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Maéno M, Tanabe M, Ogawa A, Kobayashi H, Izutsu Y, Kato T. Identification and characterization of myeloid cells localized in the tadpole liver cortex in Xenopus laevis. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2024; 156:105178. [PMID: 38599553 DOI: 10.1016/j.dci.2024.105178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 03/29/2024] [Accepted: 04/07/2024] [Indexed: 04/12/2024]
Abstract
In the present study, using transgenic frogs that express GFP specifically in myeloid cells under the myeloperoxidase enhancer sequence, we found that myeloperoxidase-positive cells are localized in the liver cortex at the late tadpole stages. Immunohistochemical analysis revealed that myelopoiesis in the liver cortex became evident after st. 50 and reached its peak by st. 56. Transplantation experiments indicated that cells with a high density at the liver cortex were derived from the dorso-lateral plate tissue in the neurula embryo. Analysis of smear samples of the cells isolated from collagenase-treated liver tissues of the transgenic tadpoles indicated that myeloid cells were the major population of blood cells in the larval liver and that, in addition to myeloid colonies, erythroid colonies expanded in entire liver after metamorphosis. Cells that were purified from the livers of transgenic tadpoles according to the GFP expression exhibited the multi-lobed nuclei. The results of present study provide evidence that the liver cortex of the Xenopus tadpole is a major site of granulopoiesis.
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Affiliation(s)
- Mitsugu Maéno
- Institute of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan.
| | - Miki Tanabe
- Faculty of Science, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Ayame Ogawa
- Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, TWIns building, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-8480, Japan; Department of Biology, School of Education, Waseda University, Center for Advanced Biomedical Science, TWIns building, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-8480, Japan
| | - Haruka Kobayashi
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Yumi Izutsu
- Institute of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Takashi Kato
- Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, TWIns building, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-8480, Japan; Department of Biology, School of Education, Waseda University, Center for Advanced Biomedical Science, TWIns building, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-8480, Japan
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2
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Kato S, Inomata H. Blastopore gating mechanism to regulate extracellular fluid excretion. iScience 2023; 26:106585. [PMID: 37192977 PMCID: PMC10182286 DOI: 10.1016/j.isci.2023.106585] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 02/07/2023] [Accepted: 03/29/2023] [Indexed: 05/18/2023] Open
Abstract
Fluid uptake and efflux play roles in early embryogenesis as well as in adult homeostasis. Multicellular organisms have two main pathways for fluid movement: cellular-level, such as transcellular and paracellular pathways, and tissue-level, involving muscle contraction. Interestingly, early Xenopus embryos with immature functional muscles excrete archenteron fluid via a tissue-level mechanism that opens the blastopore through a gating mechanism that is unclear. Using microelectrodes, we show that the archenteron has a constant fluid pressure and as development progress the blastopore pressure resistance decreases. Combining physical perturbations and imaging analyses, we found that the pushing force exerted by the circumblastoporal collars (CBCs) at the slit periphery regulates pressure resistance. We show that apical constriction at the blastopore dorsoventral ends contributes to this pushing force, and relaxation of ventral constriction causes fluid excretion. These results indicate that actomyosin contraction mediates temporal control of tissue-level blastopore opening and fluid excretion in early Xenopus embryos.
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Affiliation(s)
- Soichiro Kato
- Laboratory for Axial Pattern Dynamics, Center for Biosystems Dynamics Research, RIKEN, Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
- Laboratory for Developmental Morphogeometry, Center for Biosystems Dynamics Research, RIKEN, Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
- Department of Biological Sciences, Graduate School of Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-0043, Japan
- Corresponding author
| | - Hidehiko Inomata
- Laboratory for Axial Pattern Dynamics, Center for Biosystems Dynamics Research, RIKEN, Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
- Department of Biological Sciences, Graduate School of Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-0043, Japan
- Corresponding author
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3
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Mattonet K, Riemslagh FW, Guenther S, Prummel KD, Kesavan G, Hans S, Ebersberger I, Brand M, Burger A, Reischauer S, Mosimann C, Stainier DYR. Endothelial versus pronephron fate decision is modulated by the transcription factors Cloche/Npas4l, Tal1, and Lmo2. SCIENCE ADVANCES 2022; 8:eabn2082. [PMID: 36044573 PMCID: PMC9432843 DOI: 10.1126/sciadv.abn2082] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Endothelial specification is a key event during embryogenesis; however, when, and how, endothelial cells separate from other lineages is poorly understood. In zebrafish, Npas4l is indispensable for endothelial specification by inducing the expression of the transcription factor genes etsrp, tal1, and lmo2. We generated a knock-in reporter in zebrafish npas4l to visualize endothelial progenitors and their derivatives in wild-type and mutant embryos. Unexpectedly, we find that in npas4l mutants, npas4l reporter-expressing cells contribute to the pronephron tubules. Single-cell transcriptomics and live imaging of the early lateral plate mesoderm in wild-type embryos indeed reveals coexpression of endothelial and pronephron markers, a finding confirmed by creERT2-based lineage tracing. Increased contribution of npas4l reporter-expressing cells to pronephron tubules is also observed in tal1 and lmo2 mutants and is reversed in npas4l mutants injected with tal1 mRNA. Together, these data reveal that Npas4l/Tal1/Lmo2 regulate the fate decision between the endothelial and pronephron lineages.
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Affiliation(s)
- Kenny Mattonet
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim, 61231, Germany
- DZHK (German Center for Cardiovascular Research), partner site, 43, D-61231 Bad Nauheim
- CPI (Cardio Pulmonary Institute), partner site, 43, D-61231 Bad Nauheim
- DZL (German Center for Lung Research), partner site, 43, D-61231 Bad Nauheim
| | - Fréderike W. Riemslagh
- Section of Developmental Biology, Department of Pediatrics, University of Colorado School of Medicine, Anschutz Medical Campus, 12801 E 17th Avenue, Aurora, CO 80045, USA
| | - Stefan Guenther
- DZHK (German Center for Cardiovascular Research), partner site, 43, D-61231 Bad Nauheim
- CPI (Cardio Pulmonary Institute), partner site, 43, D-61231 Bad Nauheim
- Bioinformatics and Deep Sequencing Platform, Max Planck Institute for Heart and Lung Research, Bad Nauheim 61231, Germany
| | - Karin D. Prummel
- Section of Developmental Biology, Department of Pediatrics, University of Colorado School of Medicine, Anschutz Medical Campus, 12801 E 17th Avenue, Aurora, CO 80045, USA
| | - Gokul Kesavan
- Center for Regenerative Therapies at TU Dresden (CRTD); Dresden, Germany
| | - Stefan Hans
- Center for Regenerative Therapies at TU Dresden (CRTD); Dresden, Germany
| | - Ingo Ebersberger
- Goethe University Frankfurt am Main, Institute of Cell Biology and Neuroscience, Frankfurt 60438, Germany
- Senckenberg Biodiversity and Climate Research Center (S-BIKF), Frankfurt 60325, Germany
- LOEWE Center for Translational Biodiversity Genomics (TBG), Frankfurt 60325, Germany
| | - Michael Brand
- Center for Regenerative Therapies at TU Dresden (CRTD); Dresden, Germany
| | - Alexa Burger
- Section of Developmental Biology, Department of Pediatrics, University of Colorado School of Medicine, Anschutz Medical Campus, 12801 E 17th Avenue, Aurora, CO 80045, USA
| | - Sven Reischauer
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim, 61231, Germany
- CPI (Cardio Pulmonary Institute), partner site, 43, D-61231 Bad Nauheim
| | - Christian Mosimann
- Section of Developmental Biology, Department of Pediatrics, University of Colorado School of Medicine, Anschutz Medical Campus, 12801 E 17th Avenue, Aurora, CO 80045, USA
| | - Didier Y. R. Stainier
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim, 61231, Germany
- DZHK (German Center for Cardiovascular Research), partner site, 43, D-61231 Bad Nauheim
- CPI (Cardio Pulmonary Institute), partner site, 43, D-61231 Bad Nauheim
- DZL (German Center for Lung Research), partner site, 43, D-61231 Bad Nauheim
- Corresponding author.
