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Stempel ZD, Radomska HS, Coss CC, Micalizio GC. Function-Oriented Synthesis of Pentacyclic Triterpenoids and Discovery of an ent-Estrane as a Natural Product-Inspired Androgen Receptor Antagonist. Org Lett 2024; 26:3054-3059. [PMID: 38557107 DOI: 10.1021/acs.orglett.4c00697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
While pentacyclic triterpenoids have a rich history in chemistry and biology, the challenges associated with their asymmetric synthesis contribute to the current reality that medicinal exploration in the area is largely constrained to natural product derivatization. To address this deficiency, a function-oriented synthesis of pentacyclic triterpenoids was pursued. Overall, we report a divergent synthesis of 26-norgermanicol and 26-norlupeol and we have identified a new class of androgen receptor antagonist that is ∼6× more potent than lupeol.
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Affiliation(s)
- Zachary D Stempel
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Hanna S Radomska
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Christopher C Coss
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Glenn C Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
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2
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Canella A, Nieves HC, Sborov DW, Cascione L, Radomska HS, Smith E, Stiff A, Consiglio J, Caserta E, Rizzotto L, Zanesi N, Stefano V, Kaur B, Mo X, Byrd JC, Efebera YA, Hofmeister CC, Pichiorri F. Correction: HDAC inhibitor AR-42 decreases CD44 expression and sensitizes myeloma cells to lenalidomide. Oncotarget 2023; 14:837-838. [PMID: 37747363 PMCID: PMC10519243 DOI: 10.18632/oncotarget.28515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023] Open
Affiliation(s)
- Alessandro Canella
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- These authors have contributed equally to this work
| | - Hector Cordero Nieves
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- These authors have contributed equally to this work
| | - Douglas W. Sborov
- Department of Internal Medicine, Oncology/Hematology Fellowship, The Ohio State University, Columbus, OH, USA
| | - Luciano Cascione
- Lymphoma and Genomics Research Program, IOR Institute of Oncology Research, Bellinzona, Switzerland
| | - Hanna S. Radomska
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Emily Smith
- Department of Internal Medicine, Biomedical Sciences Graduate Program, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Andrew Stiff
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Jessica Consiglio
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Present Address: Sanford Burnham Prebys Medical Discovery Insitute, La Jolla, CA, USA
| | - Enrico Caserta
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Lara Rizzotto
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Nicola Zanesi
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Volinia Stefano
- Department of Internal Medicine, Biosystems Analysis, LTTA, Department of Morphology, Surgery and Experimental Medicine, Università degli Studi, Ferrara, Italy
| | - Balveen Kaur
- Department of Neurological Surgery, Dardinger Laboratory for Neuro-oncology and Neurosciences, The Ohio State University Medical Center, Columbus, Ohio, USA
| | - Xiaokui Mo
- Department of Biomedical Informatics, Center for Biostatistics, The Ohio State University, Columbus, OH, USA
| | - John C. Byrd
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
| | - Yvonne A. Efebera
- Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
| | - Craig C. Hofmeister
- Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
| | - Flavia Pichiorri
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
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3
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Datta J, Willingham N, Manouchehri JM, Schnell P, Sheth M, David JJ, Kassem M, Wilson TA, Radomska HS, Coss CC, Bennett CE, Ganju RK, Sardesai SD, Lustberg M, Ramaswamy B, Stover DG, Cherian MA. Activity of Estrogen Receptor β Agonists in Therapy-Resistant Estrogen Receptor-Positive Breast Cancer. Front Oncol 2022; 12:857590. [PMID: 35574319 PMCID: PMC9097292 DOI: 10.3389/fonc.2022.857590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/28/2022] [Indexed: 11/14/2022] Open
Abstract
Background Among women, breast cancer is the leading cause of cancer-related death worldwide. Estrogen receptor α-positive (ERα+) breast cancer accounts for 70% of all breast cancer subtypes. Although ERα+ breast cancer initially responds to estrogen deprivation or blockade, the emergence of resistance compels the use of more aggressive therapies. While ERα is a driver in ERα+ breast cancer, ERβ plays an inhibitory role in several different cancer types. To date, the lack of highly selective ERβ agonists without ERα activity has limited the exploration of ERβ activation as a strategy for ERα+ breast cancer. Methods We measured the expression levels of ESR1 and ESR2 genes in immortalized mammary epithelial cells and different breast cancer cell lines. The viability of ERα+ breast cancer cell lines upon treatments with specific ERβ agonists, including OSU-ERb-12 and LY500307, was assessed. The specificity of the ERβ agonists, OSU-ERb-12 and LY500307, was confirmed by reporter assays. The effects of ERβ agonists on cell proliferation, cell cycle, apoptosis, colony formation, cell migration, and expression of tumor suppressor proteins were analyzed. The expression of ESR2 and genes containing ERE-AP1 composite response elements was examined in ERα+ human breast cancer samples to determine the correlation between ESR2 expression and overall survival and that of putative ESR2-regulated genes. Results In this study, we demonstrate the efficacy of highly selective ERβ agonists in ERα+ breast cancer cell lines and drug-resistant derivatives. ERβ agonists blocked cell proliferation, migration, and colony formation and induced apoptosis and S and/or G2/M cell-cycle arrest of ERα+ breast cancer cell lines. Also, increases in the expression of the key tumor suppressors FOXO1 and FOXO3a were noted. Importantly, the strong synergy between ERβ agonists and ERα antagonists suggested that the efficacy of ERβ agonists is maximized by combination with ERα blockade. Lastly, ESR2 (ERβ gene) expression was negatively correlated with ESR1 (ERα gene) and CCND1 RNA expression in human metastatic ERα+/HER2- breast cancer samples. Conclusion Our results demonstrate that highly selective ERβ agonists attenuate the viability of ERα+ breast cancer cell lines in vitro and suggest that this therapeutic strategy merits further evaluation for ERα+ breast cancer.
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Affiliation(s)
- Jharna Datta
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Natalie Willingham
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Jasmine M. Manouchehri
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Patrick Schnell
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Stefanie Spielman Comprehensive Breast Cancer, The Ohio State University, Columbus, OH, United States
| | - Mirisha Sheth
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Joel J. David
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Mahmoud Kassem
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Stefanie Spielman Comprehensive Breast Cancer, The Ohio State University, Columbus, OH, United States
| | - Tyler A. Wilson
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Medicinal Chemistry Shared Resource, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Hanna S. Radomska
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH, United States
| | - Christopher C. Coss
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, OH, United States
- Drug Development Institute, The Ohio State University, Columbus, OH, United States
| | - Chad E. Bennett
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Medicinal Chemistry Shared Resource, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Drug Development Institute, The Ohio State University, Columbus, OH, United States
| | - Ramesh K. Ganju
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Sagar D. Sardesai
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Stefanie Spielman Comprehensive Breast Cancer, The Ohio State University, Columbus, OH, United States
| | - Maryam Lustberg
- Yale Cancer Center, Yale School of Medicine, New Haven, CT, United States
| | - Bhuvaneswari Ramaswamy
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Stefanie Spielman Comprehensive Breast Cancer, The Ohio State University, Columbus, OH, United States
| | - Daniel G. Stover
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Stefanie Spielman Comprehensive Breast Cancer, The Ohio State University, Columbus, OH, United States
| | - Mathew A. Cherian
- Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Stefanie Spielman Comprehensive Breast Cancer, The Ohio State University, Columbus, OH, United States
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4
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Sedlák D, Wilson TA, Tjarks W, Radomska HS, Wang H, Kolla JN, Leśnikowski ZJ, Špičáková A, Ali T, Ishita K, Rakotondraibe LH, Vibhute S, Wang D, Anzenbacher P, Bennett C, Bartunek P, Coss CC. Structure-Activity Relationship of para-Carborane Selective Estrogen Receptor β Agonists. J Med Chem 2021; 64:9330-9353. [PMID: 34181409 DOI: 10.1021/acs.jmedchem.1c00555] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Selective agonism of the estrogen receptor (ER) subtypes, ERα and ERβ, has historically been difficult to achieve due to the high degree of ligand-binding domain structural similarity. Multiple efforts have focused on the use of classical organic scaffolds to model 17β-estradiol geometry in the design of ERβ selective agonists, with several proceeding to various stages of clinical development. Carborane scaffolds offer many unique advantages including the potential for novel ligand/receptor interactions but remain relatively unexplored. We synthesized a series of para-carborane estrogen receptor agonists revealing an ERβ selective structure-activity relationship. We report ERβ agonists with low nanomolar potency, greater than 200-fold selectivity for ERβ over ERα, limited off-target activity against other nuclear receptors, and only sparse CYP450 inhibition at very high micromolar concentrations. The pharmacological properties of our para-carborane ERβ selective agonists measure favorably against clinically developed ERβ agonists and support further evaluation of carborane-based selective estrogen receptor modulators.
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Affiliation(s)
- David Sedlák
- CZ-OPENSCREEN, Institute of Molecular Genetics of the Czech Academy of Sciences, Vídeňská 1083, 142 20 Prague, Czech Republic
| | - Tyler A Wilson
- Medicinal Chemistry Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United States
| | - Werner Tjarks
- Division of Medicinal Chemistry and Pharmacognosy College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Hanna S Radomska
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Hongyan Wang
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jayaprakash Narayana Kolla
- CZ-OPENSCREEN, Institute of Molecular Genetics of the Czech Academy of Sciences, Vídeňská 1083, 142 20 Prague, Czech Republic
| | - Zbigniew J Leśnikowski
- Laboratory of Medicinal Chemistry, Institute of Medical Biology PAS, 106 Lodowa Street, 93-232 Lodz, Poland
| | - Alena Špičáková
- Department of Pharmacology, Faculty of Medicine, Palacky University, Hněvotínská 3, 77515 Olomouc, Czech Republic
| | - Tehane Ali
- Division of Medicinal Chemistry and Pharmacognosy College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Keisuke Ishita
- Division of Medicinal Chemistry and Pharmacognosy College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Liva Harinantenaina Rakotondraibe
- Division of Medicinal Chemistry and Pharmacognosy College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Sandip Vibhute
- Medicinal Chemistry Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United States
| | - Dasheng Wang
- Medicinal Chemistry Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United States
| | - Pavel Anzenbacher
- Department of Pharmacology, Faculty of Medicine, Palacky University, Hněvotínská 3, 77515 Olomouc, Czech Republic
| | - Chad Bennett
- Medicinal Chemistry Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United States.,Drug Development Institute, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United States
| | - Petr Bartunek
- CZ-OPENSCREEN, Institute of Molecular Genetics of the Czech Academy of Sciences, Vídeňská 1083, 142 20 Prague, Czech Republic
| | - Christopher C Coss
- Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States.,Drug Development Institute, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United States
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5
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Wang H, Radomska HS, Phelps MA. Replication Study: Coding-independent regulation of the tumor suppressor PTEN by competing endogenous mRNAs. eLife 2020; 9:56651. [PMID: 33073769 DOI: 10.7554/elife.56651] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 09/18/2020] [Indexed: 12/19/2022] Open
Abstract
As part of the Reproducibility Project: Cancer Biology, we published a Registered Report (Phelps et al., 2016) that described how we intended to replicate selected experiments from the paper 'Coding-independent regulation of the tumor suppressor PTEN by competing endogenous mRNAs' (Tay et al., 2011). Here, we report the results. We found depletion of putative PTEN competing endogenous mRNAs (ceRNAs) in DU145 cells did not impact PTEN 3'UTR regulation using a reporter, while the original study reported decreased activity when SERINC1, VAPA, and CNOT6L were depleted (Figure 3C; Tay et al., 2011). Using the same reporter, we found decreased activity when ceRNA 3'UTRs were overexpressed, while the original study reported increased activity (Figure 3D; Tay et al., 2011). In HCT116 cells, ceRNA depletion resulted in decreased PTEN protein levels, a result similar to the findings reported in the original study (Figure 3G,H; Tay et al., 2011); however, while the original study reported an attenuated ceRNA effect in microRNA deficient (DicerEx5) HCT116 cells, we observed increased PTEN protein levels. Further, we found depletion of the ceRNAs VAPA or CNOT6L did not statistically impact DU145, wild-type HCT116, or DicerEx5 HCT116 cell proliferation. The original study reported increased DU145 and wild-type HCT116 cell proliferation when these ceRNAs were depleted, which was attenuated in the DicerEx5 HCT116 cells (Figure 5B; Tay et al., 2011). Differences between the original study and this replication attempt, such as variance between biological repeats, are factors that might have influenced the results. Finally, we report meta-analyses for each result.
