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Leclerc K, Remark LH, Ramsukh M, Josephson AM, Palma L, Parente PEL, Sambon M, Lee S, Lopez EM, Morgani SM, Leucht P. Hox genes are crucial regulators of periosteal stem cell identity. Development 2023; 150:dev201391. [PMID: 36912250 PMCID: PMC10112919 DOI: 10.1242/dev.201391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 02/20/2023] [Indexed: 03/14/2023]
Abstract
Periosteal stem and progenitor cells (PSPCs) are major contributors to bone maintenance and repair. Deciphering the molecular mechanisms that regulate their function is crucial for the successful generation and application of future therapeutics. Here, we pinpoint Hox transcription factors as necessary and sufficient for periosteal stem cell function. Hox genes are transcriptionally enriched in periosteal stem cells and their overexpression in more committed progenitors drives reprogramming to a naïve, self-renewing stem cell-like state. Crucially, individual Hox family members are expressed in a location-specific manner and their stem cell-promoting activity is only observed when the Hox gene is matched to the anatomical origin of the PSPC, demonstrating a role for the embryonic Hox code in adult stem cells. Finally, we demonstrate that Hoxa10 overexpression partially restores the age-related decline in fracture repair. Together, our data highlight the importance of Hox genes as key regulators of PSPC identity in skeletal homeostasis and repair.
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Affiliation(s)
- Kevin Leclerc
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Lindsey H. Remark
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
- Department of Cell Biology, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Malissa Ramsukh
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Anne Marie Josephson
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
- Department of Cell Biology, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Laura Palma
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Paulo E. L. Parente
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Margaux Sambon
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Sooyeon Lee
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
- Institute of Comparative Molecular Endocrinology, Ulm University, Ulm 89081, Germany
| | - Emma Muiños Lopez
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
- Cell Therapy Area, Clínica Universidad de Navarra, Pamplona 31008, Spain
| | - Sophie M. Morgani
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
| | - Philipp Leucht
- Department of Orthopedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
- Department of Cell Biology, NYU Robert I. Grossman School of Medicine, New York, NY 10016, USA
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Muranyi A, Ammer T, Kechter A, Rawat VP, Sinha A, Gonzalez-Menendez I, Quintanilla-Martinez L, Azoitei A, Günes C, Mupo A, Vassiliou G, Bamezai S, Buske C. Npm1 haploinsufficiency in collaboration with MEIS1 is sufficient to induce AML in mice. Blood Adv 2023; 7:351-364. [PMID: 35468619 PMCID: PMC9898611 DOI: 10.1182/bloodadvances.2022007015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 03/18/2022] [Accepted: 04/07/2022] [Indexed: 02/01/2023] Open
Abstract
NPM1 is among the most frequently mutated genes in acute myeloid leukemia (AML). Mutations in the NPM1 gene result in the increased export of NPM1 to the cytoplasm (NPM1c) and are associated with multiple transforming events including the aberrant upregulation of MEIS1 that maintains stem cell and cell cycle-associated pathways in NPM1c AML. However, another consequence of the NPM1c mutation is the inadequate levels of NPM1 wild-type in the nucleus and nucleolus, caused by the loss of one wild-type allele in addition to enforced NPM1 nuclear export. The contribution of NPM1 haploinsufficiency independently of the NPM1 mutation to AML development and its relationship with MEIS1 function is poorly understood. Using mouse models, our study shows that NPM1 haploinsufficiency paired with MEIS1 overexpression is sufficient to induce a fully penetrant AML in mice that transcriptionally resembles human NPM1c AML. NPM1 haploinsufficiency alters MEIS1-binding occupancies such that it binds the promoter of the oncogene structural maintenance of chromosome protein 4 (SMC4) in NPM1 haploinsufficient AML cells but not in NPM1 wild-type-harboring Hoxa9/Meis1-transformed cells. SMC4 is higher expressed in haploinsufficient and NPM1c+ AML cells, which are more vulnerable to the disruption of the MEIS1-SMC4 axis compared with AML cells with nonmutated NPM1. Taken together, our study underlines that NPM1 haploinsufficiency on its own is a key factor of myeloid leukemogenesis and characterizes the MEIS1-SMC4 axis as a potential therapeutic target in this AML subtype.
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Affiliation(s)
- Andrew Muranyi
- Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany
| | - Tobias Ammer
- Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany
| | - Anna Kechter
- Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany
| | - Vijay P.S. Rawat
- Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India
| | | | - Irene Gonzalez-Menendez
- Institute of Pathology and Neuropathology, Comprehensive Cancer Center, Eberhard Karls University, Tübingen, Germany
- Cluster of Excellence, Image-Guided and Functionally Instructed Tumor Therapies (iFIT) (EXC 2180), Eberhard Karls University, Tübingen, Germany
| | - Leticia Quintanilla-Martinez
- Institute of Pathology and Neuropathology, Comprehensive Cancer Center, Eberhard Karls University, Tübingen, Germany
- Cluster of Excellence, Image-Guided and Functionally Instructed Tumor Therapies (iFIT) (EXC 2180), Eberhard Karls University, Tübingen, Germany
| | - Anca Azoitei
- Department of Urology, Ulm University, Ulm, Germany
| | | | - Annalisa Mupo
- Department of Hematology, University of Cambridge, Cambridge, United Kingdom
| | - George Vassiliou
- Department of Hematology, University of Cambridge, Cambridge, United Kingdom
| | - Shiva Bamezai
- Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany
| | - Christian Buske
- Institute of Experimental Cancer Research, University Hospital of Ulm, Ulm, Germany
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Savage AM, Alberio R, Johnson AD. Germline competent mesoderm: the substrate for vertebrate germline and somatic stem cells? Biol Open 2021; 10:272478. [PMID: 34648017 PMCID: PMC8524722 DOI: 10.1242/bio.058890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
In vitro production of tissue-specific stem cells [e.g. haematopoietic stem cells (HSCs)] is a key goal of regenerative medicine. However, recent efforts to produce fully functional tissue-specific stem cells have fallen short. One possible cause of shortcomings may be that model organisms used to characterize basic vertebrate embryology (Xenopus, zebrafish, chick) may employ molecular mechanisms for stem cell specification that are not conserved in humans, a prominent example being the specification of primordial germ cells (PGCs). Germ plasm irreversibly specifies PGCs in many models; however, it is not conserved in humans, which produce PGCs from tissue termed germline-competent mesoderm (GLCM). GLCM is not conserved in organisms containing germ plasm, or even in mice, but understanding its developmental potential could unlock successful production of other stem cell types. GLCM was first discovered in embryos from the axolotl and its conservation has since been demonstrated in pigs, which develop from a flat-disc embryo like humans. Together these findings suggest that GLCM is a conserved basal trait of vertebrate embryos. Moreover, the immortal nature of germ cells suggests that immortality is retained during GLCM specification; here we suggest that the demonstrated pluripotency of GLCM accounts for retention of immortality in somatic stem cell types as well. This article has an associated Future Leaders to Watch interview with the author of the paper. Summary: Recent findings that germline and stem cell specification may differ between species may have important implications for regenerative medicine and the future of stem cell biology.
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Affiliation(s)
- Aaron M Savage
- School of Pharmacy, Division of Stem Cell and Regenerative Medicine, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Ramiro Alberio
- School of Biosciences, Stem Cell Biology, Reprogramming and Pluripotency, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - Andrew D Johnson
- School of Life Sciences, Division of Cells, Organisms and Molecular Genetics, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK
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Role of the HOXA cluster in HSC emergence and blood cancer. Biochem Soc Trans 2021; 49:1817-1827. [PMID: 34374409 DOI: 10.1042/bst20210234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/21/2021] [Accepted: 07/23/2021] [Indexed: 12/24/2022]
Abstract
Hematopoiesis, the process of blood formation, is controlled by a complex developmental program that involves intrinsic and extrinsic regulators. Blood formation is critical to normal embryonic development and during embryogenesis distinct waves of hematopoiesis have been defined that represent the emergence of hematopoietic stem or progenitor cells. The Class I family of homeobox (HOX) genes are also critical for normal embryonic development, whereby mutations are associated with malformations and deformity. Recently, members of the HOXA cluster (comprising 11 genes and non-coding RNA elements) have been associated with the emergence and maintenance of long-term repopulating HSCs. Previous studies identified a gradient of HOXA expression from high in HSCs to low in circulating peripheral cells, indicating their importance in maintaining blood cell numbers and differentiation state. Indeed, dysregulation of HOXA genes either directly or by genetic lesions of upstream regulators correlates with a malignant phenotype. This review discusses the role of the HOXA cluster in both HSC emergence and blood cancer formation highlighting the need for further research to identify specific roles of these master regulators in normal and malignant hematopoiesis.
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The stem cell-specific long noncoding RNA HOXA10-AS in the pathogenesis of KMT2A-rearranged leukemia. Blood Adv 2020; 3:4252-4263. [PMID: 31867596 DOI: 10.1182/bloodadvances.2019032029] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 11/18/2019] [Indexed: 01/10/2023] Open
Abstract
HOX genes are highly conserved, and their precisely controlled expression is crucial for normal hematopoiesis. Accordingly, deregulation of HOX genes can cause leukemia. However, despite of intensive research on the coding HOX genes, the role of the numerous long noncoding RNAs (lncRNAs) within the HOX clusters during hematopoiesis and their contribution to leukemogenesis are incompletely understood. Here, we show that the lncRNA HOXA10-AS, located antisense to HOXA10 and mir-196b in the HOXA cluster, is highly expressed in hematopoietic stem cells (HSCs) as well as in KMT2A-rearranged and NPM1 mutated acute myeloid leukemias (AMLs). Using short hairpin RNA- and locked nucleic acid-conjugated chimeric antisense oligonucleotide (LNA-GapmeR)-mediated HOXA10-AS-knockdown and CRISPR/Cas9-mediated excision in vitro, we demonstrate that HOXA10-AS acts as an oncogene in KMT2A-rearranged AML. Moreover, HOXA10-AS knockdown severely impairs the leukemic growth of KMT2A-rearranged patient-derived xenografts in vivo, while high HOXA10-AS expression can serve as a marker of poor prognosis in AML patients. Lentiviral expression of HOXA10-AS blocks normal monocytic differentiation of human CD34+ hematopoietic stem and progenitor cells. Mechanistically, we show that HOXA10-AS localizes in the cytoplasm and acts in trans to induce NF-κB target genes. In total, our data imply that the normally HSC-specific HOXA10-AS is an oncogenic lncRNA in KMT2A-r AML. Thus, it may also represent a potential therapeutic target in KMT2A-rearranged AML.
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The ParaHox gene Cdx4 induces acute erythroid leukemia in mice. Blood Adv 2020; 3:3729-3739. [PMID: 31770439 DOI: 10.1182/bloodadvances.2019000761] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 10/04/2019] [Indexed: 11/20/2022] Open
Abstract
Acute erythroid leukemia (AEL) is a rare and aggressive form of acute leukemia, the biology of which remains poorly understood. Here we demonstrate that the ParaHox gene CDX4 is expressed in patients with acute erythroid leukemia, and that aberrant expression of Cdx4 induced homogenously a transplantable acute erythroid leukemia in mice. Gene expression analyses demonstrated upregulation of genes involved in stemness and leukemogenesis, with parallel downregulation of target genes of Gata1 and Gata2 responsible for erythroid differentiation. Cdx4 induced a proteomic profile that overlapped with a cluster of proteins previously defined to represent the most primitive human erythroid progenitors. Whole-exome sequencing of diseased mice identified recurrent mutations significantly enriched for transcription factors involved in erythroid lineage specification, as well as TP53 target genes partly identical to the ones reported in patients with AEL. In summary, our data indicate that Cdx4 is able to induce stemness and inhibit terminal erythroid differentiation, leading to the development of AEL in association with co-occurring mutations.
