, and p53. Dynamic profiling of TF activity represents a novel tool to complement traditional assays focused on mRNA and protein expression levels to understand progenitor cell differentiation.
Collapse
Affiliation(s)
- Mark T Duncan
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208
| | | | | | | | | | | | | | | |
Collapse
|
21
|
Findlay VJ, LaRue AC, Turner DP, Watson PM, Watson DK. Understanding the role of ETS-mediated gene regulation in complex biological processes. Adv Cancer Res 2014; 119:1-61. [PMID: 23870508 DOI: 10.1016/b978-0-12-407190-2.00001-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Ets factors are members of one of the largest families of evolutionarily conserved transcription factors, regulating critical functions in normal cell homeostasis, which when perturbed contribute to tumor progression. The well-documented alterations in ETS factor expression and function during cancer progression result in pleiotropic effects manifested by the downstream effect on their target genes. Multiple ETS factors bind to the same regulatory sites present on target genes, suggesting redundant or competitive functions. The anti- and prometastatic signatures obtained by examining specific ETS regulatory networks will significantly improve our ability to accurately predict tumor progression and advance our understanding of gene regulation in cancer. Coordination of multiple ETS gene functions also mediates interactions between tumor and stromal cells and thus contributes to the cancer phenotype. As such, these new insights may provide a novel view of the ETS gene family as well as a focal point for studying the complex biological control involved in tumor progression. One of the goals of molecular biology is to elucidate the mechanisms that contribute to the development and progression of cancer. Such an understanding of the molecular basis of cancer will provide new possibilities for: (1) earlier detection, as well as better diagnosis and staging of disease; (2) detection of minimal residual disease recurrences and evaluation of response to therapy; (3) prevention; and (4) novel treatment strategies. Increased understanding of ETS-regulated biological pathways will directly impact these areas.
Collapse
Affiliation(s)
- Victoria J Findlay
- Department of Pathology and Laboratory Medicine, Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina, USA
| | | | | | | | | |
Collapse
|
22
|
Suzuki E, Williams S, Sato S, Gilkeson G, Watson DK, Zhang XK. The transcription factor Fli-1 regulates monocyte, macrophage and dendritic cell development in mice. Immunology 2013; 139:318-27. [PMID: 23320737 DOI: 10.1111/imm.12070] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Revised: 01/08/2013] [Accepted: 01/08/2013] [Indexed: 12/28/2022] Open
Abstract
Fli-1 belongs to the Ets transcription factor family and is expressed in haematopoietic cells, including most of the cells that are active in immunity. The mononuclear phagocytes, i.e. monocytes, macrophages and dendritic cells, originate in haematopoietic stem cells and play an important role in immunity. To assess the role of Fli-1 in mononuclear phagocyte development in vivo, we generated mice that express a truncated Fli-1 protein, lacking the C-terminal transcriptional activation domain (Fli-1(Δ) (CTA) ). Fli-1(Δ) (CTA) (/Δ) (CTA) mice had significantly increased populations of haematopoietic stem cells and common dendritic cell precursors in bone marrow compared with wild-type littermates. Significantly increased classical dendritic cells, plasmacytoid dendritic cells, and macrophage populations were found in spleens from Fli-1(∆) (CTA) (/∆) (CTA) mice compared with wild-type littermates. Fli-1(Δ) (CTA) (/Δ) (CTA) mice also had increased pre-classical dendritic cell and monocyte populations in peripheral blood mononuclear cells. Furthermore, bone marrow reconstitution studies demonstrated that expression of Fli-1 in both haematopoietic cells and stromal cells affected mononuclear phagocyte development in mice. Expression of Fms-like tyrosine kinase 3 ligand (Flt3L), a haematopoietic growth factor, in multipotent progenitors was statistically significantly increased from Fli-1(∆) (CTA) (/∆) (CTA) mice compared with wild-type littermates. Fli-1 protein binds directly to the promoter region of the Flt3L gene. Hence, Fli-1 plays an important role in the mononuclear phagocyte development, and the C-terminal transcriptional activation domain of Fli-1 negatively modulates mononuclear phagocyte development.
Collapse
Affiliation(s)
- Eiji Suzuki
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina, Charleston, SC, USA
| | | | | | | | | | | |
Collapse
|
23
|
Smeets MFMA, Chan AC, Dagger S, Bradley CK, Wei A, Izon DJ. Fli-1 overexpression in hematopoietic progenitors deregulates T cell development and induces pre-T cell lymphoblastic leukaemia/lymphoma. PLoS One 2013; 8:e62346. [PMID: 23667468 PMCID: PMC3646842 DOI: 10.1371/journal.pone.0062346] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 03/20/2013] [Indexed: 12/28/2022] Open
Abstract
The Ets transcription factor Fli-1 is preferentially expressed in hematopoietic tissues and cells, including immature T cells, but the role of Fli-1 in T cell development has not been closely examined. To address this we retrovirally overexpressed Fli-1 in various in vitro and in vivo settings and analysed its effect on T cell development. We found that Fli-1 overexpression perturbed the DN to DP transition and inhibited CD4 development whilst enhancing CD8 development both in vitro and in vivo. Surprisingly, Fli-1 overexpression in vivo eventuated in development of pre-T cell lymphoblastic leukaemia/lymphoma (pre-T LBL). Known Fli-1 target genes such as the pro-survival Bcl-2 family members were not found to be upregulated. In contrast, we found increased NOTCH1 expression in all Fli-1 T cells and detected Notch1 mutations in all tumours. These data show a novel function for Fli-1 in T cell development and leukaemogenesis and provide a new mouse model of pre-T LBL to identify treatment options that target the Fli-1 and Notch1 signalling pathways.
