1
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Cacialli P, Dogan S, Linnerz T, Pasche C, Bertrand JY. Minichromosome maintenance protein 10 (mcm10) regulates hematopoietic stem cell emergence in the zebrafish embryo. Stem Cell Reports 2023; 18:1534-1546. [PMID: 37437546 PMCID: PMC10362509 DOI: 10.1016/j.stemcr.2023.05.022] [Citation(s) in RCA: 2] [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: 11/09/2022] [Revised: 05/30/2023] [Accepted: 05/31/2023] [Indexed: 07/14/2023] Open
Abstract
Hematopoietic stem cells (HSCs) guarantee the continuous supply of all blood lineages during life. In response to stress, HSCs are capable of extensive proliferative expansion, whereas in steady state, HSCs largely remain in a quiescent state to prevent their exhaustion. DNA replication is a very complex process, where many factors need to exert their functions in a perfectly concerted manner. Mini-chromosome-maintenance protein 10 (Mcm10) is an important replication factor, required for proper assembly of the eukaryotic replication fork. In this report, we use zebrafish to study the role of mcm10 during embryonic development, and we show that mcm10 specifically regulates HSC emergence from the hemogenic endothelium. We demonstrate that mcm10-deficient embryos present an accumulation of DNA damages in nascent HSCs, inducing their apoptosis. This phenotype can be rescued by knocking down p53. Taken all together, our results show that mcm10 plays an important role in the emergence of definitive hematopoiesis.
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Affiliation(s)
- Pietro Cacialli
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland
| | - Serkan Dogan
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; McMaster University, Faculty of Sciences, Department of Biology, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada
| | - Tanja Linnerz
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; University of Auckland, Faculty of Medical and Health Sciences, Department of Molecular Medicine and Pathology, 85 Park Road, 1023 Auckland, New Zealand
| | - Corentin Pasche
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland
| | - Julien Y Bertrand
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; Geneva Centre for Inflammation Research, Faculty of Medicine, University of Geneva, Geneva, Switzerland.
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2
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Cacialli P, Mailhe MP, Wagner I, Merkler D, Golub R, Bertrand JY. Synergistic prostaglandin E synthesis by myeloid and endothelial cells promotes fetal hematopoietic stem cell expansion in vertebrates. EMBO J 2022; 41:e108536. [PMID: 35924455 PMCID: PMC9531293 DOI: 10.15252/embj.2021108536] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 07/13/2022] [Accepted: 07/14/2022] [Indexed: 11/21/2022] Open
Abstract
During development, hematopoietic stem cells (HSCs) are produced from the hemogenic endothelium and will expand in a transient hematopoietic niche. Prostaglandin E2 (PGE2) is essential during vertebrate development and HSC specification, but its precise source in the embryo remains elusive. Here, we show that in the zebrafish embryo, PGE2 synthesis genes are expressed by distinct stromal cell populations, myeloid (neutrophils, macrophages), and endothelial cells of the caudal hematopoietic tissue. Ablation of myeloid cells, which produce the PGE2 precursor prostaglandin H2 (PGH2), results in loss of HSCs in the caudal hematopoietic tissue, which could be rescued by exogeneous PGE2 or PGH2 supplementation. Endothelial cells contribute by expressing the PGH2 import transporter slco2b1 and ptges3, the enzyme converting PGH2 into PGE2. Of note, differential niche cell expression of PGE2 biosynthesis enzymes is also observed in the mouse fetal liver. Taken altogether, our data suggest that the triad composed of neutrophils, macrophages, and endothelial cells sequentially and synergistically contributes to blood stem cell expansion during vertebrate development.
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Affiliation(s)
- Pietro Cacialli
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva 4, Switzerland
| | | | - Ingrid Wagner
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva 4, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva 4, Switzerland.,Division of Clinical Pathology, Department of Diagnostic, University Hospitals of Geneva, Geneva, Switzerland
| | - Rachel Golub
- Unité Lymphocytes et Immunité, Pasteur Institute, Paris Cedex 15, France.,Université de Paris, Paris, France
| | - Julien Y Bertrand
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva 4, Switzerland
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3
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Kraus JM, Giovannone D, Rydzik R, Balsbaugh JL, Moss IL, Schwedler JL, Bertrand JY, Traver D, Hankenson KD, Crump JG, Youngstrom DW. Notch signaling enhances bone regeneration in the zebrafish mandible. Development 2022; 149:dev199995. [PMID: 35178545 PMCID: PMC8959151 DOI: 10.1242/dev.199995] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 01/21/2022] [Indexed: 12/12/2022]
Abstract
Loss or damage to the mandible caused by trauma, treatment of oral malignancies, and other diseases is treated using bone-grafting techniques that suffer from numerous shortcomings and contraindications. Zebrafish naturally heal large injuries to mandibular bone, offering an opportunity to understand how to boost intrinsic healing potential. Using a novel her6:mCherry Notch reporter, we show that canonical Notch signaling is induced during the initial stages of cartilage callus formation in both mesenchymal cells and chondrocytes following surgical mandibulectomy. We also show that modulation of Notch signaling during the initial post-operative period results in lasting changes to regenerate bone quantity one month later. Pharmacological inhibition of Notch signaling reduces the size of the cartilage callus and delays its conversion into bone, resulting in non-union. Conversely, conditional transgenic activation of Notch signaling accelerates conversion of the cartilage callus into bone, improving bone healing. Given the conserved functions of this pathway in bone repair across vertebrates, we propose that targeted activation of Notch signaling during the early phases of bone healing in mammals may both augment the size of the initial callus and boost its ossification into reparative bone.
