1
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Garcia A, Dunoyer-Geindre S, Fish RJ, Neerman-Arbez M, Reny JL, Fontana P. Methods to Investigate miRNA Function: Focus on Platelet Reactivity. Thromb Haemost 2020; 121:409-421. [PMID: 33124028 PMCID: PMC8263142 DOI: 10.1055/s-0040-1718730] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
MicroRNAs (miRNAs) are small noncoding RNAs modulating protein production. They are key players in regulation of cell function and are considered as biomarkers in several diseases. The identification of the proteins they regulate, and their impact on cell physiology, may delineate their role as diagnostic or prognostic markers and identify new therapeutic strategies. During the last 3 decades, development of a large panel of techniques has given rise to multiple models dedicated to the study of miRNAs. Since plasma samples are easily accessible, circulating miRNAs can be studied in clinical trials. To quantify miRNAs in numerous plasma samples, the choice of extraction and purification techniques, as well as normalization procedures, are important for comparisons of miRNA levels in populations and over time. Recent advances in bioinformatics provide tools to identify putative miRNAs targets that can then be validated with dedicated assays. In vitro and in vivo approaches aim to functionally validate candidate miRNAs from correlations and to understand their impact on cellular processes. This review describes the advantages and pitfalls of the available techniques for translational research to study miRNAs with a focus on their role in regulating platelet reactivity.
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Affiliation(s)
- Alix Garcia
- Geneva Platelet Group, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | | | - Richard J Fish
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland
| | - Marguerite Neerman-Arbez
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland.,iGE3, Institute of Genetics and Genomics in Geneva, Geneva, Switzerland
| | - Jean-Luc Reny
- Geneva Platelet Group, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Division of General Internal Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Pierre Fontana
- Geneva Platelet Group, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Division of Angiology and Haemostasis, Geneva University Hospitals, Geneva, Switzerland
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2
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Held MA, Greenfest-Allen E, Jachimowicz E, Stoeckert CJ, Stokes MP, Wood AW, Wojchowski DM. Phospho-proteomic discovery of novel signal transducers including thioredoxin-interacting protein as mediators of erythropoietin-dependent human erythropoiesis. Exp Hematol 2020; 84:29-44. [PMID: 32259549 DOI: 10.1016/j.exphem.2020.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/18/2020] [Accepted: 03/19/2020] [Indexed: 01/19/2023]
Abstract
Erythroid cell formation critically depends on signals transduced via erythropoietin (EPO)/EPO receptor (EPOR)/JAK2 complexes. This includes not only core response modules (e.g., JAK2/STAT5, RAS/MEK/ERK), but also specialized effectors (e.g., erythroferrone, ASCT2 glutamine transport, Spi2A). By using phospho-proteomics and a human erythroblastic cell model, we identify 121 new EPO target proteins, together with their EPO-modulated domains and phosphosites. Gene ontology (GO) enrichment for "Molecular Function" identified adaptor proteins as one top EPO target category. This includes a novel EPOR/JAK2-coupled network of actin assemblage modifiers, with adaptors DLG-1, DLG-3, WAS, WASL, and CD2AP as prime components. "Cellular Component" GO analysis further identified 19 new EPO-modulated cytoskeletal targets including the erythroid cytoskeletal targets spectrin A, spectrin B, adducin 2, and glycophorin C. In each, EPO-induced phosphorylation occurred at pY sites and subdomains, which suggests coordinated regulation by EPO of the erythroid cytoskeleton. GO analysis of "Biological Processes" further revealed metabolic regulators as a likewise unexpected EPO target set. Targets included aldolase A, pyruvate dehydrogenase α1, and thioredoxin-interacting protein (TXNIP), with EPO-modulated p-Y sites in each occurring within functional subdomains. In TXNIP, EPO-induced phosphorylation occurred at novel p-T349 and p-S358 sites, and was paralleled by rapid increases in TXNIP levels. In UT7epo-E and primary human stem cell (HSC)-derived erythroid progenitor cells, lentivirus-mediated short hairpin RNA knockdown studies revealed novel pro-erythropoietic roles for TXNIP. Specifically, TXNIP's knockdown sharply inhibited c-KIT expression; compromised EPO dose-dependent erythroblast proliferation and survival; and delayed late-stage erythroblast formation. Overall, new insight is provided into EPO's diverse action mechanisms and TXNIP's contributions to EPO-dependent human erythropoiesis.
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Affiliation(s)
- Matthew A Held
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH
| | | | - Edward Jachimowicz
- Molecular Medicine Department, Maine Medical Center Research Institute, Scarborough, ME
| | | | | | | | - Don M Wojchowski
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH.