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Affiliation(s)
- Hongyan Wang
- Pharmacoanalytic Shared Resource (PhASR), Comprehensive Cancer Center, The Ohio State University, Columbus, United States
| | - Hanna S Radomska
- Pharmacoanalytic Shared Resource (PhASR), Comprehensive Cancer Center, The Ohio State University, Columbus, United States
| | - Mitch A Phelps
- Pharmacoanalytic Shared Resource (PhASR), Comprehensive Cancer Center, The Ohio State University, Columbus, United States
| | -
- Science Exchange, Palo Alto, United States.,Center for Open Science, Charlottesville, United States
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6
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Gonzalez D, Luyten A, Bartholdy B, Zhou Q, Kardosova M, Ebralidze A, Swanson KD, Radomska HS, Zhang P, Kobayashi SS, Welner RS, Levantini E, Steidl U, Chong G, Collombet S, Choi MH, Friedman AD, Scott LM, Alberich-Jorda M, Tenen DG. ZNF143 protein is an important regulator of the myeloid transcription factor C/EBPα. J Biol Chem 2017; 292:18924-18936. [PMID: 28900037 DOI: 10.1074/jbc.m117.811109] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Indexed: 12/21/2022] Open
Abstract
The transcription factor C/EBPα is essential for myeloid differentiation and is frequently dysregulated in acute myeloid leukemia. Although studied extensively, the precise regulation of its gene by upstream factors has remained largely elusive. Here, we investigated its transcriptional activation during myeloid differentiation. We identified an evolutionarily conserved octameric sequence, CCCAGCAG, ∼100 bases upstream of the CEBPA transcription start site, and demonstrated through mutational analysis that this sequence is crucial for C/EBPα expression. This sequence is present in the genes encoding C/EBPα in humans, rodents, chickens, and frogs and is also present in the promoters of other C/EBP family members. We identified that ZNF143, the human homolog of the Xenopus transcriptional activator STAF, specifically binds to this 8-bp sequence to activate C/EBPα expression in myeloid cells through a mechanism that is distinct from that observed in liver cells and adipocytes. Altogether, our data suggest that ZNF143 plays an important role in the expression of C/EBPα in myeloid cells.
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Affiliation(s)
- David Gonzalez
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore.,the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115
| | - Annouck Luyten
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore
| | - Boris Bartholdy
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115
| | - Qiling Zhou
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore
| | - Miroslava Kardosova
- the Institute of Molecular Genetics of the ASCR, Prague 142 20, Czech Republic.,the Childhood Leukaemia Investigation Prague, Second Faculty of Medicine Charles University, University Hospital Motol, Prague 150 06, Czech Republic
| | - Alex Ebralidze
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115
| | - Kenneth D Swanson
- the Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02115
| | - Hanna S Radomska
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115.,The Ohio State University, Comprehensive Cancer Center, Columbus, Ohio 43210, and
| | - Pu Zhang
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115
| | - Susumu S Kobayashi
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115.,the Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02115
| | - Robert S Welner
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115.,the Hematology/Oncology Department, University of Alabama at Birmingham, Birmingham, Alabama 35294
| | - Elena Levantini
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115.,the Institute of Biomedical Technologies, National Research Council, 56124 Pisa, Italy
| | - Ulrich Steidl
- the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115.,the Department of Cell Biology, and Department of Medicine (Oncology), Albert Einstein College of Medicine, New York, New York 10461
| | - Gilbert Chong
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore
| | - Samuel Collombet
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore
| | - Min Hee Choi
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore
| | | | - Linda M Scott
- the The University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland 4102, Australia
| | - Meritxell Alberich-Jorda
- the Institute of Molecular Genetics of the ASCR, Prague 142 20, Czech Republic, .,the Childhood Leukaemia Investigation Prague, Second Faculty of Medicine Charles University, University Hospital Motol, Prague 150 06, Czech Republic
| | - Daniel G Tenen
- From the Cancer Science Institute, National University of Singapore, 117599 Singapore, .,the Harvard Stem Cell Institute, Harvard Medical School, Boston, Massachusetts 02115
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7
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Canella A, Cordero Nieves H, Sborov DW, Cascione L, Radomska HS, Smith E, Stiff A, Consiglio J, Caserta E, Rizzotto L, Zanesi N, Stefano V, Kaur B, Mo X, Byrd JC, Efebera YA, Hofmeister CC, Pichiorri F. HDAC inhibitor AR-42 decreases CD44 expression and sensitizes myeloma cells to lenalidomide. Oncotarget 2016; 6:31134-50. [PMID: 26429859 PMCID: PMC4741593 DOI: 10.18632/oncotarget.5290] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 09/14/2015] [Indexed: 12/25/2022] Open
Abstract
Multiple myeloma (MM) is a hematological malignancy of plasma cells in the bone marrow. Despite multiple treatment options, MM is inevitably associated with drug resistance and poor outcomes. Histone deacetylase inhibitors (HDACi's) are promising novel chemotherapeutics undergoing evaluation in clinical trials for the potential treatment of patients with MM. Although in preclinical studies HDACi's have proven anti-myeloma activity, but in the clinic single-agent HDACi treatments have been limited due to low tolerability. Improved clinical outcomes were reported only when HDACi's were combined with other drugs. Here, we show that a novel pan-HDACi AR-42 downregulates CD44, a glycoprotein that has been associated with lenalidomide and dexamethasone resistance in myeloma both in vitro and in vivo. We also show that this CD44 downregulation is in part mediated by miR-9–5p, targeting insulin-like growth factor 2 mRNA binding protein 3 (IGF2BP3), which directly binds to CD44 mRNA and increases its stability. Importantly, we also demonstrate that AR-42 enhances anti-myeloma activity of lenalidomide in primary MM cells isolated from lenalidomide resistant patients and in in vivo MM mouse model. Thus, our findings shed light on potential novel combinatorial therapeutic approaches modulating CD44 expression, which may help overcome lenalidomide resistance in myeloma patients.
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Affiliation(s)
- Alessandro Canella
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Hector Cordero Nieves
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Douglas W Sborov
- Department of Internal Medicine, Oncology/Hematology Fellowship, The Ohio State University, Columbus, OH, USA
| | - Luciano Cascione
- Lymphoma & Genomics Research Program, IOR Institute of Oncology Research, Bellinzona, Switzerland
| | - Hanna S Radomska
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Emily Smith
- Department of Internal Medicine, Biomedical Sciences Graduate Program, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Andrew Stiff
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Jessica Consiglio
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA.,Present Address: Sanford Burnham Prebys Medical Discovery Insitute, La Jolla, CA, USA
| | - Enrico Caserta
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Lara Rizzotto
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Nicola Zanesi
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Volinia Stefano
- Department of Internal Medicine, Biosystems Analysis, LTTA, Department of Morphology, Surgery and Experimental Medicine, Università degli Studi, Ferrara, Italy
| | - Balveen Kaur
- Department of Neurological Surgery, Dardinger Laboratory for Neuro-oncology and Neurosciences, The Ohio State University Medical Center, Columbus, Ohio, USA
| | - Xiaokui Mo
- Department of Biomedical Informatics, Center for Biostatistics, The Ohio State University, Columbus, OH, USA
| | - John C Byrd
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA.,Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
| | - Yvonne A Efebera
- Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
| | - Craig C Hofmeister
- Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
| | - Flavia Pichiorri
- Department of Internal Medicine, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA.,Department of Internal Medicine, Division of Hematology, The Ohio State University, Columbus, OH, USA
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8
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Canella A, Harshman SW, Radomska HS, Freitas MA, Pichiorri F. The potential diagnostic power of extracellular vesicle analysis for multiple myeloma. Expert Rev Mol Diagn 2016; 16:277-84. [PMID: 26671731 DOI: 10.1586/14737159.2016.1132627] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Multiple myeloma (MM) is a hematologic malignancy of plasma cells (PCs). In the United States, MM accounts for approximately 1% of all diagnoses and 2% of all cancer-related deaths. Although MM is a treatable disease, most patients eventually relapse, and despite the development of numerous treatment options it is still considered incurable. Mechanisms of communication between MM-PCs and bone marrow microenvironment, including cell-cell contacts and release of pro-survival factors, promote cancer cell survival and drug resistance. Recently, the importance of extracellular vesicles (EVs) as mechanisms of communication between MM cells and other cells in the microenvironment has been reported. In this review, the authors provide the update on the biology and clinical aspects of EVs in MM.