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Affiliation(s)
- Jessica M. Kraus
- Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT 06030, USA
| | - Dion Giovannone
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, CA 90033, USA
| | - Renata Rydzik
- Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT 06030, USA
| | - Jeremy L. Balsbaugh
- Proteomics & Metabolomics Facility, Center for Open Research Resources & Equipment, University of Connecticut, Storrs, CT 06269, USA
| | - Isaac L. Moss
- Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT 06030, USA
| | - Jennifer L. Schwedler
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA 92093, USA
| | - Julien Y. Bertrand
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA 92093, USA
| | - David Traver
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA 92093, USA
| | - Kurt D. Hankenson
- Department of Orthopaedic Surgery, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - J. Gage Crump
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, CA 90033, USA
| | - Daniel W. Youngstrom
- Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT 06030, USA
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4
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Ferrero G, Gomez E, Lyer S, Rovira M, Miserocchi M, Langenau DM, Bertrand JY, Wittamer V. The macrophage-expressed gene (mpeg) 1 identifies a subpopulation of B cells in the adult zebrafish. J Leukoc Biol 2020; 107:431-443. [PMID: 31909502 PMCID: PMC7064944 DOI: 10.1002/jlb.1a1119-223r] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [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: 07/05/2019] [Revised: 11/07/2019] [Accepted: 11/26/2019] [Indexed: 12/12/2022] Open
Abstract
The mononuclear phagocytic system consists of many cells, in particular macrophages, scattered throughout the body. However, there is increasing evidence for the heterogeneity of tissue-resident macrophages, leading to a pressing need for new tools to discriminate mononuclear phagocytic system subsets from other hematopoietic lineages. Macrophage-expressed gene (Mpeg)1.1 is an evolutionary conserved gene encoding perforin-2, a pore-forming protein associated with host defense against pathogens. Zebrafish mpeg1.1:GFP and mpeg1.1:mCherry reporters were originally established to specifically label macrophages. Since then more than 100 peer-reviewed publications have made use of mpeg1.1-driven transgenics for in vivo studies, providing new insights into key aspects of macrophage ontogeny, activation, and function. Whereas the macrophage-specific expression pattern of the mpeg1.1 promoter has been firmly established in the zebrafish embryo, it is currently not known whether this specificity is maintained through adulthood. Here we report direct evidence that beside macrophages, a subpopulation of B-lymphocytes is marked by mpeg1.1 reporters in most adult zebrafish organs. These mpeg1.1+ lymphoid cells endogenously express mpeg1.1 and can be separated from mpeg1.1+ macrophages by virtue of their light-scatter characteristics using FACS. Remarkably, our analyses also revealed that B-lymphocytes, rather than mononuclear phagocytes, constitute the main mpeg1.1-positive population in irf8null myeloid-defective mutants, which were previously reported to recover tissue-resident macrophages in adulthood. One notable exception is skin macrophages, whose development and maintenance appear to be independent from irf8, similar to mammals. Collectively, our findings demonstrate that irf8 functions in myelopoiesis are evolutionary conserved and highlight the need for alternative macrophage-specific markers to study the mononuclear phagocytic system in adult zebrafish.
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Affiliation(s)
- Giuliano Ferrero
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium.,ULB Institute of Neuroscience (UNI), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Etienne Gomez
- Department of Pathology and Immunology, University of Geneva, School of Medicine, Geneva, Switzerland
| | - Sowmya Lyer
- Department of Pathology and Center for Cancer Research, Massachusetts General Hospital Research Institute, Boston, Massachusetts, USA
| | - Mireia Rovira
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium.,ULB Institute of Neuroscience (UNI), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Magali Miserocchi
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium.,ULB Institute of Neuroscience (UNI), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - David M Langenau
- Department of Pathology and Center for Cancer Research, Massachusetts General Hospital Research Institute, Boston, Massachusetts, USA
| | - Julien Y Bertrand
- Department of Pathology and Immunology, University of Geneva, School of Medicine, Geneva, Switzerland
| | - Valérie Wittamer
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium.,ULB Institute of Neuroscience (UNI), Université Libre de Bruxelles (ULB), Brussels, Belgium.,WELBIO, Université Libre de Bruxelles, Brussels, Belgium
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5
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Ferrero G, Mahony CB, Dupuis E, Yvernogeau L, Di Ruggiero E, Miserocchi M, Caron M, Robin C, Traver D, Bertrand JY, Wittamer V. Embryonic Microglia Derive from Primitive Macrophages and Are Replaced by cmyb-Dependent Definitive Microglia in Zebrafish. Cell Rep 2019; 24:130-141. [PMID: 29972775 DOI: 10.1016/j.celrep.2018.05.066] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 04/17/2018] [Accepted: 05/18/2018] [Indexed: 12/20/2022] Open
Abstract
Microglia, the tissue-resident macrophages of the CNS, represent major targets for therapeutic intervention in a wide variety of neurological disorders. Efficient reprogramming protocols to generate microglia-like cells in vitro using patient-derived induced pluripotent stem cells will, however, require a precise understanding of the cellular and molecular events that instruct microglial cell fates. This remains a challenge since the developmental origin of microglia during embryogenesis is controversial. Here, using genetic tracing in zebrafish, we uncover primitive macrophages as the unique source of embryonic microglia. We also demonstrate that this initial population is transient, with primitive microglia later replaced by definitive microglia that persist throughout adulthood. The adult wave originates from cmyb-dependent hematopoietic stem cells. Collectively, our work challenges the prevailing model establishing erythro-myeloid progenitors as the sole and direct microglial precursor and provides further support for the existence of multiple waves of microglia, which originate from distinct hematopoietic precursors.