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4
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Embryonic Origins of the Hematopoietic System: Hierarchies and Heterogeneity. Hemasphere 2022; 6:e737. [PMID: 35647488 PMCID: PMC9132533 DOI: 10.1097/hs9.0000000000000737] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 04/28/2022] [Indexed: 11/26/2022] Open
Abstract
The hierarchical framework of the adult blood system as we know it from current medical and hematology textbooks, displays a linear branching network of dividing and differentiated cells essential for the growth and maintenance of the healthy organism. This view of the hierarchy has evolved over the last 75 years. An amazing increase in cellular complexity has been realized; however, innovative single-cell technologies continue to uncover essential cell types and functions in animal models and the human blood system. The most potent cell of the hematopoietic hierarchy is the hematopoietic stem cell. Stem cells for adult tissues are the long-lived self-renewing cellular component, which ensure that differentiated tissue-specific cells are maintained and replaced through the entire adult lifespan. Although much blood research is focused on hematopoietic tissue homeostasis, replacement and regeneration during adult life, embryological studies have widened and enriched our understanding of additional developmental hierarchies and interacting cells of this life-sustaining tissue. Here, we review the current state of knowledge of the hierarchical organization and the vast heterogeneity of the hematopoietic system from embryonic to adult stages.
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5
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Abstract
Neural crest stem/progenitor cells arise early during vertebrate embryogenesis at the border of the forming central nervous system. They subsequently migrate throughout the body, eventually differentiating into diverse cell types ranging from neurons and glia of the peripheral nervous system to bones of the face, portions of the heart, and pigmentation of the skin. Along the body axis, the neural crest is heterogeneous, with different subpopulations arising in the head, neck, trunk, and tail regions, each characterized by distinct migratory patterns and developmental potential. Modern genomic approaches like single-cell RNA- and ATAC-sequencing (seq) have greatly enhanced our understanding of cell lineage trajectories and gene regulatory circuitry underlying the developmental progression of neural crest cells. Here, we discuss how genomic approaches have provided new insights into old questions in neural crest biology by elucidating transcriptional and posttranscriptional mechanisms that govern neural crest formation and the establishment of axial level identity. Expected final online publication date for the Annual Review of Genetics, Volume 55 is November 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Shashank Gandhi
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125, USA; ,
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125, USA; ,
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6
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Yang X, Cao N, Chen L, Liu L, Zhang M, Cao Y. Suppression of Cell Tumorigenicity by Non-neural Pro-differentiation Factors via Inhibition of Neural Property in Tumorigenic Cells. Front Cell Dev Biol 2021; 9:714383. [PMID: 34595169 PMCID: PMC8476888 DOI: 10.3389/fcell.2021.714383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 08/16/2021] [Indexed: 11/13/2022] Open
Abstract
Our studies have demonstrated that cell tumorigenicity and pluripotent differentiation potential stem from neural stemness or a neural ground state, which is defined by a regulatory network of higher levels of machineries for basic cell physiological functions, including cell cycle, ribosome biogenesis, protein translation, spliceosome, epigenetic modification factors, reprogramming factors, etc., in addition to the neural stemness specific factors. These machineries and neural stemness factors mostly play cancer-promoting roles. It can be deduced that differentiation requires the repression of neural ground state and causes the reduction or loss of neural ground state and thus tumorigenicity in tumorigenic cells. Formerly, we showed that neuronal differentiation led to reduced tumorigenicity in tumorigenic cells. In the present study, we show that non-neural pro-differentiation factors, such as GATA3, HNF4A, HHEX, and FOXA3 that specify mesodermal or/and endodermal tissues during vertebrate embryogenesis, suppress tumorigenicity via repression of neural stemness and promotion of non-neural property in tumorigenic cells. Mechanistically, these transcription factors repress the transcription of neural enriched genes and meanwhile activate genes that specify non-neural properties via direct binding to the promoters of these genes. We also show that combined expression of HHEX and FOXA3 suppresses tumorigenesis effectively in the AOM/DSS model of colitis-associated cancer. We suggest that targeting the property of neural stemness could be an effective strategy for cancer therapy.
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Affiliation(s)
- Xiaoli Yang
- Shenzhen Research Institute of Nanjing University, Shenzhen, China
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine of Medical School, Nanjing University, Nanjing, China
| | - Ning Cao
- Shenzhen Research Institute of Nanjing University, Shenzhen, China
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine of Medical School, Nanjing University, Nanjing, China
| | - Lu Chen
- Shenzhen Research Institute of Nanjing University, Shenzhen, China
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine of Medical School, Nanjing University, Nanjing, China
| | - Lin Liu
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine of Medical School, Nanjing University, Nanjing, China
| | - Min Zhang
- Shenzhen Research Institute of Nanjing University, Shenzhen, China
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine of Medical School, Nanjing University, Nanjing, China
| | - Ying Cao
- Shenzhen Research Institute of Nanjing University, Shenzhen, China
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine of Medical School, Nanjing University, Nanjing, China
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7
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Ezawa M, Kouno F, Kubo H, Sakuma T, Yamamoto T, Kinoshita T. Pou5f3.3 is involved in establishment and maintenance of hematopoietic cells during Xenopus development. Tissue Cell 2021; 72:101531. [PMID: 33798831 DOI: 10.1016/j.tice.2021.101531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 03/05/2021] [Accepted: 03/15/2021] [Indexed: 11/30/2022]
Abstract
Three POU family class V gene homologues are expressed in the development of Xenopus. In contrast to the expression of Pou5f3.1 and Pou5f3.2 in organogenesis, Pou5f3.3 is expressed during oogenesis in ovary. We investigated the expression and function of Pou5f3.3 in organogenesis of Xenopus laevis. RT-PCR and immunohistochemical analysis indicated that Pou5f3.3 was expressed in a small number of adult liver cells and blood cells. Immunocytochemical investigation proved that Bmi1, a marker for hematopoietic progenitor cells, was co-expressed in Pou5f3.3-expressing small spherical cells in the peripheral blood. In anemic induction by intraperitoneal injection of phenyl hydrazine, the number of Pou5f3.3-expressing cells significantly increased within 3 days after phenyl hydrazine injection. In CRISPR/Cas mutagenesis of Pou5f3.3, Bmi1-positive hematopoietic progenitor cell count decreased in the hematopoietic dorsal-lateral plate (DLP) region, resulting in a considerable reduction in peripheral blood cells. CRISPR/Cas-induced hematopoietic deficiency was completely rescued by Pou5f3.3 supplementation, but not by Pou5f3.1 or Pou5f3.2. Transplantation experiments using the H2B-GFP transgenic line demonstrated that DLP-derived Pou5f3.3-positive and Bmi1-positive cells were translocated into the liver and bone through the bloodstream. These results suggest that Pou5f3.3 plays an essential role in the establishment and maintenance of hematopoietic progenitor cells during Xenopus development.
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Affiliation(s)
- Minami Ezawa
- Department of Life Science, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Fumika Kouno
- Department of Life Science, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Hideo Kubo
- Department of Membrane Biochemistry, Tokyo Metropolitan Institute of Medical Science, Kamikitazawa, Setagaya-ku, Tokyo, 156-8506, Japan
| | - Tetsushi Sakuma
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takashi Yamamoto
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Tsutomu Kinoshita
- Department of Life Science, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan.