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Affiliation(s)
- Alessandro Canella
- a Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA
| | - Sean W Harshman
- a Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA.,b Department of Molecular Virology, Immunology and Medical Genetics , The Ohio State University , Columbus , OH , USA
| | - Hanna S Radomska
- a Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA
| | - Michael A Freitas
- a Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA.,b Department of Molecular Virology, Immunology and Medical Genetics , The Ohio State University , Columbus , OH , USA
| | - Flavia Pichiorri
- c Department of Internal Medicine, Division of Hematology , The Ohio State University , Columbus , OH , USA
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9
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Jendrzejewski J, Thomas A, Liyanarachchi S, Eiterman A, Tomsic J, He H, Radomska HS, Li W, Nagy R, Sworczak K, de la Chapelle A. PTCSC3 Is Involved in Papillary Thyroid Carcinoma Development by Modulating S100A4 Gene Expression. J Clin Endocrinol Metab 2015; 100:E1370-7. [PMID: 26274343 PMCID: PMC4596031 DOI: 10.1210/jc.2015-2247] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
CONTEXT We previously showed that a long noncoding RNA gene, PTCSC3, located close to the variant rs944289 that predisposes to papillary thyroid carcinoma (PTC) might target the S100A4 gene. OBJECTIVE The aim was to investigate the impact of PTCSC3 on S100A4 expression and its role in cancer development. DESIGN S100A4 abundance was analyzed by quantitative PCR (qPCR) in unaffected and tumor tissue from n = 73 PTC patients. The expression of PTCSC3 and S100A4 was studied in BCPAP and TPC-1 cell lines with forced expression of PTCSC3 by qPCR. Expression of S100A4 target genes (VEGF and MMP-9) was studied in the BCPAP cell line with forced expression of PTCSC3 by qPCR, reverse transcriptase PCR, and Western blot. The impact of PTCSC3 on BCPAP motility and invasiveness was analyzed by the Transwell and Matrigel assays, respectively. SETTING This was a laboratory-based study using cells from clinical samples and thyroid cancer cell lines. MAIN OUTCOME AND MEASURE We aimed to find evidence for a link between the expression of PTCSC3 and thyroid carcinogenesis. RESULTS Expression data from PTC cell lines pinpointed S100A4 as the most significantly downregulated gene in the presence of PTCSC3. S100A4 was upregulated in tumor tissue (P = 9.33 × 10(-7)) while PTCSC3 was strongly downregulated (P = 2.2 × 10(-16)). S100A4 transcription was moderately correlated with PTCSC3 expression in unaffected thyroid tissue (r = 0.429, P = .0001), and strongly in unaffected tissue of patients with the risk allele of rs944289 (r = 0.685, P = 7.88 × 10(-5)). S100A4, VEGF, and MMP-9 were suppressed in the presence of PTCSC3 (P = .0051, P = .0090, and P =.0037, respectively). PTC cells expressing PTCSC3 showed reduction in motility and invasiveness (P = 4.52 × 10(-5) and P = 1.0 × 10(-4), respectively). CONCLUSIONS PTCSC3 downregulates S100A4, leading to a reduction in cell motility and invasiveness. We propose that PTCSC3 impacts PTC predisposition and carcinogenesis through the S100A4 pathway.
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Affiliation(s)
- Jaroslaw Jendrzejewski
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Andrew Thomas
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Sandya Liyanarachchi
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Andrew Eiterman
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Jerneja Tomsic
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Huiling He
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Hanna S Radomska
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Wei Li
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Rebecca Nagy
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Krzysztof Sworczak
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
| | - Albert de la Chapelle
- Human Cancer Genetics Program, Comprehensive Cancer Center (J.J., A.T., S.L., A.E., J.T., H.H., H.S.R., W.L., R.N., A.d.l.C.), The Ohio State University, Columbus, Ohio, 43210; and Department of Endocrinology and Internal Medicine (J.J., K.S.), Medical University of Gdansk, Poland
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Radomska HS, Jernigan F, Nakayama S, Jorge SE, Sun L, Tenen DG, Kobayashi SS. A Cell-Based High-Throughput Screening for Inducers of Myeloid Differentiation. ACTA ACUST UNITED AC 2015; 20:1150-9. [PMID: 26109609 DOI: 10.1177/1087057115592220] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 05/29/2015] [Indexed: 12/27/2022]
Abstract
Recent progress of genetic studies has dramatically unveiled pathogenesis of acute myeloid leukemia (AML). However, overall survival of AML still remains unsatisfactory, and development of novel therapeutics is required. CCAAT/enhancer binding protein α (C/EBPα) is one of the crucial transcription factors that induce granulocytic differentiation, and its activity is perturbed in human myeloid leukemias. As its reexpression can induce differentiation and subsequent apoptosis of leukemic cells in vitro, we hypothesized that chemical compounds that restore C/EBPα expression and/or activity would lead to myeloid differentiation of leukemic cells. Using a cell-based high-throughput screening, we identified 2-[(E)-2-(3,4-dihydroxyphenyl)vinyl]-3-(2-methoxyphenyl)-4(3H)-quinazolinone as a potent inducer of C/EBPα and myeloid differentiation. Leukemia cell lines and primary blast cells isolated from human patients with AML treated with ICCB280 demonstrated evidence of morphological and functional differentiation, as well as massive apoptosis. We performed conformational analyses of the high-throughput screening hit compounds to postulate the spatial requirements for high potency. Our results warrant a development of novel differentiation therapies and significantly affect care of patients with AML with unfavorable prognosis in the near future.
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Affiliation(s)
- Hanna S Radomska
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA Comprehensive Cancer Center, The Ohio State University Medical Center, Columbus, OH, USA
| | - Finith Jernigan
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Sohei Nakayama
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Susan E Jorge
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Lijun Sun
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Daniel G Tenen
- Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA Cancer Science Institute, National University of Singapore, Singapore
| | - Susumu S Kobayashi
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA
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11
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Khalife J, Radomska HS, Santhanam R, Huang X, Neviani P, Saultz J, Wang H, Wu YZ, Alachkar H, Anghelina M, Dorrance A, Curfman J, Bloomfield CD, Medeiros BC, Perrotti D, Lee LJ, Lee RJ, Caligiuri MA, Pichiorri F, Croce CM, Garzon R, Guzman ML, Mendler JH, Marcucci G. Pharmacological targeting of miR-155 via the NEDD8-activating enzyme inhibitor MLN4924 (Pevonedistat) in FLT3-ITD acute myeloid leukemia. Leukemia 2015; 29:1981-92. [PMID: 25971362 DOI: 10.1038/leu.2015.106] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 02/17/2015] [Accepted: 04/09/2015] [Indexed: 12/20/2022]
Abstract
High levels of microRNA-155 (miR-155) are associated with poor outcome in acute myeloid leukemia (AML). In AML, miR-155 is regulated by NF-κB, the activity of which is, in part, controlled by the NEDD8-dependent ubiquitin ligases. We demonstrate that MLN4924, an inhibitor of NEDD8-activating enzyme presently being evaluated in clinical trials, decreases binding of NF-κB to the miR-155 promoter and downregulates miR-155 in AML cells. This results in the upregulation of the miR-155 targets SHIP1, an inhibitor of the PI3K/Akt pathway, and PU.1, a transcription factor important for myeloid differentiation, leading to monocytic differentiation and apoptosis. Consistent with these results, overexpression of miR-155 diminishes MLN4924-induced antileukemic effects. In vivo, MLN4924 reduces miR-155 expression and prolongs the survival of mice engrafted with leukemic cells. Our study demonstrates the potential of miR-155 as a novel therapeutic target in AML via pharmacologic interference with NF-κB-dependent regulatory mechanisms. We show the targeting of this oncogenic microRNA with MLN4924, a compound presently being evaluated in clinical trials in AML. As high miR-155 levels have been consistently associated with aggressive clinical phenotypes, our work opens new avenues for microRNA-targeting therapeutic approaches to leukemia and cancer patients.
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Affiliation(s)
- J Khalife
- Program of Molecular, Cellular, and Developmental Biology, The Ohio State University, Columbus, OH, USA
| | - H S Radomska
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - R Santhanam
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - X Huang
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - P Neviani
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - J Saultz
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - H Wang
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - Y-Z Wu
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - H Alachkar
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - M Anghelina
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - A Dorrance
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - J Curfman
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - C D Bloomfield
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - B C Medeiros
- Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - D Perrotti
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - L J Lee
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA.,Nanoscale Science and Engineering Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, Columbus, OH, USA
| | - R J Lee
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA.,Division of Pharmaceutics, College of Pharmacy, The Ohio State University, Columbus, OH, USA
| | - M A Caligiuri
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - F Pichiorri
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - C M Croce
- Department of Molecular Virology, Immunology and Cancer Genetics, The Ohio State University and The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - R Garzon
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, USA
| | - M L Guzman
- Division of Hematology & Medical Oncology, Department of Medicine, Weill Cornell Medical College, New York, NY, USA
| | - J H Mendler
- James P. Wilmot Cancer Center and Department of Medicine, University of Rochester, Rochester, NY, USA
| | - G Marcucci
- Division of Hematopoietic Stem Cell & Leukemia Research, Department of Hematology & HCT, Gehr Family Center for Leukemia, City of Hope Comprehensive Cancer Center, Duarte, CA, USA
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12
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Liss A, Ooi CH, Zjablovskaja P, Benoukraf T, Radomska HS, Ju C, Wu M, Balastik M, Delwel R, Brdicka T, Tan P, Tenen DG, Alberich-Jorda M. The gene signature in CCAAT-enhancer-binding protein α dysfunctional acute myeloid leukemia predicts responsiveness to histone deacetylase inhibitors. Haematologica 2013; 99:697-705. [PMID: 24162792 DOI: 10.3324/haematol.2013.093278] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
C/EPBα proteins, encoded by the CCAAT-enhancer-binding protein α gene, play a crucial role in granulocytic development, and defects in this transcription factor have been reported in acute myeloid leukemia. Here, we defined the C/EBPα signature characterized by a set of genes up-regulated upon C/EBPα activation. We analyzed expression of the C/EBPα signature in a cohort of 525 patients with acute myeloid leukemia and identified a subset characterized by low expression of this signature. We referred to this group of patients as the C/EBPα dysfunctional subset. Remarkably, a large percentage of samples harboring C/EBPα biallelic mutations clustered within this subset. We hypothesize that re-activation of the C/EBPα signature in the C/EBPα dysfunctional subset could have therapeutic potential. In search for small molecules able to reverse the low expression of the C/EBPα signature we applied the connectivity map. This analysis predicted positive connectivity between the C/EBPα activation signature and histone deacetylase inhibitors. We showed that these inhibitors reactivate expression of the C/EBPα signature and promote granulocytic differentiation of primary samples from the C/EBPα dysfunctional subset harboring biallelic C/EBPα mutations. Altogether, our study identifies histone deacetylase inhibitors as potential candidates for the treatment of certain leukemias characterized by down-regulation of the C/EBPα signature.
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13
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Alberich-Jordà M, Wouters B, Balastik M, Shapiro-Koss C, Zhang H, Di Ruscio A, Radomska HS, Ebralidze AK, Amabile G, Ye M, Zhang J, Lowers I, Avellino R, Melnick A, Figueroa ME, Valk PJ, Delwel R, Tenen DG. C/EBPγ deregulation results in differentiation arrest in acute myeloid leukemia. J Clin Invest 2013. [DOI: 10.1172/jci68299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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14
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Alberich-Jordà M, Wouters B, Balastik M, Shapiro-Koss C, Zhang H, Di Ruscio A, DiRuscio A, Radomska HS, Ebralidze AK, Amabile G, Ye M, Zhang J, Lowers I, Avellino R, Melnick A, Figueroa ME, Valk PJM, Delwel R, Tenen DG. C/EBPγ deregulation results in differentiation arrest in acute myeloid leukemia. J Clin Invest 2012; 122:4490-504. [PMID: 23160200 DOI: 10.1172/jci65102] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 09/20/2012] [Indexed: 11/17/2022] Open
Abstract
C/EBPs are a family of transcription factors that regulate growth control and differentiation of various tissues. We found that C/EBPγ is highly upregulated in a subset of acute myeloid leukemia (AML) samples characterized by C/EBPα hypermethylation/silencing. Similarly, C/EBPγ was upregulated in murine hematopoietic stem/progenitor cells lacking C/EBPα, as C/EBPα mediates C/EBPγ suppression. Studies in myeloid cells demonstrated that CEBPG overexpression blocked neutrophilic differentiation. Further, downregulation of Cebpg in murine Cebpa-deficient stem/progenitor cells or in human CEBPA-silenced AML samples restored granulocytic differentiation. In addition, treatment of these leukemias with demethylating agents restored the C/EBPα-C/EBPγ balance and upregulated the expression of myeloid differentiation markers. Our results indicate that C/EBPγ mediates the myeloid differentiation arrest induced by C/EBPα deficiency and that targeting the C/EBPα-C/EBPγ axis rescues neutrophilic differentiation in this unique subset of AMLs.