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Affiliation(s)
- Giuliano Ferrero
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles (ULB), Brussels, Belgium; ULB Institute of Neuroscience (UNI), ULB, Brussels, Belgium; WELBIO, ULB, Brussels, Belgium
| | - Christopher B Mahony
- Department of Pathology and Immunology, University of Geneva, School of Medicine, Geneva, Switzerland
| | - Eléonore Dupuis
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Laurent Yvernogeau
- Hubrecht Institute-KNAW and University Medical Center, Utrecht, the Netherlands
| | - Elodie Di Ruggiero
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles (ULB), Brussels, Belgium; ULB Institute of Neuroscience (UNI), ULB, Brussels, Belgium
| | - Magali Miserocchi
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Marianne Caron
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles (ULB), Brussels, Belgium; ULB Institute of Neuroscience (UNI), ULB, Brussels, Belgium; WELBIO, ULB, Brussels, Belgium
| | - Catherine Robin
- Hubrecht Institute-KNAW and University Medical Center, Utrecht, the Netherlands; Regenerative Medicine Center, University Medical Center, Utrecht, the Netherlands
| | - David Traver
- Department of Cellular and Molecular Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0380, USA; Section of Cell and Developmental Biology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0380, USA.
| | - Julien Y Bertrand
- Department of Pathology and Immunology, University of Geneva, School of Medicine, Geneva, Switzerland.
| | - Valérie Wittamer
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles (ULB), Brussels, Belgium; ULB Institute of Neuroscience (UNI), ULB, Brussels, Belgium; WELBIO, ULB, Brussels, Belgium.
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6
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Ghersi JJ, Mahony CB, Bertrand JY. bif1, a new BMP signaling inhibitor, regulates embryonic hematopoiesis in the zebrafish. Development 2019; 146:dev.164103. [PMID: 30837221 DOI: 10.1242/dev.164103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 02/06/2018] [Accepted: 02/22/2019] [Indexed: 01/17/2023]
Abstract
Hematopoiesis maintains the entire blood system, and dysregulation of this process can lead to malignancies (leukemia), immunodeficiencies or red blood cell diseases (anemia, polycythemia vera). We took advantage of the zebrafish model that shares most of the genetic program involved in hematopoiesis with mammals to characterize a new gene of unknown function, si:ch73-299h12.2, which is expressed in the erythroid lineage during primitive, definitive and adult hematopoiesis. This gene, required during primitive and definitive erythropoiesis, encodes a C2H2 zinc-finger protein that inhibits BMP signaling. We therefore named this gene blood-inducing factor 1 and BMP inhibitory factor 1 (bif1). We identified a bif1 ortholog in Sinocyclocheilus rhinocerous, another fish, and in the mouse genome. Both genes also inhibit BMP signaling when overexpressed in zebrafish. In conclusion, we have deorphanized a new zebrafish gene of unknown function: bif1 codes for a zinc-finger protein that inhibits BMP signaling and also regulates primitive erythropoiesis and definitive hematopoiesis.
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Affiliation(s)
- Joey J Ghersi
- University of Geneva, School of Medicine, Department of Pathology and Immunology, CMU, University of Geneva, CH-1211 Geneva 4, Switzerland
| | - Christopher B Mahony
- University of Geneva, School of Medicine, Department of Pathology and Immunology, CMU, University of Geneva, CH-1211 Geneva 4, Switzerland
| | - Julien Y Bertrand
- University of Geneva, School of Medicine, Department of Pathology and Immunology, CMU, University of Geneva, CH-1211 Geneva 4, Switzerland
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7
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Mahony CB, Bertrand JY. How HSCs Colonize and Expand in the Fetal Niche of the Vertebrate Embryo: An Evolutionary Perspective. Front Cell Dev Biol 2019; 7:34. [PMID: 30915333 PMCID: PMC6422921 DOI: 10.3389/fcell.2019.00034] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [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: 11/23/2018] [Accepted: 02/25/2019] [Indexed: 12/18/2022] Open
Abstract
Rare hematopoietic stem cells (HSCs) can self-renew, establish the entire blood system and represent the basis of regenerative medicine applied to hematological disorders. Clinical use of HSCs is however limited by their inefficient expansion ex vivo, creating a need to further understand HSC expansion in vivo. After embryonic HSCs are born from the hemogenic endothelium, they migrate to the embryonic/fetal niche, where the future adult HSC pool is established by considerable expansion. This takes place at different anatomical sites and is controlled by numerous signals. HSCs then migrate to their adult niche, where they are maintained throughout adulthood. Exactly how HSC expansion is controlled during embryogenesis remains to be characterized and is an important step to improve the therapeutic use of HSCs. We will review the current knowledge of HSC expansion in the different fetal niches across several model organisms and highlight possible clinical applications.
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Affiliation(s)
- Christopher B Mahony
- Department of Pathology and Immunology, Faculty of Medicine, CMU, University of Geneva, Geneva, Switzerland
| | - Julien Y Bertrand
- Department of Pathology and Immunology, Faculty of Medicine, CMU, University of Geneva, Geneva, Switzerland
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8
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Denis JF, Diagbouga MR, Molica F, Hautefort A, Linnerz T, Watanabe M, Lemeille S, Bertrand JY, Kwak BR. KLF4-Induced Connexin40 Expression Contributes to Arterial Endothelial Quiescence. Front Physiol 2019; 10:80. [PMID: 30809154 PMCID: PMC6379456 DOI: 10.3389/fphys.2019.00080] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [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: 09/11/2018] [Accepted: 01/24/2019] [Indexed: 12/11/2022] Open
Abstract
Shear stress, a blood flow-induced frictional force, is essential in the control of endothelial cell (EC) homeostasis. High laminar shear stress (HLSS), as observed in straight parts of arteries, assures a quiescent non-activated endothelium through the induction of Krüppel-like transcription factors (KLFs). Connexin40 (Cx40)-mediated gap junctional communication is known to contribute to a healthy endothelium by propagating anti-inflammatory signals between ECs, however, the molecular basis of the transcriptional regulation of Cx40 as well as its downstream effectors remain poorly understood. Here, we show that flow-induced KLF4 regulated Cx40 expression in a mouse EC line. Chromatin immunoprecipitation in ECs revealed that KLF4 bound to three predicted KLF consensus binding sites in the Cx40 promoter. HLSS-dependent induction of Cx40 expression was confirmed in primary human ECs. The downstream effects of Cx40 modulation in ECs exposed to HLSS were elucidated by an unbiased transcriptomics approach. Cell cycle progression was identified as an important downstream target of Cx40 under HLSS. In agreement, an increase in the proportion of proliferating cell nuclear antigen (PCNA)-positive ECs and a decrease in the proportion of ECs in the G0/G1 phase were observed under HLSS after Cx40 silencing. Transfection of communication-incompetent HeLa cells with Cx40 demonstrated that the regulation of proliferation by Cx40 was not limited to ECs. Using a zebrafish model, we finally showed faster intersegmental vessel growth and branching into the dorsal longitudinal anastomotic vessel in embryos knock-out for the Cx40 orthologs Cx41.8 and Cx45.6. Most significant effects were observed in embryos with a mutant Cx41.8 encoding for a channel with reduced gap junctional function. Faster intersegmental vessel growth in Cx41.8 mutant embryos was associated with increased EC proliferation as assessed by PH3 immunostaining. Our data shows a novel evolutionary-conserved role of flow-driven KLF4-dependent Cx40 expression in endothelial quiescence that may be relevant for the control of atherosclerosis and diseases involving sprouting angiogenesis.