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Guo C, Ju QQ, Zhang CX, Gong M, Li ZL, Gao YY. Overexpression of HOXA10 is associated with unfavorable prognosis of acute myeloid leukemia. BMC Cancer 2020; 20:586. [PMID: 32571260 PMCID: PMC7310421 DOI: 10.1186/s12885-020-07088-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 06/18/2020] [Indexed: 12/16/2022] Open
Abstract
Background HOXA family genes were crucial transcription factors involving cell proliferation and apoptosis. While few studies have focused on HOXA10 in AML. We aimed to investigate the prognostic significance of HOXA10. Methods We downloaded datasets from GEO and BeatAML database, to compare HOXA expression level between AML patients and controls. Kaplan-Meier curves were used to estimate the impact of HOXA10 expression on AML survival. The differentially expressed genes, miRNAs, lncRNAs and methylated regions between HOXA10-high and -low groups were obtained using R (version 3.6.0). Accordingly, the gene set enrichment analysis (GSEA) was accomplished using MSigDB database. Moreover, the regulatory TFs/microRNAs/lncRNAs of HOXA10 were identified. A LASSO-Cox model fitted OS to clinical and HOXA10-associated genetic variables by glmnet package. Results HOXA10 was overexpressed in AML patients than that in controls. The HOXA10-high group is significantly associated with shorter OS and DFS. A total of 1219 DEGs, 131 DEmiRs, 282 DElncRs were identified to be associated with HOXA10. GSEA revealed that 12 suppressed and 3 activated pathways in HOXA10-high group. Furthermore, the integrated regulatory network targeting HOXA10 was established. The LASSO-Cox model fitted OS to AML-survival risk scores, which included age, race, molecular risk, expression of IKZF2/LINC00649/LINC00839/FENDRR and has-miR-424-5p. The time dependent ROC indicated a satisfying AUC (1-year AUC 0.839, 3-year AUC 0.871 and 5-year AUC 0.813). Conclusions Our study identified HOXA10 overexpression as an adverse prognostic factor for AML. The LASSO-COX regression analysis revealed novel prediction model of OS with superior diagnostic utility.
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Affiliation(s)
- Chao Guo
- Department of Hematology, China-Japan Friendship Hospital, Yinghua East Street, Beijing, China
| | - Qian-Qian Ju
- Department of Hematology, China-Japan Friendship Hospital, Yinghua East Street, Beijing, China
| | - Chun-Xia Zhang
- Department of Hematology, China-Japan Friendship Hospital, Yinghua East Street, Beijing, China
| | - Ming Gong
- Department of Hematology, China-Japan Friendship Hospital, Yinghua East Street, Beijing, China
| | - Zhen-Ling Li
- Department of Hematology, China-Japan Friendship Hospital, Yinghua East Street, Beijing, China
| | - Ya-Yue Gao
- Department of Hematology, China-Japan Friendship Hospital, Yinghua East Street, Beijing, China.
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Xu P, Zhou D, Yan G, Ouyang J, Chen B. Correlation of miR-181a and three HOXA genes as useful biomarkers in acute myeloid leukemia. Int J Lab Hematol 2019; 42:16-22. [PMID: 31670914 DOI: 10.1111/ijlh.13116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 09/16/2019] [Accepted: 09/21/2019] [Indexed: 01/23/2023]
Abstract
INTRODUCTION MiR-181a is a small, noncoding RNA that plays important roles in the pathogenesis and prognosis of acute myeloid leukemia (AML). A group of HOXA genes, including HOXA7, HOXA9, and HOXA11, has been established as an independent predictor for AML prognosis. In this study, we aimed to investigate the association between miR-181a and HOXA7, HOXA9, and HOXA11 and explore their roles in predicting prognosis in AML. PATIENTS AND METHODS Bone marrow samples of 46 untreated AML patients and 9 healthy donors were collected. Mononuclear cells were purified using density-gradient centrifugation in Ficoll, and quantitative real-time PCR was used to detect miR-181a and HOXA gene expression level. RESULTS HOXA7, HOXA9, and HOXA11 were negatively correlated with miR-181a, and their expression levels varied among AML subtypes, karyotypes, and risk status. Higher miR-181a and lower HOXA gene expressions were significantly associated with lower risk status and better response to chemotherapy. CONCLUSION In our study, we found miR-181a expression was negatively correlated with three HOXA genes and they were associated with AML risk status and prognosis in granulocytic AML. It further supported that miR-181a could be a useful marker for AML prognosis and possibly worked by regulating HOXA gene clusters.
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Affiliation(s)
- Peipei Xu
- Department of Hematology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Di Zhou
- Department of Hematology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Guijun Yan
- Department of Reproductive Medicine, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Jian Ouyang
- Department of Hematology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Bing Chen
- Department of Hematology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
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Darvishi M, Mashati P, Khosravi A. The clinical significance of CDX2 in leukemia: A new perspective for leukemia research. Leuk Res 2018; 72:45-51. [PMID: 30096576 DOI: 10.1016/j.leukres.2018.07.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 07/19/2018] [Accepted: 07/24/2018] [Indexed: 02/06/2023]
Abstract
CDX2 gene encodes a transcription factor involved in primary embryogenesis and hematopoietic development; however, the expression of CDX2 in adults is restricted to intestine and is not observed in blood tissues. The ectopic expression of CDX2 has been frequently observed in acute myeloid and lymphoid leukemia which in most cases is concomitant with poor prognosis. Induction of CDX2 in mice leads to hematologic complications, showing the leukemogenic origin of this gene. CDX2 plays significant role in the most critical pathways as the regulator of important transcription factors targeting cell proliferation, multi-drug resistance and survival. On the whole, the results indicate that CDX2 has the potential to be suggested as the diagnostic marker in hematologic malignancies. This review discusses the role of aberrant expression of CDX2 in the prognosis and the response to treatment in patients with different leukemia in clinical reports in the recent decades. The improvement in this regard could be of high importance in diagnosis and treatment methods.
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Affiliation(s)
- Mina Darvishi
- Department of Hematology and Blood Bank, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Pargol Mashati
- Department of Hematology and Blood Bank, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abbas Khosravi
- Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran; Hematopoietic Stem Cell Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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10
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Role of HOX Genes in Stem Cell Differentiation and Cancer. Stem Cells Int 2018; 2018:3569493. [PMID: 30154863 PMCID: PMC6081605 DOI: 10.1155/2018/3569493] [Citation(s) in RCA: 115] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 05/08/2018] [Accepted: 05/15/2018] [Indexed: 02/07/2023] Open
Abstract
HOX genes encode an evolutionarily conserved set of transcription factors that control how the phenotype of an organism becomes organized during development based on its genetic makeup. For example, in bilaterian-type animals, HOX genes are organized in gene clusters that encode anatomic segment identity, that is, whether the embryo will form with bilateral symmetry with a head (anterior), tail (posterior), back (dorsal), and belly (ventral). Although HOX genes are known to regulate stem cell (SC) differentiation and HOX genes are dysregulated in cancer, the mechanisms by which dysregulation of HOX genes in SCs causes cancer development is not fully understood. Therefore, the purpose of this manuscript was (i) to review the role of HOX genes in SC differentiation, particularly in embryonic, adult tissue-specific, and induced pluripotent SC, and (ii) to investigate how dysregulated HOX genes in SCs are responsible for the development of colorectal cancer (CRC) and acute myeloid leukemia (AML). We analyzed HOX gene expression in CRC and AML using information from The Cancer Genome Atlas study. Finally, we reviewed the literature on HOX genes and related therapeutics that might help us understand ways to develop SC-specific therapies that target aberrant HOX gene expression that contributes to cancer development.
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11
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Trissal MC, Wong TN, Yao JC, Ramaswamy R, Kuo I, Baty J, Sun Y, Jih G, Parikh N, Berrien-Elliott MM, Fehniger TA, Ley TJ, Maillard I, Reddy PR, Link DC. MIR142 Loss-of-Function Mutations Derepress ASH1L to Increase HOXA Gene Expression and Promote Leukemogenesis. Cancer Res 2018; 78:3510-3521. [PMID: 29724719 DOI: 10.1158/0008-5472.can-17-3592] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 03/12/2018] [Accepted: 04/23/2018] [Indexed: 12/22/2022]
Abstract
Point mutations in the seed sequence of miR-142-3p are present in a subset of acute myelogenous leukemia (AML) and in several subtypes of B-cell lymphoma. Here, we show that mutations associated with AML result both in loss of miR-142-3p function and in decreased miR-142-5p expression. Mir142 loss altered the hematopoietic differentiation of multipotent hematopoietic progenitors, enhancing their myeloid potential while suppressing their lymphoid potential. During hematopoietic maturation, loss of Mir142 increased ASH1L protein expression and consequently resulted in the aberrant maintenance of Hoxa gene expression in myeloid-committed hematopoietic progenitors. Mir142 loss also enhanced the disease-initiating activity of IDH2-mutant hematopoietic cells in mice. Together these data suggest a novel model in which miR-142, through repression of ASH1L activity, plays a key role in suppressing HOXA9/A10 expression during normal myeloid differentiation. AML-associated loss-of-function mutations of MIR142 disrupt this negative signaling pathway, resulting in sustained HOXA9/A10 expression in myeloid progenitors/myeloblasts and ultimately contributing to leukemic transformation.Significance: These findings provide mechanistic insights into the role of miRNAs in leukemogenesis and hematopoietic stem cell function. Cancer Res; 78(13); 3510-21. ©2018 AACR.
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Affiliation(s)
- Maria C Trissal
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Terrence N Wong
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Juo-Chin Yao
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Rahul Ramaswamy
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Iris Kuo
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Jack Baty
- Division of Biostatistics, Washington University, St. Louis, Missouri
| | - Yaping Sun
- Division of Hematology-Oncology, University of Michigan, Ann Arbor, Michigan
| | - Gloria Jih
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan
| | - Nishi Parikh
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan
| | | | - Todd A Fehniger
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Timothy J Ley
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri
| | - Ivan Maillard
- Division of Hematology-Oncology, University of Michigan, Ann Arbor, Michigan.,Life Sciences Institute, University of Michigan, Ann Arbor, Michigan.,Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, Michigan
| | - Pavan R Reddy
- Division of Hematology-Oncology, University of Michigan, Ann Arbor, Michigan
| | - Daniel C Link
- Division of Oncology, Washington University School of Medicine, St. Louis, Missouri.