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Radomska HS, Alberich-Jordà M, Will B, Gonzalez D, Delwel R, Tenen DG. Targeting CDK1 promotes FLT3-activated acute myeloid leukemia differentiation through C/EBPα. J Clin Invest 2012; 122:2955-66. [PMID: 22797303 DOI: 10.1172/jci43354] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Accepted: 06/07/2012] [Indexed: 11/17/2022] Open
Abstract
Mutations that activate the fms-like tyrosine kinase 3 (FLT3) receptor are among the most prevalent mutations in acute myeloid leukemias. The oncogenic role of FLT3 mutants has been attributed to the abnormal activation of several downstream signaling pathways, such as STAT3, STAT5, ERK1/2, and AKT. Here, we discovered that the cyclin-dependent kinase 1 (CDK1) pathway is also affected by internal tandem duplication mutations in FLT3. Moreover, we also identified C/EBPα, a granulopoiesis-promoting transcription factor, as a substrate for CDK1. We further demonstrated that CDK1 phosphorylates C/EBPα on serine 21, which inhibits its differentiation-inducing function. Importantly, we found that inhibition of CDK1 activity relieves the differentiation block in cell lines with mutated FLT3 as well as in primary patient-derived peripheral blood samples. Clinical trials with CDK1 inhibitors are currently under way for various malignancies. Our data strongly suggest that targeting the CDK1 pathway might be applied in the treatment of FLT3ITD mutant leukemias, especially those resistant to FLT3 inhibitor therapies.
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Affiliation(s)
- Hanna S Radomska
- Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, USA
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16
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Koleva RI, Ficarro SB, Radomska HS, Carrasco-Alfonso MJ, Alberta JA, Webber JT, Luckey CJ, Marcucci G, Tenen DG, Marto JA. C/EBPα and DEK coordinately regulate myeloid differentiation. Blood 2012; 119:4878-88. [PMID: 22474248 PMCID: PMC3367892 DOI: 10.1182/blood-2011-10-383083] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 03/10/2012] [Indexed: 11/20/2022] Open
Abstract
The transcription factor C/EBPα is a critical mediator of myeloid differentiation and is often functionally impaired in acute myeloid leukemia. Recent studies have suggested that oncogenic FLT3 activity disrupts wild-type C/EBPα function via phosphorylation on serine 21 (S21). Despite the apparent role of pS21 as a negative regulator of C/EBPα transcription activity, the mechanism by which phosphorylation tips the balance between transcriptionally competent and inhibited forms remains unresolved. In the present study, we used immuno-affinity purification combined with quantitative mass spectrometry to delineate the proteins associated with C/EBPα on chromatin. We identified DEK, a protein with genetic links to leukemia, as a member of the C/EBPα complexes, and demonstrate that this association is disrupted by S21 phosphorylation. We confirmed that DEK is recruited specifically to chromatin with C/EBPα to enhance GCSFR3 promoter activation. In addition, we demonstrated that genetic depletion of DEK reduces the ability of C/EBPα to drive the expression of granulocytic target genes in vitro and disrupts G-CSF-mediated granulocytic differentiation of fresh human BM-derived CD34(+) cells. Our data suggest that C/EBPα and DEK coordinately activate myeloid gene expression and that S21 phosphorylation on wild-type C/EBPα mediates protein interactions that regulate the differentiation capacity of hematopoietic progenitors.
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Affiliation(s)
- Rositsa I Koleva
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215-5450, USA
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Levantini E, Lee S, Radomska HS, Hetherington CJ, Alberich-Jorda M, Amabile G, Zhang P, Gonzalez DA, Zhang J, Basseres DS, Wilson NK, Koschmieder S, Huang G, Zhang DE, Ebralidze AK, Bonifer C, Okuno Y, Gottgens B, Tenen DG. RUNX1 regulates the CD34 gene in haematopoietic stem cells by mediating interactions with a distal regulatory element. EMBO J 2011; 30:4059-70. [PMID: 21873977 DOI: 10.1038/emboj.2011.285] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Accepted: 07/19/2011] [Indexed: 12/22/2022] Open
Abstract
The transcription factor RUNX1 is essential to establish the haematopoietic gene expression programme; however, the mechanism of how it activates transcription of haematopoietic stem cell (HSC) genes is still elusive. Here, we obtained novel insights into RUNX1 function by studying regulation of the human CD34 gene, which is expressed in HSCs. Using transgenic mice carrying human CD34 PAC constructs, we identified a novel downstream regulatory element (DRE), which is bound by RUNX1 and is necessary for human CD34 expression in long-term (LT)-HSCs. Conditional deletion of Runx1 in mice harbouring human CD34 promoter-DRE constructs abrogates human CD34 expression. We demonstrate by chromosome conformation capture assays in LT-HSCs that the DRE physically interacts with the human CD34 promoter. Targeted mutagenesis of RUNX binding sites leads to perturbation of this interaction and decreased human CD34 expression in LT-HSCs. Overall, our in vivo data provide novel evidence about the role of RUNX1 in mediating interactions between distal and proximal elements of the HSC gene CD34.
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Affiliation(s)
- Elena Levantini
- Division of Hematology/Oncology, Beth Israel Deaconess Medical Center, Center for Life Science, Boston, MA, USA.
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18
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Liu TX, Rhodes J, Deng M, Hsu K, Radomska HS, Kanki JP, Tenen DG, Look AT. Dominant-interfering C/EBPalpha stimulates primitive erythropoiesis in zebrafish. Exp Hematol 2007; 35:230-9. [PMID: 17258072 PMCID: PMC2967023 DOI: 10.1016/j.exphem.2006.10.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2006] [Revised: 09/28/2006] [Accepted: 10/02/2006] [Indexed: 11/24/2022]
Abstract
OBJECTIVE We investigated the role of CCAAT enhancer-binding protein-alpha (C/EBPalpha) during zebrafish embryonic blood development. METHODS Whole-mount mRNA in situ hybridization was performed to determine the spatio-temporal expression pattern of zebrafish cebpa in developing hematopoietic progenitors. A deletion mutation of cebpa (zD420), which mimics the human dominant-negative mutations of C/EBPalpha, was transfected into CV1 cell line to evaluate its transcriptional activity in vitro and injected into zebrafish embryos at the one- to two-cell stage to examine its effects on primitive hematopoiesis during early zebrafish development. RESULTS Zebrafish cebpa is expressed in the anterior and posterior lateral plate mesoderm at 12 hours postfertilization, along with scl, pu.1, and gata1 in developing hematopoietic progenitors. In vitro, the deletion mutation of cebpa (zD420) prevents expression of the full-length protein, allowing the expression of truncated isoforms from internal translational initiation sites. As in the human, the truncated zebrafish C/EBPalpha proteins did not activate the expression of known target granulocytic genes, and in fact suppressed transactivation that was induced in vitro by the full-length protein. Forced expression of the zD420 mRNA in zebrafish embryos led to an expansion of primitive erythropoiesis, without a discernible effect on granulopoiesis. CONCLUSION Expression of the truncated isoforms of cebpa alters the developmental pattern of hematopoietic progenitor cells during embryogenesis.
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MESH Headings
- Animals
- Base Sequence
- Blood Vessels/embryology
- Blood Vessels/metabolism
- CCAAT-Enhancer-Binding Protein-alpha/genetics
- CCAAT-Enhancer-Binding Protein-alpha/metabolism
- DNA, Complementary/genetics
- Embryonic Development/genetics
- Embryonic Development/physiology
- Erythropoiesis/genetics
- Gene Deletion
- Gene Expression Regulation, Developmental
- Genes, Dominant
- Hematopoietic Stem Cells/cytology
- Hematopoietic Stem Cells/metabolism
- Humans
- Molecular Sequence Data
- Mutation
- Promoter Regions, Genetic/genetics
- Promoter Regions, Genetic/physiology
- RNA, Messenger
- Reverse Transcriptase Polymerase Chain Reaction/methods
- Sequence Analysis, DNA
- Translocation, Genetic/genetics
- Translocation, Genetic/physiology
- Transplantation, Heterologous
- Zebrafish/embryology
- Zebrafish/genetics
- Zebrafish/metabolism
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Affiliation(s)
- Ting Xi Liu
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115 USA
- Laboratory of Development and Diseases, Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China
| | - Jennifer Rhodes
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115 USA
| | - Min Deng
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115 USA
| | - Karl Hsu
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115 USA
| | - Hanna S. Radomska
- Division of Hematology/Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215 USA
| | - John P. Kanki
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115 USA
| | - Daniel G. Tenen
- Division of Hematology/Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215 USA
| | - A. Thomas Look
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115 USA
- Correspondence to: Prof. A. Thomas Look, M.D., Pediatric Oncology Dept, Dana-Farber Cancer Institute, 44 Binney Street, Mayer 630, Boston, MA 02115. Tel: 617-632-5826; FAX: 617-632-6989.
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Koschmieder S, Agrawal S, Radomska HS, Huettner CS, Tenen DG, Ottmann OG, Berdel WE, Serve HL, Müller-Tidow C. Decitabine and vitamin D3 differentially affect hematopoietic transcription factors to induce monocytic differentiation. Int J Oncol 2007; 30:349-55. [PMID: 17203216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023] Open
Abstract
Standard chemotherapy is not curative for many patients with acute myeloid leukemia (AML). New treatment strategies combining demethylating agents, such as decitabine, and drugs that induce myelomonocytic differentiation (i.e. Vitamin D3) may re-establish functional hematopoiesis in these patients. We studied the effects of decitabine alone or in combination with Vitamin D3 (VD3) on U937 cells and AML blasts. Preincubation with decitabine (0.1-1 microM) and subsequent exposure to VD3 (3 nM) synergistically induced monocytic differentiation. To elucidate the mechanisms of decitabine- and VD3-induced monocytic differentiation, we investigated the effects of the two drugs on transcription factors implicated in monocytic differentiation. Northern and Western blotting showed that decitabine induced transcription of c-jun but not PU.1, while VD3 increased PU.1, IRF8, and C/EBPbeta but not c-jun. Using electromobility shift assays, we demonstrated increased DNA binding of nuclear proteins from decitabine- and VD3-induced U937 cells to the CD11b promoter. In addition, we investigated whether the myeloid transcription factor Sp1 played a role in decitabine- and VD3-induced CD14 expression. Indeed, we found that mithramycin A, a specific inhibitor of Sp1, inhibited both VD3- and decitabine-induced upregulation of CD14, which is in line with previous data showing that Sp1 is critical for CD14 promoter activity. Induction of CD11b and/or CD14 by decitabine and/or VD3 was confirmed in primary AML patient samples at the time of diagnosis. In conclusion, decitabine synergizes with Vitamin D3 to induce CD11b and CD14 expression, likely by enhancing PU.1/c-jun and Sp1 transcriptional activity.
