HOX Genes in Pathogenesis of Ewing Sarcoma
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Fakultät für Medizin HOX genes in pathogenesis of Ewing sarcoma Miriam Verena Manuela Ertl Vollständiger Abdruck der von der Fakultät für Medizin der Technischen Universität München zur Erlangung des akademischen Grades eines Doktors der Medizin genehmigten Dissertation. Vorsitzender: Prof. Dr. Ernst J. Rummeny Prüfer der Dissertation: 1. Prof. Dr. Stephanie Elisabeth Combs 2. Prof. Dr. Stefan Burdach Die Dissertation wurde am 25.09.2017 bei der Technischen Universität München eingereicht und durch die Fakultät für Medizin am 02.05.2018 angenommen. meiner Mutter TABLE OF CONTENTS Table of contents List of abbreviations ......................................................................................................... III 1 Introduction ...................................................................................... 1 1.1 HOX genes......................................................................................................... 1 1.2 Skeletogenesis and bone formation ............................................................... 15 1.3 Bone morphogenetic proteins and the TGF β pathway ................................. 19 1.4 Ewing sarcoma ................................................................................................ 22 1.5 Aim of this study and experimental approach ............................................... 28 2 Materials and methods ....................................................................29 2.1 Materials ......................................................................................................... 29 2.2 Methods.......................................................................................................... 43 3 Results .............................................................................................63 3.1 Posterior HOXD genes are overexpressed in Ewing sarcoma ........................ 63 3.2 HOX gene expression is not regulated by the two “main suspects” .............. 67 3.3 HOX gene expression is downregulated by siRNA interference .................... 71 3.4 HOX gene expression is downregulated by retroviral gene transfer ............. 74 3.5 Microarray analysis reveals possible downstream HOX targets .................... 75 3.6 HOX genes seem to intervene in BMP signaling in ES cells ............................ 80 3.7 HOX genes don’t influence endothelial cell tube formation .......................... 83 3.8 HOX genes promote proliferation of Ewing sarcoma cells ............................ 84 3.9 HOX knockdown inhibits anchorage-independent growth of ES cells ........... 86 3.10 HOX genes promote chondrogenic differentiation in Ewing sarcoma cells ... 87 3.11 Ewing sarcoma cells are capable of osteogenic differentiation ..................... 90 4 Discussion ........................................................................................95 4.1 Overexpression of HOXD10, HOXD11 and HOXD13 in Ewing sarcoma ......... 95 4.2 HOX gene expression is not regulated by EZH2 in Ewing sarcoma .............. 100 4.3 HOX gene expression is not regulated by EWS-FLI1 .................................... 102 4.4 Microarray analysis reveals few but critical downstream targets ............... 105 I 4.5 HOX knockdown impairs proliferation and anchorage-independent growth of Ewing sarcoma cells ..................................................................... 112 4.6 HOX genes control genes related to BMP signaling and are critical for chondrogenic differentiation of Ewing sarcoma cells .................................. 115 4.7 Assumed role of HOX genes in pathogenesis of Ewing sarcoma ................. 126 4.8 Clinical implications and future perspectives............................................... 126 5 Summary ...................................................................................... 129 6 Zusammenfassung ........................................................................ 131 7 References .................................................................................... 133 8 Publication .................................................................................... 161 9 Appendices ................................................................................... 163 9.1 List of figures ................................................................................................ 163 9.2 List of tables .................................................................................................. 164 9.3 Amino acids and their codes ........................................................................ 165 10 Acknowledgements ....................................................................... 