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8
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Seco P, Martins GG, Jacinto A, Tavares AT. A Bird's Eye View on the Origin of Aortic Hemogenic Endothelial Cells. Front Cell Dev Biol 2020; 8:605274. [PMID: 33330505 PMCID: PMC7717972 DOI: 10.3389/fcell.2020.605274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 10/28/2020] [Indexed: 11/13/2022] Open
Abstract
During early embryogenesis, the hemogenic endothelium of the developing dorsal aorta is the main source of definitive hematopoietic stem cells (HSCs), which will generate all blood cell lineages of the adult organism. The hemogenic endothelial cells (HECs) of the dorsal aorta are known to arise from the splanchnic lateral plate mesoderm. However, the specific cell lineages and developmental paths that give rise to aortic HECs are still unclear. Over the past half a century, the scientific debate on the origin of aortic HECs and HSCs has largely focused on two potential and apparently alternative birthplaces, the extraembryonic yolk sac blood islands and the intraembryonic splanchnic mesoderm. However, as we argue, both yolk sac blood islands and aortic HECs may have a common hemangioblastic origin. Further insight into aortic HEC development is being gained from fate-mapping studies that address the identity of progenitor cell lineages, rather than their physical location within the developing embryo. In this perspective article, we discuss the current knowledge on the origin of aortic HECs with a particular focus on the evidence provided by studies in the avian embryo, a model that pioneered the field of developmental hematopoiesis.
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Affiliation(s)
- Pedro Seco
- iNOVA4Health, CEDOC, NOVA Medical School, Universidade Nova de Lisboa, Lisbon, Portugal
| | - Gabriel G Martins
- Instituto Gulbenkian de Ciência, Oeiras, Portugal.,Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
| | - António Jacinto
- iNOVA4Health, CEDOC, NOVA Medical School, Universidade Nova de Lisboa, Lisbon, Portugal
| | - Ana Teresa Tavares
- iNOVA4Health, CEDOC, NOVA Medical School, Universidade Nova de Lisboa, Lisbon, Portugal
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9
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Melchert J, Henningfeld KA, Richts S, Lingner T, Jonigk D, Pieler T. The secreted BMP antagonist ERFE is required for the development of a functional circulatory system in Xenopus. Dev Biol 2019; 459:138-148. [PMID: 31846624 DOI: 10.1016/j.ydbio.2019.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 12/03/2019] [Accepted: 12/12/2019] [Indexed: 01/24/2023]
Abstract
The hormone Erythroferrone (ERFE) is a member of the C1q/TNF-related protein family that regulates iron homeostasis through the suppression of hamp. In a gain of function screen in Xenopus embryos, we identified ERFE as a potent secondary axis-inducing agent. Experiments in Xenopus embryos and ectodermal explants revealed that ERFE functions as a selective inhibitor of the BMP pathway and the conserved C1q domain is not required for this activity. Inhibition occurs at the extracelluar level, through the interaction of ERFE with the BMP ligand. During early Xenopus embryogenesis, erfe is first expressed in the ventral blood islands where initial erythropoiesis occurs and later in circulating blood cells. ERFE knockdown does not alter the expression of etv.2, aplnr and flt1 in tailbud stage embryos indicating endothelial cell specification is independent of ERFE. However, in tadpole embryos, defects of the vascular network and primitive blood circulation are observed as well as edema formation. RNAseq analysis of ERFE morphant embryos also revealed the inhibition of gja4 indicating disruption of dorsal aorta formation.
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Affiliation(s)
- Juliane Melchert
- Institute of Developmental Biochemistry, University Medical Center Göttingen, Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Justus-von-Liebig-Weg 11, 37077, Goettingen, Germany.
| | - Kristine A Henningfeld
- Institute of Developmental Biochemistry, University Medical Center Göttingen, Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Justus-von-Liebig-Weg 11, 37077, Goettingen, Germany
| | - Sven Richts
- Institute of Developmental Biochemistry, University Medical Center Göttingen, Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Justus-von-Liebig-Weg 11, 37077, Goettingen, Germany
| | - Thomas Lingner
- Transcriptome and Genome Analysis Laboratory, University Medical Center Göttingen, Justus-von-Liebig-Weg 11, 37077, Göttingen, Germany
| | - Danny Jonigk
- Institut für Pathologie, Medizinische Hochschule Hannover (MHH) Hannover, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
| | - Tomas Pieler
- Institute of Developmental Biochemistry, University Medical Center Göttingen, Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Justus-von-Liebig-Weg 11, 37077, Goettingen, Germany
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10
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Abstract
Evidence of the diversity and multi-layered organization of the hematopoietic system is leading to new insights that may inform ex vivo production of blood cells. Interestingly, not all long-lived hematopoietic cells derive from hematopoietic stem cells (HSCs). Here we review the current knowledge on HSC-dependent cell lineages and HSC-independent tissue-resident hematopoietic cells and how they arise during embryonic development. Classical embryological and genetic experiments, cell fate tracing data, single-cell imaging, and transcriptomics studies provide information on the molecular/cell trajectories that form the complete hematopoietic system. We also discuss the current developmentally informed efforts toward generating engraftable and multilineage blood cells.
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Affiliation(s)
- Elaine Dzierzak
- MRC Centre for Inflammation Research, University of Edinburgh, Queen's Medical Research Institute, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.
| | - Anna Bigas
- Program in Cancer Research, Institut Hospital del Mar d'Investigacions Mèdiques, CIBERONC, Dr. Aiguader 88, 08003, Barcelona, Spain.
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11
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Shen J, Lyu C, Zhu Y, Feng Z, Zhang S, Hoyle DL, Ji G, Brodsky RA, Cheng T, Wang ZZ. Defining early hematopoietic-fated primitive streak specification of human pluripotent stem cells by the orchestrated balance of Wnt, activin, and BMP signaling. J Cell Physiol 2019; 234:16136-16147. [PMID: 30740687 PMCID: PMC6689260 DOI: 10.1002/jcp.28272] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 01/16/2019] [Accepted: 01/22/2019] [Indexed: 01/25/2023]
Abstract
Distinct regions of the primitive streak (PS) have diverse potential to differentiate into several tissues, including the hematopoietic lineage originated from the posterior region of PS. Although various signaling pathways have been identified to promote the development of PS and its mesoderm derivatives, there is a large gap in our understanding of signaling pathways that regulate the hematopoietic fate of PS. Here, we defined the roles of Wnt, activin, and bone morphogenetic protein (BMP) signaling pathways in generating hematopoietic-fated PS from human pluripotent stem cells (hPSCs). We found that the synergistic balance of these signaling pathways was crucial for controlling the PS fate determination towards hematopoietic lineage via mesodermal progenitors. Although the induction of PS depends largely on the Wnt and activin signaling, the PS generated without BMP4 lacks the hematopoietic potential, indicating that the BMP signaling is necessary for the PS to acquire hematopoietic property. Appropriate levels of Wnt signaling is crucial for the development of PS and its specification to the hematopoietic lineage. Although the development of PS is less sensitive to activin or BMP signaling, the fate of PS to mesoderm progenitors and subsequent hematopoietic lineage is determined by appropriate levels of activin or BMP signaling. Collectively, our study demonstrates that Wnt, activin, and BMP signaling pathways play cooperative and distinct roles in regulating the fate determination of PS for hematopoietic development. Our understanding of the regulatory networks of hematopoietic-fated PS would provide important insights into early hematopoietic patterning and possible guidance for generating functional hematopoietic cells from hPSCs in vitro.
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Affiliation(s)
- Jun Shen
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, China,Division of Hematology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Cuicui Lyu
- Department of Hematology, the First Central Hospital of Tianjin, Tianjin, China
| | - Yaoyao Zhu
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, China
| | - Zicen Feng
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, China
| | - Shuo Zhang
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, China,Division of Hematology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Dixie L. Hoyle
- Division of Hematology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Guangzhen Ji
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, China
| | - Robert A. Brodsky
- Division of Hematology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Tao Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin, China,Collaborative Innovation Center for Cancer Medicine, Tianjin, China,Tianjin Key Laboratory of Blood Cell Therapy and Technology, Tianjin, China,Correspondence Zack Z. Wang, Division of Hematology, Johns Hopkins University School of Medicine, 720 Rutland Ave, Ross 1029, Baltimore, MD 21205, USA. ., Tao Cheng, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science, 288 Nanjing Rd, Tianjin 300020, China.
| | - Zack Z. Wang
- Division of Hematology, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Correspondence Zack Z. Wang, Division of Hematology, Johns Hopkins University School of Medicine, 720 Rutland Ave, Ross 1029, Baltimore, MD 21205, USA. ., Tao Cheng, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Science, 288 Nanjing Rd, Tianjin 300020, China.