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Affiliation(s)
- Steffen Koschmieder
- Department of Internal Medicine-Hematology and Oncology, University Hospital of Münster, Germany.
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20
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Yin H, Radomska HS, Tenen DG, Glass J. Down regulation of PSA by C/EBPalpha is associated with loss of AR expression and inhibition of PSA promoter activity in the LNCaP cell line. BMC Cancer 2006; 6:158. [PMID: 16774685 PMCID: PMC1544346 DOI: 10.1186/1471-2407-6-158] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2006] [Accepted: 06/14/2006] [Indexed: 11/13/2022] Open
Abstract
Background C/EBPα is a transcription factor essential for terminal differentiation of several cell types. It has not known if C/EBPα protein is expressed and functions in the prostate gland. Methods The presence of C/EBPα in normal and cancerous prostate epithelium was examined by immunochemistry. Over expression of C/EBPα in LNCaP cells was conducted with retrovirus-mediated transduction. PSA expression was examined by RT-PCR and western blot and PSA promoter activity by luciferase reporter assay. Results In normal prostate C/EBPα was expressed in the basal layer of the epithelium. In prostate cancer C/EBPα was detected at low levels throughout the cancers and in advanced prostate cancer C/EBPα expression was associated with decreased expression of AR and PSA. Overexpression of C/EBPα inhibited epigenetically PSA expression and was accompanied by the loss of expression of AR. Transient increase of C/EBPα inhibited the PSA promoter/enhancer activity independently of expression of AR. Conclusion In LNCaP cells C/EBPα over expression inhibits expression of PSA by AR -dependent and independent mechanisms and by extinguishing AR expression provides a model for hormonal independent cell growth.
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Affiliation(s)
- Hong Yin
- Feist-Weiller Cancer Center and Department of Medicine, LSU Health Sciences Center, Shreveport, LA, USA
| | - Hanna S Radomska
- Harvard Institute of Medicine, Beth Israel Hospital, Boston, MA, USA
| | - Daniel G Tenen
- Harvard Institute of Medicine, Beth Israel Hospital, Boston, MA, USA
| | - Jonathan Glass
- Feist-Weiller Cancer Center and Department of Medicine, LSU Health Sciences Center, Shreveport, LA, USA
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21
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Wagner K, Zhang P, Rosenbauer F, Drescher B, Kobayashi S, Radomska HS, Kutok JL, Gilliland DG, Krauter J, Tenen DG. Absence of the transcription factor CCAAT enhancer binding protein alpha results in loss of myeloid identity in bcr/abl-induced malignancy. Proc Natl Acad Sci U S A 2006; 103:6338-43. [PMID: 16606850 PMCID: PMC1458879 DOI: 10.1073/pnas.0508143103] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The lineage-determining transcription factor CCAAT enhancer binding protein alpha (C/EBPalpha) is required for myeloid differentiation. Decreased function or expression of C/EBPalpha is often found in human acute myeloid leukemia. However, the precise impact of C/EBPalpha deficiency on the maturation arrest in leukemogenesis is not well understood. To address this question, we used a murine transplantation model of a bcr/abl-induced myeloproliferative disease. The expression of bcr/abl in C/EBPalphapos fetal liver cells led to a chronic myeloid leukemia-like disease. Surprisingly, bcr/abl-expressing C/EBPalpha-/- fetal liver cells failed to induce a myeloid disease in transplanted mice, but caused a fatal, transplantable erythroleukemia instead. Accordingly, increased expression of the transcription factors SCL and GATA-1 in hematopoietic precursor cells of C/EBPalpha-/-R01-EY-11298 ) fetal livers was found. The mechanism for the lineage shift from myeloid to erythroid leukemia was studied in a bcr/abl-positive cell line. Consistent with findings of the transplant model, expression of C/EBPalpha and GATA-1 was inversely correlated. Id1, an inhibitor of erythroid differentiation, was identified as a critical direct target of C/EBPalpha. Down-regulation of Id1 by RNA interference impaired C/EBPalpha-induced granulocytic differentiation. Taken together, our study provides evidence that myeloid lineage identity of malignant hematopoietic progenitor cells requires the residual expression of C/EBPalpha.
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MESH Headings
- Animals
- Basic Helix-Loop-Helix Transcription Factors/metabolism
- CCAAT-Enhancer-Binding Protein-alpha/deficiency
- CCAAT-Enhancer-Binding Protein-alpha/genetics
- Cell Differentiation/genetics
- Fusion Proteins, bcr-abl/genetics
- Fusion Proteins, bcr-abl/metabolism
- GATA1 Transcription Factor/metabolism
- Hematopoietic Stem Cells/metabolism
- Hematopoietic Stem Cells/pathology
- Inhibitor of Differentiation Protein 1/genetics
- Inhibitor of Differentiation Protein 1/metabolism
- Leukemia, Erythroblastic, Acute/genetics
- Leukemia, Erythroblastic, Acute/metabolism
- Leukemia, Erythroblastic, Acute/pathology
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Mice
- Myeloid Cells/pathology
- Neoplasm Transplantation
- Proto-Oncogene Proteins/metabolism
- RNA Interference
- T-Cell Acute Lymphocytic Leukemia Protein 1
- Transcription Factors/deficiency
- Transcription Factors/genetics
- Transfection
- Up-Regulation
- Xenograft Model Antitumor Assays
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Affiliation(s)
- Katharina Wagner
- *Harvard Institutes of Medicine, Room 954, 77 Avenue Louis Pasteur, Boston, MA 02115
- Department of Hematology, Hemostaseology, and Oncology, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
| | - Pu Zhang
- *Harvard Institutes of Medicine, Room 954, 77 Avenue Louis Pasteur, Boston, MA 02115
| | - Frank Rosenbauer
- *Harvard Institutes of Medicine, Room 954, 77 Avenue Louis Pasteur, Boston, MA 02115
- Max-Delbrück-Center for Molecular Medicine, Robert-Rössle-Strasse 10, 13092 Berlin, Germany
| | - Bettina Drescher
- Department of Hematology, Hemostaseology, and Oncology, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
| | - Susumu Kobayashi
- *Harvard Institutes of Medicine, Room 954, 77 Avenue Louis Pasteur, Boston, MA 02115
| | - Hanna S. Radomska
- *Harvard Institutes of Medicine, Room 954, 77 Avenue Louis Pasteur, Boston, MA 02115
| | | | - D. Gary Gilliland
- Medicine, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115; and
| | - Jürgen Krauter
- Department of Hematology, Hemostaseology, and Oncology, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
| | - Daniel G. Tenen
- *Harvard Institutes of Medicine, Room 954, 77 Avenue Louis Pasteur, Boston, MA 02115
- To whom correspondence should be addressed. E-mail:
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22
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Radomska HS, Bassères DS, Zheng R, Zhang P, Dayaram T, Yamamoto Y, Sternberg DW, Lokker N, Giese NA, Bohlander SK, Schnittger S, Delmotte MH, Davis RJ, Small D, Hiddemann W, Gilliland DG, Tenen DG. Block of C/EBP alpha function by phosphorylation in acute myeloid leukemia with FLT3 activating mutations. J Exp Med 2006; 203:371-81. [PMID: 16446383 PMCID: PMC2118199 DOI: 10.1084/jem.20052242] [Citation(s) in RCA: 158] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2005] [Accepted: 12/22/2005] [Indexed: 12/17/2022] Open
Abstract
Mutations constitutively activating FLT3 kinase are detected in approximately 30% of acute myelogenous leukemia (AML) patients and affect downstream pathways such as extracellular signal-regulated kinase (ERK)1/2. We found that activation of FLT3 in human AML inhibits CCAAT/enhancer binding protein alpha (C/EBPalpha) function by ERK1/2-mediated phosphorylation, which may explain the differentiation block of leukemic blasts. In MV4;11 cells, pharmacological inhibition of either FLT3 or MEK1 leads to granulocytic differentiation. Differentiation of MV4;11 cells was also observed when C/EBPalpha mutated at serine 21 to alanine (S21A) was stably expressed. In contrast, there was no effect when serine 21 was mutated to aspartate (S21D), which mimics phosphorylation of C/EBPalpha. Thus, our results suggest that therapies targeting the MEK/ERK cascade or development of protein therapies based on transduction of constitutively active C/EBPalpha may prove effective in treatment of FLT3 mutant leukemias resistant to the FLT3 inhibitor therapies.
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Affiliation(s)
- Hanna S Radomska
- Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA 02115, USA
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23
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Okuno Y, Huang G, Rosenbauer F, Evans EK, Radomska HS, Iwasaki H, Akashi K, Moreau-Gachelin F, Li Y, Zhang P, Göttgens B, Tenen DG. Potential autoregulation of transcription factor PU.1 by an upstream regulatory element. Mol Cell Biol 2005; 25:2832-45. [PMID: 15767686 PMCID: PMC1061634 DOI: 10.1128/mcb.25.7.2832-2845.2005] [Citation(s) in RCA: 137] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Regulation of the hematopoietic transcription factor PU.1 (Spi-1) plays a critical role in the development of white cells, and abnormal expression of PU.1 can lead to leukemia. We previously reported that the PU.1 promoter cannot induce expression of a reporter gene in vivo, and cell-type-specific expression of PU.1 in stable lines was conferred by a 3.4-kb DNA fragment including a DNase I hypersensitive site located 14 kb upstream of the transcription start site. Here we demonstrate that this kb -14 site confers lineage-specific reporter gene expression in vivo. This kb -14 upstream regulatory element contains two 300-bp regions which are highly conserved in five mammalian species. In Friend virus-induced erythroleukemia, the spleen focus-forming virus integrates into the PU.1 locus between these two conserved regions. DNA binding experiments demonstrated that PU.1 itself and Elf-1 bind to a highly conserved site within the proximal homologous region in vivo. A mutation of this site abolishing binding of PU.1 and Elf-1 led to a marked decrease in the ability of this upstream element to direct activity of reporter gene in myelomonocytic cell lines. These data suggest that a potential positive autoregulatory loop mediated through an upstream regulatory element is essential for proper PU.1 gene expression.