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Hasan S, Naqvi AR, Rizvi A. Transcriptional Regulation of Emergency Granulopoiesis in Leukemia. Front Immunol 2018; 9:481. [PMID: 29593731 PMCID: PMC5858521 DOI: 10.3389/fimmu.2018.00481] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 02/23/2018] [Indexed: 12/16/2022] Open
Abstract
Neutropenic conditions are prevalent in leukemia patients and are often associated with increased susceptibility to infections. In fact, emergency granulopoiesis (EG), a process regulating neutrophil homeostasis in inflammatory conditions and infections, may occur improperly in leukemic conditions, leading to reduced neutrophil counts. Unfortunately, the mechanisms central to dysfunctional EG remain understudied in both leukemia patients and leukemic mouse models. However, despite no direct studies on EG response in leukemia are reported, recently certain transcription factors (TFs) have been found to function at the crossroads of leukemia and EG. In this review, we present an update on TFs that can potentially govern the fate of EG in leukemia. Transcriptional control of Fanconi DNA repair pathway genes is also highlighted, as well as the newly discovered role of Fanconi proteins in innate immune response and EG. Identifying the TFs regulating EG in leukemia and dissecting their underlying mechanisms may facilitate the discovery of therapeutic drugs for the treatment of neutropenia.
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Affiliation(s)
- Shirin Hasan
- Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Afsar R Naqvi
- Department of Periodontics, University of Illinois at Chicago, Chicago, IL, United States
| | - Asim Rizvi
- Department of Biochemistry, Aligarh Muslim University, Aligarh, India
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13
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Wang H, Bei L, Shah CA, Huang W, Platanias LC, Eklund EA. The E3 ubiquitin ligase Triad1 influences development of Mll-Ell-induced acute myeloid leukemia. Oncogene 2018; 37:2532-2544. [PMID: 29459712 PMCID: PMC5945580 DOI: 10.1038/s41388-018-0131-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 10/22/2017] [Accepted: 12/05/2017] [Indexed: 01/18/2023]
Abstract
Chromosomal translocations involving the MLL1 gene characterize a poor prognosis subset of acute myeloid leukemia (AML), referred to as 11q23-AML. Transcription of the HOXA9 and HOXA10 genes is enhanced in hematopoietic stem and progenitor cells in these leukemias. We previously found the ARIH2 gene was repressed by HoxA9 in myeloid progenitors, but activated by HoxA10 during granulopoiesis. ARIH2 encodes the Triad1 protein, an anti-proliferative E3 ubiquitin ligase. In the current study, we investigate the role of Triad1 in leukemogenesis induced by an MLL1 fusion protein (Mll-Ell). We found Mll-Ell increased expression of HoxA9, HoxA10, and Triad1 because HoxA9 represses only one of two ARIH2 cis elements that are activated by HoxA10. Although Triad1 antagonized the generally pro-proliferative effects of the Mll-Ell oncoprotein, we found blocking HoxA9 and HoxA10 phosphorylation shifted the balance to ARIH2 repression in Mll-Ell+ cells. We investigated the significance of these in vitro results in a murine bone marrow transplant model. We found Triad1 knockdown significantly shortened the latency to development of AML in mice transplanted with Mll-Ell-transduced bone marrow. And, Triad1 expression fell during the prolonged AML latency period in mice transplanted with bone marrow expressing Mll-Ell alone. Our studies identify Triad1 as a leukemia suppressor in 11q23-AML. This suggests defining relevant Triad1 substrates may indicate novel therapeutic targets in this disease.
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Affiliation(s)
- Hao Wang
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Ling Bei
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA
| | - Chirag A Shah
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA
| | - Weiqi Huang
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Leonidas C Platanias
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA
| | - Elizabeth A Eklund
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA. .,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA.
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14
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Shah CA, Bei L, Wang H, Altman JK, Platanias LC, Eklund EA. Cooperation between AlphavBeta3 integrin and the fibroblast growth factor receptor enhances proliferation of Hox-overexpressing acute myeloid leukemia cells. Oncotarget 2018; 7:54782-54794. [PMID: 27340869 PMCID: PMC5342381 DOI: 10.18632/oncotarget.10189] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 06/03/2016] [Indexed: 11/25/2022] Open
Abstract
A poor prognosis subtype of acute myeloid leukemia (AML) is characterized by increased expression of a set of homeodomain (HD) transcription factors, including HoxA9, HoxA10 and Cdx4. This encompasses AML with MLL1 gene translocations, because Mll1-fusion proteins aberrantly activate HOX transcription. We previously identified FGF2 (Fibroblast Growth Factor 2) as a target gene for HoxA9 and HoxA10 that was indirectly activated by Mll-Ell (an Mll1-fusion protein). Autocrine stimulation of Mll-Ell+ myeloid progenitor cells by Fgf2 stabilized βcatenin and increased expression of βcatenin target genes, including CDX4. Since HOXA9 and HOXA10 are Cdx4 target genes, Fgf2 indirectly augmented direct effects of Mll-Ell on these genes. ITGB3, encoding β3 integrin, is another HoxA10 target gene. In the current studies, we found activation of ITGB3 transcription in Mll-Ell+ myeloid progenitor cells via HoxA9 and HoxA10. Increased expression of αvβ3 integrin increased Syk-activation; contributing to cytokine hypersensitivity. However, inhibiting Fgf-R partly reversed αvβ3 activity in Mll-Ell+ progenitor cells by decreasing ITGB3 promoter activity in a βcatenin- and Cdx4-dependent manner. Inhibitors of Fgf-R or Syk impaired proliferation of CD34+ bone marrow cells from AML subjects with increased Hox-expression; with a greater combined effect. These studies identified a rational therapeutic approach to this AML subtype.
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Affiliation(s)
- Chirag A Shah
- The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA
| | - Ling Bei
- The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA
| | - Hao Wang
- The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA
| | - Jessica K Altman
- The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA
| | - Leonidas C Platanias
- The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA
| | - Elizabeth A Eklund
- The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL, USA.,Jesse Brown Veteran's Administration Medical Center, Chicago, IL, USA
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15
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Trinh BQ, Barengo N, Kim SB, Lee JS, Zweidler-McKay PA, Naora H. The homeobox gene DLX4 regulates erythro-megakaryocytic differentiation by stimulating IL-1β and NF-κB signaling. J Cell Sci 2015. [PMID: 26208636 PMCID: PMC4541043 DOI: 10.1242/jcs.168187] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Megakaryocyte and erythroid development are tightly controlled by a repertoire of cytokines, but it is not clear how cytokine-activated signaling pathways are controlled during development of these two lineages. Here, we identify that expression of DLX4, a transcription factor encoded by a homeobox gene, increases during megakaryopoiesis but decreases during erythropoiesis. Enforced expression of DLX4 in CD34(+) stem and progenitor cells and in bipotent K562 cells induced lineage markers and morphologic features of megakaryocytes and repressed erythroid marker expression and hemoglobin levels. Converse results were obtained when DLX4 was knocked down. Gene Ontology and Gene Set Enrichment Analyses of genome-wide changes in gene expression revealed that DLX4 induces a megakaryocytic transcriptional program and inhibits an erythroid transcriptional program. DLX4 also induced gene signatures that are associated with nuclear factor κB (NF-κB) signaling. The ability of DLX4 to promote megakaryocyte development at the expense of erythroid generation was diminished by blocking NF-κB activity or by repressing IL1B, a transcriptional target of DLX4. Collectively, our findings indicate that DLX4 exerts opposing effects on the megakaryocytic and erythroid lineages in part by inducing IL-1β and NF-κB signaling.
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Affiliation(s)
- Bon Q Trinh
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Box 108, Houston, TX 77030, USA
| | - Nicolas Barengo
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Box 108, Houston, TX 77030, USA
| | - Sang Bae Kim
- Department of Systems Biology, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Box 950, Houston, TX 77030, USA
| | - Ju-Seog Lee
- Department of Systems Biology, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Box 950, Houston, TX 77030, USA
| | - Patrick A Zweidler-McKay
- Division of Pediatrics, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Box 853, Houston, TX 77030, USA
| | - Honami Naora
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Box 108, Houston, TX 77030, USA
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16
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Zearalenone mycotoxin affects immune mediators, MAPK signalling molecules, nuclear receptors and genome-wide gene expression in pig spleen. PLoS One 2015; 10:e0127503. [PMID: 26011631 PMCID: PMC4444191 DOI: 10.1371/journal.pone.0127503] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 04/16/2015] [Indexed: 11/19/2022] Open
Abstract
The toxicity of zearalenone (ZEA) was evaluated in swine spleen, a key organ for the innate and adaptative immune response. Weaned pigs were fed for 18 days with a control or a ZEA contaminated diet. The effect of ZEA was assessed on wide genome expression, pro- (TNF-α, IL-8, IL-6, IL-1β, IFN-γ) and anti-inflammatory (IL-10, IL-4) cytokines, other molecules involved in inflammatory processes (MMPs/TIMPs), as well as signaling molecules, (p38/JNK1/JNK2-MAPKs) and nuclear receptors (PPARγ/NFkB/AP-1/STAT3/c-JUN). Microarray analysis showed that 46% of total number of differentially expressed genes was involved in cellular signaling pathway, 13% in cytokine network and 10% in the inflammatory response. ZEA increased expression and synthesis of pro- inflammatory (TNF-α, IL-8, IL-6, IL-1β) and had no effect on IFN-γ, IL-4 and IL-10 cytokines in spleen. The inflammatory stimulation might be a consequence of JNK pathway activation rather than of p-38MAPK and NF-kB involvement whose gene and protein expression were suppressed by ZEA action. In summary, our findings indicated the role of ZEA as an immune disruptor at spleen level.
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17
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Xenograft models for normal and malignant stem cells. Blood 2015; 125:2630-40. [DOI: 10.1182/blood-2014-11-570218] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 03/04/2015] [Indexed: 12/18/2022] Open
Abstract
Abstract
The model systems available for studying human hematopoiesis, malignant hematopoiesis, and hematopoietic stem cell (HSC) function in vivo have improved dramatically over the last decade, primarily due to improvements in xenograft mouse strains. Several recent reviews have focused on the historic development of immunodeficient mice over the last 2 decades, as well as their use in understanding human HSC and leukemia stem cell (LSC) biology and function in the context of a humanized mouse. However, in the intervening time since these reviews, a number of new mouse models, technical approaches, and scientific advances have been made. In this review, we update the reader on the newest and best models and approaches available for studying human malignant and normal HSCs in immunodeficient mice, including newly developed mice for use in chemotherapy testing and improved techniques for humanizing mice without laborious purification of HSC. We also review some relevant scientific findings from xenograft studies and highlight the continued limitations that confront researchers working with human HSC and LSC in vivo.