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12
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Dissecting BMP signaling input into the gene regulatory networks driving specification of the blood stem cell lineage. Proc Natl Acad Sci U S A 2018; 114:5814-5821. [PMID: 28584091 DOI: 10.1073/pnas.1610615114] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Hematopoietic stem cells (HSCs) that sustain lifelong blood production are created during embryogenesis. They emerge from a specialized endothelial population, termed hemogenic endothelium (HE), located in the ventral wall of the dorsal aorta (DA). In Xenopus, we have been studying the gene regulatory networks (GRNs) required for the formation of HSCs, and critically found that the hemogenic potential is defined at an earlier time point when precursors to the DA express hematopoietic as well as endothelial genes, in the definitive hemangioblasts (DHs). The GRN for DH programming has been constructed and, here, we show that bone morphogenetic protein (BMP) signaling is essential for the initiation of this GRN. BMP2, -4, and -7 are the principal ligands expressed in the lineage forming the HE. To investigate the requirement and timing of all BMP signaling in HSC ontogeny, we have used a transgenic line, which inducibly expresses an inhibitor of BMP signaling, Noggin, as well as a chemical inhibitor of BMP receptors, DMH1, and described the inputs from BMP signaling into the DH GRN and the HE, as well as into primitive hematopoiesis. BMP signaling is required in at least three points in DH programming: first to initiate the DH GRN through gata2 expression, then for kdr expression to enable the DH to respond to vascular endothelial growth factor A (VEGFA) ligand from the somites, and finally for gata2 expression in the DA, but is dispensable for HE specification after hemangioblasts have been formed.
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13
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Briggs JA, Weinreb C, Wagner DE, Megason S, Peshkin L, Kirschner MW, Klein AM. The dynamics of gene expression in vertebrate embryogenesis at single-cell resolution. Science 2018; 360:science.aar5780. [PMID: 29700227 DOI: 10.1126/science.aar5780] [Citation(s) in RCA: 346] [Impact Index Per Article: 57.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 04/16/2018] [Indexed: 12/11/2022]
Abstract
Time series of single-cell transcriptome measurements can reveal dynamic features of cell differentiation pathways. From measurements of whole frog embryos spanning zygotic genome activation through early organogenesis, we derived a detailed catalog of cell states in vertebrate development and a map of differentiation across all lineages over time. The inferred map recapitulates most if not all developmental relationships and associates new regulators and marker genes with each cell state. We find that many embryonic cell states appear earlier than previously appreciated. We also assess conflicting models of neural crest development. Incorporating a matched time series of zebrafish development from a companion paper, we reveal conserved and divergent features of vertebrate early developmental gene expression programs.
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Affiliation(s)
- James A Briggs
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Caleb Weinreb
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Daniel E Wagner
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Sean Megason
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Leonid Peshkin
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Marc W Kirschner
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.
| | - Allon M Klein
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.
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14
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Lempereur A, Canto PY, Richard C, Martin S, Thalgott J, Raymond K, Lebrin F, Drevon C, Jaffredo T. The TGFβ pathway is a key player for the endothelial-to-hematopoietic transition in the embryonic aorta. Dev Biol 2017; 434:292-303. [PMID: 29253505 DOI: 10.1016/j.ydbio.2017.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 12/07/2017] [Accepted: 12/08/2017] [Indexed: 12/30/2022]
Abstract
The embryonic aorta produces hematopoietic stem and progenitor cells from a hemogenic endothelium localized in the aortic floor through an endothelial to hematopoietic transition. It has been long proposed that the Bone Morphogenetic Protein (BMP)/Transforming Growth Factor ß (TGFß) signaling pathway was implicated in aortic hematopoiesis but the very nature of the signal was unknown. Here, using thorough expression analysis of the BMP/TGFß signaling pathway members in the endothelial and hematopoietic compartments of the aorta at pre-hematopoietic and hematopoietic stages, we show that the TGFß pathway is preferentially balanced with a prominent role of Alk1/TgfßR2/Smad1 and 5 on both chicken and mouse species. Functional analysis using embryonic stem cells mutated for Acvrl1 revealed an enhanced propensity to produce hematopoietic cells. Collectively, we reveal that TGFß through the Alk1/TgfßR2 receptor axis is acting on endothelial cells to produce hematopoiesis.
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Affiliation(s)
- A Lempereur
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - P Y Canto
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - C Richard
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - S Martin
- CNRS UMR 7241/INSERM U1050, Center for Interdisciplinary Research in Biology, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris CEDEX 05, France; MEMOLIFE Laboratory of Excellence and Paris Sciences et Lettres Research University, France
| | - J Thalgott
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, Leiden, The Netherlands
| | - K Raymond
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, Leiden, The Netherlands
| | - F Lebrin
- CNRS UMR 7241/INSERM U1050, Center for Interdisciplinary Research in Biology, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris CEDEX 05, France; Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, Leiden, The Netherlands; MEMOLIFE Laboratory of Excellence and Paris Sciences et Lettres Research University, France
| | - C Drevon
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - T Jaffredo
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France.
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15
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Yvernogeau L, Robin C. Restricted intra-embryonic origin of bona fide hematopoietic stem cells in the chicken. Development 2017; 144:2352-2363. [PMID: 28526756 PMCID: PMC5536871 DOI: 10.1242/dev.151613] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 05/16/2017] [Indexed: 01/07/2023]
Abstract
Hematopoietic stem cells (HSCs), which are responsible for blood cell production, are generated during embryonic development. Human and chicken embryos share features that position the chicken as a reliable and accessible alternative model to study developmental hematopoiesis. However, the existence of HSCs has never been formally proven in chicken embryos. Here, we have established a complete cartography and quantification of hematopoietic cells in the aorta during development. We demonstrate the existence of bona fide HSCs, originating from the chicken embryo aorta (and not the yolk sac, allantois or head), through an in vivo transplantation assay. Embryos transplanted in ovo with GFP embryonic tissues on the chorio-allantoic membrane provided multilineage reconstitution in adulthood. Historically, most breakthrough discoveries in the field of developmental hematopoiesis were first made in birds and later extended to mammals. Our study sheds new light on the avian model as a valuable system to study HSC production and regulation in vivo.
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Affiliation(s)
- Laurent Yvernogeau
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Uppsalalaan 8, Utrecht 3584 CT, The Netherlands
| | - Catherine Robin
- Hubrecht Institute-KNAW and University Medical Center Utrecht, Uppsalalaan 8, Utrecht 3584 CT, The Netherlands
- Department of Cell Biology, University Medical Center Utrecht, Utrecht 3584 EA, The Netherlands
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16
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Mao H, Xie L, Pi X. Low-Density Lipoprotein Receptor-Related Protein-1 Signaling in Angiogenesis. Front Cardiovasc Med 2017; 4:34. [PMID: 28589128 PMCID: PMC5438976 DOI: 10.3389/fcvm.2017.00034] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 05/01/2017] [Indexed: 11/13/2022] Open
Abstract
Low-density lipoprotein receptor-related protein-1 (LRP1) plays multifunctional roles in lipid homeostasis, signaling transduction, and endocytosis. It has been recognized as an endocytic receptor for many ligands and is involved in the signaling pathways of many growth factors or cytokines. Dysregulation of LRP1-dependent signaling events contributes to the development of pathophysiologic processes such as Alzheimer’s disease, atherosclerosis, inflammation, and coagulation. Interestingly, recent studies have linked LRP1 with endothelial function and angiogenesis, which has been underappreciated for a long time. During zebrafish embryonic development, LRP1 is required for the formation of vascular network, especially for the venous development. LRP1 depletion in the mouse embryo proper leads to angiogenic defects and disruption of endothelial integrity. Moreover, in a mouse oxygen-induced retinopathy model, specific depletion of LRP1 in endothelial cells results in abnormal development of neovessels. These loss-of-function studies suggest that LRP1 plays a pivotal role in angiogenesis. The review addresses the recent advances in the roles of LRP1-dependent signaling during angiogenesis.