Collapse
Affiliation(s)
- Monique F. M. A. Smeets
- Haematology and Leukaemia Unit, St. Vincent’s Institute, University of Melbourne, Fitzroy, Victoria, Australia
| | - Angela C. Chan
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
| | - Samantha Dagger
- School of Pathology and Laboratory Medicine, University of Western Australia, Crawley, Western Australia, Australia
| | | | - Andrew Wei
- Department of Clinical Haematology, The Alfred Hospital and The Australian Centre for Blood Diseases, Monash University, Melbourne, Victoria, Australia
| | - David J. Izon
- Haematology and Leukaemia Unit, St. Vincent’s Institute, University of Melbourne, Fitzroy, Victoria, Australia
- * E-mail:
| |
Collapse
|
24
|
Gruber TA, Gedman AL, Zhang J, Koss CS, Marada S, Ta HQ, Chen SC, Su X, Ogden SK, Dang J, Wu G, Gupta V, Andersson AK, Pounds S, Shi L, Easton J, Barbato MI, Mulder HL, Manne J, Wang J, Rusch M, Ranade S, Ganti R, Parker M, Ma J, Radtke I, Ding L, Cazzaniga G, Biondi A, Kornblau SM, Ravandi F, Kantarjian H, Nimer SD, Döhner K, Döhner H, Ley TJ, Ballerini P, Shurtleff S, Tomizawa D, Adachi S, Hayashi Y, Tawa A, Shih LY, Liang DC, Rubnitz JE, Pui CH, Mardis ER, Wilson RK, Downing JR. An Inv(16)(p13.3q24.3)-encoded CBFA2T3-GLIS2 fusion protein defines an aggressive subtype of pediatric acute megakaryoblastic leukemia. Cancer Cell 2012; 22:683-97. [PMID: 23153540 PMCID: PMC3547667 DOI: 10.1016/j.ccr.2012.10.007] [Citation(s) in RCA: 180] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Revised: 09/05/2012] [Accepted: 10/17/2012] [Indexed: 01/12/2023]
Abstract
To define the mutation spectrum in non-Down syndrome acute megakaryoblastic leukemia (non-DS-AMKL), we performed transcriptome sequencing on diagnostic blasts from 14 pediatric patients and validated our findings in a recurrency/validation cohort consisting of 34 pediatric and 28 adult AMKL samples. Our analysis identified a cryptic chromosome 16 inversion (inv(16)(p13.3q24.3)) in 27% of pediatric cases, which encodes a CBFA2T3-GLIS2 fusion protein. Expression of CBFA2T3-GLIS2 in Drosophila and murine hematopoietic cells induced bone morphogenic protein (BMP) signaling and resulted in a marked increase in the self-renewal capacity of hematopoietic progenitors. These data suggest that expression of CBFA2T3-GLIS2 directly contributes to leukemogenesis.
Collapse
MESH Headings
- Animals
- Bone Morphogenetic Proteins/metabolism
- Child
- Chromosome Inversion
- Chromosomes, Human, Pair 16
- Drosophila/genetics
- Drosophila/growth & development
- Gene Expression Profiling
- Humans
- Kruppel-Like Transcription Factors/genetics
- Leukemia, Megakaryoblastic, Acute/classification
- Leukemia, Megakaryoblastic, Acute/diagnosis
- Leukemia, Megakaryoblastic, Acute/genetics
- Mice
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Oncogene Proteins, Fusion/physiology
- Prognosis
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Recombinant Fusion Proteins/physiology
- Repressor Proteins/genetics
- Sequence Analysis, RNA
- Signal Transduction
- Tumor Suppressor Proteins/genetics
Collapse
Affiliation(s)
- Tanja A. Gruber
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Amanda Larson Gedman
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jinghui Zhang
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Cary S. Koss
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Suresh Marada
- Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Huy Q. Ta
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Shann-Ching Chen
- Hartwell Center for Biotechnology and Bioinformatics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Xiaoping Su
- Department of Bioinformatics and Computational Biology, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Stacey K. Ogden
- Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jinjun Dang
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Gang Wu
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Vedant Gupta
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Anna K. Andersson
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Stanley Pounds
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Lei Shi
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - John Easton
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Pediatric Cancer Genome Project, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Michael I. Barbato
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Pediatric Cancer Genome Project, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Heather L. Mulder
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Pediatric Cancer Genome Project, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jayanthi Manne
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Pediatric Cancer Genome Project, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jianmin Wang
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Information Sciences, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Michael Rusch
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | | | - Ramapriya Ganti
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Matthew Parker
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jing Ma
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Hartwell Center for Biotechnology and Bioinformatics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Ina Radtke
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Li Ding
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Washington University School of Medicine, Siteman Cancer Center, St. Louis, MO, USA, The Genome Institute at Washington University, St Louis, MO, USA
| | - Giovanni Cazzaniga
- Centro Ricerca Tettamanti, Pediatric Clinic, Univ. Milan Bicocca, Monza, Italy
| | - Andrea Biondi
- Pediatric Unit, University of Milan-Bicocca, San Gerardo Hospital, Monza, Italy
| | - Steven M. Kornblau
- Department of Blood and Marrow Transplantation, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Farhad Ravandi
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Hagop Kantarjian
- Department of Leukemia, University of Texas M. D. Anderson Cancer Center, Houston, TX, USA
| | - Stephen D. Nimer
- Molecular Pharmacology and Chemistry Program, Sloan Kettering Institute , New York, NY, USA
| | - Konstanze Döhner
- Department of Internal Medicine III, University of Ulm, Ulm, Germany
| | - Hartmut Döhner
- Department of Internal Medicine III, University of Ulm, Ulm, Germany
| | - Timothy J. Ley
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Washington University School of Medicine, Siteman Cancer Center, St. Louis, MO, USA, The Genome Institute at Washington University, St Louis, MO, USA
| | - Paola Ballerini