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Affiliation(s)
- Jean-François Denis
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | | | - Filippo Molica
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Aurélie Hautefort
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Tanja Linnerz
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | | | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Julien Y Bertrand
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Brenda R Kwak
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland.,Department of Medical Specializations - Cardiology, University of Geneva, Geneva, Switzerland
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9
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Mahony CB, Pasche C, Bertrand JY. Oncostatin M and Kit-Ligand Control Hematopoietic Stem Cell Fate during Zebrafish Embryogenesis. Stem Cell Reports 2018; 10:1920-1934. [PMID: 29779898 PMCID: PMC5993650 DOI: 10.1016/j.stemcr.2018.04.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [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: 11/20/2017] [Revised: 04/18/2018] [Accepted: 04/19/2018] [Indexed: 01/23/2023] Open
Abstract
Understanding the molecular pathways controlling hematopoietic stem cell specification and expansion is a necessary milestone to perform regenerative medicine. Here, we used the zebrafish model to study the role of the ckit signaling pathway in this process. We show the importance of kitb/kitlgb signaling in the specification and expansion of hematopoietic stem cells (HSCs), in the hemogenic endothelium and caudal hematopoietic tissue (CHT), respectively. Moreover, we identified the zebrafish ortholog of Oncostatin M (osm) in the zebrafish genome. We show that the osm/osmr pathway acts upstream of kitb during specification of the hemogenic endothelium, while both pathways act synergistically to expand HSCs in the CHT. Moreover, we found that osm, in addition to its role in promoting HSC proliferation, inhibits HSC commitment to the lymphoid fate. Altogether, our data identified two cytokines, kitlgb and osm, secreted by the vascular niche, that control HSCs during early embryonic development. kitb/kitlgb signaling is necessary for HSCs in the zebrafish model osm is a new cytokine important for HSCs in the zebrafish model osmr and kitb signaling are required sequentially for HSC specification osmr and kitb synergize to expand HSCs in the caudal hematopoietic tissue
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Affiliation(s)
- Christopher B Mahony
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, CMU, University of Geneva, 1 Rue Michel-Servet, Geneva 1211, Switzerland
| | - Corentin Pasche
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, CMU, University of Geneva, 1 Rue Michel-Servet, Geneva 1211, Switzerland
| | - Julien Y Bertrand
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology, CMU, University of Geneva, 1 Rue Michel-Servet, Geneva 1211, Switzerland.
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10
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Keightley MC, Carradice DP, Layton JE, Pase L, Bertrand JY, Wittig JG, Dakic A, Badrock AP, Cole NJ, Traver D, Nutt SL, McCoey J, Buckle AM, Heath JK, Lieschke GJ. The Pu.1 target gene Zbtb11 regulates neutrophil development through its integrase-like HHCC zinc finger. Nat Commun 2017; 8:14911. [PMID: 28382966 PMCID: PMC5384227 DOI: 10.1038/ncomms14911] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 02/13/2017] [Indexed: 12/27/2022] Open
Abstract
In response to infection and injury, the neutrophil population rapidly expands and then quickly re-establishes the basal state when inflammation resolves. The exact pathways governing neutrophil/macrophage lineage outputs from a common granulocyte-macrophage progenitor are still not completely understood. From a forward genetic screen in zebrafish, we identify the transcriptional repressor, ZBTB11, as critical for basal and emergency granulopoiesis. ZBTB11 sits in a pathway directly downstream of master myeloid regulators including PU.1, and TP53 is one direct ZBTB11 transcriptional target. TP53 repression is dependent on ZBTB11 cys116, which is a functionally critical, metal ion-coordinating residue within a novel viral integrase-like zinc finger domain. To our knowledge, this is the first description of a function for this domain in a cellular protein. We demonstrate that the PU.1–ZBTB11–TP53 pathway is conserved from fish to mammals. Finally, Zbtb11 mutant rescue experiments point to a ZBTB11-regulated TP53 requirement in development of other organs. Neutrophils are increased in response to injury and infection but how they form from a common granulocyte-macrophage progenitor is unclear. Here, the authors identify a role for the transcriptional repressor ZBTB11 in zebrafish, which is regulated by master myeloid regulators and represses TP53.