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Affiliation(s)
- Yutaka Okuno
- Harvard Institutes of Medicine, Room 954, 77 Ave. Louis Pasteur, Boston, MA 02115, USA
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24
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Ross SE, Radomska HS, Wu B, Zhang P, Winnay JN, Bajnok L, Wright WS, Schaufele F, Tenen DG, MacDougald OA. Phosphorylation of C/EBPalpha inhibits granulopoiesis. Mol Cell Biol 2004; 24:675-86. [PMID: 14701740 PMCID: PMC343788 DOI: 10.1128/mcb.24.2.675-686.2004] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2003] [Revised: 07/16/2003] [Accepted: 10/14/2003] [Indexed: 11/20/2022] Open
Abstract
CCAAT/enhancer-binding protein alpha (C/EBPalpha) is one of the key transcription factors that mediate lineage specification and differentiation of multipotent myeloid progenitors into mature granulocytes. Although C/EBPalpha is known to induce granulopoiesis while suppressing monocyte differentiation, it is unclear how C/EBPalpha regulates this cell fate choice at the mechanistic level. Here we report that inducers of monocyte differentiation inhibit the alternate cell fate choice, that of granulopoiesis, through inhibition of C/EBPalpha. This inhibition is mediated by extracellular signal-regulated kinases 1 and/or 2 (ERK1/2), which interact with C/EBPalpha through an FXFP docking site and phosphorylate serine 21. As a consequence of C/EBPalpha phosphorylation, induction of granulocyte differentiation by C/EBPalpha or retinoic acid is inhibited. Our analysis of C/EBPalpha by fluorescent resonance energy transfer revealed that phosphorylation induces conformational changes in C/EBPalpha, increasing the distance between the amino termini of C/EBPalpha dimers. Thus, myeloid development is partly regulated by an ERK1/2-mediated change in the conformation of C/EBPalpha that favors monocyte differentiation by blocking granulopoiesis.
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Affiliation(s)
- Sarah E Ross
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, 1301 E. Catherine Street, Ann Arbor, MI 48109-0622, USA
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25
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Huettner CS, Koschmieder S, Iwasaki H, Iwasaki-Arai J, Radomska HS, Akashi K, Tenen DG. Inducible expression of BCR/ABL using human CD34 regulatory elements results in a megakaryocytic myeloproliferative syndrome. Blood 2003; 102:3363-70. [PMID: 12855552 DOI: 10.1182/blood-2003-03-0768] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The BCR/ABL fusion protein is found in more than 90% of patients with chronic myeloid leukemia (CML) as well as in a subset of patients with acute B-cell leukemia. We have previously described a transgenic model for an inducible and reversible acute B-cell leukemia caused by p210 BCR/ABL. Here, we describe a new model of an inducible BCR/ABL disease by directing the expression of the oncogene to megakaryocytic progenitor cells within the murine bone marrow using the tetracycline-responsive expression system under the control of human CD34 regulatory elements. The predominant feature was the development of a chronic thrombocytosis. The condition progressed with the development of splenomegaly accompanied by lymphadenopathy in some mice. Affected animals demonstrated a dramatic increase in the number of megakaryocytes in the bone marrow and the spleen. Immunohistochemistry demonstrated that the reporter gene was expressed in hematopoietic stem cells (HSCs), common myeloid progenitor (CMP) cells, as well as in megakaryocytic/erythroid progenitor cells (MEPs). Although these mice did not display the increase in granulopoiesis commonly found in chronic myeloid leukemia (CML), the phenotype closely resembles a myeloproliferative disorder affecting the megakaryocytic lineage observed in some patients with the BCR/ABL P210 translocation.
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Affiliation(s)
- Claudia S Huettner
- Harvard Institutes of Medicine, Harvard Medical School, Boston, MA 02115, USA
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26
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D'Alo' F, Johansen LM, Nelson EA, Radomska HS, Evans EK, Zhang P, Nerlov C, Tenen DG. The amino terminal and E2F interaction domains are critical for C/EBP alpha-mediated induction of granulopoietic development of hematopoietic cells. Blood 2003; 102:3163-71. [PMID: 12869508 DOI: 10.1182/blood-2003-02-0479] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The transcription factor C/EBP alpha (CCAAT/enhancer binding protein alpha) is critical for granulopoiesis. Gene disruption in mice blocks early granulocyte differentiation and disruption of C/EBP alpha function has been implicated in human acute myeloid leukemia (AML), but no systematic structure-function analysis has been undertaken to identify the mechanisms involved in C/EBP alpha-mediated granulocyte differentiation. Here we demonstrate that loss of either of 2 key regions results in disruption of C/EBP alpha granulocytic development: the amino terminus and specific residues residing on the non-DNA binding face of the basic region. Mutation of either results in loss of C/EBP alpha inhibition of E2F and down-regulation of c-Myc, but only mutation of the basic region results in loss of physical interaction with E2F. In contrast, while the amino terminal mutant retains the ability to interact with E2F, this mutant fails to bind a C/EBP alpha site efficiently, fails to activate C/EBP alpha target genes, and is also defective in inhibition of E2F activity. These results further emphasize the importance of inhibition of proliferative pathways in granulopoiesis and demonstrate that several regions of the C/EBP alpha protein are involved in this mechanism.
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Affiliation(s)
- Francesco D'Alo'
- Hematology/Oncology Division, Harvard Institutes of Medicine, Boston, MA 02115, USA
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27
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Abstract
The elements regulating gene expression in hematopoietic stem cells are still poorly understood. We previously reported that a 141-kilobase (kb) human CD34 transgene confers properly regulated human CD34 expression in transgenic mice. A construct with only the human CD34 promoter and 3' enhancer region is not sufficient, suggesting that critical distal elements are necessary for expression of the human CD34 gene. To further localize such elements, we analyzed deletion constructs of the human CD34 gene and evaluated their function in transgenic mice. Constructs harboring as little as 18 kb of 5' and 26 kb of 3' human CD34 flanking sequence conferred human expression in tissues of transgenic mice with a pattern similar to that of the 141-kb human transgene. In contrast, a construct harboring 10 kb of 5' and 17 kb of 3' human CD34 flanking sequence gave no expression. These data demonstrate that regions between 10 to 18 kb upstream and/or 17 to 26 kb downstream of the human CD34 gene contain critical elements for human CD34 expression in vivo. Further functional analysis of these regions in transgenic mice will be crucial for understanding CD34 gene expression in hematopoietic stem and progenitor cells.
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Affiliation(s)
- Yutaka Okuno
- Hematology/Oncology Division, Harvard Institutes of Medicine, Boston, MA 02115, USA
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28
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Radomska HS, Gonzalez DA, Okuno Y, Iwasaki H, Nagy A, Akashi K, Tenen DG, Huettner CS. Transgenic targeting with regulatory elements of the human CD34 gene. Blood 2002; 100:4410-9. [PMID: 12393582 DOI: 10.1182/blood-2002-02-0355] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The human CD34 gene is expressed on early progenitor and stem cells in the bone marrow. Here we report the isolation of the human CD34 locus from a human P1 artificial chromosome (PAC) library and the characterization and evaluation of this genomic fragment for expression of reporter genes in stable cell lines and transgenic mice. We show that a 160-kb fragment spanning 110 kb of the 5' flanking region and 26 kb of the 3' flanking region of the CD34 gene directs expression of the human CD34 gene in the bone marrow of transgenic mice. The expression of human CD34 transgenic RNA in tissues was found to be similar to that of the endogenous murine CD34 gene. Colony-forming cell assays showed that bone marrow cells staining positive for human CD34 consist of early progenitor cells in which expression of CD34 decreased with cell maturation. In order to test the construct for its ability to express heterologous genes in vivo, we used homologous recombination in bacteria to insert the tetracycline-responsive transactivator protein tTA. Analysis of transgenic human CD34-tTA mice by cross breeding with a strain carrying Cre recombinase under control of a tetracycline-responsive element demonstrated induction of Cre expression in mice in a pattern consistent with the expression of the human CD34 transgene.
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Affiliation(s)
- Hanna S Radomska
- Harvard Institutes of Medicine, Harvard Medical School, Boston, MA 02115, USA.
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29
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Behre G, Singh SM, Liu H, Bortolin LT, Christopeit M, Radomska HS, Rangatia J, Hiddemann W, Friedman AD, Tenen DG. Ras signaling enhances the activity of C/EBP alpha to induce granulocytic differentiation by phosphorylation of serine 248. J Biol Chem 2002; 277:26293-9. [PMID: 11978795 DOI: 10.1074/jbc.m202301200] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The transcription factor C/EBP alpha regulates early steps of normal granulocyte differentiation since mice with a disruption of the C/EBP alpha gene do not express detectable levels of the granulocyte colony-stimulating factor receptor and produce no neutrophils. We have recently shown that C/EBP alpha function is also impaired in acute myeloid leukemias. However, how the transcriptional activity of C/EBP alpha is regulated both in myelopoiesis and leukemogenesis is not fully understood. The current study demonstrates that activated Ras enhances the ability of C/EBP alpha to transactivate the granulocyte colony-stimulating factor receptor promoter and a minimal promoter containing only C/EBP DNA binding sites. Ras signaling activates C/EBP alpha via the transactivation domain because it enhances the transactivation function of a fusion protein containing a Gal4 DNA binding domain and the C/EBP alpha transactivation domain and does not change C/EBP alpha DNA binding. Ras acts on serine 248 of the C/EBP alpha transactivation domain, because it does not enhance the transactivation function of a C/EBP alpha serine 248 to alanine point mutant. Interestingly, serine 248 of C/EBP alpha is a protein kinase C (PKC) consensus site, and a PKC inhibitor blocks the activation of C/EB alpha by Ras. Ras signaling leads to phosphorylation of C/EBP alpha in vivo. Finally, mutation of serine 248 to alanine obviates the ability of C/EBP alpha to induce granulocytic differentiation. These data suggest a model where Ras signaling enhances the activity of C/EBP alpha to induce granulocytic differentiation by phosphorylation of serine 248.
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Affiliation(s)
- Gerhard Behre
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-University Munich and GSF-National Research Center for Environment and Health, D-81377 Munich, Germany.
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30
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Abstract
The CCAAT enhancer binding protein alpha (C/EBP alpha) transcription factor plays a critical role in granulocytopoiesis. Mice with a disruption of the C/EBP alpha gene demonstrate an early block in granulocytic differentiation, and disruption of C/EBP alpha function is a common theme in many types of human acute myelogenous leukemia, which is characterized by a block in myeloid development. To characterize further the nature of this block, we derived cell lines from the fetal liver of C/EBP alpha-deficient animals. These lines resembled morphologically the immature myeloid blasts observed in C/EBP alpha(-/-) fetal livers and did not express messenger RNA encoding early myeloid genes such as myeloperoxidase. Similarly, granulocytic markers such as Mac-1 and Gr-1 were not expressed; nor were erythroid and lymphoid surface antigens. Introduction of an inducible C/EBP alpha gene into the line revealed that conditional expression of C/EBP alpha induced the C/EBP family members C/EBP beta and C/EBP epsilon and subsequent granulocyte differentiation. Similar results were obtained when C/EBP alpha(-/-) cells were stimulated with the cytokines interleukin-3 and granulocyte-macrophage colony-stimulating factor, but not with all-trans retinoic acid, supporting a model of at least 2 pathways leading to the differentiation of myeloid progenitors to granulocytes and implicating induction of other C/EBP family members in granulopoiesis.