- Laboratoire d'Hématologie, Hôpital A. Trousseau, Paris, France
| | - Sheila Shurtleff
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Daisuke Tomizawa
- Department of Pediatrics, Tokyo Medical and Dental University, Tokyo, Japan
| | - Souichi Adachi
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yasuhide Hayashi
- Department of Haematology/Oncology, Gunma Children's Medical Center, Shibukawa, Japan
| | - Akio Tawa
- Dept. of Pediatrics, National Hospital Organization Osaka National Hospital, Osaka, Japan
| | - Lee-Yung Shih
- Division of Hematology-Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital, Chang Gung University, Taipei, Taiwan
| | - Der-Cherng Liang
- Division of Pediatric Hematology Oncology, Mackay Memorial Hospital, Taipei Taiwan
| | - Jeffrey E. Rubnitz
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Ching-Hon Pui
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Elaine R Mardis
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Washington University School of Medicine, Siteman Cancer Center, St. Louis, MO, USA, The Genome Institute at Washington University, St Louis, MO, USA
| | - Richard K Wilson
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Washington University School of Medicine, Siteman Cancer Center, St. Louis, MO, USA, The Genome Institute at Washington University, St Louis, MO, USA
| | - James R. Downing
- St. Jude Children's Research Hospital – Washington University Pediatric Cancer Genome Project, Memphis, TN, USA and St. Louis, MO, USA
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA
| |
Collapse
|
25
|
Neuwirtova R, Fuchs O, Holicka M, Vostry M, Kostecka A, Hajkova H, Jonasova A, Cermak J, Cmejla R, Pospisilova D, Belickova M, Siskova M, Hochova I, Vondrakova J, Sponerova D, Kadlckova E, Novakova L, Brezinova J, Michalova K. Transcription factors Fli1 and EKLF in the differentiation of megakaryocytic and erythroid progenitor in 5q- syndrome and in Diamond-Blackfan anemia. Ann Hematol 2012; 92:11-8. [PMID: 22965552 DOI: 10.1007/s00277-012-1568-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 08/29/2012] [Indexed: 11/29/2022]
Abstract
Friend leukemia virus integration 1 (Fli1) and erythroid Krüppel-like factor (EKLF) participate under experimental conditions in the differentiation of megakaryocytic and erythroid progenitor in cooperation with other transcription factors, cytokines, cytokine receptors, and microRNAs. Defective erythropoiesis with refractory anemia and effective megakaryopoiesis with normal or increased platelet count is typical for 5q- syndrome. We decided to evaluate the roles of EKLF and Fli1 in the pathogenesis of this syndrome and of another ribosomopathy, Diamond-Blackfan anemia (DBA). Fli1 and EKLF mRNA levels were examined in mononuclear blood and bone marrow cells from patients with 5q- syndrome, low-risk MDS patients with normal chromosome 5, DBA patients, and healthy controls. In 5q- syndrome, high Fli1 mRNA levels in the blood and bone marrow mononuclear cells were found. In DBA, Fli1 expression did not differ from the controls. EKLF mRNA level was significantly decreased in the blood and bone marrow of 5q- syndrome and in all DBA patients. We propose that the elevated Fli1 in 5q- syndrome protects megakaryocytic cells from ribosomal stress contrary to erythroid cells and contributes to effective though dysplastic megakaryopoiesis.
Collapse
Affiliation(s)
- Radana Neuwirtova
- 1st Department of Medicine, Department of Hematology, General University Hospital, U Nemocnice 2, Prague 2, 128 00, Czech Republic.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Chagraoui H, Porcher C. Establishment of an ES cell-derived murine megakaryocytic cell line, MKD1, with features of primary megakaryocyte progenitors. PLoS One 2012; 7:e32981. [PMID: 22396803 PMCID: PMC3292579 DOI: 10.1371/journal.pone.0032981] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 02/06/2012] [Indexed: 12/22/2022] Open
Abstract
Because of the scarcity of megakaryocytes in hematopoietic tissues, studying megakaryopoiesis heavily relies on the availability of appropriate cellular models. Here, we report the establishment of a new mouse embryonic stem (ES) cell-derived megakaryocytic cell line, MKD1. The cells are factor-dependent, their cell surface immunophenotype and gene expression profile closely resemble that of primary megakaryocyte progenitors (MkPs) and they further differentiate along the megakaryocyte lineage upon valproic acid treatment. At a functional level, we show that ablation of SCL expression, a transcription factor critical for MkP maturation, leads to gene expression alterations similar to that observed in primary, Scl-excised MkPs. Moreover, the cell line is amenable to biochemical and transcriptional analyses, as we report for GpVI, a direct target of SCL. Thus, the MKD1 cell line offers a pertinent experimental model to study the cellular and molecular mechanisms underlying MkP biology and more broadly megakaryopoiesis.
Collapse
Affiliation(s)
- Hedia Chagraoui
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom.
| | | |
Collapse
|
27
|
Abnormal expression of FLI1 protein is an adverse prognostic factor in acute myeloid leukemia. Blood 2011; 118:5604-12. [PMID: 21917756 DOI: 10.1182/blood-2011-04-348052] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Friend leukemia virus integration 1 (FLI1), an Ets transcription factor family member, is linked to acute myelogenous leukemia (AML) by chromosomal events at the FLI1 locus, but the biologic impact of FLI1 expression on AML is unknown. FLI1 protein expression was measured in 511 newly diagnosed AML patients. Expression was similar in peripheral blood (PB) and BM and higher at diagnosis than at relapse (P = .02). Compared with normal CD34(+) cells, expression in AML was above or below normal in 32% and 5% of patients, respectively. Levels were negatively correlated with an antecedent hematologic disorder (P = .002) but not with age or cytogenetics. Mutated NPM1 (P = .0007) or FLT3-ITD (P < .02) had higher expression. FLI1 levels were negatively correlated with 10 of 195 proteins associated with proliferation and stromal interaction, and positively correlated (R > 0.3) with 19 others. The FLI1 level was not predictive of remission attainment, but patients with low or high FLI1 expression had shorter remission duration (22.6 and 40.3 vs 51.1 weeks, respectively; P = .01) and overall survival (45.2 and 35.4 vs 59.4 weeks, respectively; P = .03). High FLI1 levels were adverse in univariate and multivariate analysis. FLI1 expression is frequently abnormal and prognostically adverse in AML. FLI1 and/or its response genes may be therapeutically targetable to interfere with AML cell biology.