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Affiliation(s)
- Maria-Cristina Keightley
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria 3800, Australia.,The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia
| | - Duncan P Carradice
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.,Department of Medical Biology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Judith E Layton
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.,Ludwig Institute for Cancer Research, Melbourne-Parkville Branch, The Royal Melbourne Hospital, Parkville, Victoria 3050, Australia
| | - Luke Pase
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria 3800, Australia.,The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.,Department of Medical Biology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Julien Y Bertrand
- Department of Pathology and Immunology, University of Geneva-CMU, 1211 Geneva 4, Switzerland
| | - Johannes G Wittig
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria 3800, Australia
| | - Aleksandar Dakic
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia
| | - Andrew P Badrock
- Faculty of Life Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Nicholas J Cole
- Motor Neuron Disease Research Group, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | - David Traver
- Department of Cellular and Molecular Medicine, University of California at San Diego, La Jolla, California 92093, USA
| | - Stephen L Nutt
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.,Department of Medical Biology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Julia McCoey
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Ashley M Buckle
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
| | - Joan K Heath
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.,Department of Medical Biology, University of Melbourne, Parkville, Victoria 3010, Australia.,Ludwig Institute for Cancer Research, Melbourne-Parkville Branch, The Royal Melbourne Hospital, Parkville, Victoria 3050, Australia
| | - Graham J Lieschke
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria 3800, Australia.,The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.,Ludwig Institute for Cancer Research, Melbourne-Parkville Branch, The Royal Melbourne Hospital, Parkville, Victoria 3050, Australia
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11
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McCarthy N, Sidik A, Bertrand JY, Eberhart JK. An Fgf-Shh signaling hierarchy regulates early specification of the zebrafish skull. Dev Biol 2016; 415:261-277. [PMID: 27060628 PMCID: PMC4967541 DOI: 10.1016/j.ydbio.2016.04.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 03/30/2016] [Accepted: 04/05/2016] [Indexed: 02/03/2023]
Abstract
The neurocranium generates most of the craniofacial skeleton and consists of prechordal and postchordal regions. Although development of the prechordal is well studied, little is known of the postchordal region. Here we characterize a signaling hierarchy necessary for postchordal neurocranial development involving Fibroblast growth factor (Fgf) signaling for early specification of mesodermally-derived progenitor cells. The expression of hyaluron synthetase 2 (has2) in the cephalic mesoderm requires Fgf signaling and Has2 function, in turn, is required for postchordal neurocranial development. While Hedgehog (Hh)-deficient embryos also lack a postchordal neurocranium, this appears primarily due to a later defect in chondrocyte differentiation. Inhibitor studies demonstrate that postchordal neurocranial development requires early Fgf and later Hh signaling. Collectively, our results provide a mechanistic understanding of early postchordal neurocranial development and demonstrate a hierarchy of signaling between Fgf and Hh in the development of this structure.
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Affiliation(s)
- Neil McCarthy
- Department of Molecular Biosciences; Institute of Cell and Molecular Biology, Waggoner Center for Alcohol and Alcohol Addiction Research, University of Texas, Austin, TX, United States
| | - Alfire Sidik
- Department of Molecular Biosciences; Institute of Cell and Molecular Biology, Waggoner Center for Alcohol and Alcohol Addiction Research, University of Texas, Austin, TX, United States
| | - Julien Y Bertrand
- Department of Pathology and Immunology, University of Geneva Medical School, Geneva, Switzerland
| | - Johann K Eberhart
- Department of Molecular Biosciences; Institute of Cell and Molecular Biology, Waggoner Center for Alcohol and Alcohol Addiction Research, University of Texas, Austin, TX, United States; Department of Molecular Biosciences; Institute of Neurobiology, University of Texas, Austin, TX, United States.
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12
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Bertrand JY, Chi NC, Santoso B, Teng S, Stainier DYR, Traver D. Haematopoietic stem cells derive directly from aortic endothelium during development. Nature 2010; 464:108-11. [PMID: 20154733 PMCID: PMC2858358 DOI: 10.1038/nature08738] [Citation(s) in RCA: 734] [Impact Index Per Article: 52.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2009] [Accepted: 12/09/2009] [Indexed: 12/18/2022]
Abstract
A major goal of regenerative medicine is to instruct formation of multipotent, tissue-specific stem cells from induced pluripotent stem cells (iPSCs) for cell replacement therapies. Generation of haematopoietic stem cells (HSCs) from iPSCs or embryonic stem cells (ESCs) is not currently possible, however, necessitating a better understanding of how HSCs normally arise during embryonic development. We previously showed that haematopoiesis occurs through four distinct waves during zebrafish development, with HSCs arising in the final wave in close association with the dorsal aorta. Recent reports have suggested that murine HSCs derive from haemogenic endothelial cells (ECs) lining the aortic floor. Additional in vitro studies have similarly indicated that the haematopoietic progeny of ESCs arise through intermediates with endothelial potential. Here we have used the unique strengths of the zebrafish embryo to image directly the generation of HSCs from the ventral wall of the dorsal aorta. Using combinations of fluorescent reporter transgenes, confocal time-lapse microscopy and flow cytometry, we have identified and isolated the stepwise intermediates as aortic haemogenic endothelium transitions to nascent HSCs. Finally, using a permanent lineage tracing strategy, we demonstrate that the HSCs generated from haemogenic endothelium are the lineal founders of the adult haematopoietic system.