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3
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Tu J, Zhang P, Shui Luk AC, Liao J, Chan WY, Qi H, Hoi-Hung AC, Lee TL. MicroRNA-26b promotes transition from Kit- to Kit+ mouse spermatogonia. Exp Cell Res 2018; 373:71-79. [DOI: 10.1016/j.yexcr.2018.09.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/07/2018] [Accepted: 09/24/2018] [Indexed: 12/22/2022]
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4
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Lee JY, Kim M, Heo HR, Ha KS, Han ET, Park WS, Yang SR, Hong SH. Inhibition of MicroRNA-221 and 222 Enhances Hematopoietic Differentiation from Human Pluripotent Stem Cells via c-KIT Upregulation. Mol Cells 2018; 41:971-978. [PMID: 30396237 PMCID: PMC6277561 DOI: 10.14348/molcells.2018.0244] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 08/27/2018] [Accepted: 10/10/2018] [Indexed: 01/01/2023] Open
Abstract
The stem cell factor (SCF)/c-KIT axis plays an important role in the hematopoietic differentiation of human pluripotent stem cells (hPSCs), but its regulatory mechanisms involving microRNAs (miRs) are not fully elucidated. Here, we demonstrated that supplementation with SCF increases the hematopoietic differentiation of hPSCs via the interaction with its receptor tyrosine kinase c-KIT, which is modulated by miR-221 and miR-222. c-KIT is comparably expressed in undifferentiated human embryonic and induced pluripotent stem cells. The inhibition of SCF signaling via treatment with a c-KIT antagonist (imatinib) during hPSC-derived hematopoiesis resulted in reductions in the yield and multi-lineage potential of hematopoietic progenitors. We found that the transcript levels of miR-221 and miR-222 targeting c-KIT were significantly lower in the pluripotent state than they were in terminally differentiated somatic cells. Furthermore, suppression of miR-221 and miR-222 in undifferentiated hPSC cultures induced more hematopoiesis by increasing c-KIT expression. Collectively, our data implied that the modulation of c-KIT by miRs may provide further potential strategies to expedite the generation of functional blood cells for therapeutic approaches and the study of the cellular machinery related to hematologic malignant diseases such as leukemia.
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Affiliation(s)
- Ji Yoon Lee
- Department of Biomedical Sciences, Stem Cell Institute, CHA University, Seongnam,
Korea
| | - MyungJoo Kim
- Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
| | - Hye-Ryeon Heo
- Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
| | - Kwon-Soo Ha
- Department of Molecular and Cellular Biochemistry, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
| | - Eun-Taek Han
- Department of Medical Environmental Biology and Tropical Medicine, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
| | - Won Sun Park
- Department of Physiology, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
| | - Se-Ran Yang
- Department of Thoracic & Cardiovascular Surgery, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
| | - Seok-Ho Hong
- Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon 24341,
Korea
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5
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Gasparello J, Fabbri E, Bianchi N, Breveglieri G, Zuccato C, Borgatti M, Gambari R, Finotti A. BCL11A mRNA Targeting by miR-210: A Possible Network Regulating γ-Globin Gene Expression. Int J Mol Sci 2017; 18:ijms18122530. [PMID: 29186860 PMCID: PMC5751133 DOI: 10.3390/ijms18122530] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 11/16/2017] [Accepted: 11/22/2017] [Indexed: 01/23/2023] Open
Abstract
The involvement of microRNAs in the control of repressors of human γ-globin gene transcription has been firmly demonstrated, as described for the miR-486-3p mediated down-regulation of BCL11A. On the other hand, we have reported that miR-210 is involved in erythroid differentiation and, possibly, in γ-globin gene up-regulation. In the present study, we have identified the coding sequence of BCL11A as a possible target of miR-210. The following results sustain this hypothesis: (a) interactions between miR-210 and the miR-210 BCL11A site were demonstrated by SPR-based biomolecular interaction analysis (BIA); (b) the miR-210 site of BCL11A is conserved through molecular evolution; (c) forced expression of miR-210 leads to decrease of BCL11A-XL and increase of γ-globin mRNA content in erythroid cells, including erythroid precursors isolated from β-thalassemia patients. Our study suggests that the coding mRNA sequence of BCL11A can be targeted by miR-210. In addition to the theoretical point of view, these data are of interest from the applied point of view, supporting a novel strategy to inhibit BCL11A by mimicking miR-210 functions, accordingly with the concept supported by several papers and patent applications that inhibition of BCL11A is an efficient strategy for fetal hemoglobin induction in the treatment of β-thalassemia.
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Affiliation(s)
- Jessica Gasparello
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
- Laboratory for the Development of Pharmacological and Pharmacogenomic Therapy of Thalassaemia, Biotechnology Center, Ferrara University, 44121 Ferrara, Italy
| | - Enrica Fabbri
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
| | - Nicoletta Bianchi
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
| | - Giulia Breveglieri
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
- Laboratory for the Development of Pharmacological and Pharmacogenomic Therapy of Thalassaemia, Biotechnology Center, Ferrara University, 44121 Ferrara, Italy
| | - Cristina Zuccato
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
| | - Monica Borgatti
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
| | - Roberto Gambari
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
- Laboratory for the Development of Pharmacological and Pharmacogenomic Therapy of Thalassaemia, Biotechnology Center, Ferrara University, 44121 Ferrara, Italy
- Correspondence: (R.G.); (A.F.); Tel.: +39-0532-974443 (R.G.); +39-0532-974510 (A.F.); Fax: +39-0532-974500 (R.G. & A.F.)
| | - Alessia Finotti
- Department of Life Sciences and Biotechnology, Ferrara University, 44121 Ferrara, Italy; (J.G.); (E.F.); (N.B.); (G.B.); (C.Z.); (M.B.)
- Laboratory for the Development of Pharmacological and Pharmacogenomic Therapy of Thalassaemia, Biotechnology Center, Ferrara University, 44121 Ferrara, Italy
- Correspondence: (R.G.); (A.F.); Tel.: +39-0532-974443 (R.G.); +39-0532-974510 (A.F.); Fax: +39-0532-974500 (R.G. & A.F.)