Collapse
|
28
|
Krumsiek J, Marr C, Schroeder T, Theis FJ. Hierarchical differentiation of myeloid progenitors is encoded in the transcription factor network. PLoS One 2011; 6:e22649. [PMID: 21853041 PMCID: PMC3154193 DOI: 10.1371/journal.pone.0022649] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Accepted: 06/27/2011] [Indexed: 11/29/2022] Open
Abstract
Hematopoiesis is an ideal model system for stem cell biology with advanced experimental access. A systems view on the interactions of core transcription factors is important for understanding differentiation mechanisms and dynamics. In this manuscript, we construct a Boolean network to model myeloid differentiation, specifically from common myeloid progenitors to megakaryocytes, erythrocytes, granulocytes and monocytes. By interpreting the hematopoietic literature and translating experimental evidence into Boolean rules, we implement binary dynamics on the resulting 11-factor regulatory network. Our network contains interesting functional modules and a concatenation of mutual antagonistic pairs. The state space of our model is a hierarchical, acyclic graph, typifying the principles of myeloid differentiation. We observe excellent agreement between the steady states of our model and microarray expression profiles of two different studies. Moreover, perturbations of the network topology correctly reproduce reported knockout phenotypes in silico. We predict previously uncharacterized regulatory interactions and alterations of the differentiation process, and line out reprogramming strategies.
Collapse
Affiliation(s)
- Jan Krumsiek
- Institute of Bioinformatics and Systems Biology, Helmholtz Zentrum München, München, Germany
| | - Carsten Marr
- Institute of Bioinformatics and Systems Biology, Helmholtz Zentrum München, München, Germany
| | - Timm Schroeder
- Institute of Stem Cell Research, Helmholtz Zentrum München, München, Germany
| | - Fabian J. Theis
- Institute of Bioinformatics and Systems Biology, Helmholtz Zentrum München, München, Germany
- Department of Mathematics, Technische Universität München, München, Germany
- * E-mail:
| |
Collapse
|
29
|
Mouse models of diseases of megakaryocyte and platelet homeostasis. Mamm Genome 2011; 22:449-65. [PMID: 21667128 DOI: 10.1007/s00335-011-9336-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Accepted: 05/16/2011] [Indexed: 01/19/2023]
Abstract
Platelets are the small anuclear blood cells that are the product of megakaryocytopoiesis, the process of hematopoietic stem cell commitment to megakaryocyte production and the differentiation and maturation of these cells for platelet release. Deregulation or disruption of megakaryocytopoiesis can result in platelet deficiencies, the thrombocytopenias, with attendant risk of hemorrhage or thrombocytosis, a pathological excess of platelet numbers. Mouse models, particularly those engineered to carry genetic alterations modeling mutations associated with human disease, have provided important insights into megakaryocytopoiesis and deregulation of this process in disease. This review focuses on mouse models of diseases of altered megakaryocyte and platelet number, illustrating the profound contribution of these models in validating suspected roles of disease-associated genetic alterations, promoting discovery of new links between genetic mutations and specific diseases, and providing unique tools for better understanding of disease pathophysiology and progression, as well as resources to define drug action or develop new therapeutic strategies.
Collapse
|
30
|
Abstract
The Krüppel-like factor (KLF) family of transcription factors regulates diverse biological processes that include proliferation, differentiation, growth, development, survival, and responses to external stress. Seventeen mammalian KLFs have been identified, and numerous studies have been published that describe their basic biology and contribution to human diseases. KLF proteins have received much attention because of their involvement in the development and homeostasis of numerous organ systems. KLFs are critical regulators of physiological systems that include the cardiovascular, digestive, respiratory, hematological, and immune systems and are involved in disorders such as obesity, cardiovascular disease, cancer, and inflammatory conditions. Furthermore, KLFs play an important role in reprogramming somatic cells into induced pluripotent stem (iPS) cells and maintaining the pluripotent state of embryonic stem cells. As research on KLF proteins progresses, additional KLF functions and associations with disease are likely to be discovered. Here, we review the current knowledge of KLF proteins and describe common attributes of their biochemical and physiological functions and their pathophysiological roles.
Collapse
Affiliation(s)
- Beth B McConnell
- Departments of Medicine and of Hematology and Medical Oncology, Emory University School of Medicine,Atlanta, Georgia 30322, USA
| | | |
Collapse
|
31
|
Thrombocytopenia in mice lacking the carboxy-terminal regulatory domain of the Ets transcription factor Fli1. Mol Cell Biol 2010; 30:5194-206. [PMID: 20823267 DOI: 10.1128/mcb.01112-09] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Targeted disruption of the Fli1 gene results in embryonic lethality. To dissect the roles of functional domains in Fli1, we recently generated mutant Fli1 mice that express a truncated Fli1 protein (Fli1(ΔCTA)) that lacks the carboxy-terminal regulatory (CTA) domain. Heterozygous Fli1(ΔCTA) mice are viable, while homozygous mice have reduced viability. Early postnatal lethality accounts for 30% survival of homozygotes to adulthood. The peripheral blood of these viable Fli1(ΔCTA)/Fli1(ΔCTA) homozygous mice has reduced platelet numbers. Platelet aggregation and activation were also impaired and bleeding times significantly prolonged in these mutant mice. Analysis of mRNA from total bone marrow and purified megakaryocytes from Fli1(ΔCTA)/Fli1(ΔCTA) mice revealed downregulation of genes associated with megakaroyctic development, including c-mpl, gpIIb, gpIV, gpIX, PF4, NF-E2, MafG, and Rab27B. While Fli1 and GATA-1 synergistically regulate the expression of multiple megakaryocytic genes, the level of GATA-1 present on a subset of these promoters is reduced in vivo in the Fli1(ΔCTA)/Fli1(ΔCTA) mice, providing a possible mechanism for the impared transcription observed. Collectively, these data showed for the first time a hemostatic defect associated with the loss of a specific functional domain of the transcription factor Fli1 and suggest previously unknown in vivo roles in megakaryocytic cell differentiation.