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Wang Y, Jin W, Jia X, Luo R, Tan Y, Zhu X, Yang X, Wang X, Wang K. Transcriptional repression of CDKN2D by PML/RARα contributes to the altered proliferation and differentiation block of acute promyelocytic leukemia cells. Cell Death Dis 2014; 5:e1431. [PMID: 25275592 PMCID: PMC4649503 DOI: 10.1038/cddis.2014.388] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 07/09/2014] [Accepted: 07/14/2014] [Indexed: 01/14/2023]
Abstract
Cell proliferation and differentiation are highly coordinated processes. These two processes are disrupted during leukemogenesis, resulting in differentiation block and uncontrolled proliferation in leukemia. To understand the mechanisms disrupting the coordination between the two processes in acute promyelocytic leukemia (APL), we investigated the regulatory mechanism of the negative cell cycle regulator CDKN2D by the promyelocytic leukemia/retinoic acid receptor α (PML/RARα) fusion protein and the role of CDKN2D in cell differentiation and proliferation. We found that CDKN2D expression in APL cells was significantly lower than that in normal promyelocytes. By chromatin immunoprecipitation and luciferase reporter assays, we showed that PML/RARα directly bound to and inhibited the transactivation of the CDKN2D promoter. Further evidence by the truncated and mutated CDKN2D promoters revealed that the everted repeat 8 (ER8) motif on the promoter was the binding site of PML/RARα. Forced expression of CDKN2D induced G0/G1 phase arrest and partial granulocytic differentiation in APL-derived NB4 cells, suggesting the function of CDKN2D in regulating both cell proliferation and granulocytic differentiation. Furthermore, all-trans retinoic acid (ATRA) significantly induced CDKN2D expression in APL cells and knockdown of CDKN2D expression during ATRA treatment partially blocked the ATRA-induced differentiation and cell cycle arrest. Collectively, our data indicate that CDKN2D repression by PML/RARα disrupts both cell proliferation and differentiation in the pathogenesis of APL, and induced expression of CDKN2D by ATRA alleviates the disruption of both processes to ensure treatment efficiency. This study provides a mechanism for coupling proliferation and differentiation in leukemic cells through the action of CDKN2D.
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Affiliation(s)
- Y Wang
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - W Jin
- 1] State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China [2] Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200025, China [3] Sino-French Research Center for Life Sciences and Genomics, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - X Jia
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - R Luo
- School of Life Sciences/Center for Computational Systems Biology, Fudan University, Shanghai, 200433, China
| | - Y Tan
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - X Zhu
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - X Yang
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - X Wang
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - K Wang
- 1] State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China [2] Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200025, China [3] Sino-French Research Center for Life Sciences and Genomics, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
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19
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Ng RK, Kong CT, So CC, Lui WC, Chan YF, Leung KC, So KC, Tsang HM, Chan LC, Sham MH. Epigenetic dysregulation of leukaemic HOX code inMLL-rearranged leukaemia mouse model. J Pathol 2013; 232:65-74. [DOI: 10.1002/path.4279] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 09/19/2013] [Accepted: 09/22/2013] [Indexed: 01/13/2023]
Affiliation(s)
- Ray Kit Ng
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
- Centre for Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Cheuk Ting Kong
- Department of Biochemistry; University of Hong Kong, Pokfulam; Hong Kong SAR China
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
- Centre for Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Chi Chiu So
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
- Centre for Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Wing Chi Lui
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Yuen Fan Chan
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Ka Chun Leung
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Kam Chung So
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Ho Man Tsang
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Li Chong Chan
- SH Ho Foundation Research Laboratories, Department of Pathology, Hong Kong Jockey Club Clinical Research Centre; University of Hong Kong, Pokfulam; Hong Kong SAR China
- Centre for Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine; University of Hong Kong, Pokfulam; Hong Kong SAR China
| | - Mai Har Sham
- Department of Biochemistry; University of Hong Kong, Pokfulam; Hong Kong SAR China
- Centre for Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine; University of Hong Kong, Pokfulam; Hong Kong SAR China
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20
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Bromodomain-PHD finger protein 1 is critical for leukemogenesis associated with MOZ-TIF2 fusion. Int J Hematol 2013; 99:21-31. [PMID: 24258712 DOI: 10.1007/s12185-013-1466-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Revised: 11/03/2013] [Accepted: 11/05/2013] [Indexed: 01/28/2023]
Abstract
Chromosomal translocations that involve the monocytic leukemia zinc finger (MOZ) gene are typically associated with human acute myeloid leukemia (AML) and often predict a poor prognosis. Overexpression of HOXA9, HOXA10, and MEIS1 was observed in AML patients with MOZ fusions. To assess the functional role of HOX upregulation in leukemogenesis by MOZ-TIF2, we focused on bromodomain-PHD finger protein 1 (BRPF1), a component of the MOZ complex that carries out histone acetylation for generating and maintaining proper epigenetic programs in hematopoietic cells. Immunoprecipitation analysis showed that MOZ-TIF2 forms a stable complex with BRPF1, and chromatin immunoprecipitation analysis showed that MOZ-TIF2 and BRPF1 interact with HOX genes in MOZ-TIF2-induced AML cells. Depletion of BRPF1 decreased the MOZ localization on HOX genes, resulting in loss of transformation ability induced by MOZ-TIF2. Furthermore, mutant MOZ-TIF2 engineered to lack histone acetyltransferase activity was incapable of deregulating HOX genes as well as initiating leukemia. These data indicate that MOZ-TIF2/BRPF1 complex upregulates HOX genes mediated by MOZ-dependent histone acetylation, leading to the development of leukemia. We suggest that activation of BRPF1/HOX pathway through MOZ HAT activity is critical for MOZ-TIF2 to induce AML.
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21
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Shah CA, Bei L, Wang H, Platanias LC, Eklund EA. The leukemia-associated Mll-Ell oncoprotein induces fibroblast growth factor 2 (Fgf2)-dependent cytokine hypersensitivity in myeloid progenitor cells. J Biol Chem 2013; 288:32490-32505. [PMID: 24089521 DOI: 10.1074/jbc.m113.496109] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The subset of acute myeloid leukemias (AML) with chromosomal translocations involving the MLL gene have a poor prognosis (referred to as 11q23-AML). The MLL fusion proteins that are expressed in 11q23-AML facilitate transcription of a set of HOX genes, including HOXA9 and HOXA10. Because Hox proteins are transcription factors, this suggests the possibility that Hox target genes mediate the adverse effects of MLL fusion proteins in leukemia. Identifying such Hox target genes might provide insights to the pathogenesis and treatment of 11q23-AML. In the current study we found that Mll-Ell (an MLL fusion protein) induced transcriptional activation of the FGF2 gene in a HoxA9- and HoxA10-dependent manner. FGF2 encodes fibroblast growth factor 2 (also referred to as basic fibroblast growth factor). Fgf2 influences proliferation and survival of hematopoietic stem cells and myeloid progenitor cells, and increased Fgf2-expression has been described in AMLs. We determined that expression of Mll-Ell in myeloid progenitor cells resulted in autocrine production of Fgf2 and Fgf2-dependent cytokine hypersensitivity. Therefore, our results implicated increased Fgf2 expression in progenitor proliferation and expansion in 11q23-AML. Because small molecule inhibitors of Fgf-receptors are in human clinical trials, this suggested a potential therapeutic approach to this treatment refractory leukemia.
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Affiliation(s)
- Chirag A Shah
- From The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611
| | - Ling Bei
- From The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611; the Jesse Brown Veterans Administration Medical Center, Chicago, Illinois 60612
| | - Hao Wang
- From The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611
| | - Leonidas C Platanias
- From The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611; the Jesse Brown Veterans Administration Medical Center, Chicago, Illinois 60612
| | - Elizabeth A Eklund
- From The Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611; the Jesse Brown Veterans Administration Medical Center, Chicago, Illinois 60612.
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22
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Yasmeen R, Meyers JM, Alvarez CE, Thomas JL, Bonnegarde-Bernard A, Alder H, Papenfuss TL, Benson DM, Boyaka PN, Ziouzenkova O. Aldehyde dehydrogenase-1a1 induces oncogene suppressor genes in B cell populations. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1833:3218-3227. [PMID: 24080087 DOI: 10.1016/j.bbamcr.2013.09.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 09/18/2013] [Accepted: 09/19/2013] [Indexed: 12/11/2022]
Abstract
The deregulation of B cell differentiation has been shown to contribute to autoimmune disorders, hematological cancers, and aging. We provide evidence that the retinoic acid-producing enzyme aldehyde dehydrogenase 1a1 (Aldh1a1) is an oncogene suppressor in specific splenic IgG1(+)/CD19(-) and IgG1(+)/CD19(+) B cell populations. Aldh1a1 regulated transcription factors during B cell differentiation in a sequential manner: 1) retinoic acid receptor alpha (Rara) in IgG1(+)/CD19(-) and 2) zinc finger protein Zfp423 and peroxisome proliferator-activated receptor gamma (Pparg) in IgG1(+)/CD19(+) splenocytes. In Aldh1a1(-/-) mice, splenic IgG1(+)/CD19(-) and IgG1(+)/CD19(+) B cells acquired expression of proto-oncogenic genes c-Fos, c-Jun, and Hoxa10 that resulted in splenomegaly. Human multiple myeloma B cell lines also lack Aldh1a1 expression; however, ectopic Aldh1a1 expression rescued Rara and Znf423 expressions in these cells. Our data highlight a mechanism by which an enzyme involved in vitamin A metabolism can improve B cell resistance to oncogenesis.
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Affiliation(s)
- R Yasmeen
- Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA
| | - J M Meyers
- Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA
| | - C E Alvarez
- Center for Molecular and Human Genetics, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA; Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - J L Thomas
- Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA
| | - A Bonnegarde-Bernard
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA
| | - H Alder
- Nucleic Acid Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA
| | - T L Papenfuss
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA
| | - D M Benson
- Division of Hematology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA
| | - P N Boyaka
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA
| | - O Ziouzenkova
- Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA.
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23
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Abstract
The homeobox (HOX) genes are a highly conserved family of homeodomain-containing transcription factors that specify cell identity in early development and, subsequently, in a number of adult processes including hematopoiesis. The dysregulation of HOX genes is associated with a number of malignancies including acute myeloid leukemia (AML) and acute lymphoid leukemia (ALL), where they have been shown to support the immortalization of leukemic cells both as chimeric partners in fusion genes and when overexpressed in their wild-type form. This review covers our current understanding of the role of HOX genes in normal hematopoiesis, AML and ALL, with particular emphasis on the similarities and differences of HOX function in these contexts, their hematopoietic downstream gene targets and implications for therapy.
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24
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Bei L, Shah C, Wang H, Huang W, Roy R, Eklund EA. β-Catenin activates the HOXA10 and CDX4 genes in myeloid progenitor cells. J Biol Chem 2012; 287:39589-601. [PMID: 23038246 DOI: 10.1074/jbc.m112.402172] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
HoxA10 is a homeodomain transcription factor that is involved in maintenance of the myeloid progenitor population and implicated in myeloid leukemogenesis. Previously, we found that FGF2 and CDX4 are direct target genes of HoxA10 and that HOXA10 is a Cdx4 target gene. We also found that increased production of fibroblast growth factor 2 (Fgf2) by HoxA10-overexpressing myeloid progenitor cells results in activation of β-catenin in an autocrine manner. In this study, we identify novel cis elements in the CDX4 and HOXA10 genes that are activated by β-catenin in myeloid progenitor cells. We determine that β-catenin interacts with these cis elements, identifying both CDX4 and HOXA10 as β-catenin target genes in this context. We demonstrate that HoxA10-induced CDX4 transcription is influenced by Fgf2-dependent β-catenin activation. Similarly, Cdx4-induced HOXA10 transcription is influenced by β-catenin in an Fgf2-dependent manner. Increased expression of a set of Hox proteins, including HoxA10, is associated with poor prognosis in acute myeloid leukemia. Cdx4 contributes to leukemogenesis in Hox-overexpressing acute myeloid leukemia, and increased β-catenin activity is also associated with poor prognosis. The current studies identify a molecular mechanisms through which increased expression of HoxA10 increases Cdx4 expression by direct CDX4 activation and by Fgf2-induced β-catenin activity. This results in Cdx4-induced HoxA10-expression, creating a positive feedback mechanism.