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6
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Diener Y, Bosio A, Bissels U. Delivery of RNA-based molecules to human hematopoietic stem and progenitor cells for modulation of gene expression. Exp Hematol 2016; 44:991-1001. [PMID: 27576131 DOI: 10.1016/j.exphem.2016.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 08/01/2016] [Accepted: 08/18/2016] [Indexed: 12/26/2022]
Abstract
Gene modulation of human hematopoietic stem and progenitor cells (HSPCs) harbors great potential for therapeutic application of these cells and presents a versatile tool in basic research to enhance our understanding of HSPC biology. However, stable genetic modification might be adverse, particularly in clinical settings. Here, we review a broad range of approaches to transient, nonviral modulation of protein expression with a focus on RNA-based methods. We compare different delivery methods and describe the usefulness of RNA molecules for overexpression as well as downregulation of proteins in HSPCs.
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Affiliation(s)
| | | | - Ute Bissels
- Miltenyi Biotec GmbH, Bergisch Gladbach, Germany.
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7
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Chaharbakhshi E, Jemc JC. Broad-complex, tramtrack, and bric-à-brac (BTB) proteins: Critical regulators of development. Genesis 2016; 54:505-518. [DOI: 10.1002/dvg.22964] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 08/08/2016] [Accepted: 08/11/2016] [Indexed: 01/21/2023]
Affiliation(s)
- Edwin Chaharbakhshi
- Department of Biology; Loyola University Chicago; Chicago IL
- Stritch School of Medicine; Loyola University Chicago; Maywood IL
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8
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Paolillo R, Spinello I, Quaranta MT, Pasquini L, Pelosi E, Lo Coco F, Testa U, Labbaye C. Human TM9SF4 Is a New Gene Down-Regulated by Hypoxia and Involved in Cell Adhesion of Leukemic Cells. PLoS One 2015; 10:e0126968. [PMID: 25961573 PMCID: PMC4427288 DOI: 10.1371/journal.pone.0126968] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 04/09/2015] [Indexed: 12/19/2022] Open
Abstract
Background The transmembrane 9 superfamily protein member 4, TM9SF4, belongs to the TM9SF family of proteins highly conserved through evolution. TM9SF4 homologs, previously identified in many different species, were mainly involved in cellular adhesion, innate immunity and phagocytosis. In human, the function and biological significance of TM9SF4 are currently under investigation. However, TM9SF4 was found overexpressed in human metastatic melanoma and in a small subset of acute myeloid leukemia (AMLs) and myelodysplastic syndromes, consistent with an oncogenic function of this gene. Purpose and Results In this study, we first analyzed the expression and regulation of TM9SF4 in normal and leukemic cells and identified TM9SF4 as a gene highly expressed in human quiescent CD34+ hematopoietic progenitor cells (HPCs), regulated during monocytic and granulocytic differentiation of HPCs, both lineages giving rise to mature myeloid cells involved in adhesion, phagocytosis and immunity. Then, we found that TM9SF4 is markedly overexpressed in leukemic cells and in AMLs, particularly in M2, M3 and M4 AMLs (i.e., in AMLs characterized by the presence of a more or less differentiated granulocytic progeny), as compared to normal CD34+ HPCs. Proliferation and differentiation of HPCs occurs in hypoxia, a physiological condition in bone marrow, but also a crucial component of cancer microenvironment. Here, we investigated the impact of hypoxia on TM9SF4 expression in leukemic cells and identified TM9SF4 as a direct target of HIF-1α, downregulated in these cells by hypoxia. Then, we found that the hypoxia-mediated downregulation of TM9SF4 expression is associated with a decrease of cell adhesion of leukemic cells to fibronectin, thus demonstrating that human TM9SF4 is a new molecule involved in leukemic cell adhesion. Conclusions Altogether, our study reports for the first time the expression of TM9SF4 at the level of normal and leukemic hematopoietic cells and its marked expression at the level of AMLs displaying granulocytic differentiation.
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MESH Headings
- Apoptosis/drug effects
- Bone Marrow Cells/drug effects
- Bone Marrow Cells/metabolism
- Bone Marrow Cells/pathology
- Cell Adhesion/drug effects
- Cell Cycle/drug effects
- Cell Differentiation/drug effects
- Cell Hypoxia
- Cell Proliferation/drug effects
- Cloning, Molecular
- Fibronectins/metabolism
- Gene Expression Regulation, Leukemic
- Granulocytes/drug effects
- Granulocytes/metabolism
- Granulocytes/pathology
- HEK293 Cells
- Hematopoietic Stem Cells/drug effects
- Hematopoietic Stem Cells/metabolism
- Hematopoietic Stem Cells/pathology
- Humans
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/metabolism
- Leukemia, Myeloid, Acute/pathology
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Monocytes/drug effects
- Monocytes/metabolism
- Monocytes/pathology
- Neoplasm Proteins/genetics
- Neoplasm Proteins/metabolism
- Oxygen/pharmacology
- Primary Cell Culture
- Promoter Regions, Genetic
- Signal Transduction
- Tumor Cells, Cultured
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Affiliation(s)
- Rosa Paolillo
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Isabella Spinello
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Maria Teresa Quaranta
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Luca Pasquini
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Elvira Pelosi
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Francesco Lo Coco
- Department of Biomedicine and Prevention, University of Rome “Tor Vergata”, Rome, Italy
- Fondazione Santa Lucia, Rome, Italy
| | - Ugo Testa
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
| | - Catherine Labbaye
- Department of Hematology, Oncology and Molecular Medicine of Istituto Superiore di Sanità, 00161, Rome, Italy