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Affiliation(s)
- Hua Mao
- Department of Medicine, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, USA
| | - Liang Xie
- Department of Medicine, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, USA
| | - Xinchun Pi
- Department of Medicine, Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX, USA
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17
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Imai Y, Ishida K, Nemoto M, Nakata K, Kato T, Maéno M. Multiple origins of embryonic and tadpole myeloid cells in Xenopus laevis. Cell Tissue Res 2017; 369:341-352. [PMID: 28374149 DOI: 10.1007/s00441-017-2601-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 02/23/2017] [Indexed: 11/25/2022]
Abstract
Rabbit anti-serum against a myeloid-cell-specific peroxidase (Mpo) of Xenopus laevis was generated to identify myeloid cells in adult and larval animals. Smears of blood samples from adult hematopoietic organs were co-stained with Mpo and with XL-2, a mouse monoclonal antibody against a leukocyte common antigen. Lymphocytes found in the thymus and spleen were XL-2+Mpo- and granulocytes found in peripheral blood cells and the spleen were XL-2+Mpo+, indicating that double-staining with these two antibodies allowed classification of the leukocyte lineages. Immunohistochemical analysis of larval organs showed that XL-2+Mpo- cells were scattered throughout the liver, whereas XL-2+Mpo+ cells were present mainly in the cortex region. Interestingly, a cluster of XL-2+Mpo+ cells was found in the region of the larval mesonephric rudiment. The ratio of XL-2+Mpo+ cells to XL-2+ cells in the mesonephric region was approximately 80%, which was much higher than that found in other hematopoietic organs. In order to elucidate the embryonic origin of the myeloid cells in the tadpole mesonephros, grafting experiments between X. laevis and X. borealis embryos were performed to trace the X. borealis cells as donor cells. Among the embryonic tissues examined, the tailbud tissue at the early neurula stage contributed greatly to the myeloid cluster in the mesonephric region at stage 48. Therefore, at least four independent origins of the myeloid cell population can be traced in the Xenopus embryo.
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Affiliation(s)
- Yasutaka Imai
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Keisuke Ishida
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Maya Nemoto
- Department of Biology, Faculty of Science, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Keisuke Nakata
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
| | - Takashi Kato
- Department of Biology, School of Education, Center for Advanced Biomedical Science, Waseda University, TWIns building, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-8480, Japan
| | - Mitsugu Maéno
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan.
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18
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Nik S, Weinreb JT, Bowman TV. Developmental HSC Microenvironments: Lessons from Zebrafish. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1041:33-53. [PMID: 29204828 DOI: 10.1007/978-3-319-69194-7_4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hematopoietic stem cells (HSCs) posses the ability to maintain the blood system of an organism from birth to adulthood. The behavior of HSCs is modulated by its microenvironment. During development, HSCs acquire the instructions to self-renew and differentiate into all blood cell fates by passing through several developmental microenvironments. In this chapter, we discuss the signals and cell types that inform HSC decisions throughout ontogeny with a focus on HSC specification, mobilization, migration, and engraftment.
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Affiliation(s)
- Sara Nik
- Gottesman Institute for Stem Cell Biology and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Joshua T Weinreb
- Gottesman Institute for Stem Cell Biology and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Teresa V Bowman
- Gottesman Institute for Stem Cell Biology and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, NY, USA. .,Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, USA. .,Departments of Molecular Biology and Medicine (Oncology), Albert Einstein College of Medicine, Bronx, NY, USA.
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19
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Ciau-Uitz A, Patient R. The embryonic origins and genetic programming of emerging haematopoietic stem cells. FEBS Lett 2016; 590:4002-4015. [PMID: 27531714 DOI: 10.1002/1873-3468.12363] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 07/26/2016] [Accepted: 08/12/2016] [Indexed: 11/10/2022]
Abstract
Haematopoietic stem cells (HSCs) emerge from the haemogenic endothelium (HE) localised in the ventral wall of the embryonic dorsal aorta (DA). The HE generates HSCs through a process known as the endothelial to haematopoietic transition (EHT), which has been visualised in live embryos and is currently under intense study. However, EHT is the culmination of multiple programming events, which are as yet poorly understood, that take place before the specification of HE. A number of haematopoietic precursor cells have been described before the emergence of definitive HSCs, but only one haematovascular progenitor, the definitive haemangioblast (DH), gives rise to the DA, HE and HSCs. DHs emerge in the lateral plate mesoderm (LPM) and have a distinct origin and genetic programme compared to other, previously described haematovascular progenitors. Although DHs have so far only been established in Xenopus embryos, evidence for their existence in the LPM of mouse and chicken embryos is discussed here. We also review the current knowledge of the origins, lineage relationships, genetic programming and differentiation of the DHs that leads to the generation of HSCs. Importantly, we discuss the significance of the gene regulatory network (GRN) that controls the programming of DHs, a better understanding of which may aid in the establishment of protocols for the de novo generation of HSCs in vitro.
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Affiliation(s)
- Aldo Ciau-Uitz
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, UK
| | - Roger Patient
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, UK
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20
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De La Garza A, Sinha A, Bowman TV. Concise Review: Hematopoietic Stem Cell Origins: Lessons from Embryogenesis for Improving Regenerative Medicine. Stem Cells Transl Med 2016; 6:60-67. [PMID: 28170201 PMCID: PMC5442726 DOI: 10.5966/sctm.2016-0110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 06/16/2016] [Indexed: 12/04/2022] Open
Abstract
Hematopoietic stem cells (HSCs) have extensive regenerative capacity to replace all blood cell types, an ability that is harnessed in the clinic for bone marrow transplantation. Finding appropriate donors remains a major limitation to more extensive usage of HSC‐based therapies. Derivation of patient‐specific HSCs from pluripotent stem cells offers great promise to remedy this problem if scientists could crack the code on how to make robust, transplantable HSCs in a dish. Studies delving into the native origins of HSC production during embryonic development should supply the necessary playbook. This review presents recent discoveries from animal models, with a focus on zebrafish, and discusses the implications of these new advances in the context of prior knowledge. The focus is on the latest research exploring the role of epigenetic regulation, signaling pathways, and niche components needed for proper HSC formation. These studies provide new directions that should be explored for de novo generation and expansion of HSCs for regenerative therapies. Stem Cells Translational Medicine2017;6:60–67
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Affiliation(s)
- Adriana De La Garza
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York, USA
- Gottesman Institute for Stem Cell Biology and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Arpan Sinha
- Division of Pediatric Hematology/Oncology, Children's Hospital at Montefiore, Bronx, New York, USA
| | - Teresa V. Bowman
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York, USA
- Gottesman Institute for Stem Cell Biology and Regenerative Medicine, Albert Einstein College of Medicine, Bronx, New York, USA
- Department of Medicine (Oncology), Albert Einstein College of Medicine, Bronx, New York, USA
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21
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22
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Meinhardt H. Dorsoventral patterning by the Chordin-BMP pathway: a unified model from a pattern-formation perspective for drosophila, vertebrates, sea urchins and nematostella. Dev Biol 2015; 405:137-48. [DOI: 10.1016/j.ydbio.2015.05.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 05/14/2015] [Indexed: 01/15/2023]
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23
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Palpant NJ, Pabon L, Roberts M, Hadland B, Jones D, Jones C, Moon RT, Ruzzo WL, Bernstein I, Zheng Y, Murry CE. Inhibition of β-catenin signaling respecifies anterior-like endothelium into beating human cardiomyocytes. Development 2015; 142:3198-209. [PMID: 26153229 PMCID: PMC4582173 DOI: 10.1242/dev.117010] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 05/26/2015] [Indexed: 01/14/2023]
Abstract
During vertebrate development, mesodermal fate choices are regulated by interactions between morphogens such as activin/nodal, BMPs and Wnt/β-catenin that define anterior-posterior patterning and specify downstream derivatives including cardiomyocyte, endothelial and hematopoietic cells. We used human embryonic stem cells to explore how these pathways control mesodermal fate choices in vitro. Varying doses of activin A and BMP4 to mimic cytokine gradient polarization in the anterior-posterior axis of the embryo led to differential activity of Wnt/β-catenin signaling and specified distinct anterior-like (high activin/low BMP) and posterior-like (low activin/high BMP) mesodermal populations. Cardiogenic mesoderm was generated under conditions specifying anterior-like mesoderm, whereas blood-forming endothelium was generated from posterior-like mesoderm, and vessel-forming CD31+ endothelial cells were generated from all mesoderm origins. Surprisingly, inhibition of β-catenin signaling led to the highly efficient respecification of anterior-like endothelium into beating cardiomyocytes. Cardiac respecification was not observed in posterior-derived endothelial cells. Thus, activin/BMP gradients specify distinct mesodermal subpopulations that generate cell derivatives with unique angiogenic, hemogenic and cardiogenic properties that should be useful for understanding embryogenesis and developing therapeutics. Summary: The manipulation of signals that control embryonic patterning allows human pluripotent stem cells to be differentiated into endothelial subpopulations with distinct haematopoietic, angiogenic and cardiogenic potential.