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Affiliation(s)
- Ling Bei
- Feinberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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25
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Abstract
During the past decade it was recognized that homeobox gene families such as the clustered Hox genes play pivotal roles both in normal and malignant hematopoiesis. More recently, similar roles have also become apparent for members of the ParaHox gene cluster, evolutionarily closely related to the Hox gene cluster. This is in particular found for the caudal-type homeobox genes (Cdx) genes, known to act as upstream regulators of Hox genes. The CDX gene family member CDX2 belongs to the most frequent aberrantly expressed proto-oncogenes in human acute leukemias and is highly leukemogenic in experimental models. Correlative studies indicate that CDX2 functions as master regulator of perturbed HOX gene expression in human acute myeloid leukemia, locating this ParaHox gene at a central position for initiating and maintaining HOX gene dysregulation as a driving leukemogenic force. There are still few data about potential upstream regulators initiating aberrant CDX2 expression in human leukemias or about critical downstream targets of CDX2 in leukemic cells. Characterizing this network will hopefully open the way to therapeutic approaches that target deregulated ParaHox genes in human leukemia.
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Rapid generation of human B-cell lymphomas via combined expression of Myc and Bcl2 and their use as a preclinical model for biological therapies. Oncogene 2012; 32:1066-1072. [PMID: 22484426 DOI: 10.1038/onc.2012.117] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Although numerous mouse models of B-cell malignancy have been developed via the enforced expression of defined oncogenic lesions, the feasibility of generating lineage-defined human B-cell malignancies using mice reconstituted with modified human hematopoietic stem cells (HSCs) remains unclear. In fact, whether human cells can be transformed as readily as murine cells by simple oncogene combinations is a subject of considerable debate. Here, we describe the development of humanized mouse model of MYC/BCL2-driven 'double-hit' lymphoma. By engrafting human HSCs transduced with the oncogene combination into immunodeficient mice, we generate a fatal B malignancy with complete penetrance. This humanized-MYC/BCL2-model (hMB) accurately recapitulates the histopathological and clinical aspects of steroid-, chemotherapy- and rituximab-resistant human 'double-hit' lymphomas that involve the MYC and BCL2 loci. Notably, this model can serve as a platform for the evaluation of antibody-based therapeutics. As a proof of principle, we used this model to show that the anti-CD52 antibody alemtuzumab effectively eliminates lymphoma cells from the spleen, liver and peripheral blood, but not from the brain. The hMB humanized mouse model underscores the synergy of MYC and BCL2 in 'double-hit' lymphomas in human patients. Additionally, our findings highlight the utility of humanized mouse models in interrogating therapeutic approaches, particularly human-specific monoclonal antibodies.
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Shah CA, Bei L, Wang H, Platanias LC, Eklund EA. HoxA10 protein regulates transcription of gene encoding fibroblast growth factor 2 (FGF2) in myeloid cells. J Biol Chem 2012; 287:18230-48. [PMID: 22493287 DOI: 10.1074/jbc.m111.328401] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
HoxA10 is a member of a highly conserved family of homeodomain transcription factors that are involved in definitive hematopoiesis and implicated in the pathogenesis of acute myeloid leukemia (AML). During normal hematopoiesis, HoxA10 facilitates myeloid progenitor expansion and impedes myeloid differentiation. To better understand the molecular mechanisms that control these events, we have been identifying and characterizing HoxA10 target genes. In this study, we identified the gene encoding fibroblast growth factor 2 (Fgf2 or basic fibroblast growth factor) as a target gene that is relevant to the biological effects of HoxA10. We identified two cis elements in the proximal FGF2 promoter that are activated by HoxA10 in myeloid progenitor cells and differentiating phagocytes. We determined that Fgf2 expression and secretion are regulated in a HoxA10-dependent manner in these cells. We found that increased Fgf2 production by HoxA10-overexpressing myeloid progenitor cells induced a phosphoinositol 3-kinase-dependent increase in β-catenin protein. This resulted in autocrine stimulation of proliferation in HoxA10-overexpressing cells and hypersensitivity to other cytokines that share this pathway. Therefore, these studies identified expression of Fgf2 as a mechanism by which HoxA10 controls the size of the myeloid progenitor population. These studies also suggested that aberrant production of Fgf2 may contribute to leukemogenesis in the subset of AML with dysregulated Hox expression. Therapeutic targeting of Fgf2-stimulated signaling pathways might be a rational approach to this poor prognosis subset of AML.
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Affiliation(s)
- Chirag A Shah
- Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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28
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Heuser M, Yun H, Berg T, Yung E, Argiropoulos B, Kuchenbauer F, Park G, Hamwi I, Palmqvist L, Lai CK, Leung M, Lin G, Chaturvedi A, Thakur BK, Iwasaki M, Bilenky M, Thiessen N, Robertson G, Hirst M, Kent D, Wilson NK, Göttgens B, Eaves C, Cleary ML, Marra M, Ganser A, Humphries RK. Cell of origin in AML: susceptibility to MN1-induced transformation is regulated by the MEIS1/AbdB-like HOX protein complex. Cancer Cell 2011; 20:39-52. [PMID: 21741595 PMCID: PMC3951989 DOI: 10.1016/j.ccr.2011.06.020] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Revised: 04/03/2011] [Accepted: 06/06/2011] [Indexed: 12/14/2022]
Abstract
Pathways defining susceptibility of normal cells to oncogenic transformation may be valuable therapeutic targets. We characterized the cell of origin and its critical pathways in MN1-induced leukemias. Common myeloid (CMP) but not granulocyte-macrophage progenitors (GMP) could be transformed by MN1. Complementation studies of CMP-signature genes in GMPs demonstrated that MN1-leukemogenicity required the MEIS1/AbdB-like HOX-protein complex. ChIP-sequencing identified common target genes of MN1 and MEIS1 and demonstrated identical binding sites for a large proportion of their chromatin targets. Transcriptional repression of MEIS1 targets in established MN1 leukemias demonstrated antileukemic activity. As MN1 relies on but cannot activate expression of MEIS1/AbdB-like HOX proteins, transcriptional activity of these genes determines cellular susceptibility to MN1-induced transformation and may represent a promising therapeutic target.
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MESH Headings
- Animals
- Cell Transformation, Neoplastic/metabolism
- Cell Transformation, Neoplastic/pathology
- Gene Expression Profiling
- Gene Expression Regulation, Leukemic
- Genes, Dominant/genetics
- Granulocyte-Macrophage Progenitor Cells/metabolism
- Granulocyte-Macrophage Progenitor Cells/pathology
- Homeodomain Proteins/metabolism
- Humans
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/pathology
- Mice
- Mice, Inbred C57BL
- Models, Biological
- Multiprotein Complexes/metabolism
- Myeloid Ecotropic Viral Integration Site 1 Protein
- Neoplasm Proteins/metabolism
- Promoter Regions, Genetic/genetics
- Protein Binding
- Tumor Suppressor Proteins/metabolism
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Affiliation(s)
- Michael Heuser
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
- Department of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, 30625 Hannover, Germany
| | - Haiyang Yun
- Department of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, 30625 Hannover, Germany
| | - Tobias Berg
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Eric Yung
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Bob Argiropoulos
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Florian Kuchenbauer
- Department of Internal Medicine III, University Hospital Medical Center, 89075 Ulm, Germany
| | - Gyeongsin Park
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Iyas Hamwi
- Department of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, 30625 Hannover, Germany
| | - Lars Palmqvist
- Institute of Biomedicine, Sahlgrenska University Hospital, 413 45 Göteborg, Sweden
| | - Courteney K. Lai
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Malina Leung
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Grace Lin
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Anuhar Chaturvedi
- Department of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, 30625 Hannover, Germany
| | - Basant Kumar Thakur
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany
| | - Masayuki Iwasaki
- Department of Pathology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Mikhail Bilenky
- Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Nina Thiessen
- Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Gordon Robertson
- Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Martin Hirst
- Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - David Kent
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Nicola K. Wilson
- Department of Haematology, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
| | - Bertie Göttgens
- Department of Haematology, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
| | - Connie Eaves
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Michael L. Cleary
- Department of Pathology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Marco Marra
- Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
| | - Arnold Ganser
- Department of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School, 30625 Hannover, Germany
| | - R. Keith Humphries
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada
- Department of Medicine, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
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29
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Bei L, Huang W, Wang H, Shah C, Horvath E, Eklund E. HoxA10 activates CDX4 transcription and Cdx4 activates HOXA10 transcription in myeloid cells. J Biol Chem 2011; 286:19047-64. [PMID: 21471217 PMCID: PMC3099719 DOI: 10.1074/jbc.m110.213983] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 04/04/2011] [Indexed: 12/19/2022] Open
Abstract
HoxA10 is a homeodomain transcription factor that influences a number of developmental processes, including hematopoiesis. During definitive hematopoiesis, expression of HoxA10 is maximal in committed myeloid progenitor cells and decreases as differentiation proceeds. Aberrantly increased expression of HoxA10 was found in bone marrow cells in a poor prognosis subset of human acute myeloid leukemia (AML). Consistent with this, AML developed in mice transplanted with HoxA10-overexpressing bone marrow. However, relatively few target genes have been identified that explain the role of HoxA10 in leukemogenesis. In the current study, we identified CDX4 as a HoxA10 target gene. Cdx4 is a homeodomain transcription factor that was also implicated in myeloid leukemogenesis. Although relatively few Cdx4 target genes have been identified, Cdx4 was known to influence HOX gene transcription. We identified a HoxA10-binding cis element in the CDX4 promoter that activated transcription. We also identified a Cdx4-binding cis element that activated the HOXA10 promoter. Therefore, increased Cdx4 expression in HoxA10-overexpressing cells augmented transcription of the endogenous HOXA10 gene. Increased endogenous HoxA10 in these cells induced additional CDX4 transcription. We found that Cdx4 influenced transcription of HoxA10 target genes in a HoxA10-dependent manner. Similarly, HoxA10 influenced transcription of HOX genes in a Cdx4-dependent manner. We previously found that HoxA10-overexpressing myeloid progenitors were hypersensitive to a variety of cytokines. In the current studies, we found that Cdx4 knockdown decreased cytokine hypersensitivity of HoxA10-overexpressing cells. Therefore, these studies identified a positive feedback relationship between HoxA10 and Cdx4, which potentially amplified the contribution of either transcription factor to the pathogenesis of AML.