- * E-mail:
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9
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Bianchi N, Finotti A, Ferracin M, Lampronti I, Zuccato C, Breveglieri G, Brognara E, Fabbri E, Borgatti M, Negrini M, Gambari R. Increase of microRNA-210, decrease of raptor gene expression and alteration of mammalian target of rapamycin regulated proteins following mithramycin treatment of human erythroid cells. PLoS One 2015; 10:e0121567. [PMID: 25849663 PMCID: PMC4388523 DOI: 10.1371/journal.pone.0121567] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 02/13/2015] [Indexed: 02/04/2023] Open
Abstract
Expression and regulation of microRNAs is an emerging issue in erythroid differentiation and globin gene expression in hemoglobin disorders. In the first part of this study microarray analysis was performed both in mithramycin-induced K562 cells and erythroid precursors from healthy subjects or β-thalassemia patients producing low or high levels of fetal hemoglobin. We demonstrated that: (a) microRNA-210 expression is higher in erythroid precursors from β-thalassemia patients with high production of fetal hemoglobin; (b) microRNA-210 increases as a consequence of mithramycin treatment of K562 cells and human erythroid progenitors both from healthy and β-thalassemia subjects; (c) this increase is associated with erythroid induction and elevated expression of γ-globin genes; (d) an anti-microRNA against microRNA-210 interferes with the mithramycin-induced changes of gene expression. In the second part of the study we have obtained convergent evidences suggesting raptor mRNA as a putative target of microRNA-210. Indeed, microRNA-210 binding sites of its 3’-UTR region were involved in expression and are targets of microRNA-210-mediated modulation in a luciferase reporter assays. Furthermore, (i) raptor mRNA and protein are down-regulated upon mithramycin-induction both in K562 cells and erythroid progenitors from healthy and β-thalassemia subjects. In addition, (ii) administration of anti-microRNA-210 to K562 cells decreased endogenous microRNA-210 and increased raptor mRNA and protein expression. Finally, (iii) treatment of K562 cells with premicroRNA-210 led to a decrease of raptor mRNA and protein. In conclusion, microRNA-210 and raptor are involved in mithramycin-mediated erythroid differentiation of K562 cells and participate to the fine-tuning and control of γ-globin gene expression in erythroid precursor cells.
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Affiliation(s)
- Nicoletta Bianchi
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Alessia Finotti
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
- Laboratory for the Development of Pharmacological and Pharmacogenomic Therapy of Thalassaemia, Biotechnology Center, Ferrara University, Ferrara, Italy
| | - Manuela Ferracin
- Department of Morphology, Surgery and Experimental Medicine, Ferrara University, Ferrara, Italy
- Laboratory for Technologies of Advanced Therapies (LTTA), Ferrara University, Ferrara, Italy
| | - Ilaria Lampronti
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Cristina Zuccato
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Giulia Breveglieri
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Eleonora Brognara
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Enrica Fabbri
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Monica Borgatti
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
| | - Massimo Negrini
- Department of Morphology, Surgery and Experimental Medicine, Ferrara University, Ferrara, Italy
- Laboratory for Technologies of Advanced Therapies (LTTA), Ferrara University, Ferrara, Italy
| | - Roberto Gambari
- Department of Life Sciences and Biotechnology, Ferrara University, Ferrara, Italy
- Laboratory for the Development of Pharmacological and Pharmacogenomic Therapy of Thalassaemia, Biotechnology Center, Ferrara University, Ferrara, Italy
- * E-mail:
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10
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Yosypiv IV. Renin-angiotensin system in ureteric bud branching morphogenesis: implications for kidney disease. Pediatr Nephrol 2014; 29:609-20. [PMID: 24061643 DOI: 10.1007/s00467-013-2616-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 08/20/2013] [Accepted: 08/21/2013] [Indexed: 12/26/2022]
Abstract
Failure of normal branching morphogenesis of the ureteric bud (UB), a key ontogenic process that controls organogenesis of the metanephric kidney, leads to congenital anomalies of the kidney and urinary tract (CAKUT), the leading cause of end-stage kidney disease in children. Recent studies have revealed a central role of the renin-angiotensin system (RAS), the cardinal regulator of blood pressure and fluid/electrolyte homeostasis, in the control of normal kidney development. Mice or humans with mutations in the RAS genes exhibit a spectrum of CAKUT which includes renal medullary hypoplasia, hydronephrosis, renal hypodysplasia, duplicated renal collecting system and renal tubular dysgenesis. Emerging evidence indicates that severe hypoplasia of the inner medulla and papilla observed in angiotensinogen (Agt)- or angiotensin (Ang) II AT 1 receptor (AT 1 R)-deficient mice is due to aberrant UB branching morphogenesis resulting from disrupted RAS signaling. Lack of the prorenin receptor (PRR) in the UB in mice causes reduced UB branching, resulting in decreased nephron endowment, marked kidney hypoplasia, urinary concentrating and acidification defects. This review provides a mechanistic rational supporting the hypothesis that aberrant signaling of the intrarenal RAS during distinct stages of metanephric kidney development contributes to the pathogenesis of the broad phenotypic spectrum of CAKUT. As aberrant RAS signaling impairs normal renal development, these findings advocate caution for the use of RAS inhibitors in early infancy and further underscore a need to avoid their use during pregnancy and to identify the types of molecular processes that can be targeted for clinical intervention.