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Affiliation(s)
- Nathan J Palpant
- Department of Pathology, University of Washington School of Medicine, Seattle, WA 98109, USA Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Lil Pabon
- Department of Pathology, University of Washington School of Medicine, Seattle, WA 98109, USA Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Meredith Roberts
- Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Brandon Hadland
- Department of Pediatrics, University of Washington School of Medicine, Seattle, WA 98109, USA Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Daniel Jones
- Department of Computer Science and Engineering, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Christina Jones
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA Department of Pharmacology, University of Washington School of Medicine, Seattle, WA 98109, USA Howard Hughes Medical Institute, Seattle, WA 98109, USA
| | - Randall T Moon
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA Department of Pharmacology, University of Washington School of Medicine, Seattle, WA 98109, USA Howard Hughes Medical Institute, Seattle, WA 98109, USA
| | - Walter L Ruzzo
- Department of Computer Science and Engineering, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Irwin Bernstein
- Department of Pediatrics, University of Washington School of Medicine, Seattle, WA 98109, USA Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Ying Zheng
- Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Charles E Murry
- Department of Pathology, University of Washington School of Medicine, Seattle, WA 98109, USA Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA Department of Medicine/Cardiology, University of Washington School of Medicine, Seattle, WA 98109, USA
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24
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Charpentier MS, Tandon P, Trincot CE, Koutleva EK, Conlon FL. A distinct mechanism of vascular lumen formation in Xenopus requires EGFL7. PLoS One 2015; 10:e0116086. [PMID: 25705891 PMCID: PMC4338030 DOI: 10.1371/journal.pone.0116086] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 12/04/2014] [Indexed: 01/03/2023] Open
Abstract
During vertebrate blood vessel development, lumen formation is the critical process by which cords of endothelial cells transition into functional tubular vessels. Here, we use Xenopus embryos to explore the cellular and molecular mechanisms underlying lumen formation of the dorsal aorta and the posterior cardinal veins, the primary major vessels that arise via vasculogenesis within the first 48 hours of life. We demonstrate that endothelial cells are initially found in close association with one another through the formation of tight junctions expressing ZO-1. The emergence of vascular lumens is characterized by elongation of endothelial cell shape, reorganization of junctions away from the cord center to the periphery of the vessel, and onset of Claudin-5 expression within tight junctions. Furthermore, unlike most vertebrate vessels that exhibit specialized apical and basal domains, we show that early Xenopus vessels are not polarized. Moreover, we demonstrate that in embryos depleted of the extracellular matrix factor Epidermal Growth Factor-Like Domain 7 (EGFL7), an evolutionarily conserved factor associated with vertebrate vessel development, vascular lumens fail to form. While Claudin-5 localizes to endothelial tight junctions of EGFL7-depleted embryos in a timely manner, endothelial cells of the aorta and veins fail to undergo appropriate cell shape changes or clear junctions from the cell-cell contact. Taken together, we demonstrate for the first time the mechanisms by which lumens are generated within the major vessels in Xenopus and implicate EGFL7 in modulating cell shape and cell-cell junctions to drive proper lumen morphogenesis.
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Affiliation(s)
- Marta S. Charpentier
- University of North Carolina McAllister Heart Institute, UNC-CH, Chapel Hill, North Carolina, United States of America
- Department of Genetics and Molecular Biology, UNC-CH, Chapel Hill, North Carolina, United States of America
| | - Panna Tandon
- University of North Carolina McAllister Heart Institute, UNC-CH, Chapel Hill, North Carolina, United States of America
- Department of Genetics and Molecular Biology, UNC-CH, Chapel Hill, North Carolina, United States of America
| | - Claire E. Trincot
- University of North Carolina McAllister Heart Institute, UNC-CH, Chapel Hill, North Carolina, United States of America
- Department of Genetics and Molecular Biology, UNC-CH, Chapel Hill, North Carolina, United States of America
| | - Elitza K. Koutleva
- University of North Carolina McAllister Heart Institute, UNC-CH, Chapel Hill, North Carolina, United States of America
- Department of Biology, UNC-CH, Chapel Hill, North Carolina, United States of America
| | - Frank L. Conlon
- University of North Carolina McAllister Heart Institute, UNC-CH, Chapel Hill, North Carolina, United States of America
- Department of Genetics and Molecular Biology, UNC-CH, Chapel Hill, North Carolina, United States of America
- Department of Biology, UNC-CH, Chapel Hill, North Carolina, United States of America
- Lineberger Comprehensive Cancer Center, UNC-CH, Chapel Hill, North Carolina, United States of America
- * E-mail:
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25
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Pax8 and Pax2 are specifically required at different steps of Xenopus pronephros development. Dev Biol 2014; 397:175-90. [PMID: 25446030 DOI: 10.1016/j.ydbio.2014.10.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 10/07/2014] [Accepted: 10/26/2014] [Indexed: 11/23/2022]
Abstract
The respective role of Pax2 and Pax8 in early kidney development in vertebrates is poorly understood. In this report, we have studied the roles of Pax8 and Pax2 in Xenopus pronephros development using a loss-of-function approach. Our results highlight a differential requirement of these two transcription factors for proper pronephros formation. Pax8 is necessary for the earliest steps of pronephric development and its depletion leads to a complete absence of pronephric tubule. Pax2 is required after the establishment of the tubule pronephric anlage, for the expression of several terminal differentiation markers of the pronephric tubule. Neither Pax2 nor Pax8 is essential to glomus development. We further show that Pax8 controls hnf1b, but not lhx1 and Osr2, expression in the kidney field as soon as the mid-neurula stage. Pax8 is also required for cell proliferation of pronephric precursors in the kidney field. It may exert its action through the wnt/beta-catenin pathway since activation of this pathway can rescue MoPax8 induced proliferation defect and Pax8 regulates expression of the wnt pathway components, dvl1 and sfrp3. Finally, we observed that loss of pronephros in Pax8 morphants correlates with an expanded vascular/blood gene expression domain indicating that Pax8 function is important to delimit the blood/endothelial genes expression domain in the anterior part of the dorso-lateral plate.
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Sakata H, Maéno M. Nkx2.5 is involved in myeloid cell differentiation at anterior ventral blood islands in the Xenopus embryo. Dev Growth Differ 2014; 56:544-54. [PMID: 25283688 DOI: 10.1111/dgd.12155] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 07/22/2014] [Accepted: 07/23/2014] [Indexed: 11/28/2022]
Abstract
We have shown previously that two populations of myeloid cells emerge in the anterior and posterior ventral blood islands (aVBI and pVBI) at the different stages in Xenopus laevis embryo. In order to elucidate the regulatory mechanism of myeloid cell differentiation in the aVBI, we examined the role of Nkx2.5, an essential transcription factor for heart differentiation, in regulation of the myeloid cell differentiation in this region. Knockdown of endogenous Nkx2.5 by introducing MO into the dorsal marginal zone (DMZ) suppressed the expression of MHCα as well as that of mpo and spib in the resultant embryos and in DMZ explants made from the injected embryos. Expression of c/ebpα was less affected in the embryos injected with Nkx2.5 MO. The effect of Nkx2.5 MO in myeloid cell differentiation was recovered by coinjection of nkx2.5 or c/ebpα mRNA, indicating that Nkx2.5 functions at the same or the upper level of C/EBPα for the specification of myeloid cells. An attempt to identify transcription factors for myeloid cell differentiation in ventral marginal zone (VMZ) explants demonstrated that coinjection of two transcription factors out of three factors, namely C/EBPα, Nkx2.5 and GATA4, was sufficient to induce a certain amount of mpo expression. We suggest that C/EBPα is an unequivocal factor for myeloid cell differentiation in the aVBI and that Nkx2.5 and GATA4 cooperate with C/EBPα for promotion of myeloid cell differentiation.