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Affiliation(s)
- Ling Bei
- From the Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and
- the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612
| | - Weiqi Huang
- From the Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and
- the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612
| | - Hao Wang
- From the Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and
| | - Chirag Shah
- From the Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and
| | - Elizabeth Horvath
- From the Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and
- the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612
| | - Elizabeth Eklund
- From the Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and
- the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612
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30
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Wang H, Bei L, Shah CA, Horvath E, Eklund EA. HoxA10 influences protein ubiquitination by activating transcription of ARIH2, the gene encoding Triad1. J Biol Chem 2011; 286:16832-45. [PMID: 21454682 DOI: 10.1074/jbc.m110.213975] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
HoxA10 is a homeodomain transcription factor that is maximally expressed in myeloid progenitor cells. An increase in HoxA10 expression correlates with poor prognosis in human acute myeloid leukemia (AML). Consistent with this scenario, HoxA10 overexpression in murine bone marrow induces a myeloproliferative neoplasm that advances AML over time. Despite the importance of HoxA10 for leukemogenesis, few genuine HoxA10 target genes have been identified. The current study identified ARIH2, the gene encoding Triad1, as a HoxA10 target gene. We identified two distinct HoxA10-binding cis elements in the ARIH2 promoter and determined that HoxA10 activates these cis elements in myeloid cells. Triad1 has E3 ubiquitin ligase activity, and we found that HoxA10-overexpressing myeloid cells exhibited a Triad1-dependent increase in protein ubiquitination. Therefore, these studies have identified the regulation of protein ubiquitination as a novel function of Hox transcription factors. Forced overexpression of Triad1 has been show previously to inhibit colony formation by myeloid progenitor cells. In contrast, HoxA10-overexpressing myeloid progenitor cells exhibited increased proliferation in response to low doses of various cytokines. We found that Triad1 knockdown further increased cytokine-induced proliferation in HoxA10-overexpressing cells. Therefore, these studies have identified a HoxA10 target gene that antagonizes the overall influence of overexpressed HoxA10 on myeloproliferation. This result suggests that the consequences of HoxA10 overexpression reflect a balance between the target genes that facilitate and antagonize proliferation. These results have implications for understanding the mechanisms of leukemogenesis in AML with Hox overexpression.
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Affiliation(s)
- Hao Wang
- Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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31
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Quéré R, Andradottir S, Brun ACM, Zubarev RA, Karlsson G, Olsson K, Magnusson M, Cammenga J, Karlsson S. High levels of the adhesion molecule CD44 on leukemic cells generate acute myeloid leukemia relapse after withdrawal of the initial transforming event. Leukemia 2010; 25:515-26. [PMID: 21116281 PMCID: PMC3072510 DOI: 10.1038/leu.2010.281] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Multiple genetic hits are detected in patients with acute myeloid leukemia (AML). To investigate this further, we developed a tetracycline-inducible mouse model of AML, in which the initial transforming event, overexpression of HOXA10, can be eliminated. Continuous overexpression of HOXA10 is required to generate AML in primary recipient mice, but is not essential for maintenance of the leukemia. Transplantation of AML to secondary recipients showed that in established leukemias, ∼80% of the leukemia-initiating cells (LICs) in bone marrow stopped proliferating upon withdrawal of HOXA10 overexpression. However, the population of LICs in primary recipients is heterogeneous, as ∼20% of the LICs induce leukemia in secondary recipients despite elimination of HOXA10-induced overexpression. Intrinsic genetic activation of several proto-oncogenes was observed in leukemic cells resistant to inactivation of the initial transformation event. Interestingly, high levels of the adhesion molecule CD44 on leukemic cells are essential to generate leukemia after removal of the primary event. This suggests that extrinsic niche-dependent factors are also involved in the host-dependent outgrowth of leukemias after withdrawal of HOXA10 overexpression event that initiates the leukemia.
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Affiliation(s)
- R Quéré
- Molecular Medicine and Gene Therapy, Division of Molecular Medicine and Gene Therapy, Lund Strategic Center for Stem Cell Biology and Cell Therapy, Lund University Hospital, Lund, Sweden
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32
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Shah CA, Wang H, Bei L, Platanias LC, Eklund EA. HoxA10 regulates transcription of the gene encoding transforming growth factor beta2 (TGFbeta2) in myeloid cells. J Biol Chem 2010; 286:3161-76. [PMID: 21087928 DOI: 10.1074/jbc.m110.183251] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
HoxA10 is a homeodomain transcription factor that is maximally expressed in myeloid progenitor cells. HoxA10 is overexpressed in a poor prognosis subset of human acute myeloid leukemia (AML) and in vivo overexpression of HoxA10 in murine bone marrow induces myeloid leukemia. HoxA10 contributes to myeloid progenitor expansion and differentiation block, but few target genes have been identified that explain the influence of HoxA10 on these processes. The current study identifies the gene encoding transforming growth factor β2 (TGFβ2) as a HoxA10 target gene. We found that HoxA10 activated TGFβ2 transcription by interacting with tandem cis elements in the promoter. We also determined that HoxA10 overexpression in myeloid progenitor cells increased Tgfβ2 production by the cells. Tgfβ2 stimulates proliferation of hematopoietic stem and progenitor cells. Therefore, these studies identified autocrine stimulation of myeloid progenitors by Tgfβ2 as one mechanism by which HoxA10 expands this population. Because HoxA proteins had not been previously known to influence expression of pro-proliferative cytokines, this has implications for understanding molecular mechanisms involved in progenitor expansion and the pathobiology of AML.
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Affiliation(s)
- Chirag A Shah
- Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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33
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The vent-like homeobox gene VENTX promotes human myeloid differentiation and is highly expressed in acute myeloid leukemia. Proc Natl Acad Sci U S A 2010; 107:16946-51. [PMID: 20833819 DOI: 10.1073/pnas.1001878107] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Recent data indicate that a variety of regulatory molecules active in embryonic development may also play a role in the regulation of early hematopoiesis. Here we report that the human Vent-like homeobox gene VENTX, a putative homolog of the Xenopus xvent2 gene, is a unique regulatory hematopoietic gene that is aberrantly expressed in CD34(+) leukemic stem-cell candidates in human acute myeloid leukemia (AML). Quantitative RT-PCR documented expression of the gene in lineage positive hematopoietic subpopulations, with the highest expression in CD33(+) myeloid cells. Notably, expression levels of VENTX were negligible in normal CD34(+)/CD38(-) or CD34(+) human progenitor cells. In contrast to this, leukemic CD34(+)/CD38(-) cells from AML patients with translocation t(8,21) and normal karyotype displayed aberrantly high expression of VENTX. Gene expression and pathway analysis demonstrated that in normal CD34(+) cells enforced expression of VENTX initiates genes associated with myeloid development and down-regulates genes involved in early lymphoid development. Functional analyses confirmed that aberrant expression of VENTX in normal CD34(+) human progenitor cells perturbs normal hematopoietic development, promoting generation of myeloid cells and impairing generation of lymphoid cells in vitro and in vivo. Stable knockdown of VENTX expression inhibited the proliferation of human AML cell lines. Taken together, these data extend our insights into the function of embryonic mesodermal factors in human postnatal hematopoiesis and indicate a role for VENTX in normal and malignant myelopoiesis.
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34
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Beauchesne PR, Bruce KJ, Bowen BD, Piret JM. Effect of cell lysates on retroviral transduction efficiency of cells in suspension culture. Biotechnol Bioeng 2010; 105:1168-77. [PMID: 20014140 DOI: 10.1002/bit.22634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Recombinant retroviruses are effective vectors able to integrate transgenes into the target cell's genome to achieve longer-term expression. This study investigates the effect of cell lysis products, a common cell culture by-product, on the transduction of suspension cells by gammaretroviral vectors. Cell lysates derived from human and murine suspension cell lines significantly increased the transduction of human TF-1 and K-562 cell lines by gibbon ape leukemia virus-pseudotyped retroviral vectors without altering tropism. The transduction efficiency of TF-1 cells increased as a function of lysate concentration and decreased with increasing target cell concentrations. This was adequately predicted using a saturation equation based on the lysed-to-target cell concentration ratio, R, where: Fold increase = 1+Fold_(Max) (R/(K_(L)+R)). Lysate completely masked the effects of fibronectin when the two were added in combination. With protamine sulfate, the transduction efficiency was increased by lysate to 58% from 20% for protamine sulfate alone. Overall, the presence of cell lysate significantly influenced the outcome of the transduction process, either alone or in the presence of protamine sulfate or fibronectin.
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Affiliation(s)
- Pascal R Beauchesne
- Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada
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35
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Tomaru Y, Simon C, Forrest AR, Miura H, Kubosaki A, Hayashizaki Y, Suzuki M. Regulatory interdependence of myeloid transcription factors revealed by Matrix RNAi analysis. Genome Biol 2009; 10:R121. [PMID: 19883503 PMCID: PMC2810662 DOI: 10.1186/gb-2009-10-11-r121] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Accepted: 11/02/2009] [Indexed: 01/22/2023] Open
Abstract
The knockdown of 78 transcription factors in differentiating human THP-1 cells using matrix RNAi reveals their interdependence Background With the move towards systems biology, we need sensitive and reliable ways to determine the relationships between transcription factors and their target genes. In this paper we analyze the regulatory relationships between 78 myeloid transcription factors and their coding genes by using the matrix RNAi system in which a set of transcription factor genes are individually knocked down and the resultant expression perturbation is quantified. Results Using small interfering RNAs we knocked down the 78 transcription factor genes in monocytic THP-1 cells and monitored the perturbation of the expression of the same 78 transcription factors and 13 other transcription factor genes as well as 5 non-transcription factor genes by quantitative real-time RT-PCR, thereby building a 78 × 96 matrix of perturbation and measurement. This approach identified 876 cases where knockdown of one transcription factor significantly affected the expression of another (from a potential 7,488 combinations). Our study also revealed cell-type-specific transcriptional regulatory networks in two different cell types. Conclusions By considering whether the targets of a given transcription factor are naturally up- or downregulated during phorbol 12-myristate 13-acetate-induced differentiation, we could classify these edges as pro-differentiative (229), anti-differentiative (76) or neither (571) using expression profiling data obtained in the FANTOM4 study. This classification analysis suggested that several factors could be involved in monocytic differentiation, while others such as MYB and the leukemogenic fusion MLL-MLLT3 could help to maintain the initial undifferentiated state by repressing the expression of pro-differentiative factors or maintaining expression of anti-differentiative factors.
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Affiliation(s)
- Yasuhiro Tomaru
- RIKEN Omics Science Center, RIKEN Yokohama Institute 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
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36
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Model systems for examining effects of leukemia-associated oncogenes in primary human CD34+ cells via retroviral transduction. Methods Mol Biol 2009; 538:263-85. [PMID: 19277588 DOI: 10.1007/978-1-59745-418-6_13] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The use of primary human cells to model cancer initiation and progression is now within the grasp of investigators. It has been nearly a decade since the first defined genetic elements were introduced into primary human epithelial and fibroblast cells to model oncogenesis. This approach has now been extended to the hematopoietic system, with the first described experimental transformation of primary human hematopoietic cells. Human cell model systems will lead to a better understanding of the species and cell type specific signals necessary for oncogenic initiation and progression, and will allow investigators to interrogate the cancer stem cell hypothesis using a well-defined hierarchical system that has been studied for decades. The molecular and biochemical link between self-renewal and differentiation can now be experimentally approached using primary human cells. In addition, the models that result from these experiments are likely to generate highly relevant systems for use in identification and validation of potential therapeutic targets as well as testing of small molecule therapeutics. We describe here the methodologies and reagents that are used to examine the effects of leukemia fusion protein expression on primary human hematopoietic cells, both in vitro and in vivo.
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37
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Severin J, Waterhouse AM, Kawaji H, Lassmann T, van Nimwegen E, Balwierz PJ, de Hoon MJ, Hume DA, Carninci P, Hayashizaki Y, Suzuki H, Daub CO, Forrest AR. FANTOM4 EdgeExpressDB: an integrated database of promoters, genes, microRNAs, expression dynamics and regulatory interactions. Genome Biol 2009; 10:R39. [PMID: 19374773 PMCID: PMC2688930 DOI: 10.1186/gb-2009-10-4-r39] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Revised: 03/09/2009] [Accepted: 04/19/2009] [Indexed: 11/28/2022] Open
Abstract
EdgeExpressDB is a novel database and set of interfaces for interpreting biological networks and comparing large high-throughput expression datasets. EdgeExpressDB is a novel database and set of interfaces for interpreting biological networks and comparing large high-throughput expression datasets that requires minimal development for new data types and search patterns. The FANTOM4 EdgeExpress database summarizes gene expression patterns in the context of alternative promoter structures and regulatory transcription factors and microRNAs using intuitive gene-centric and sub-network views. This is an important resource for gene regulation in acute myeloid leukemia, monocyte/macrophage differentiation and human transcriptional networks.