Collapse
|
32
|
Inducible Fli-1 gene deletion in adult mice modifies several myeloid lineage commitment decisions and accelerates proliferation arrest and terminal erythrocytic differentiation. Blood 2010; 116:4795-805. [PMID: 20733157 DOI: 10.1182/blood-2010-02-270405] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
This study investigated the role of the ETS transcription factor Fli-1 in adult myelopoiesis using new transgenic mice allowing inducible Fli-1 gene deletion. Fli-1 deletion in adult induced mild thrombocytopenia associated with a drastic decrease in large mature megakaryocytes number. Bone marrow bipotent megakaryocytic-erythrocytic progenitors (MEPs) increased by 50% without increase in erythrocytic and megakaryocytic common myeloid progenitor progeny, suggesting increased production from upstream stem cells. These MEPs were almost unable to generate pure colonies containing large mature megakaryocytes, but generated the same total number of colonies mainly identifiable as erythroid colonies containing a reduced number of more differentiated cells. Cytological and fluorescence-activated cell sorting analyses of MEP progeny in semisolid and liquid cultures confirmed the drastic decrease in large mature megakaryocytes but revealed a surprisingly modest (50%) reduction of CD41-positive cells indicating the persistence of a megakaryocytic commitment potential. Symmetrical increase and decrease of monocytic and granulocytic progenitors were also observed in the progeny of purified granulocytic-monocytic progenitors and common myeloid progenitors. In summary, this study indicates that Fli-1 controls several lineages commitment decisions at the stem cell, MEP, and granulocytic-monocytic progenitor levels, stimulates the proliferation of committed erythrocytic progenitors at the expense of their differentiation, and is a major regulator of late stages of megakaryocytic differentiation.
Collapse
|
33
|
Genome-wide identification of TAL1's functional targets: insights into its mechanisms of action in primary erythroid cells. Genome Res 2010; 20:1064-83. [PMID: 20566737 DOI: 10.1101/gr.104935.110] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Coordination of cellular processes through the establishment of tissue-specific gene expression programs is essential for lineage maturation. The basic helix-loop-helix hemopoietic transcriptional regulator TAL1 (formerly SCL) is required for terminal differentiation of red blood cells. To gain insight into TAL1 function and mechanisms of action in erythropoiesis, we performed ChIP-sequencing and gene expression analyses from primary fetal liver erythroid cells. We show that TAL1 coordinates expression of genes in most known red cell-specific processes. The majority of TAL1's genomic targets require direct DNA-binding activity. However, one-fifth of TAL1's target sequences, mainly among those showing high affinity for TAL1, can recruit the factor independently of its DNA binding activity. An unbiased DNA motif search of sequences bound by TAL1 identified CAGNTG as TAL1-preferred E-box motif in erythroid cells. Novel motifs were also characterized that may help distinguish activated from repressed genes and suggest a new mechanism by which TAL1 may be recruited to DNA. Finally, analysis of recruitment of GATA1, a protein partner of TAL1, to sequences occupied by TAL1 suggests that TAL1's binding is necessary prior or simultaneous to that of GATA1. This work provides the framework to study regulatory networks leading to erythroid terminal maturation and to model mechanisms of action of tissue-specific transcription factors.
Collapse
|
34
|
Asano Y, Stawski L, Hant F, Highland K, Silver R, Szalai G, Watson DK, Trojanowska M. Endothelial Fli1 deficiency impairs vascular homeostasis: a role in scleroderma vasculopathy. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 176:1983-98. [PMID: 20228226 DOI: 10.2353/ajpath.2010.090593] [Citation(s) in RCA: 159] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Systemic sclerosis or scleroderma (SSc) is a complex autoimmune connective tissue disease characterized by obliterative vasculopathy and tissue fibrosis. The molecular mechanisms underlying SSc vasculopathy are largely unknown. Friend leukemia integration factor 1 (Fli1), an important regulator of immune function and collagen fibrillogenesis, is expressed at reduced levels in endothelial cells in affected skin of patients with SSc. To develop a disease model and to investigate the function of Fli1 in the vasculature, we generated mice with a conditional deletion of Fli1 in endothelial cells (Fli1 CKO). Fli1 CKO mice showed a disorganized dermal vascular network with greatly compromised vessel integrity and markedly increased vessel permeability. We show that Fli1 regulates expression of genes involved in maintaining vascular homeostasis including VE-cadherin, platelet endothelial cell adhesion molecule 1, type IV collagen, matrix metalloproteinase 9, platelet-derived growth factor B, and S1P(1) receptor. Accordingly, Fli1 CKO mice are characterized by down-regulation of VE-cadherin and platelet endothelial cell adhesion molecule 1, impaired development of basement membrane, and a decreased presence of alpha-smooth muscle actin-positive cells in dermal microvessels. This phenotype is consistent with a role of Fli1 as a regulator of vessel maturation and stabilization. Importantly, vascular characteristics of Fli1 CKO mice are recapitulated by SSc microvasculature. Thus, persistently reduced levels of Fli1 in endothelial cells may play a critical role in the development of SSc vasculopathy.
Collapse
Affiliation(s)
- Yoshihide Asano
- Arthritis Center, Boston University Medical Center, Boston, MA 02118, USA
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Dual requirement for the ETS transcription factors Fli-1 and Erg in hematopoietic stem cells and the megakaryocyte lineage. Proc Natl Acad Sci U S A 2009; 106:13814-9. [PMID: 19666492 DOI: 10.1073/pnas.0906556106] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Fli-1 and Erg are closely related members of the Ets family of transcription factors. Both genes are translocated in human cancers, including Ewing's sarcoma, leukemia, and in the case of Erg, more than half of all prostate cancers. Although evidence from mice and humans suggests that Fli-1 is required for megakaryopoiesis, and that Erg is required for normal adult hematopoietic stem cell (HSC) regulation, their precise physiological roles remain to be defined. To elucidate the relationship between Fli-1 and Erg in hematopoiesis, we conducted an analysis of mice carrying mutations in both genes. Our results demonstrate that there is a profound genetic interaction between Fli-1 and Erg. Double heterozygotes displayed phenotypes more dramatic than single heterozygotes: severe thrombocytopenia, with a significant deficit in megakaryocyte numbers and evidence of megakaryocyte dysmorphogenesis, and loss of HSCs accompanied by a reduction in the number of committed hematopoietic progenitor cells. These results illustrate an indispensable requirement for both Fli-1 and Erg in normal HSC and megakaryocyte homeostasis, and suggest these transcription factors may coregulate common target genes.