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Affiliation(s)
- Hiroyuki Sakata
- Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata, 950-2181, Japan
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Developmental hematopoiesis: ontogeny, genetic programming and conservation. Exp Hematol 2014; 42:669-83. [PMID: 24950425 DOI: 10.1016/j.exphem.2014.06.001] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 05/15/2014] [Accepted: 06/09/2014] [Indexed: 02/01/2023]
Abstract
Hematopoietic stem cells (HSCs) sustain blood production throughout life and are of pivotal importance in regenerative medicine. Although HSC generation from pluripotent stem cells would resolve their shortage for clinical applications, this has not yet been achieved mainly because of the poor mechanistic understanding of their programming. Bone marrow HSCs are first created during embryogenesis in the dorsal aorta (DA) of the midgestation conceptus, from where they migrate to the fetal liver and, eventually, the bone marrow. It is currently accepted that HSCs emerge from specialized endothelium, the hemogenic endothelium, localized in the ventral wall of the DA through an evolutionarily conserved process called the endothelial-to-hematopoietic transition. However, the endothelial-to-hematopoietic transition represents one of the last steps in HSC creation, and an understanding of earlier events in the specification of their progenitors is required if we are to create them from naïve pluripotent cells. Because of their ready availability and external development, zebrafish and Xenopus embryos have enormously facilitated our understanding of the early developmental processes leading to the programming of HSCs from nascent lateral plate mesoderm to hemogenic endothelium in the DA. The amenity of the Xenopus model to lineage tracing experiments has also contributed to the establishment of the distinct origins of embryonic (yolk sac) and adult (HSC) hematopoiesis, whereas the transparency of the zebrafish has allowed in vivo imaging of developing blood cells, particularly during and after the emergence of HSCs in the DA. Here, we discuss the key contributions of these model organisms to our understanding of developmental hematopoiesis.
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Lim JC, Kurihara S, Tamaki R, Mashima Y, Maéno M. Expression and localization of Rdd proteins in Xenopus embryo. Anat Cell Biol 2014; 47:18-27. [PMID: 24693479 PMCID: PMC3968263 DOI: 10.5115/acb.2014.47.1.18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 12/10/2013] [Accepted: 02/07/2014] [Indexed: 11/27/2022] Open
Abstract
The previous study has shown that repeated D domain-like (Rdd) proteins, a group of novel secretory proteins consisting of repeated domains of a cysteine-rich sequence, are involved in the process of blood vessel formation in Xenopus embryo. We performed further experiments to examine the localization of Rdd proteins in embryogenesis. Detection of tagged Rdd proteins expressed in blastomeres showed that Rdd proteins formed a high molecular weight complex and existed in the extracellular space. A rabbit antibody against the Rdd synthetic peptide identified a single band of 28 kD in embryonic tissue extract. By whole-mount immunostaining analysis, signal was detected in the regions of inter-somites, vitelline veins, and branchial arches at the tailbud stage. Staining of Rdd was remarkably reduced in the embryos injected with vascular endothelial growth factor Morpholino. We suggest that Rdd proteins interact with a molecule(s) associated with vascular precursor cells.
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Affiliation(s)
- Jong-Chan Lim
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Sayaka Kurihara
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Rie Tamaki
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Yutaka Mashima
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
| | - Mitsugu Maéno
- Graduate School of Science and Technology, Niigata University, Niigata, Japan
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Ciau-Uitz A, Wang L, Patient R, Liu F. ETS transcription factors in hematopoietic stem cell development. Blood Cells Mol Dis 2013; 51:248-55. [DOI: 10.1016/j.bcmd.2013.07.010] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 07/04/2013] [Indexed: 01/08/2023]
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BMP-mediated specification of the erythroid lineage suppresses endothelial development in blood island precursors. Blood 2013; 122:3929-39. [PMID: 24100450 DOI: 10.1182/blood-2013-03-490045] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The developmental relationship between the blood and endothelial cell (EC) lineages remains unclear. In the extra-embryonic blood islands of birds and mammals, ECs and blood cells are closely intermixed, and blood island precursor cells in the primitive streak express many of the same molecular markers, leading to the suggestion that both lineages arise from a common precursor, called the hemangioblast. Cells within the blood island of Xenopus also coexpress predifferentiation markers of the blood and EC lineages. However, using multiple assays, we find that precursor cells in the Xenopus blood island do not normally differentiate into ECs, suggesting that classic hemangioblasts are rare or nonexistent in Xenopus. What prevents these precursor cells from developing into mature ECs? We have found that bone morphogenetic protein (BMP) signaling is essential for erythroid differentiation, and in the absence of BMP signaling, precursor cells adopt an EC fate. Furthermore, inhibition of the erythroid transcription pathway leads to endothelial differentiation. Our results indicate that bipotential endothelial/erythroid precursor cells do indeed exist in the Xenopus blood island, but BMP signaling normally acts to constrain EC fate. More generally, these results provide evidence that commitment to the erythroid lineage limits development of bipotential precursors toward an endothelial fate.
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Warga RM, Mueller RL, Ho RK, Kane DA. Zebrafish Tbx16 regulates intermediate mesoderm cell fate by attenuating Fgf activity. Dev Biol 2013; 383:75-89. [PMID: 24008197 DOI: 10.1016/j.ydbio.2013.08.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 08/04/2013] [Accepted: 08/21/2013] [Indexed: 10/26/2022]
Abstract
Progenitors of the zebrafish pronephros, red blood and trunk endothelium all originate from the ventral mesoderm and often share lineage with one another, suggesting that their initial patterning is linked. Previous studies have shown that spadetail (spt) mutant embryos, defective in tbx16 gene function, fail to produce red blood cells, but retain the normal number of endothelial and pronephric cells. We report here that spt mutants are deficient in all the types of early blood, have fewer endothelial cells as well as far more pronephric cells compared to wildtype. In vivo cell tracing experiments reveal that blood and endothelium originate in spt mutants almost exclusive from the dorsal mesoderm whereas, pronephros and tail originate from both dorsal and ventral mesoderm. Together these findings suggest possible defects in posterior patterning. In accord with this, gene expression analysis shows that mesodermal derivatives within the trunk and tail of spt mutants have acquired more posterior identity. Secreted signaling molecules belonging to the Fgf, Wnt and Bmp families have been implicated as patterning factors of the posterior mesoderm. Further investigation demonstrates that Fgf and Wnt signaling are elevated throughout the nonaxial region of the spt gastrula. By manipulating Fgf signaling we show that Fgfs both promote pronephric fate and repress blood and endothelial fate. We conclude that Tbx16 plays an important role in regulating the balance of intermediate mesoderm fates by attenuating Fgf activity.
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Affiliation(s)
- Rachel M Warga
- Department of Biological Sciences, Western Michigan University, Kalamazoo, MI 49008, USA; Department of Organismal Biology and Anatomy, University of Chicago, 1027 East, 57th Street, Chicago, IL 60637, USA.