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Affiliation(s)
- Jessica Severin
- RIKEN Omics Science Center, RIKEN Yokohama Institute, 1-7-22 Suehiro-cho Tsurumi-ku Yokohama, Kanagawa, 230-0045 Japan.
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38
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Gemelli C, Orlandi C, Zanocco Marani T, Martello A, Vignudelli T, Ferrari F, Montanari M, Parenti S, Testa A, Grande A, Ferrari S. The vitamin D3/Hox-A10 pathway supports MafB function during the monocyte differentiation of human CD34+ hemopoietic progenitors. THE JOURNAL OF IMMUNOLOGY 2008; 181:5660-72. [PMID: 18832725 DOI: 10.4049/jimmunol.181.8.5660] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Although a considerable number of reports indicate an involvement of the Hox-A10 gene in the molecular control of hemopoiesis, the conclusions of such studies are quite controversial given that they support, in some cases, a role in the stimulation of stem cell self-renewal and myeloid progenitor expansion, whereas in others they implicate this transcription factor in the induction of monocyte-macrophage differentiation. To clarify this issue, we analyzed the biological effects and the transcriptome changes determined in human primary CD34(+) hemopoietic progenitors by retroviral transduction of a full-length Hox-A10 cDNA. The results obtained clearly indicated that this homeogene is an inducer of monocyte differentiation, at least partly acting through the up-regulation of the MafB gene, recently identified as the master regulator of such a maturation pathway. By using a combined approach based on computational analysis, EMSA experiments, and luciferase assays, we were able to demonstrate the presence of a Hox-A10-binding site in the promoter region of the MafB gene, which suggested the likely molecular mechanism underlying the observed effect. Stimulation of the same cells with the vitamin D(3) monocyte differentiation inducer resulted in a clear increase of Hox-A10 and MafB transcripts, indicating the existence of a precise transactivation cascade involving vitamin D(3) receptor, Hox-A10, and MafB transcription factors. Altogether, these data allow one to conclude that the vitamin D(3)/Hox-A10 pathway supports MafB function during the induction of monocyte differentiation.
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Affiliation(s)
- Claudia Gemelli
- Department of Biomedical Sciences, University of Modena and Reggio Emilia, Modena, Italy
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Kennedy JA, Barabé F. Investigating human leukemogenesis: from cell lines to in vivo models of human leukemia. Leukemia 2008; 22:2029-40. [DOI: 10.1038/leu.2008.206] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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40
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Constitutive Expression of the ATP-Binding Cassette Transporter ABCG2 Enhances the Growth Potential of Early Human Hematopoietic Progenitors. Stem Cells 2008; 26:810-8. [DOI: 10.1634/stemcells.2007-0527] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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41
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HOXA10 expression induced by Abl kinase inhibitors enhanced apoptosis through PI3K pathway in CML cells. Leuk Res 2008; 32:962-71. [PMID: 18190961 DOI: 10.1016/j.leukres.2007.11.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Revised: 11/25/2007] [Accepted: 11/26/2007] [Indexed: 11/23/2022]
Abstract
Chronic myelogenous leukemia is characterized by the reciprocal chromosomal translocation (9;22), which generates a novel fusion gene, BCR-ABL. Bcr-Abl-expressing leukemia cells are highly resistant to apoptosis. Imatinib an Abl kinase inhibitor, is a highly effective agent for patients with CML. However, a small percentage of these patients and most advanced-phase patients relapse on imatinib therapy. It is poorly understood whether the Abl kinase inhibitors are able to eradicate CML progenitor or stem cells. In this study, we investigated the role of HOXA10 in CML cell lines and the hematopoietic progenitor cells derived from CML patients, and whether the regulation of HOXA10 eradicates Bcr-Abl(+) hematopoietic stem/progenitor cells. The Abl kinase inhibitors and PI3K inhibitor, LY294002, induced the expression of HOXA10, and it enhanced apoptosis in CML cells. Moreover, the reduction of HOXA10 expression by siRNA in CML cells inhibited apoptosis by treatment with the Abl kinase inhibitors and LY294002. These results revealed that HOXA10 had an important role in induction of apoptosis by the Abl kinase inhibitors in CML cells. Finally, we showed that the inhibition of HOXA10 expression by siRNA increased the numbers of CFU-GEMM, BFU-E, and CFU-GM when the cells were treated with the combination of BMS354825 and LY294002 compared to control cells, and HOXA10 played a critical role in the committed colony-formation in CML. This study shows for the first time that the Abl kinase inhibitor and LY294002 induced HOXA10, and HOXA10 had an important role in apoptosis or cell growth inhibition in CML cells in vitro.
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Caudell D, Zhang Z, Chung YJ, Aplan PD. Expression of a CALM-AF10 fusion gene leads to Hoxa cluster overexpression and acute leukemia in transgenic mice. Cancer Res 2007; 67:8022-31. [PMID: 17804713 PMCID: PMC1986634 DOI: 10.1158/0008-5472.can-06-3749] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To assess the role of the CALM-AF10 fusion gene in leukemic transformation in vivo, we generated transgenic mice that expressed a CALM-AF10 fusion gene. Depending on the transgenic line, at least 40% to 50% of the F(1) generation mice developed acute leukemia at a median age of 12 months. Leukemic mice typically had enlarged spleens, invasion of parenchymal organs with malignant cells, and tumors with myeloid markers such as myeloperoxidase, Mac1, and Gr1. Although most leukemias were acute myeloid leukemia, many showed lymphoid features, such as CD3 staining, or clonal Tcrb or Igh gene rearrangements. Mice were clinically healthy for the first 9 months of life and had normal peripheral blood hemograms but showed impaired thymocyte differentiation, manifested by decreased CD4(+)/CD8(+) cells and increased immature CD4(-)/CD8(-) cells in the thymus. Hematopoietic tissues from both clinically healthy and leukemic CALM-AF10 mice showed up-regulation of Hoxa cluster genes, suggesting a potential mechanism for the impaired differentiation. The long latency period and incomplete penetrance suggest that additional genetic events are needed to complement the CALM-AF10 transgene and complete the process of leukemic transformation.
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Affiliation(s)
- David Caudell
- Genetics Branch, National Cancer Institute, National Institutes for Health, Bethesda, MD
- Comparative Molecular Pathology Unit, National Cancer Institute, National Institutes for Health, Bethesda, MD
- Department of Veterinary Medical Sciences, University of Maryland, College Park, MD
| | - Zhenhua Zhang
- Genetics Branch, National Cancer Institute, National Institutes for Health, Bethesda, MD
| | - Yang Jo Chung
- Genetics Branch, National Cancer Institute, National Institutes for Health, Bethesda, MD
| | - Peter D. Aplan
- Genetics Branch, National Cancer Institute, National Institutes for Health, Bethesda, MD
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43
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Rawat VPS, Thoene S, Naidu VM, Arseni N, Heilmeier B, Metzeler K, Petropoulos K, Deshpande A, Quintanilla-Martinez L, Bohlander SK, Spiekermann K, Hiddemann W, Feuring-Buske M, Buske C. Overexpression of CDX2 perturbs HOX gene expression in murine progenitors depending on its N-terminal domain and is closely correlated with deregulated HOX gene expression in human acute myeloid leukemia. Blood 2007; 111:309-19. [PMID: 17855634 DOI: 10.1182/blood-2007-04-085407] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The mechanisms underlying deregulation of HOX gene expression in AML are poorly understood. The ParaHox gene CDX2 was shown to act as positive upstream regulator of several HOX genes. In this study, constitutive expression of Cdx2 caused perturbation of leukemogenic Hox genes such as Hoxa10 and Hoxb8 in murine hematopoietic progenitors. Deletion of the N-terminal domain of Cdx2 abrogated its ability to perturb Hox gene expression and to cause acute myeloid leukemia (AML) in mice. In contrast inactivation of the putative Pbx interacting site of Cdx2 did not change the leukemogenic potential of the gene. In an analysis of 115 patients with AML, expression levels of CDX2 were closely correlated with deregulated HOX gene expression. Patients with normal karyotype showed a 14-fold higher expression of CDX2 and deregulated HOX gene expression compared with patients with chromosomal translocations such as t(8:21) or t(15;17). All patients with AML with normal karyotype tested were negative for CDX1 and CDX4 expression. These data link the leukemogenic potential of Cdx2 to its ability to dysregulate Hox genes. They furthermore correlate the level of CDX2 expression with HOX gene expression in human AML and support a potential role of CDX2 in the development of human AML with aberrant Hox gene expression.
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44
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Wang H, Lu Y, Huang W, Papoutsakis ET, Fuhrken P, Eklund EA. HoxA10 activates transcription of the gene encoding mitogen-activated protein kinase phosphatase 2 (Mkp2) in myeloid cells. J Biol Chem 2007; 282:16164-76. [PMID: 17430893 DOI: 10.1074/jbc.m610556200] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
HoxA10 is a homeodomain transcription factor that is frequently overexpressed in human acute myeloid leukemia. In murine bone marrow transplantation studies, HoxA10 overexpression induces a myeloproliferative disorder with accumulation of mature phagocytes in the peripheral blood and tissues. Over time, differentiation block develops in these animals, resulting in acute myeloid leukemia. In immature myeloid cells, HoxA10 represses transcription of some genes that confer the mature phagocyte phenotype. Therefore, overexpressed HoxA10 blocks differentiation by repressing myeloid-specific gene transcription in differentiating myeloid cells. In contrast, target genes involved in myeloproliferation due to HoxA10 overexpression have not been identified. To identify such genes, we screened a CpG island microarray with HoxA10 co-immunoprecipitating chromatin. We identified the DUSP4 gene, which encodes mitogen-activated protein kinase phosphatase 2 (Mkp2), as a HoxA10 target gene. We analyzed the DUSP4 5'-flank and identified two proximal-promoter cis elements that are activated by HoxA10. We find that DUSP4 transcription and Mkp2 expression decrease during normal myelopoiesis. However, this down-regulation is impaired in myeloid cells overexpressing HoxA10. In hematopoietic cells, c-Jun N-terminal kinases (Jnk) are the preferred substrates for Mkp2. Therefore, Mkp2 inhibits apoptosis by dephosphorylating (inactivating) Jnk. Consistent with this, HoxA10 overexpression decreases apoptosis in differentiating myeloid cells. Therefore, our studies identify a mechanism by which overexpressed HoxA10 contributes to inappropriate cell survival during myelopoiesis.