Collapse
|
36
|
Two children with subtelomeric 11q deletions: a description and interpretation of their clinical presentations and molecular genetic findings. Clin Dysmorphol 2009; 18:98-102. [DOI: 10.1097/mcd.0b013e3283202a1f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
|
37
|
ETS2 and ERG promote megakaryopoiesis and synergize with alterations in GATA-1 to immortalize hematopoietic progenitor cells. Blood 2009; 113:3337-47. [PMID: 19168790 DOI: 10.1182/blood-2008-08-174813] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
ETS2 and ERG are transcription factors, encoded on human chromosome 21 (Hsa21), that have been implicated in human cancer. People with Down syndrome (DS), who are trisomic for Hsa21, are predisposed to acute megakaryoblastic leukemia (AMKL). DS-AMKL blasts harbor a mutation in GATA1, which leads to loss of full-length protein but expression of the GATA-1s isoform. To assess the consequences of ETS protein misexpression on megakaryopoiesis, we expressed ETS2, ERG, and the related protein FLI-1 in wild-type and Gata1 mutant murine fetal liver progenitors. These studies revealed that ETS2, ERG, and FLI-1 facilitated the expansion of megakaryocytes from wild-type, Gata1-knockdown, and Gata1s knockin progenitors, but none of the genes could overcome the differentiation block characteristic of the Gata1-knockdown megakaryocytes. Although overexpression of ETS proteins increased the proportion of CD41(+) cells generated from Gata1s-knockin progenitors, their expression led to a significant reduction in the more mature CD42 fraction. Serial replating assays revealed that overexpression of ERG or FLI-1 immortalized Gata1-knockdown and Gata1s knockin, but not wild-type, fetal liver progenitors. Immortalization was accompanied by activation of the JAK/STAT pathway, commonly seen in megakaryocytic malignancies. These findings provide evidence for synergy between alterations in GATA-1 and overexpression of ETS proteins in aberrant megakaryopoiesis.
Collapse
|
38
|
Abstract
Biosynthesis of fibrillar collagen in the skin is precisely regulated to maintain proper tissue homeostasis; however, the molecular mechanisms involved in this process remain largely unknown. Transcription factor Fli1 has been shown to repress collagen synthesis in cultured dermal fibroblasts. This study investigated the role of Fli1 in regulation of collagen biosynthesis in mice skin in vivo using mice with the homozygous deletion of the C-terminal transcriptional activation (CTA) domain of the Fli1 gene (Fli1(DeltaCTA/DeltaCTA)). Skin analyses of the Fli1 mutant mice revealed a significant upregulation of fibrillar collagen genes at mRNA level, as well as increased collagen content as measured by acetic acid extraction and hydroxyproline assays. In addition, collagen fibrils contained ultrastructural abnormalities including immature thin fibrils and very thick irregularly shaped fibrils, which correlated with the reduced levels of decorin, fibromodulin, and lumican. Fibroblasts cultured from the skin of Fli1(DeltaCTA/DeltaCTA) mice maintained elevated synthesis of collagen mRNA and protein. Additional experiments in cultured fibroblasts have revealed that although Fli1 DeltaCTA retains the ability to bind to the collagen promoter in vitro and in vivo, it no longer functions as transcriptional repressor. Together, these results establish Fli1 as a key regulator of the collagen homeostasis in the skin in vivo.
Collapse
|
39
|
Salati S, Zini R, Bianchi E, Testa A, Mavilio F, Manfredini R, Ferrari S. Role of CD34 antigen in myeloid differentiation of human hematopoietic progenitor cells. Stem Cells 2008; 26:950-9. [PMID: 18192237 DOI: 10.1634/stemcells.2007-0597] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
CD34 is a transmembrane protein that is strongly expressed on hematopoietic stem/progenitor cells (HSCs); despite its importance as a marker of HSCs, its function is still poorly understood, although a role in cell adhesion has been demonstrated. To characterize the function of CD34 antigen on human HSCs, we examined, by both inhibition and overexpression, the role of CD34 in the regulation of HSC lineage differentiation. Our results demonstrate that CD34 silencing enhances HSC granulocyte and megakaryocyte differentiation and reduces erythroid maturation. In agreement with these results, the gene expression profile of these cells reveals the upregulation of genes involved in granulocyte and megakaryocyte differentiation and the downregulation of erythroid genes. Consistently, retroviral-mediated CD34 overexpression leads to a remarkable increase in erythroid progenitors and a dramatic decrease in granulocyte progenitors, as evaluated by clonogenic assay. Together, these data indicate that the CD34 molecule promotes the differentiation of CD34+ hematopoietic progenitors toward the erythroid lineage, which is achieved, at least in part, at the expense of granulocyte and megakaryocyte lineages.
Collapse
Affiliation(s)
- Simona Salati
- Department of Biomedical Sciences, Biological Chemistry Section, University of Modena and Reggio Emilia, Via Campi 287, 41100 Modena, Italy
| | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
PURPOSE OF REVIEW The aim of this review is to explore the state of the art knowledge on the cell biological and molecular pathways that regulate megakaryopoiesis and lead to platelet production. RECENT FINDINGS In the last 2 years there has been considerable progress in the elucidation of molecular mechanisms of megakaryocyte development and platelet biogenesis, driven by the application of modern molecular biology approaches to these specialized and unique cells. Studies have for the first time visualized endomitotic spindle dynamics, characterized the maturation of the demarcation membrane system, and delineated the mechanics of organelle transport and microtubule assembly in living megakaryocytes. The role of specific molecules in platelet production has been elucidated in greater detail by combining molecular studies with genetically engineered mice as well as embryonic cell culture systems. SUMMARY This review integrates the latest studies of megakaryocyte development into the molecular pathways that regulate megakaryopoiesis and thrombopoiesis. Decoding the pathways of megakaryopoiesis and platelet production should help revolutionize the management of thrombocytopenia and other platelet disorders.