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Affiliation(s)
- Ihor V Yosypiv
- Section of Pediatric Nephrology, Department of Pediatrics, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, 1430 Tulane Avenue, New Orleans, LA, 70112, USA,
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11
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Shirakawa T, Yaman-Deveci R, Tomizawa SI, Kamizato Y, Nakajima K, Sone H, Sato Y, Sharif J, Yamashita A, Takada-Horisawa Y, Yoshida S, Ura K, Muto M, Koseki H, Suda T, Ohbo K. An epigenetic switch is crucial for spermatogonia to exit the undifferentiated state toward a Kit-positive identity. Development 2013; 140:3565-76. [PMID: 23903187 DOI: 10.1242/dev.094045] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Epigenetic modifications influence gene expression and chromatin remodeling. In embryonic pluripotent stem cells, these epigenetic modifications have been extensively characterized; by contrast, the epigenetic events of tissue-specific stem cells are poorly understood. Here, we define a new epigenetic shift that is crucial for differentiation of murine spermatogonia toward meiosis. We have exploited a property of incomplete cytokinesis, which causes male germ cells to form aligned chains of characteristic lengths, as they divide and differentiate. These chains revealed the stage of spermatogenesis, so the epigenetic differences of various stages could be characterized. Single, paired and medium chain-length spermatogonia not expressing Kit (a marker of differentiating spermatogonia) showed no expression of Dnmt3a2 and Dnmt3b (two de novo DNA methyltransferases); they also lacked the transcriptionally repressive histone modification H3K9me2. By contrast, spermatogonia consisting of ~8-16 chained cells with Kit expression dramatically upregulated Dnmt3a2/3b expression and also displayed increased H3K9me2 modification. To explore the function of these epigenetic changes in spermatogonia in vivo, the DNA methylation machinery was destabilized by ectopic Dnmt3b expression or Np95 ablation. Forced Dnmt3b expression induced expression of Kit; whereas ablation of Np95, which is essential for maintaining DNA methylation, interfered with differentiation and viability only after spermatogonia become Kit positive. These data suggest that the epigenetic status of spermatogonia shifts dramatically during the Kit-negative to Kit-positive transition. This shift might serve as a switch that determines whether spermatogonia self-renew or differentiate.
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Affiliation(s)
- Takayuki Shirakawa
- Department of Histology and Cell Biology, Yokohama City University School of Medicine, Yokohama, Japan
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12
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8-CPT-cAMP/all-trans retinoic acid targets t(11;17) acute promyelocytic leukemia through enhanced cell differentiation and PLZF/RARα degradation. Proc Natl Acad Sci U S A 2013; 110:3495-500. [PMID: 23382200 DOI: 10.1073/pnas.1222863110] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The refractoriness of acute promyelocytic leukemia (APL) with t(11;17)(q23;q21) to all-trans retinoic acid (ATRA)-based therapy concerns clinicians and intrigues basic researchers. By using a murine leukemic model carrying both promyelocytic leukemia zinc finger/retinoic acid receptor-α (PLZF/RARα) and RARα/PLZF fusion genes, we discovered that 8-chlorophenylthio adenosine-3', 5'-cyclic monophosphate (8-CPT-cAMP) enhances cellular differentiation and improves gene trans-activation by ATRA in leukemic blasts. Mechanistically, in combination with ATRA, 8-CPT-cAMP activates PKA, causing phosphorylation of PLZF/RARα at Ser765 and resulting in increased dissociation of the silencing mediator for retinoic acid and thyroid hormone receptors/nuclear receptor corepressor from PLZF/RARα. This process results in changes of local chromatin and transcriptional reactivation of the retinoic acid pathway in leukemic cells. Meanwhile, 8-CPT-cAMP also potentiated ATRA-induced degradation of PLZF/RARα through its Ser765 phosphorylation. In vivo treatment of the t(11;17) APL mouse model demonstrated that 8-CPT-cAMP could significantly improve the therapeutic effect of ATRA by targeting a leukemia-initiating cell activity. This combined therapy, which induces enhanced differentiation and oncoprotein degradation, may benefit t(11;17) APL patients.
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Local bone marrow renin-angiotensin system in primitive, definitive and neoplastic haematopoiesis. Clin Sci (Lond) 2013; 124:307-23. [PMID: 23157407 DOI: 10.1042/cs20120300] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The locally active ligand peptides, mediators, receptors and signalling pathways of the haematopoietic BM (bone marrow) autocrine/paracrine RAS (renin-angiotensin system) affect the essential steps of definitive blood cell production. Haematopoiesis, erythropoiesis, myelopoiesis, formation of monocytic and lymphocytic lineages, thrombopoiesis and other stromal cellular elements are regulated by the local BM RAS. The local BM RAS is present and active even in primitive embryonic haematopoiesis. ACE (angiotensin-converting enzyme) is expressed on the surface of the first endothelial and haematopoietic cells, forming the marrow cavity in the embryo. ACE marks early haematopoietic precursor cells and long-term blood-forming CD34(+) BM cells. The local autocrine tissue BM RAS may also be active in neoplastic haematopoiesis. Critical RAS mediators such as renin, ACE, AngII (angiotensin II) and angiotensinogen have been identified in leukaemic blast cells. The local tissue RAS influences tumour growth and metastases in an autocrine and paracrine fashion via the modulation of numerous carcinogenic events, such as angiogenesis, apoptosis, cellular proliferation, immune responses, cell signalling and extracellular matrix formation. The aim of the present review is to outline the known functions of the local BM RAS within the context of primitive, definitive and neoplastic haematopoiesis. Targeting the actions of local RAS molecules could represent a valuable therapeutic option for the management of neoplastic disorders.