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Affiliation(s)
- Hao Wang
- Fineberg School of Medicine and the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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45
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Abstract
PURPOSE OF REVIEW The Hox family of homeodomain transcription factors plays an important role in regulating definitive hematopoiesis. Recent studies indicate that a common characteristic of poor prognosis acute myeloid leukemia is dysregulated expression of a key group of these Hox proteins. The purpose of this review is to outline recent progress in understanding the role that dysregulation of HOX-gene expression plays in the pathogenesis of myeloid leukemogenesis. RECENT FINDINGS A number of recent studies correlate increased expression of HOXA-genes with poor prognosis cytogenetics in acute myeloid leukemia and mixed lineage leukemia. These studies determine that specific ABD HOXA-genes (HoxA7, 9 and 10) are dysregulated as a group. Many such studies also document co-overexpression of homeodomain proteins of the Meis and Pbx families in poor prognosis leukemia. This is of interest, since Meis and Pbx proteins are common DNA-binding partners for Hox proteins. SUMMARY These findings suggest that a key characteristic of poor prognosis acute myeloid leukemia is increased, differentiation-stage inappropriate expression of the Abd HoxA proteins and their DNA-binding partners. Such results suggest that dysregulation of the 'Hox code' is important in the pathogenesis of myeloid malignancy.
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Affiliation(s)
- Elizabeth A Eklund
- The Feinberg School at Northwestern University and Jesse Brown VHA Medical Center, Chicago, Illinois 60611, USA.
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46
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Magnusson M, Brun ACM, Miyake N, Larsson J, Ehinger M, Bjornsson JM, Wutz A, Sigvardsson M, Karlsson S. HOXA10 is a critical regulator for hematopoietic stem cells and erythroid/megakaryocyte development. Blood 2007; 109:3687-96. [PMID: 17234739 DOI: 10.1182/blood-2006-10-054676] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
AbstractThe Homeobox (Hox) transcription factors are important regulators of normal and malignant hematopoiesis because they control proliferation, differentiation, and self-renewal of hematopoietic cells at different levels of the hematopoietic hierarchy. In transgenic mice we show that the expression of HOXA10 is tightly regulated by doxycycline. Intermediate concentrations of HOXA10 induced a 15-fold increase in the repopulating capacity of hematopoietic stem cells (HSCs) after 13 days of in vitro culture. Notably, the proliferation induction of HSC by HOXA10 was dependent on the HOXA10 concentration, because high levels of HOXA10 had no effect on HSC proliferation. Furthermore, high levels of HOXA10 blocked erythroid and megakaryocyte development, demonstrating that tight regulation of HOXA10 is critical for normal development of the erythroid and megakaryocytic lineages. The HOXA10-mediated effects on hematopoietic cells were associated with altered expression of genes that govern stem-cell self-renewal and lineage commitment (eg, hepatic leukemia factor [HlF], Dickkopf-1 [Dkk-1], growth factor independent-1 [Gfi-1], and Gata-1). Interestingly, binding sites for HOXA10 were found in HLF, Dkk-1, and Gata-1, and Dkk-1 and Gfi-1 were transcriptionally activated by HOXA10. These findings reveal novel molecular pathways that act downstream of HOXA10 and identify HOXA10 as a master regulator of postnatal hematopoietic development.
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Affiliation(s)
- Mattias Magnusson
- Molecular Medicine and Gene Therapy, Institute of Laboratory Medicine, Lund University Hospital, 221 84 Lund, Sweden
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47
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Abstract
PURPOSE OF REVIEW Homeodomain proteins of the Hox family play an important role in regulation of normal hematopoiesis. Substantial evidence also indicates that abnormal Hox protein expression is functionally significant in the pathogenesis of acute myeloid malignancies. The purpose of this review is to outline recent progress in understanding molecular mechanisms involved in Hox regulation of myelopoiesis and myeloid leukemogenesis. RECENT FINDINGS Since Hox proteins function as transcription factors, recent studies have focused on identifying Hox target genes. Various approaches to this problem have been taken, including high throughput screening techniques. In these studies, expression profiles of hematopoietic cells overexpressing various Hox proteins have been analyzed to obtain initial information about potential target genes. Identification of common and unique sets of target genes for various Hox proteins will shed light on function and regulation of the Hox code in developing hematopoietic cells. SUMMARY Recent studies have generated some intriguing information about potential Hox target genes involved in myelopoiesis and leukemogenesis. A number of issues regarding Hox protein function are unresolved, however. These issues include determining whether the effects of various Hox proteins are redundant versus antagonistic, identifying mechanisms which regulate Hox protein function and mechanisms by which Hox proteins modulate target gene transcription in a context-dependent manner.
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Affiliation(s)
- Elizabeth A Eklund
- The Feinberg School of Medicine, Northwestern University and Jesse Brown VHA Medical Center, 710 N. Fairbanks Court, Chicago, IL 60611, USA.
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48
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Kennedy JA, Barabé F, Patterson BJ, Bayani J, Squire JA, Barber DL, Dick JE. Expression of TEL-JAK2 in primary human hematopoietic cells drives erythropoietin-independent erythropoiesis and induces myelofibrosis in vivo. Proc Natl Acad Sci U S A 2006; 103:16930-5. [PMID: 17077140 PMCID: PMC1629449 DOI: 10.1073/pnas.0604902103] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Activation of JAK2 by chromosomal translocation or point mutation is a recurrent event in hematopoietic malignancies, including acute leukemias and myeloproliferative disorders. Although the effects of activated JAK2 signaling have been examined in cell lines and murine models, the functional consequences of deregulated JAK2 in the context of human hematopoietic cells are currently unknown. Here we report that expression of TEL-JAK2, a constitutively active variant of the JAK2 kinase, in lineage-depleted human umbilical cord blood cells results in erythropoietin-independent erythroid differentiation in vitro and induces the rapid development of myelofibrosis in an in vivo NOD/SCID xenotransplantation assay. These studies provide functional evidence that activated JAK2 signaling in primitive human hematopoietic cells is sufficient to drive key processes implicated in the pathophysiology of polycythemia vera and idiopathic myelofibrosis. Furthermore, they describe an in vivo model of myelofibrosis initiated with primary cells, highlighting the utility of the NOD/SCID xenotransplant system for the development of experimental models of human hematopoietic malignancies.
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Affiliation(s)
- J. A. Kennedy
- Division of Cell and Molecular Biology and
- Departments of Molecular and Medical Genetics and
| | - F. Barabé
- Division of Cell and Molecular Biology and
| | - B. J. Patterson
- Department of Pathology, University Health Network, Toronto, ON, Canada M5G 1L7
| | - J. Bayani
- Medical Biophysics, University of Toronto, Toronto, ON, Canada M5S 1A8; and
- Divisions of Applied Molecular Oncology and
| | - J. A. Squire
- Medical Biophysics, University of Toronto, Toronto, ON, Canada M5S 1A8; and
- Divisions of Applied Molecular Oncology and
| | - D. L. Barber
- Medical Biophysics, University of Toronto, Toronto, ON, Canada M5S 1A8; and
- Stem Cell and Developmental Biology, Ontario Cancer Institute, Toronto, ON, Canada M5G 2M9
| | - J. E. Dick
- Division of Cell and Molecular Biology and
- Departments of Molecular and Medical Genetics and
- To whom correspondence should be addressed. E-mail:
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49
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Toren A, Bielorai B, Jacob-Hirsch J, Fisher T, Kreiser D, Moran O, Zeligson S, Givol D, Yitzhaky A, Itskovitz-Eldor J, Kventsel I, Rosenthal E, Amariglio N, Rechavi G. CD133-positive hematopoietic stem cell "stemness" genes contain many genes mutated or abnormally expressed in leukemia. Stem Cells 2006; 23:1142-53. [PMID: 16140871 DOI: 10.1634/stemcells.2004-0317] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Affymetrix human Hu133A oligonucleotide arrays were used to study the expression profile of CD133+ cord blood (CB) and peripheral blood (PB) using CD133 cell-surface marker. An unsupervised hierarchical clustering of 14,025 valid probe sets showed a clear distinction between the CD133+ cells representing the hematopoietic stem cell (HSC) population and CD133-differentiated cells. Two hundred forty-four genes were found to be upregulated by at least twofold in the CD133-positive cells of both CB and PB compared with the CD133-negative cells. These genes represent the hematopoietic "stemness," whereas the 218 and 304 upregulated genes exclusively in PB and CB, respectively, represent tissue specificity. Some of the stemness genes were also common to HSC genes found to be upregulated in several recently published studies. Among these common stemness genes, we identified several groups of genes that have an important role in hematopoiesis: growth factor receptors, transcription factors, genes that have an important role in development, and genes involved in cell growth. Sixteen selected stemness genes are known to be mutated or abnormally regulated in acute leukemias. It can be suggested that key hematopoietic stemness machinery genes may lead to abnormal proliferation and leukemia upon mutation or change of their expression.
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Affiliation(s)
- Amos Toren
- Department of Pediatric Hematology-Oncology, Sheba Medical Center,
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50
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Dorrance AM, Liu S, Yuan W, Becknell B, Arnoczky KJ, Guimond M, Strout MP, Feng L, Nakamura T, Yu L, Rush LJ, Weinstein M, Leone G, Wu L, Ferketich A, Whitman SP, Marcucci G, Caligiuri MA. Mll partial tandem duplication induces aberrant Hox expression in vivo via specific epigenetic alterations. J Clin Invest 2006; 116:2707-16. [PMID: 16981007 PMCID: PMC1564428 DOI: 10.1172/jci25546] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2005] [Accepted: 07/25/2006] [Indexed: 01/14/2023] Open
Abstract
We previously identified a rearrangement of mixed-lineage leukemia (MLL) gene (also known as ALL-1, HRX, and HTRX1), consisting of an in-frame partial tandem duplication (PTD) of exons 5 through 11 in the absence of a partner gene, occurring in approximately 4%-7% of patients with acute myeloid leukemia (AML) and normal cytogenetics, and associated with a poor prognosis. The mechanism by which the MLL PTD contributes to aberrant hematopoiesis and/or leukemia is unknown. To examine this, we generated a mouse knockin model in which exons 5 through 11 of the murine Mll gene were targeted to intron 4 of the endogenous Mll locus. Mll(PTD/WT) mice exhibit an alteration in the boundaries of normal homeobox (Hox) gene expression during embryogenesis, resulting in axial skeletal defects and increased numbers of hematopoietic progenitor cells. Mll(PTD/WT) mice overexpress Hoxa7, Hoxa9, and Hoxa10 in spleen, BM, and blood. An increase in histone H3/H4 acetylation and histone H3 lysine 4 (Lys4) methylation within the Hoxa7 and Hoxa9 promoters provides an epigenetic mechanism by which this overexpression occurs in vivo and an etiologic role for MLL PTD gain of function in the genesis of AML.
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Affiliation(s)
- Adrienne M. Dorrance
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Shujun Liu
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Weifeng Yuan
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Brian Becknell
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Kristy J. Arnoczky
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Martin Guimond
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Matthew P. Strout
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Lan Feng
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Tatsuya Nakamura
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Li Yu
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Laura J. Rush
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Michael Weinstein
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Gustavo Leone
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Lizhao Wu
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Amy Ferketich
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Susan P. Whitman
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Guido Marcucci
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
| | - Michael A. Caligiuri
- Department of Internal Medicine, Division of Hematology and Oncology,
Department of Veterinary Biosciences,
Integrated Biomedical Science Graduate Program,
Department of Molecular Virology, Immunology and Medical Genetics,
Comprehensive Cancer Center,
Department of Molecular Genetics, and
Division of Biometrics, The Ohio State University, Columbus, Ohio, USA
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