167 II LIST OF ABBREVIATIONS List of abbreviations Abd-A Abdominal A; component of Bithorax complex Abd-B Abdominal B; component of Bithorax complex ACTB β-actin AGC1 Aggrecan 1 ALL Acute lymphoid leukemia ALP Alkalic phosphatase ALPL Alkalic phosphatase AMH Anti-Muellerian hormone AML Acute myeloid leukemia Antp Antennapedia; component of Antennapedia complex Arg Arginine Asn Asparagine α thalassamia/mental retardation syndrome x-linked; also known as ATRX XNP B3GAT1 β-1,3-glucuronyltransferase 1; also known as CD57, LEU7 and HNK1 BAMBI BMP and activin membrane bound inhibitor BCP 1-bromo-3-chloropropane BGLAP Bone γ-carboxyglutamate protein; also known as osteocalcin BHA Butylated hydroxyanisole BMI1 proto-oncogene, polycomb ring finger protein; also known as BMI1 PCGF4; component of PRC1 BMP Bone morphogenetic protein BMP2 Bone morphogenetic protein 2 BMP4 Bone morphogenetic protein 4 BMP7 Bone morphogenetic protein 7 BMPs Bone morphogenetic proteins bp Base pair BSA Bovine serum albumine BSP Bone sialoprotein CBFα1 Core binding factor α1; also known as RUNX2 CBX Component of PRC1 CCD Cleidocranial dysplasia CD49 Certain cell surface glycoprotein; lymphoid marker CD57 β-1,3-glucuronyltransferase 1; also known as B3GAT1, LEU7 and HNK1 III CD99 Certain cell surface glycoprotein; also known as MIC2 cDNA Complementary DNA CHM1 Chondromodulin 1 CNS Central nervous system COL10A1 Collagen type X alpha 1 COL1A1 Collagen type I alpha 1 COL2A1 Collagen type II alpha 1 Certain DNA region where cytosine and guanine are separated by only CpG site one phosphate CT Computed tomography CTEV Congenital talipes equinovarus DEPC Diethylpyrocarbonate Dfd Deformed; component of Antennapedia complex DKK2 Dickkopf 2 DMSO Dimethyl sulfoxide DNA Deoxyribonucleic acid dNTPs Deoxynucleotides; nucleoside triphosphates DPBS Dulbecco’s phosphate-buffered saline ds Double strand ECM Extracellular matrix EDTA Ethylenediaminetetraacetic acid EED Embryonic ectoderm development EEF1D Eukaryotic translation elongation factor 1 delta EFT Ewing family of tumors EGF Epidermal growth factor Engelbreth-Holm-Swarm; name of a mouse tumor with abundant EHS extracellular matrix ENT Ear, nose and throat ETS-related gene; full name: v-ets avian erythroblastosis virus E26 ERG oncogene homolog ERK Extracellular signal-regulated kinase ES Ewing sarcoma ETS E26 family of transcription factors ETS E26 transformation-specific gene; encodes transcription factor ETV1 ETS variant 1 ETV4 ETS variant 4, also called E1AF IV LIST OF ABBREVIATIONS EWS Ewing sarcoma gene EWS-FLI1 Fusion protein which characterizes Ewing sarcomas EWSR1 Ewing sarcoma breakpoint region 1 EWSR2 Ewing sarcoma breakpoint region 2 EZH1 Enhancer of zeste homolog 1; polycomb repressive complex 2 subunit EZH2 Enhancer of zeste homolog 2; polycomb repressive complex 2 subunit FAM™ 6-carboxyfluorescein FDG-PET fluorine-18 fluorodeoxyglucose positron emission tomography FEV Gene in fifth Ewing sarcoma variant FGF Fibroblast growth factor FISH Fluorescence in situ hybridization FLI1 Friend leukemia virus integration site 1 GDF Growth differentiation factor gDNA Genomic DNA GPR64 G protein-coupled receptor 64 GTP Guanosine triphosphate HAUS6 HAUS augmin-like complex, subunit 6 HCl Hydrogen chloride HNK1 β-1,3-glucuronyltransferase 1; also known as B3GAT1, LEU7 and CD57 HOTAIR Acronym of a certain RNA called HOX Antisense Intergenic RNA HOX genes Homeotic genes HOXA13 Homeobox A13 HOXD10 Homeobox D10 HOXD11 Homeobox D11 HOXD13 Homeobox D13 HPH Component of PRC1 IBSP Integrin binding sialoprotein; also known as BSP IGF Insulin-like growth factor IGFBP3 Insulin-like growth factor binding protein 3 IHH Indian hedgehog I-SMAD Inhibitory SMAD JNK c-Jun NH2-terminal kinase kb Kilobase Lab Labial; component of Antennapedia complex LEU7 β-1,3-glucuronyltransferase 1; also known as B3GAT1, HNK1 and CD57 V MAP2K MAPK kinase MAP3K MAPK kinase kinase MAPK Mitogen-activated protein kinase MDS Myelodysplastic syndrome MEIS Family of proteins; group of homeobox genes MGB Minor groove binder; name of a certain quencher MIC2 Certain cell surface glycoprotein which is also known as CD99 min Minutes miR MicroRNA miR-10b MicroRNA 10b miR-224 MicroRNA 224 miR-23a MicroRNA 23a miR-7 MicroRNA 7 miRNA MicroRNA MMP Matrix metalloproteinase MMP13 Matrix metallopeptidase 13 MRI Magnetic resonance imaging mRNA Messenger RNA MSC Mesenchymal stem cell n.d. Not detectable n.s. Not significant NHL Non-Hodgkin lymphoma NMR Nuclear magnetic resonance NSE Neuron-specific enolase NTC Non-template control ON Osteonectin OP1 Also known as BMP7 OSX Also known as SP7 PAK1 p21-activated kinase 1 Pb Proboscipedia; component of Antennapedia complex PBS Phosphate-buffered saline PBX PBX homeobox protein PcG Polycomb-group PCGF Certain polycomb group protein; component of PRC1 PCGF4 Also known as BMI1; polycomb ring finger protein; component