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Affiliation(s)
- Pu Zhang
- Harvard Institutes of Medicine, Harvard Medical School, Boston, MA 02115, USA
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31
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Okuno Y, Iwasaki H, Huettner CS, Radomska HS, Gonzalez DA, Tenen DG, Akashi K. Differential regulation of the human and murine CD34 genes in hematopoietic stem cells. Proc Natl Acad Sci U S A 2002; 99:6246-51. [PMID: 11983914 PMCID: PMC122934 DOI: 10.1073/pnas.092027799] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Human CD34 (hCD34)-positive cells are used currently as a source for hematopoietic transplantation in humans. However, in steady-state murine hematopoiesis, hematopoietic stem cells (HSCs) with long-term reconstitution activity are found almost exclusively in the murine CD34 (mCD34)-negative to low fraction. To evaluate the possible differences in hCD34 and mCD34 gene expression in hematopoiesis, we made transgenic mouse strains with human genomic P1 artificial chromosome clones spanning the entire hCD34 genomic locus. In all transgenic mouse strains, a vast majority of phenotypic and functional HSC populations including mCD34(-/lo) express the hCD34 transgene. These data strongly support the notion that hCD34(+) human bone marrow cells contain long-term HSCs that can maintain hematopoiesis throughout life.
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Affiliation(s)
- Yutaka Okuno
- Hematology/Oncology Division, Harvard Institutes of Medicine, and Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
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32
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Li Y, Okuno Y, Zhang P, Radomska HS, Chen H, Iwasaki H, Akashi K, Klemsz MJ, McKercher SR, Maki RA, Tenen DG. Regulation of the PU.1 gene by distal elements. Blood 2001; 98:2958-65. [PMID: 11698277 DOI: 10.1182/blood.v98.10.2958] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The transcription factor PU.1 (also known as Spi-1) plays a critical role in the development of the myeloid lineages, and myeloid cells derived from PU.1(-/-) animals are blocked at the earliest stage of myeloid differentiation. Expression of the PU.1 gene is tightly regulated during normal hematopoietic development, and dysregulation of PU.1 expression can lead to erythroleukemia. However, relatively little is known about how the PU.1 gene is regulated in vivo. Here it is shown that myeloid cell type-specific expression of PU.1 in stable cell lines and transgenic animals is conferred by a 91-kilobase (kb) murine genomic DNA fragment that consists of the entire PU.1 gene (20 kb) plus approximately 35 kb of upstream and downstream sequences, respectively. To further map the important transcriptional regulatory elements, deoxyribonuclease I hypersensitive site mapping studies revealed at least 3 clusters in the PU.1 gene. A 3.5-kb fragment containing one of these deoxyribonuclease I hypersensitive sites, located -14 kb 5' of the transcriptional start site, conferred myeloid cell type-specific expression in stably transfected cell lines, suggesting that within this region is an element important for myeloid specific expression of PU.1. Further analysis of this myeloid-specific regulatory element will provide insight into the regulation of this key transcriptional regulator and may be useful as a tool for targeting expression to the myeloid lineage.
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Affiliation(s)
- Y Li
- Harvard Institutes of Medicine, Harvard Medical School, Boston, MA 02115, USA
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33
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Abstract
The activity of Ig gene promoters and enhancers is regulated by two related transcription factors, Oct-1 (ubiquitous) and Oct-2 (B lineage specific), which bind the octamer motif (ATTTGCAT) present in these elements. As Ig promoter-binding factors, Oct-1 and Oct-2 each work together with a B lymphocyte-specific cofactor OCA-B/OBF-1/Bob-1 that interacts with them through their POU (DNA-binding) domains. Because both can mediate Ig promoter activity in B cells, there has been some question as to whether these two octamer-binding factors serve distinct functions in lymphocytes. We have shown previously that the silencing of B lymphocyte-specific genes in plasmacytoma x T lymphoma hybrids can be prevented by preserving Oct-2 expression. The pronounced effect of this transcription factor on the phenotype of plasmacytoma x T lymphoma hybrids established a critical role for Oct-2 not only in maintaining Ig gene expression, but in maintaining the overall genetic program of Ig-secreting cells. In the present study, we have explored the functional differences between Oct-1 and Oct-2 using chimeric Oct-1/Oct-2 proteins in cell fusion assays. Our results provide further evidence for an essential role for Oct-2 in Ig-secreting cells and identify the C-terminal domain of Oct-2 as responsible for its unique function in these cells.
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Affiliation(s)
- M N Sharif
- Department of Biological Sciences, Hunter College, Graduate School of City University of New York, New York, NY 10021, USA
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34
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Pabst T, Mueller BU, Zhang P, Radomska HS, Narravula S, Schnittger S, Behre G, Hiddemann W, Tenen DG. Dominant-negative mutations of CEBPA, encoding CCAAT/enhancer binding protein-alpha (C/EBPalpha), in acute myeloid leukemia. Nat Genet 2001; 27:263-70. [PMID: 11242107 DOI: 10.1038/85820] [Citation(s) in RCA: 682] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The transcription factor C/EBPalpha (for CCAAT/enhancer binding protein-alpha; encoded by the gene CEBPA) is crucial for the differentiation of granulocytes. Conditional expression of C/EBPalpha triggers neutrophilic differentiation, and no mature granulocytes are observed in Cebpa-mutant mice. Here we identify heterozygous mutations in CEBPA in ten patients with acute myeloid leukemia (AML). We found that five mutations in the amino terminus truncate the full-length protein, but did not affect a 30-kD protein initiated further downstream. The mutant proteins block wild-type C/EBPalpha DNA binding and transactivation of granulocyte target genes in a dominant-negative manner, and fails to induce granulocytic differentiation. Ours is the first report of CEBPA mutations in human neoplasia, and such mutations are likely to induce the differentiation block found in AML.
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Affiliation(s)
- T Pabst
- Hematology/Oncology Division, Harvard Institutes of Medicine, Harvard Medical School, Boston, Massachusetts, USA
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35
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Abstract
When immunoglobulin (Ig)-secreting plasmacytomas are fused to a T-cell lymphoma, Ig gene expression ceases in greater than 95% of the resulting hybrids. In the rare hybrids that continue to express Ig, all other tested B lymphocyte-specific genes also remain active. The low frequency with which these Ig-expressing hybrids are recovered, along with the fact that cell fusions can lead to chromosome loss, led us to propose that this rare phenotype was due to loss of a T-cell-derived chromosome encoding a factor or factors with gene silencing activity. To identify the relevant chromosome, we have used a polymerase chain reaction (PCR)-assisted method of chromosome mapping to analyze both Ig-silenced (common) and Ig-expressing (rare) hybrids. Although no single chromosome was found to correlate with Ig gene silencing, we discovered that the two types of hybrids had undergone distinct patterns of chromosome loss. Moreover, we found that ectopic expression of a B-cell-specific transcription factor (Oct-2) dramatically altered both the phenotype and chromosome constitution of hybrids arising in these cell fusions.
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Affiliation(s)
- M D Hines
- Department of Biological Sciences, Hunter College of The City University of New York, New York, NY, (USA)
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36
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Radomska HS, Satterthwaite AB, Taranenko N, Narravula S, Krause DS, Tenen DG. A nuclear factor Y (NFY) site positively regulates the human CD34 stem cell gene. Blood 1999; 94:3772-80. [PMID: 10572091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
Proper regulation of the human CD34 gene requires a combinatorial action of multiple proximal and long-range, cis elements. This report shows that, like the murine CD34 5' untranslated region (UTR), the corresponding region of the human CD34 gene is necessary for optimal promoter activity. We localized the most critical element of this region to base pairs +48/+75. Through oligonucleotide competition and antibody supershift experiments in electrophoretic mobility shift assays, we found that this sequence contains a binding site (CCAAT box) for the transcription factor NFY (nuclear factor Y), a factor mediating cell type-specific and cell-cycle regulated expression of genes. Mutating this site led to a 5-fold decrease in CD34 promoter activity in transient transfection experiments. Interestingly, NFY binds adjacently to the earlier identified c-myb binding site. Here we show that both binding sites are important for CD34 promoter function: mutating either site alone decreased CD34 promoter-driven reporter gene activity 4-fold. We also show that the integrity of the c-myb binding site is necessary for stabilization of NFY binding to its site. Such cooperation between c-myb, which is expressed in early hematopoietic cells, and NFY, which is expressed in many cell types, might contribute to specific activation of CD34 in stem cells. The CCAAT box motif was also noted in the 5' UTR of the murine CD34 gene, however, NFY did not bind to this region. Thus, our results indicate that the functional similarities between the human and murine CD34 5' UTRs are achieved through different molecular mechanism(s).
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Affiliation(s)
- H S Radomska
- Department of Medicine, Harvard Institutes of Medicine, Harvard Medical School, Boston, MA 02115, USA
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37
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Radomska HS, Satterthwaite AB, Burn TC, Oliff IA, Huettner CS, Tenen DG. Corrigendum to: “Multiple control elements are required for expression of the human CD34 gene”. Gene X 1999. [DOI: 10.1016/s0378-1119(99)00416-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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38
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Zhang P, Behre G, Pan J, Iwama A, Wara-Aswapati N, Radomska HS, Auron PE, Tenen DG, Sun Z. Negative cross-talk between hematopoietic regulators: GATA proteins repress PU.1. Proc Natl Acad Sci U S A 1999; 96:8705-10. [PMID: 10411939 PMCID: PMC17580 DOI: 10.1073/pnas.96.15.8705] [Citation(s) in RCA: 372] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The process through which multipotential hematopoietic cells commit to distinct lineages involves the induction of specific transcription factors. PU.1 (also known as Spi-1) and GATA-1 are transcription factors essential for the development of myeloid and erythroid lineages, respectively. Overexpression of PU.1 and GATA-1 can block differentiation in lineages in which they normally are down-regulated, indicating that not only positive but negative regulation of these factors plays a role in normal hematopoietic lineage development. Here we demonstrate that a region of the PU.1 Ets domain (the winged helix-turn-helix wing) interacts with the conserved carboxyl-terminal zinc finger of GATA-1 and GATA-2 and that GATA proteins inhibit PU.1 transactivation of critical myeloid target genes. We demonstrate further that GATA inhibits binding of PU.1 to c-Jun, a critical coactivator of PU.1 transactivation of myeloid promoters. Finally, PU.1 protein can inhibit both GATA-1 and GATA-2 transactivation function. Our results suggest that interactions between PU.1 and GATA proteins play a critical role in the decision of stem cells to commit to erythroid vs. myeloid lineages.
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Affiliation(s)
- P Zhang
- Hematology/Oncology Division, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
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39
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Abstract
Two cis regulatory elements of the human CD34 gene, the promoter and a 3' enhancer, have previously been described. In transient transfection assays, the promoter was not sufficient to direct cell type specific expression. In contrast, the 3' enhancer was active only in CD34+ cell lines, suggesting that this element might be responsible for stem cell-restricted expression of the CD34 gene. In the current work, through deletion and transient transfection experiments, we delineated the core enhancer sequence. We examined the role of this element upon stable integration. Our data suggested the presence of additional control elements. In order to identify them, using DNaseI hypersensitivity and methylation studies, we determined the chromatin structure of the entire CD34 locus. Amongst a number of DNaseI hypersensitive sites, we detected a strong CD34+ cell type-specific site in intron 4. This region, however, did not work as an enhancer by itself. By analyzing stable transfectants and transgenic animals, we demonstrated that the 3' enhancer and intron 4 hypersensitive regions, either alone or together, did not function as a locus control region upon chromosomal integration. In contrast, a 160kb genomic fragment encompassing the entire CD34 gene contained regulatory elements sufficient for high-level CD34 mRNA expression in murine stable lines. Our data indicate that combinatorial action of multiple, proximal and long-range, cis elements is necessary for proper regulation of CD34 expression.