Collapse
|
41
|
Yamada H, Sekikawa T, Iwase S, Arakawa Y, Suzuki H, Agawa M, Akiyama M, Takeda N, Horiguchi-Yamada J. Segregation of megakaryocytic or erythroid cells from a megakaryocytic leukemia cell line (JAS-R) by adhesion during culture. Leuk Res 2007; 31:1537-43. [PMID: 17383723 DOI: 10.1016/j.leukres.2007.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Revised: 02/13/2007] [Accepted: 02/13/2007] [Indexed: 02/07/2023]
Abstract
Adhesion is one of the important biologic characteristics of leukemic cells. We previously reported a new megakaryocytic-erythroid cell line, JAS-R. In this study, JAS-R cells were segregated into two types by the differences of attachment to culture dishes. One type (designated as JAS-RAD cells) adhered to the substratum of the culture dishes, while the other (JAS-REN cells) grew as a single-cell suspension. Adhesion of JAS-RAD was inhibited by treatment with RGDS oligopeptide. Flow cytometric analysis revealed that JAS-RAD cells had high expression of CD41a and CD61 versus low CD235a expression, and JAS-REN showed low expression of CD41a, and CD61, and high CD235a. The two phenotypes were reciprocally exchangeable by selecting adherent or suspended cells from each type of culture. Microarray analysis and RT-PCR revealed that JAS-RAD cells expressed four major alpha-granule genes and JAS-REN cells expressed beta-globin. Interestingly, erythropoietin was only secreted by JAS-RAD cells. With regard to transcription factors, it was shown that GFI1, FLI1 and RUNX1 were strongly expressed in JAS-RAD cells while GATA1, FOG1 and NFE2 were equally expressed by both types. These findings indicate that adhesion via integrins is related to the phenotypic shift of JAS-R cells between megakaryocytic and erythroid lineages.
Collapse
Affiliation(s)
- Hisashi Yamada
- Department of Molecular Genetics, Institute of DNA Medicine, The Jikei University, School of Medicine, 3-25-8 Nishi-Shinbashi, Tokyo, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Frontelo P, Manwani D, Galdass M, Karsunky H, Lohmann F, Gallagher PG, Bieker JJ. Novel role for EKLF in megakaryocyte lineage commitment. Blood 2007; 110:3871-80. [PMID: 17715392 PMCID: PMC2190608 DOI: 10.1182/blood-2007-03-082065] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Megakaryocytes and erythroid cells are thought to derive from a common progenitor during hematopoietic differentiation. Although a number of transcriptional regulators are important for this process, they do not explain the bipotential result. We now show by gain- and loss-of-function studies that erythroid Krüppel-like factor (EKLF), a transcription factor whose role in erythroid gene regulation is well established, plays an unexpected directive role in the megakaryocyte lineage. EKLF inhibits the formation of megakaryocytes while at the same time stimulating erythroid differentiation. Quantitative examination of expression during hematopoiesis shows that, unlike genes whose presence is required for establishment of both lineages, EKLF is uniquely down-regulated in megakaryocytes after formation of the megakaryocyte-erythroid progenitor. Expression profiling and molecular analyses support these observations and suggest that megakaryocytic inhibition is achieved, at least in part, by EKLF repression of Fli-1 message levels.
Collapse
|
43
|
Buet D, Raslova H, Geay JF, Jarrier P, Lazar V, Turhan A, Morlé F, Vainchenker W, Louache F. p210(BCR-ABL) reprograms transformed and normal human megakaryocytic progenitor cells into erythroid cells and suppresses FLI-1 transcription. Leukemia 2007; 21:917-25. [PMID: 17315025 DOI: 10.1038/sj.leu.2404600] [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: 02/02/2023]
Abstract
The BCR-ABL oncoprotein exhibits deregulated protein tyrosine kinase activity and is implicated in the pathogenesis of Philadelphia chromosome (Ph)-positive human leukemias. Here, we report that ectopic expression of p210(BCR-ABL) in the megakaryoblastic Mo7e cell line and in primary human CD34(+) progenitors trigger erythroid differentiation at the expense of megakaryocyte (MK) differentiation. Clonal culture of purified CD41(+)CD42(-) cells, a population highly enriched in MK progenitors, combined with the conditional expression of p210(BCR-ABL) tyrosine kinase activity by imatinib identified a true lineage reprogramming. In both Mo7e or CD41(+)CD42(-) cells transduced with p210(BCR-ABL), lineage switching was associated with a downregulation of the friend leukemia Integration 1 (FLI-1) transcription factor. Re-expression of FLI-1 in p210(BCR-ABL)-transduced Mo7e cells rescued the megakaryoblastic phenotype. Altogether, these results demonstrate that alteration of signal transduction via p210(BCR-ABL) reprograms MK cells into erythroid cells by a downregulation of FLI-1. In addition, our findings underscore the role of kinases in lineage choice and infidelity in pathology and suggest that downregulation of FLI-1 may have important implications in CML pathogenesis.
Collapse
Affiliation(s)
- D Buet
- INSERM, U790, Institut Gustave Roussy, Villejuif, France
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
|
45
|
Pang L, Xue HH, Szalai G, Wang X, Wang Y, Watson DK, Leonard WJ, Blobel GA, Poncz M. Maturation stage-specific regulation of megakaryopoiesis by pointed-domain Ets proteins. Blood 2006; 108:2198-206. [PMID: 16757682 PMCID: PMC1895561 DOI: 10.1182/blood-2006-04-019760] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2006] [Accepted: 05/22/2006] [Indexed: 12/31/2022] Open
Abstract
Numerous megakaryocyte-specific genes contain signature Ets-binding sites in their regulatory regions. Fli-1 (friend leukemia integration 1), an Ets transcription factor, is required for the normal maturation of megakaryocytes and controls the expression of multiple megakaryocyte-specific genes. However, in Fli-1-/- mice, early megakaryopoiesis persists, and the expression of the early megakaryocyte-specific genes, alphaIIb and cMpl, is maintained, consistent with functional compensation by a related Ets factor(s). Here we identify the Ets protein GABPalpha (GA-binding protein alpha) as a regulator of early megakaryocyte-specific genes. Notably, GABPalpha preferentially occupies Ets elements of early megakaryocyte-specific genes in vitro and in vivo, whereas Fli-1 binds both early and late megakaryocyte-specific genes. Moreover, the ratio of GABPalpha/Fli-1 expression declines throughout megakaryocyte maturation. Consistent with this expression pattern, primary fetal liver-derived megakaryocytes from Fli-1-deficient murine embryos exhibit reduced expression of genes associated with late stages of maturation (glycoprotein [GP] Ibalpha, GPIX, and platelet factor 4 [PF4]), whereas GABPalpha-deficient megakaryocytes were mostly impaired in the expression of early megakaryocyte-specific genes (alphaIIb and cMpl). Finally, mechanistic experiments revealed that GABPalpha, like Fli-1, can impart transcriptional synergy between the hematopoietic transcription factor GATA-1 and its cofactor FOG-1 (friend of GATA-1). In concert, these data reveal disparate, but overlapping, functions of Ets transcription factors at distinct stages of megakaryocyte maturation.