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Affiliation(s)
- Julien Y Bertrand
- Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California 92093-0380, USA
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13
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Cantagrel V, Silhavy JL, Bielas SL, Swistun D, Marsh SE, Bertrand JY, Audollent S, Attié-Bitach T, Holden KR, Dobyns WB, Traver D, Al-Gazali L, Ali BR, Lindner TH, Caspary T, Otto EA, Hildebrandt F, Glass IA, Logan CV, Johnson CA, Bennett C, Brancati F, Valente EM, Woods CG, Gleeson JG. Mutations in the cilia gene ARL13B lead to the classical form of Joubert syndrome. Am J Hum Genet 2008; 83:170-9. [PMID: 18674751 PMCID: PMC2495072 DOI: 10.1016/j.ajhg.2008.06.023] [Citation(s) in RCA: 284] [Impact Index Per Article: 17.8] [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: 05/12/2008] [Revised: 06/11/2008] [Accepted: 06/30/2008] [Indexed: 02/05/2023] Open
Abstract
Joubert syndrome (JS) and related disorders are a group of autosomal-recessive conditions sharing the "molar tooth sign" on axial brain MRI, together with cerebellar vermis hypoplasia, ataxia, and psychomotor delay. JS is suggested to be a disorder of cilia function and is part of a spectrum of disorders involving retinal, renal, digital, oral, hepatic, and cerebral organs. We identified mutations in ARL13B in two families with the classical form of JS. ARL13B belongs to the Ras GTPase family, and in other species is required for ciliogenesis, body axis formation, and renal function. The encoded Arl13b protein was expressed in developing murine cerebellum and localized to the cilia in primary neurons. Overexpression of human wild-type but not patient mutant ARL13B rescued the Arl13b scorpion zebrafish mutant. Thus, ARL13B has an evolutionarily conserved role mediating cilia function in multiple organs.
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Affiliation(s)
- Vincent Cantagrel
- Laboratory of Neurogenetics, Howard Hughes Medical Institute, Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0691, USA
| | - Jennifer L. Silhavy
- Laboratory of Neurogenetics, Howard Hughes Medical Institute, Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0691, USA
| | - Stephanie L. Bielas
- Laboratory of Neurogenetics, Howard Hughes Medical Institute, Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0691, USA
| | - Dominika Swistun
- Laboratory of Neurogenetics, Howard Hughes Medical Institute, Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0691, USA
| | - Sarah E. Marsh
- Laboratory of Neurogenetics, Howard Hughes Medical Institute, Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0691, USA
| | - Julien Y. Bertrand
- Section of Cell and Developmental Biology, Division of Biological Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0380, USA
| | - Sophie Audollent
- Département de Génétique et INSERM U781, Hôpital Necker-Enfants Malades, 149 rue de Sèvres, 75743 Paris Cedex 15, France
| | - Tania Attié-Bitach
- Département de Génétique et INSERM U781, Hôpital Necker-Enfants Malades, 149 rue de Sèvres, 75743 Paris Cedex 15, France
| | - Kenton R. Holden
- Neurosciences Section, Greenwood Genetic Center, 101 Gregor Mendel Circle, Greenwood, SC 29646, USA
- Departments of Neuroscience and Pediatrics, Medical University of South Carolina, Charleston, SC 29425, USA
| | - William B. Dobyns
- Department of Human Genetics, The University of Chicago, Room 319 CLSC, 920 E. 58th Street, IL 60637, USA
| | - David Traver
- Section of Cell and Developmental Biology, Division of Biological Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0380, USA
| | - Lihadh Al-Gazali
- Department of Pediatrics, United Arab Emirates University, Faculty of Medicine and Health Sciences, PO Box 17666, Al-Ain, United Arab Emirates
| | - Bassam R. Ali
- Department of Pathology, United Arab Emirates University, Faculty of Medicine and Health Sciences, PO Box 17666, Al-Ain, United Arab Emirates
| | - Tom H. Lindner
- Division of Nephrology, Department of Internal Medicine III, University Clinic Leipzig, Philipp-Rosenthal-Str. 27, 04103 Leipzig, Germany
| | - Tamara Caspary
- Department of Human Genetics, Emory University School of Medicine, 615 Michael St. Suite 301, Atlanta, GA 30322-1047, USA
| | - Edgar A. Otto
- Department of Pediatrics, University of Michigan, 8220C MSRB III, 1150 West Medical Center Drive, Ann Arbor, MI 48109-5640, USA
| | - Friedhelm Hildebrandt
- Department of Pediatrics, University of Michigan, 8220C MSRB III, 1150 West Medical Center Drive, Ann Arbor, MI 48109-5640, USA
| | - Ian A. Glass
- Department of Pediatrics and Medicine, University of Washington School of Medicine, Childrens Hospital Regional Medical Center, A-7937, 4800 Sand Point Way NE, Seattle, WA 98105, USA
| | - Clare V. Logan
- Section of Ophthalmology and Neurosciences, Wellcome Trust Brenner Building, Leeds Institute of Molecular Medicine, St James's University Hospital, Beckett Street, Leeds LS9 7TF, UK
| | - Colin A. Johnson
- Section of Ophthalmology and Neurosciences, Wellcome Trust Brenner Building, Leeds Institute of Molecular Medicine, St James's University Hospital, Beckett Street, Leeds LS9 7TF, UK
| | - Christopher Bennett
- Yorkshire Regional Genetics Service, St James's University Hospital, Beckett Street, Leeds LS9 7TF, UK
| | - Francesco Brancati
- Instituto di Ricovero e Cura a Carattere Scientifico, Casa Sollievo della Sofferenza, Mendel Institute, viale Regina Margherita 261, 00198 Rome, Italy
| | | | - Enza Maria Valente
- Instituto di Ricovero e Cura a Carattere Scientifico, Casa Sollievo della Sofferenza, Mendel Institute, viale Regina Margherita 261, 00198 Rome, Italy
| | - C. Geoffrey Woods
- Department of Medical Genetics, Cambridge Institute for Medical Research, Wellcome/MRC Building, Addenbrooke's Hospital, Cambridge CB2 0XY, UK
| | - Joseph G. Gleeson
- Laboratory of Neurogenetics, Howard Hughes Medical Institute, Department of Neurosciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0691, USA
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14
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Bertrand JY, Kim AD, Teng S, Traver D. CD41+ cmyb+ precursors colonize the zebrafish pronephros by a novel migration route to initiate adult hematopoiesis. Development 2008; 135:1853-62. [PMID: 18417622 PMCID: PMC2762343 DOI: 10.1242/dev.015297] [Citation(s) in RCA: 186] [Impact Index Per Article: 11.6] [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: 02/02/2023]
Abstract
Development of the vertebrate blood lineages is complex, with multiple waves of hematopoietic precursors arising in different embryonic locations. Monopotent, or primitive, precursors first give rise to embryonic macrophages or erythrocytes. Multipotent, or definitive, precursors are subsequently generated to produce the adult hematopoietic lineages. In both the zebrafish and the mouse, the first definitive precursors are committed erythromyeloid progenitors (EMPs) that lack lymphoid differentiation potential. We have previously shown that zebrafish EMPs arise in the posterior blood island independently from hematopoietic stem cells (HSCs). In this report, we demonstrate that a fourth wave of hematopoietic precursors arises slightly later in the zebrafish aorta/gonad/mesonephros (AGM) equivalent. We have identified and prospectively isolated these cells by CD41 (itga2b) and cmyb expression. Unlike EMPs, CD41(+) AGM cells colonize the thymus to generate rag2(+) T lymphocyte precursors. Timelapse imaging and lineage tracing analyses demonstrate that AGM-derived precursors use a previously undescribed migration pathway along the pronephric tubules to initiate adult hematopoiesis in the developing kidney, the teleostean equivalent of mammalian bone marrow. Finally, we have analyzed the gene expression profiles of EMPs and AGM precursors to better understand the molecular cues that pattern the first definitive hematopoietic cells in the embryo. Together, these studies suggest that expression of CD41 and cmyb marks nascent HSCs in the zebrafish AGM, and provide the means to further dissect HSC generation and function in the early vertebrate embryo.