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Affiliation(s)
- H S Radomska
- Hematology/Oncology Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
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40
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Radomska HS, Huettner CS, Zhang P, Cheng T, Scadden DT, Tenen DG. CCAAT/enhancer binding protein alpha is a regulatory switch sufficient for induction of granulocytic development from bipotential myeloid progenitors. Mol Cell Biol 1998; 18:4301-14. [PMID: 9632814 PMCID: PMC109014 DOI: 10.1128/mcb.18.7.4301] [Citation(s) in RCA: 391] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/1997] [Accepted: 03/24/1998] [Indexed: 02/07/2023] Open
Abstract
The transcription factor CCAAT/enhancer binding protein alpha (C/EBPalpha) regulates a number of myeloid cell-specific genes. To delineate the role of C/EBPalpha in human granulopoiesis, we studied its expression and function in human primary cells and bipotential (granulocytic/monocytic) myeloid cell lines. We show that the expression of C/EBPalpha initiates with the commitment of multipotential precursors to the myeloid lineage, is specifically upregulated during granulocytic differentiation, and is rapidly downregulated during the alternative monocytic pathway. Conditional expression of C/EBPalpha alone in stably transfected bipotential cells triggers neutrophilic differentiation, concomitant with upregulation of the granulocyte-specific granulocyte colony-stimulating factor receptor and secondary granule protein genes. Moreover, induced expression of C/EBPalpha in bipotential precursors blocks their monocytic differentiation program. These results indicate that C/EBPalpha serves as a myeloid differentiation switch acting on bipotential precursors and directing them to mature to granulocytes.
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Affiliation(s)
- H S Radomska
- Hematology/Oncology Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
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41
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Chen HM, Gonzalez DA, Radomska HS, Voso MT, Sun Z, Zhang P, Zhang DE, Tenen DG. Two promoters direct expression of the murine Spi-B gene, an Ets family transcription factor. Gene X 1998; 207:209-18. [PMID: 9511763 DOI: 10.1016/s0378-1119(97)00629-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Spi-B and PU.1 (Spi-1) comprise the most divergent subfamily of the Ets transcription factor family. Spi-B and PU.1 bind to similar DNA sequences, and can activate the same B-cell and myeloid promoters in vitro. However, PU.1 knockout mice demonstrate defective hematopoietic development of multiple hematopoietic lineages, indicating that Spi-B was not able to compensate for loss of PU.1. One explanation for these results is that, in contrast to PU.1, which is expressed in myeloid and B-cell lines, Spi-B expression is restricted to B-cells. In order to begin to understand the control of regulation of the Spi-B gene, murine Spi-B cDNA and genomic clones were isolated. The exon/intron organization and transcriptional start sites were determined; two major transcriptional start sites were detected. The two Spi-B promoters were isolated and characterized, and displayed differential activity in B-cell lines matching that of the endogenous gene. Further study of the two Spi-B promoters will provide insight into the molecular events regulating the tissue-specific and developmental stage-specific expression of Spi-B in B-cells.
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Affiliation(s)
- H M Chen
- Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
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42
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Yamanaka R, Kim GD, Radomska HS, Lekstrom-Himes J, Smith LT, Antonson P, Tenen DG, Xanthopoulos KG. CCAAT/enhancer binding protein epsilon is preferentially up-regulated during granulocytic differentiation and its functional versatility is determined by alternative use of promoters and differential splicing. Proc Natl Acad Sci U S A 1997; 94:6462-7. [PMID: 9177240 PMCID: PMC21072 DOI: 10.1073/pnas.94.12.6462] [Citation(s) in RCA: 153] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/1997] [Accepted: 04/16/1997] [Indexed: 02/04/2023] Open
Abstract
CCAAT/enhancer binding protein (C/EBP) epsilon is a recently cloned member of the C/EBP family of transcription factors and is expressed exclusively in cells of hematopoietic origin. The human C/EBPepsilon gene is transcribed by two alternative promoters, Palpha and Pbeta. A combination of differential splicing and alternative use of promoters generates four mRNA isoforms, of 2.6 kb and 1.3-1.5 kb in size. These transcripts can encode three proteins of calculated molecular mass 32.2 kDa, 27.8 kDa, and 14.3 kDa. Accordingly, Western blots with antibodies specific for the DNA-binding domain, that is common to all forms, identify multiple proteins. C/EBPepsilon mRNA was greatly induced during in vitro granulocytic differentiation of human primary CD34(+) cells. Retinoic acid treatment of HL60 promyelocytic leukemia cells for 24 hr induced C/EBPepsilon mRNA levels by 4-fold, while prolonged treatment gradually reduced mRNA expression to pretreatment levels. Transient transfection experiments with expression vectors for two of the isoforms demonstrated that the 32.2-kDa protein is an activator of transcription of granulocyte colony-stimulating factor receptor promoter, while the 14.3-kDa protein is not. Thus, C/EBPepsilon is regulated in a complex fashion and may play a role in the regulation of genes involved in myeloid differentiation.
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Affiliation(s)
- R Yamanaka
- Clinical Gene Therapy Branch, National Human Genome Research Institute, Building 10, Room 10C103, National Institutes of Health, Bethesda, MD 20892-1851, USA
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43
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Choi JK, Shen CP, Radomska HS, Eckhardt LA, Kadesch T. E47 activates the Ig-heavy chain and TdT loci in non-B cells. EMBO J 1996; 15:5014-21. [PMID: 8890174 PMCID: PMC452239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The E2A proteins, E12 and E47, are basic helix-loop-helix (bHLH) proteins essential for the B-cell lineage. Initially identified as immunoglobulin enhancer-binding proteins, they have also been shown to activate immunoglobulin enhancer-based reporters in transient transfection assays. Here, we examine the relationship between E2A DNA binding activity and activation of the endogenous, chromosomal immunoglobulin heavy chain (IgH) locus. Using sterile I(mu) transcription as an indicator of IgH enhancer activity, we see a direct correlation between E2A DNA binding activity and I(mu) transcription in stable BxT hybrids. We also observe a 1000-fold stimulation of endogenous I(mu) transcription in fibroblasts that express high levels of E47 and less stimulation in cells that express E12. By contrast, none of the other IgH enhancer-binding proteins tested (E2-2, Pu.1, Oct-2, OCA-B, TFE3 and USF) were able to activate I(mu) transcription. E47 overexpression also resulted in transcriptional activation of the endogenous gene encoding TdT, indicating that it, too, is a target of E2A proteins early in the B-cell lineage. Our results indicate that E2A proteins have the distinctive property of activating silent, chromatin-embedded B-cell-specific genes, underscoring their crucial role in B-cell development.
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Affiliation(s)
- J K Choi
- Department of Genetics and Pathology, University of Pennsylvania School of Medicine, Philadelphia 19104-6145, USA
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44
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Chen H, Zhang P, Radomska HS, Hetherington CJ, Zhang DE, Tenen DG. Octamer binding factors and their coactivator can activate the murine PU.1 (spi-1) promoter. J Biol Chem 1996; 271:15743-52. [PMID: 8663022 DOI: 10.1074/jbc.271.26.15743] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
PU.1 (spi-1), a member of the Ets transcription factor family, is predominantly expressed in myeloid and B cells, activates many B cell and myeloid genes, and is critical for development of both of these lineages. Our previous studies (Chen, H. M., Ray-Gallet, D., Zhang, P., Hetherington, C. J., Gonzalez, D. A., Zhang, D.-E., Moreau-Gachelin, F., and Tenen, D. G. (1995) Oncogene 11, 1549-1560) demonstrate that the PU.1 promoter directs cell type-specific reporter gene expression in myeloid cell lines, and that PU.1 activates its own promoter in an autoregulatory loop. Here we show that the murine PU.1 promoter is also specifically and highly functional in B cell lines as well. Oct-1 and Oct-2 can bind specifically to a site at base pair -55 in vitro, and this site is specifically protected in B cells in vivo. We also demonstrate that two other sites contribute to promoter activity in B cells; an Sp1 binding site adjacent to the octamer site, and the PU.1 autoregulatory site. Finally, we show that the B cell coactivator OBF-1/Bob1/OCA-B is only expressed in B cells and not in myeloid cells, and that OBF-1/Bob1/OCA-B can transactivate the PU.1 promoter in HeLa and myeloid cells. This B cell restricted coactivator may be responsible for the B cell specific expression of PU.1 mediated by the octamer site.
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Affiliation(s)
- H Chen
- Hematology/Oncology Division, Department of Medicine, Beth Israel Hospital, Harvard Medical School, Boston, Massachusetts 02215, USA
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45
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Abstract
We and others have been interested in the phenomenon of gene 'extinction' in somatic cell hybrids, reasoning that the study of this process is likely to reveal underlying mechanisms responsible for limiting the expression of specialized genes only to appropriate cell types. In the course of our studies in this area, we have developed a simple and economical method of fusing mammalian cells, using an electroporation device. In fusions between murine myeloma and T lymphoma lines, hybrid cell recoveries were typically one per 10(5) [corrected] input myeloma cells. Because of our interest in the regulation of immunoglobulin heavy chain (IgH) gene expression, we analyzed the hybrids for both IgH gene composition and expression. The hybrid lines were phenotypically indistinguishable from those generated by the more conventional, polyethylene glycol (PEG)-induced fusion protocol. There was a notable increase, however, in the number of hybrids that retained IgH-encoding chromosomes from both parental lines.
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Affiliation(s)
- H S Radomska
- Department of Biological Sciences, Hunter College, City University of New York, NY 10021, USA
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46
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Radomska HS, Hines MD, Eckhardt LA. Role of Oct-2 in immunoglobulin gene silencing. Ann N Y Acad Sci 1995; 764:148-50. [PMID: 7486513 DOI: 10.1111/j.1749-6632.1995.tb55817.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- H S Radomska
- Department of Biological Sciences, Hunter College, City University of New York, New York 10021, USA
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47
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Abstract
Recent experiments involving disruption of the Oct-2 gene have shown that this largely B cell-restricted transcription factor is not required in the early stages of B cell development. However, B cells that lack Oct-2 may be blocked from differentiation past the surface immunoglobulin-positive stage. To identify a possible function for Oct-2 in the late stage immunoglobulin-secreting cell, we have used the method of somatic cell fusion. When the immunoglobulin-producing myeloma MPC11 is fused to a T lymphoma, Oct-2 production ceases, as does the expression of immunoglobulin, J chain, and several other B cell-specific gene products. In the present study, we show that by preventing the loss of Oct-2 in the hybrid cells, we can preserve expression of all other tested B cell-specific genes. These results establish a central role for Oct-2 in maintaining the genetic program of the immunoglobulin-secreting plasmacyte.
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Affiliation(s)
- H S Radomska
- Department of Biological Sciences, Hunter College, City University of New York, New York 10021, USA
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