Collapse
Affiliation(s)
- Liyan Pang
- Children's Hospital of Philadelphia, ARC 316H, 3165 Civic Center Blvd, Philadelphia, PA, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
46
|
|
47
|
Geddis AE. Inherited Thrombocytopenia: Congenital Amegakaryocytic Thrombocytopenia and Thrombocytopenia With Absent Radii. Semin Hematol 2006; 43:196-203. [PMID: 16822462 DOI: 10.1053/j.seminhematol.2006.04.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Thrombocytopenia in the newborn period can signify an inherited platelet disorder. Congenital amegakaryocytic thrombocytopenia (CAMT) and thrombocytopenia with absent radii (TAR) share features of isolated thrombocytopenia, reduced or absent marrow megakaryocytes, impaired responsiveness to thrombopoietin (TPO), and high plasma TPO levels. These disorders are most readily distinguished from each other by the finding of radial aplasia in TAR and the presence of c-MPL mutations in CAMT. In addition, their long-term outcomes are strikingly different: the development of trilineage marrow failure in CAMT in contrast to the general improvement of thrombocytopenia in TAR. The differential diagnosis for CAMT and TAR also includes other congenital disorders in which thrombocytopenia and radial abnormalities can be seen. In this article we will review our molecular and clinical understanding of these two inherited disorders of amegakaryocytosis.
Collapse
Affiliation(s)
- Amy E Geddis
- Department of Pediatrics, Division of Pediatric Hematology-Oncology, University of California San Diego, La Jolla, CA, USA.
| |
Collapse
|
48
|
Abstract
Ewing's sarcoma and related tumors (ESFT) are characterized by rearrangements of EWS with ets family genes. While detection of these gene fusions greatly facilitated diagnosis, it has not provided any clues about the tissue of origin. Immunological and gene expression profiling studies favour a neuroectodermal histogenesis. These investigations did not appreciate the impact of EWS-ets proteins on the tumor phenotype. Introduction of EWS-ets into different cellular models resulted in diverse outcomes ranging from the induction of cell cycle arrest or apoptosis to transformation and tumorigenicity, and from blocked differentiation to trans-differentiation. Thus, the molecular signature of EWS-ets proteins depends on the cell type. The hen or egg problem in ESFT, therefore, is whether ESFT reflect the phenotype of the tumor stem cell that is blocked in differentiation by the activity of the EWS-ets gene fusion or if the oncogene imposes an incomplete differentiation program on a pluripotent precursor cell. This article addresses the problem by considering the tissue distribution of FLI1 and ERG expression and by reviewing evidence for combinatorial control of EWS-ets activity.
Collapse
Affiliation(s)
- Heinrich Kovar
- Children's Cancer Research Institute, St. Anna Kinderspital, Kinderspitalgasse 6, A-1090 Vienna, Austria.
| |
Collapse
|
49
|
Abstract
Platelets, derived from megakaryocytes, have an essential role in thrombosis and hemostasis. Over the past 10 years, a great deal of new information has been obtained concerning the various aspects of hematopoiesis necessary to maintain a steady-state platelet level to support physiologic hemostasis. Here we discuss the differentiation of HSCs into megakaryocytes, with emphasis on the key cytokine signaling pathways and hematopoietic transcription factors. Recent insight into these processes elucidates the molecular bases of numerous acquired and inherited hematologic disorders. It is anticipated that the growing knowledge in these areas may be exploited for new therapeutic strategies to modulate both platelet numbers and their thrombogenicity.
Collapse
Affiliation(s)
- Liyan Pang
- Division of Hematology, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Pennsylvania 19104, USA.
| | | | | |
Collapse
|
50
|
van den Akker E, Ano S, Shih HM, Wang LC, Pironin M, Palvimo JJ, Kotaja N, Kirsh O, Dejean A, Ghysdael J. FLI-1 functionally interacts with PIASxalpha, a member of the PIAS E3 SUMO ligase family. J Biol Chem 2005; 280:38035-46. [PMID: 16148010 DOI: 10.1074/jbc.m502938200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
FLI-1 is a transcription factor of the ETS family that is involved in several developmental processes and that becomes oncogenic when overexpressed or mutated. As the functional regulators of FLI-1 are largely unknown, we performed a yeast two-hybrid screen with FLI-1 and identified the SUMO E3 ligase PIASxalpha/ARIP3 as a novel in vitro and in vivo binding partner of FLI-1. This interaction involved the ETS domain of FLI-1 and required the integrity of the SAP domain of PIASxalpha/ARIP3. SUMO-1 and Ubc9, the ubiquitin carrier protein component in the sumoylation pathway, were also identified as interactors of FLI-1. Both PIASxalpha/ARIP3 and the closely related PIASxbeta isoform specifically enhanced sumoylation of FLI-1 at Lys(67), located in its N-terminal activation domain. PIASxalpha/ARIP3 relocalized the normally nuclear but diffusely distributed FLI-1 protein to PIASxalpha nuclear bodies and repressed FLI-1 transcriptional activation as assessed using different ETS-binding site-dependent promoters and different cell systems. PIASxalpha repressive activity was independent of sumoylation and did not result from inhibition of FLI-1 DNA-binding activity. Analysis of the properties of a series of ARIP3 mutants showed that the repressive properties of PIASxalpha/ARIP3 require its physical interaction with FLI-1, identifying PIASxalpha as a novel corepressor of FLI-1.
Collapse
|