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Affiliation(s)
- Julien Y Bertrand
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0380, USA
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15
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Vondenhoff MFR, Desanti GE, Cupedo T, Bertrand JY, Cumano A, Kraal G, Mebius RE, Golub R. Separation of splenic red and white pulp occurs before birth in a LTalphabeta-independent manner. J Leukoc Biol 2008; 84:152-61. [PMID: 18403646 DOI: 10.1189/jlb.0907659] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
For the formation of lymph nodes and Peyer's patches, lymphoid tissue inducer (LTi) cells are crucial in triggering stromal cells to recruit and retain hematopoietic cells. Although LTi cells have been observed in fetal spleen, not much is known about fetal spleen development and the role of LTi cells in this process. Here, we show that LTi cells collect in a periarteriolar manner in fetal spleen at the periphery of the white pulp anlagen. Expression of the homeostatic chemokines can be detected in stromal and endothelial cells, suggesting that LTi cells are attracted by these chemokines. As lymphotoxin (LT)alpha1beta2 can be detected on B cells but not LTi cells in neonatal spleen, starting at 4 days after birth, the earliest formation of the white pulp in fetal spleen occurs in a LTalpha1beta2-independent manner. The postnatal development of the splenic white pulp, involving the influx of T cells, depends on LTalpha1beta2 expressed by B cells.
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Affiliation(s)
- Mark F R Vondenhoff
- Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands
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16
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Bertrand JY, Kim AD, Violette EP, Stachura DL, Cisson JL, Traver D. Definitive hematopoiesis initiates through a committed erythromyeloid progenitor in the zebrafish embryo. Development 2007; 134:4147-56. [PMID: 17959717 DOI: 10.1242/dev.012385] [Citation(s) in RCA: 252] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Shifting sites of blood cell production during development is common across widely divergent phyla. In zebrafish, like other vertebrates, hematopoietic development has been roughly divided into two waves, termed primitive and definitive. Primitive hematopoiesis is characterized by the generation of embryonic erythrocytes in the intermediate cell mass and a distinct population of macrophages that arises from cephalic mesoderm. Based on previous gene expression studies, definitive hematopoiesis has been suggested to begin with the generation of presumptive hematopoietic stem cells (HSCs) along the dorsal aorta that express c-myb and runx1. Here we show, using a combination of gene expression analyses, prospective isolation approaches, transplantation, and in vivo lineage-tracing experiments, that definitive hematopoiesis initiates through committed erythromyeloid progenitors (EMPs) in the posterior blood island (PBI) that arise independently of HSCs. EMPs isolated by coexpression of fluorescent transgenes driven by the lmo2 and gata1 promoters exhibit an immature, blastic morphology and express only erythroid and myeloid genes. Transplanted EMPs home to the PBI, show limited proliferative potential, and do not seed subsequent hematopoietic sites such as the thymus or pronephros. In vivo fate-mapping studies similarly demonstrate that EMPs possess only transient proliferative potential, with differentiated progeny remaining largely within caudal hematopoietic tissue. Additional fate mapping of mesodermal derivatives in mid-somitogenesis embryos suggests that EMPs are born directly in the PBI. These studies provide phenotypic and functional analyses of the first hematopoietic progenitors in the zebrafish embryo and demonstrate that definitive hematopoiesis proceeds through two distinct waves during embryonic development.
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Affiliation(s)
- Julien Y Bertrand
- Section of Cell and Developmental Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0380, USA
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17
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Abstract
The role of the fetal spleen in hematopoeisis remains largely unknown. In this particular environment, we show that hematopoietic stem cells do not proliferate, but that they lose multipotency and differentiate exclusively into mature macrophages. B lymphocytes in the spleen derive from committed B cell precursors that are likely to have immigrated from the fetal liver. We developed fetal spleen stromal cell lines that are unique in their capacity to expand myeloid precursors, resulting in large numbers of mature macrophages. These lines secrete high levels of anti-inflammatory molecules. By phenotype, fetal splenic macrophages are reminiscent of their adult counterparts found in the red pulp. We postulate that F4/80(+) splenic macrophages participate in fetal erythropoiesis, as well as in the formation of the splenic architecture.