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Yang QE, Racicot KE, Kaucher AV, Oatley MJ, Oatley JM. MicroRNAs 221 and 222 regulate the undifferentiated state in mammalian male germ cells. Development 2012; 140:280-90. [PMID: 23221369 DOI: 10.1242/dev.087403] [Citation(s) in RCA: 121] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Continuity of cycling cell lineages relies on the activities of undifferentiated stem cell-containing subpopulations. Transition to a differentiating state must occur periodically in a fraction of the population to supply mature cells, coincident with maintenance of the undifferentiated state in others to sustain a foundational stem cell pool. At present, molecular mechanisms regulating these activities are poorly defined for most cell lineages. Spermatogenesis is a model process that is supported by an undifferentiated spermatogonial population and transition to a differentiating state involves attained expression of the KIT receptor. We found that impaired function of the X chromosome-clustered microRNAs 221 and 222 (miR-221/222) in mouse undifferentiated spermatogonia induces transition from a KIT(-) to a KIT(+) state and loss of stem cell capacity to regenerate spermatogenesis. Both Kit mRNA and KIT protein abundance are influenced by miR-221/222 function in spermatogonia. Growth factors that promote maintenance of undifferentiated spermatogonia upregulate miR-221/222 expression; whereas exposure to retinoic acid, an inducer of spermatogonial differentiation, downregulates miR-221/222 abundance. Furthermore, undifferentiated spermatogonia overexpressing miR-221/222 are resistant to retinoic acid-induced transition to a KIT(+) state and are incapable of differentiation in vivo. These findings indicate that miR-221/222 plays a crucial role in maintaining the undifferentiated state of mammalian spermatogonia through repression of KIT expression.
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Affiliation(s)
- Qi-En Yang
- School of Molecular Biosciences, Center for Reproductive Biology, College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA
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15
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Jeon YK, Go H, Nam SJ, Keam B, Kim TM, Jung KC, Kang HJ, Lee DS, Huh JR, Park SH. Expression of the promyelocytic leukemia zinc-finger in T-lymphoblastic lymphoma and leukemia has strong implications for their cellular origin and greater association with initial bone marrow involvement. Mod Pathol 2012; 25:1236-45. [PMID: 22555178 DOI: 10.1038/modpathol.2012.82] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The promyelocytic leukemia zinc-finger (PLZF) is essential for the development of innate T cells (as represented by natural killer T cells) for acquisition of their unique innate immune properties. We evaluated the PLZF protein expression in a variety of immature and mature lymphoid malignancies. PLZF was preferentially expressed in T-lymphoblastic lymphoma/acute lymphoblastic leukemia (T-LBL/ALL) in 50% of the 54 cases. Among 51 cases of peripheral T-cell lymphoma not otherwise specified, only one (2%) expressed PLZF. One mycosis fungoides case expressed PLZF in lymph node involved by tumor. Otherwise, PLZF was not detected in any other type of lymphoma. In T-LBL/ALL, PLZF expression was more common in CD4/CD8 double-negative (67%) or CD8 single-positive subtypes (73%) than in CD4/CD8 double-positive (13%) and CD4 single-positive subtypes (0%) (P=0.001). Importantly, PLZF and CD1a expression were mutually exclusive in T-LBL/ALL (P=0.001). This was also the case for T-cell receptor βF1 expression (P=0.000). Most (96%) of the PLZF-positive T-LBL/ALL cases showed initial bone marrow involvement compared with 39% of PLZF-negative cases (P=0.000). Based on these findings, we suggest that T-LBL/ALLs that express PLZF arise from early immature double-negative thymocytes when the T-cell receptor β chain has not yet expressed or innate T-cell precursors, and strongly imply bone marrow involvement.
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Affiliation(s)
- Yoon K Jeon
- Department of Pathology, Seoul National University Hospital, Seoul, South Korea.
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Mayoral RJ, Deho L, Rusca N, Bartonicek N, Saini HK, Enright AJ, Monticelli S. MiR-221 influences effector functions and actin cytoskeleton in mast cells. PLoS One 2011; 6:e26133. [PMID: 22022537 PMCID: PMC3192147 DOI: 10.1371/journal.pone.0026133] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Accepted: 09/20/2011] [Indexed: 02/01/2023] Open
Abstract
Mast cells have essential effector and immunoregulatory functions in IgE-associated allergic disorders and certain innate and adaptive immune responses, but the role of miRNAs in regulating mast cell functions is almost completely unexplored. To examine the role of the activation-induced miRNA miR-221 in mouse mast cells, we developed robust lentiviral systems for miRNA overexpression and depletion. While miR-221 favored mast cell adhesion and migration towards SCF or antigen in trans-well migration assays, as well as cytokine production and degranulation in response to IgE-antigen complexes, neither miR-221 overexpression, nor its ablation, interfered with mast cell differentiation. Transcriptional profiling of miR-221-overexpressing mast cells revealed modulation of many transcripts, including several associated with the cytoskeleton; indeed, miR-221 overexpression was associated with reproducible increases in cortical actin in mast cells, and with altered cellular shape and cell cycle in murine fibroblasts. Our bioinformatics analysis showed that this effect was likely mediated by the composite effect of miR-221 on many primary and secondary targets in resting cells. Indeed, miR-221-induced cellular alterations could not be recapitulated by knockdown of one of the major targets of miR-221. We propose a model in which miR-221 has two different roles in mast cells: in resting cells, basal levels of miR-221 contribute to the regulation of the cell cycle and cytoskeleton, a general mechanism probably common to other miR-221-expressing cell types, such as fibroblasts. Vice versa, upon induction in response to mast cell stimulation, miR-221 effects are mast cell-specific and activation-dependent, contributing to the regulation of degranulation, cytokine production and cell adherence. Our studies provide new insights into the roles of miR-221 in mast cell biology, and identify novel mechanisms that may contribute to mast cell-related pathological conditions, such as asthma, allergy and mastocytosis.