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Affiliation(s)
- Julien Y Bertrand
- Unité du Développement des Lymphocytes, INSERM U668, Institut Pasteur, 25, Rue du Dr Roux, 75724 Paris cedex 15, France
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18
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Abstract
The existence of macrophages (Mphi) of yolk-sac (YS) origin has been reported in all vertebrate models. However, the nature of their precursors and pathways of differentiation have not been elucidated. Phenotypic and differentiation potential analyses of YS at 7.5 to 10 postcoital days (dpc), performed in CX3CR1(GFP) embryos, allowed us to discern 3 independent Mphi populations. A first transient wave consisted of mature, maternal-derived Mphipresent as early as 7.5 to 8 dpc. A second wave of committed Mphi precursors arose at 8 dpc (2-4 somite stage) and was followed by a third wave of erythromyeloid precursors (4-6 somite stage). Both types of precursors displayed similar phenotypes and gave rise to CX3CR1/green fluorescent protein (GFP)-positive Mphi, but differed by their differentiation potential, at the clonal level. The combined data of phenotypic, gene-expression, and in situ analyses allowed us to conclude that the previously named "primitive Mphi" corresponded to a mixture of the first transient wave and committed Mphi precursors. Both YS-derived precursors followed a developmental pathway common to adult Mphi and could be qualified as definitive.
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Affiliation(s)
- Julien Y Bertrand
- Institut National de la Santé et de la Recherche Médicale (INSERM) U668, Unité de Développement des Lymphocytes, Institut Pasteur, Paris, France
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19
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Abstract
The progress of the last few years in the understanding of hematopoietic cell development during embryogenesis resulted from a combination of experimental approaches used in hematology and developmental biology. This methodology has been particularly powerful for the analysis of the earliest steps of hematopoietic ontogeny because it allows for the first time the demonstration of the existence of two independent sites of hematopoietic cell generation. Here, we describe the methods used in our laboratories to characterize the phenotype and differentiation potential of the primordial hematopoietic precursors as well as their localization in the mouse embryo. This multidisciplinary approach is required to explore the mechanisms of hematopoietic cell generation.
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Affiliation(s)
- Julien Y Bertrand
- Unité du Développement des Lymphocytes, Institut Pasteur, Paris, France
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20
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Bertrand JY, Giroux S, Golub R, Klaine M, Jalil A, Boucontet L, Godin I, Cumano A. Characterization of purified intraembryonic hematopoietic stem cells as a tool to define their site of origin. Proc Natl Acad Sci U S A 2004; 102:134-9. [PMID: 15623562 PMCID: PMC544043 DOI: 10.1073/pnas.0402270102] [Citation(s) in RCA: 189] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Little is known about hematopoietic stem cell (HSC) development from mesoderm. To gain more information on the intraembryonic HSC site of origin, we purified multipotent hematopoietic progenitors from the aorta-gonads-mesonephros (AGM) of mice. This population, expressing c-Kit, AA4.1, CD31, and CD41, but not Flk1, and mainly negative for CD45, proved capable of long-term reconstitution in sublethally irradiated Rag2gammac(-/-) recipients. We assigned the expression of GATA-2, GATA-3, and lmo2 to AGM-HSC, whereas erythromyeloid progenitors express only GATA-2. This unique combination of surface markers and transcription factors could be allocated in the AGM to the intraaortic clusters and the subaortic patches underlying aortic endothelial cells. Taken together, those data indicate that embryonic HSCs (i) differ from their fetal liver and adult counterpart by the low expression of CD45, (ii) do not colocalize with aortic endothelial cells as previously thought, and (iii) are localized, at 10.5 days postcoitum, in the splanchnic mesoderm underlying aortic endothelial cells, within GATA-3(+)CD31(+) cell clusters.
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Affiliation(s)
- Julien Y Bertrand
- Unité du Développement des Lymphocytes, Unité de Recherche Associée Centre National de la Recherche Scientifique 1961, Institut Pasteur, 25 Rue du Dr. Roux, 75724 Paris Cedex 15, France
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21
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Vitry S, Bertrand JY, Cumano A, Dubois-Dalcq M. Primordial hematopoietic stem cells generate microglia but not myelin-forming cells in a neural environment. J Neurosci 2003; 23:10724-31. [PMID: 14627658 PMCID: PMC6740906] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
Abstract
Finding ways to enhance remyelination is a major challenge in treating demyelinating diseases. Recent studies have suggested that circulating bone marrow cells can home in brain and transdifferentiate into neural cells. To ask whether hematopoietic precursors can form myelinating cells, we investigated the neuropoietic potential of embryonic precursors sorted from the mouse aorta-gonads-mesonephros (AGM) region. This cell fraction is capable of long-term hematopoietic reconstitution and generates colonies containing multipotential precursors and lymphoid or erythro-myeloid progenies. When cultured in hematopoietic growth conditions, a fraction of CD45-positive AGM cells coexpress neural markers such as nestin, the polysialylated form of neural cell adhesion molecule, the betaIII tubulin isoform, and glial fibrillary acidic protein. However, when hematopoietic precursors containing green fluorescent protein were cocultured with embryonic striatal precursors into neurospheres, they maintained their hematopoietic phenotype without undergoing differentiation into neurons, astrocytes, or oligodendrocytes. After intraventricular grafting, hematopoietic precursors integrated into the brain of wild-type or hypomyelinated newborn shiverer mice and gave rise to microglia but not neurons or glia. In contrast, when wild-type embryonic striatal neurospheres were grafted in shiverer, they formed numerous myelin internode patches. Even when neural and hematopoietic precursors were grafted together into shiverer mice, only neural precursors generated myelin-forming cells and synthesized myelin. Thus, embryonic neurospheres have myelin repair properties not shown by embryonic hematopoietic precursors. This suggests that the use of multipotential neural precursors to generate myelin-forming cells remains one of the most promising avenues toward remyelination therapies.
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Affiliation(s)
- Sandrine Vitry
- Unité de Neurovirologie et Régénération du Système Nerveux Centre National de la Recherche Scientifique 1961, Institut Pasteur, 75724, Paris, Cedex 15, France
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