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Affiliation(s)
| | - Lorenzo Deho
- Institute for Research in Biomedicine, Bellinzona, Switzerland
| | - Nicole Rusca
- Institute for Research in Biomedicine, Bellinzona, Switzerland
| | - Nenad Bartonicek
- EMBL - European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - Harpreet Kaur Saini
- EMBL - European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - Anton J. Enright
- EMBL - European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - Silvia Monticelli
- Institute for Research in Biomedicine, Bellinzona, Switzerland
- * E-mail:
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MicroRNA-146a and AMD3100, two ways to control CXCR4 expression in acute myeloid leukemias. Blood Cancer J 2011; 1:e26. [PMID: 22829170 PMCID: PMC3255264 DOI: 10.1038/bcj.2011.24] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Accepted: 05/12/2011] [Indexed: 12/30/2022] Open
Abstract
CXCR4 is a negative prognostic marker in acute myeloid leukemias (AMLs). Therefore, it is necessary to develop novel ways to inhibit CXCR4 expression in leukemia. AMD3100 is an inhibitor of CXCR4 currently used to mobilize cancer cells. CXCR4 is a target of microRNA (miR)-146a that may represent a new tool to inhibit CXCR4 expression. We then investigated CXCR4 regulation by miR-146a in primary AMLs and found an inverse correlation between miR-146a and CXCR4 protein expression levels in all AML subtypes. As the lowest miR-146a expression levels were observed in M5 AML, we analyzed the control of CXCR4 expression by miR-146a in normal and leukemic monocytic cells and showed that the regulatory miR-146a/CXCR4 pathway operates during monocytopoiesis, but is deregulated in AMLs. AMD3100 treatment and miR-146a overexpression were used to inhibit CXCR4 in leukemic cells. AMD3100 treatment induces the decrease of CXCR4 protein expression, associated with miR-146a increase, and increases sensitivity of leukemic blast cells to cytotoxic drugs, this effect being further enhanced by miR-146a overexpression. Altogether our data indicate that miR-146a and AMD3100, acting through different mechanism, downmodulate CXCR4 protein levels, impair leukemic cell proliferation and then may be used in combination with anti-leukemia drugs, for development of new therapeutic strategies.
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Song R, Yosypiv IV. (Pro)renin Receptor in Kidney Development and Disease. Int J Nephrol 2011; 2011:247048. [PMID: 21755055 PMCID: PMC3132641 DOI: 10.4061/2011/247048] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2011] [Revised: 03/20/2011] [Accepted: 04/20/2011] [Indexed: 12/24/2022] Open
Abstract
The renin-angiotensin system (RAS), a key regulator of the blood pressure and fluid/electrolyte homeostasis, also plays a critical role in kidney development. All the components of the RAS are expressed in the developing metanephros. Moreover, mutations in the genes encoding components of the RAS in mice or humans are associated with a broad spectrum of congenital anomalies of the kidney and urinary tract (CAKUT). These forms of CAKUT include renal papillary hypoplasia, hydronephrosis, duplicated collecting system, renal tubular dysgenesis, renal vascular abnormalities, and aberrant glomerulogenesis. Emerging evidence indicates that (pro)renin receptor (PRR), a novel component of the RAS, is essential for proper kidney development and that aberrant PRR signaling is causally linked to cardiovascular and renal disease. This paper describes the role of the RAS in kidney development and highlights emerging insights into the cellular and molecular mechanisms by which the PRR may regulate this critical morphogenetic process.
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Affiliation(s)
- Renfang Song
- Section of Pediatric Nephrology, Department of Pediatrics, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, 1430 Tulane Avenue, New Orleans, LA 70112, USA
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Ozaki Y, Saito K, Shinya M, Kawasaki T, Sakai N. Evaluation of Sycp3, Plzf and Cyclin B3 expression and suitability as spermatogonia and spermatocyte markers in zebrafish. Gene Expr Patterns 2011; 11:309-15. [PMID: 21402175 DOI: 10.1016/j.gep.2011.03.002] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 02/28/2011] [Accepted: 03/02/2011] [Indexed: 10/18/2022]
Abstract
Recent studies in mammals have revealed the heterogeneity of spermatogonial populations which contain differentiated and undifferentiated cells that further divide into actual stem cells and potential stem cells. In fish however, there are no functional definitions, and very few molecular markers, for germ cells. In our present study, specific antibodies were raised against Sycp3, Plzf and Cyclin B3 in zebrafish and then used to determine the localization of these proteins in the testis. We wished to confirm whether these molecules were potential markers for spermatocytes and spermatogonia. Immunohistochemical observations revealed that Sycp3 is specifically localized in spermatocytes in typical nuclear patterns at each meiotic stage. Plzf was found to be localized in the nucleus of both type A and type B spermatogonia until the 8-cell clone, similar to the pattern in Plzf-positive A(single)-A(aligned) undifferentiated spermatogonia in rodents. In addition to Plzf, the localization of Cyclin B3 was predominantly detected in the nuclei of type A and early type B spermatogonia until the 16-cell clone. Additionally, Cyclin B3 protein signals were detected in germ cells in large cysts, possibly corresponding to spermatocytes at the preleptotene stage. Our present data thus show that these molecules have properties that will enable their use as markers of spermatocytes and early spermatogonia in zebrafish.
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Affiliation(s)
- Yuichi Ozaki
- Genetic Strains Research Center, National Institute of Genetics, Mishima 411-8540, Japan
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20
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Role of stem cell factor in the reactivation of human fetal hemoglobin. Mediterr J Hematol Infect Dis 2009; 1:e2009009. [PMID: 21415991 PMCID: PMC3033162 DOI: 10.4084/mjhid.2009.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2009] [Accepted: 11/11/2009] [Indexed: 12/12/2022] Open
Abstract
In humans the switch from fetal to adult hemoglobin (HbF → HbA) takes place in the perinatal and postnatal period, determining the progressive replacement of HbF with HbA synthesis (i.e., the relative HbF content in red blood cells decreases from 80–90% to <1%). In spite of more than twenty years of intensive investigations on this classic model, the molecular mechanisms regulating the Hb switching, as well as HbF synthesis in adults, has been only in part elucidated. In adult life, the residual HbF, restricted to F cell compartment, may be reactivated up to 10–20% of total Hb synthesis in various conditions associated with “stress erythropoiesis”: this reactivation represented until now an interesting model of partial Hb switch reverse with important therapeutic implications in patients with hemoglobinopathies, and particularly in β-thalassemia. In vitro and in vivo models have led to the identification of several chemical compounds able to reactivate HbF synthesis in adult erythroid cells. Although the impact of these HbF inducers, including hypomethylating agents, histone deacetylase inhibitors and hydroxyurea, was clear on the natural history of sickle cell anemia, the benefit on the clinical course of β-thalassemia was only limited: particularly, the toxicity and the modest increase in γ-globin reactivation indicated the need for improved agents able to induce higher levels of HbF. In the present review we describe the biologic properties of Stem Cell Factor (SCF), a cytokine sustaining the survival and proliferation of erythroid cells, that at pharmacological doses acts as a potent stimulator of HbF synthesis in adult erythroid cells.
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Abstract
MicroRNAs are a recently discovered class of small (c. 22 nt) naturally occurring non-coding RNA molecules that regulate gene expression through binding to the un-translated region of target mRNA. MicroRNAs play key roles in many cellular pathways including haematopoiesis and aberrant expression is a common feature of haematological malignancies. Whilst other areas of haematopoiesis have been extensively reviewed the involvement of microRNAs in red cell production (erythropoiesis) and disorders of this pathway is lacking. In this review the rapidly accumulating evidence that points to the major role microRNAs play in both erythropoiesis and erythroid disorders is discussed.
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Affiliation(s)
- Charles H Lawrie
- Lymphoid Malignancy Research Group, Nuffield Department of Clinical Laboratory Sciences, University of Oxford, John Radcliffe Hospital, Oxford, UK.
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Mithraprabhu S, Loveland KL. Control of KIT signalling in male germ cells: what can we learn from other systems? Reproduction 2009; 138:743-57. [PMID: 19567460 DOI: 10.1530/rep-08-0537] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The KIT ligand (KITL)/KIT-signalling system is among several pathways known to be essential for fertility. In the postnatal testis, the KIT/KITL interaction is crucial for spermatogonial proliferation, differentiation, survival and subsequent entry into meiosis. Hence, identification of endogenous factors that regulate KIT synthesis is important for understanding the triggers driving germ cell maturation. Although limited information is available regarding local factors in the testicular microenvironment that modulate KIT synthesis at the onset of spermatogenesis, knowledge from other systems could be used as a basis for identifying how KIT function is regulated in germ cells. This review describes the known regulators of KIT, including transcription factors implicated in KIT promoter regulation. In addition, specific downstream outcomes in biological processes that KIT orchestrates are addressed. These are discussed in relationship to current knowledge of mammalian germ cell development.
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Affiliation(s)
- Sridurga Mithraprabhu
- Monash Institute for Medical Research, Monash University, Clayton, Victoria, Australia
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Pelosi E, Labbaye C, Testa U. MicroRNAs in normal and malignant myelopoiesis. Leuk Res 2009; 33:1584-93. [PMID: 19482355 DOI: 10.1016/j.leukres.2009.04.039] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Revised: 04/27/2009] [Accepted: 04/28/2009] [Indexed: 12/22/2022]
Abstract
MicroRNAs (miRNAs) are a class of non-coding protein, single-stranded RNA of 18-22 nucleotides, that exert their actions at post-transcriptional level, mostly through base pairing with the 3'-untranslated region of the target mRNA, thus leading to its translational repression and/or degradation. Recent studies have shown that miRNAs play a crucial role in normal hematopoiesis through the control of the expression of key regulators of hematopoiesis (i.e., transcription factors, growth factor receptors, chemokine receptors), involving regulatory loops that selectively operate in the various hematopoietic lineages. Extensive miRNA deregulation has been observed in leukemia and functional studies support a role for miRNAs in the pathogenesis of these disorders.
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Affiliation(s)
- Elvira Pelosi
- Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
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