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miR-142-3p Controls the Specification of Definitive Hemangioblasts during Ontogeny. Dev Cell 2013; 26:237-49. [DOI: 10.1016/j.devcel.2013.06.023] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 05/07/2013] [Accepted: 06/23/2013] [Indexed: 02/03/2023]
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Ciau-Uitz A, Pinheiro P, Kirmizitas A, Zuo J, Patient R. VEGFA-dependent and -independent pathways synergise to drive Scl expression and initiate programming of the blood stem cell lineage in Xenopus. Development 2013; 140:2632-42. [PMID: 23637333 PMCID: PMC3666388 DOI: 10.1242/dev.090829] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/03/2013] [Indexed: 01/23/2023]
Abstract
The first haematopoietic stem cells share a common origin with the dorsal aorta and derive from putative adult haemangioblasts in the dorsal lateral plate (DLP) mesoderm. Here we show that the transcription factor (TF) stem cell leukaemia (Scl/Tal1) is crucial for development of these adult haemangioblasts in Xenopus and establish the regulatory cascade controlling its expression. We show that VEGFA produced in the somites is required to initiate adult haemangioblast programming in the adjacent DLP by establishing endogenous VEGFA signalling. This response depends on expression of the VEGF receptor Flk1, driven by Fli1 and Gata2. Scl activation requires synergy between this VEGFA-controlled pathway and a VEGFA-independent pathway controlled by Fli1, Gata2 and Etv2/Etsrp/ER71, which also drives expression of the Scl partner Lmo2. Thus, the two ETS factors Fli1 and Etv6, which drives the VEGFA expression in both somites and the DLP, sit at the top of the adult haemangioblast gene regulatory network (GRN). Furthermore, Gata2 is initially activated by Fli1 but later maintained by another ETS factor, Etv2. We also establish that Flk1 and Etv2 act independently in the two pathways to Scl activation. Thus, detailed temporal, epistatic measurements of key TFs and VEGFA plus its receptor have enabled us to build a Xenopus adult haemangioblast GRN.
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Affiliation(s)
- Aldo Ciau-Uitz
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford, OX3 9DS, UK
| | - Philip Pinheiro
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford, OX3 9DS, UK
| | - Arif Kirmizitas
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford, OX3 9DS, UK
| | - Jie Zuo
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford, OX3 9DS, UK
| | - Roger Patient
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford, OX3 9DS, UK
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Shah RR, Koniski A, Shinde M, Blythe SA, Fass DM, Haggarty SJ, Palis J, Klein PS. Regulation of primitive hematopoiesis by class I histone deacetylases. Dev Dyn 2013; 242:108-21. [PMID: 23184530 PMCID: PMC3553261 DOI: 10.1002/dvdy.23906] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 10/16/2012] [Accepted: 11/08/2012] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Histone deacetylases (HDACs) regulate multiple developmental processes and cellular functions. However, their roles in blood development have not been determined, and in Xenopus laevis a specific function for HDACs has yet to be identified. Here, we employed the class I selective HDAC inhibitor, valproic acid (VPA), to show that HDAC activity is required for primitive hematopoiesis. RESULTS VPA treatment during gastrulation resulted in a complete absence of red blood cells (RBCs) in Xenopus tadpoles, but did not affect development of other mesodermal tissues, including myeloid and endothelial lineages. These effects of VPA were mimicked by Trichostatin A (TSA), a well-established pan-HDAC inhibitor, but not by valpromide, which is structurally similar to VPA but does not inhibit HDACs. VPA also caused a marked, dose-dependent loss of primitive erythroid progenitors in mouse yolk sac explants at clinically relevant concentrations. In addition, VPA treatment inhibited erythropoietic development downstream of bmp4 and gata1 in Xenopus ectodermal explants. CONCLUSIONS These findings suggest an important role for class I HDACs in primitive hematopoiesis. Our work also demonstrates that specific developmental defects associated with exposure to VPA, a significant teratogen in humans, arise through inhibition of class I HDACs.
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Affiliation(s)
- Rishita R. Shah
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Philadelphia, PA USA 19104
| | - Anne Koniski
- Department of Pediatrics Center for Pediatric Biomedical Research University of Rochester Medical Center 601 Elmwood Ave. Rochester, NY 14642
| | - Mansi Shinde
- Pharmacology Graduate Group, University of Pennsylvania Philadelphia, PA USA 19104
| | - Shelby A. Blythe
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Philadelphia, PA USA 19104
| | - Daniel M. Fass
- Stanley Center for Psychiatric Research Broad Institute of Harvard and MIT Cambridge, MA USA 02142
- Center for Human Genetic Research, Massachusetts General Hospital, Harvard Medical School Boston, MA USA 02114
| | - Stephen J. Haggarty
- Stanley Center for Psychiatric Research Broad Institute of Harvard and MIT Cambridge, MA USA 02142
- Center for Human Genetic Research, Massachusetts General Hospital, Harvard Medical School Boston, MA USA 02114
| | - James Palis
- Department of Pediatrics Center for Pediatric Biomedical Research University of Rochester Medical Center 601 Elmwood Ave. Rochester, NY 14642
| | - Peter S. Klein
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Philadelphia, PA USA 19104
- Pharmacology Graduate Group, University of Pennsylvania Philadelphia, PA USA 19104
- Department of Medicine (Hematology/Oncology) University of Pennsylvania School of Medicine Philadelphia, PA USA 19104
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Leung A, Ciau-Uitz A, Pinheiro P, Monteiro R, Zuo J, Vyas P, Patient R, Porcher C. Uncoupling VEGFA functions in arteriogenesis and hematopoietic stem cell specification. Dev Cell 2013; 24:144-58. [PMID: 23318133 PMCID: PMC3560039 DOI: 10.1016/j.devcel.2012.12.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Revised: 10/02/2012] [Accepted: 12/04/2012] [Indexed: 01/26/2023]
Abstract
VEGFA signaling is critical for endothelial and hematopoietic stem cell (HSC) specification. However, blood defects resulting from perturbation of the VEGFA pathway are always accompanied by impaired vascular/arterial development. Because HSCs derive from arterial cells, it is unclear whether VEGFA directly contributes to HSC specification. This is an important question for our understanding of how HSCs are formed and for developing their production in vitro. Through knockdown of the regulator ETO2 in embryogenesis, we report a specific decrease in expression of medium/long Vegfa isoforms in somites. This leads to absence of Notch1 expression and failure of HSC specification in the dorsal aorta (DA), independently of vessel formation and arterial specification. Vegfa hypomorphs and isoform-specific (medium/long) morphants not only recapitulate this phenotype but also demonstrate that VEGFA short isoform is sufficient for DA development. Therefore, sequential, isoform-specific VEGFA signaling successively induces the endothelial, arterial, and HSC programs in the DA.
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Affiliation(s)
- Amy Leung
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford University, OX3 9DS Oxford, UK
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Tsao KC, Tu CF, Lee SJ, Yang RB. Zebrafish scube1 (signal peptide-CUB (complement protein C1r/C1s, Uegf, and Bmp1)-EGF (epidermal growth factor) domain-containing protein 1) is involved in primitive hematopoiesis. J Biol Chem 2012; 288:5017-26. [PMID: 23271740 DOI: 10.1074/jbc.m112.375196] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
scube1 (signal peptide-CUB (complement protein C1r/C1s, Uegf, and Bmp1)-EGF domain-containing protein 1), the founding member of a novel secreted and cell surface SCUBE protein family, is expressed predominantly in various developing tissues in mice. However, its function in primitive hematopoiesis remains unknown. In this study, we identified and characterized zebrafish scube1 and analyzed its function by injecting antisense morpholino-oligonucleotide into embryos. Whole-mount in situ hybridization revealed that zebrafish scube1 mRNA is maternally expressed and widely distributed during early embryonic development. Knockdown of scube1 by morpholino-oligonucleotide down-regulated the expression of marker genes associated with early primitive hematopoietic precursors (scl) and erythroid (gata1 and hbbe1), as well as early (pu.1) and late (mpo and l-plastin) myelomonocytic lineages. However, the expression of an early endothelial marker fli1a and vascular morphogenesis appeared normal in scube1 morphants. Overexpression of bone morphogenetic protein (bmp) rescued the expression of scl in the posterior lateral mesoderm during early primitive hematopoiesis in scube1 morphants. Biochemical and molecular analysis revealed that Scube1 could be a BMP co-receptor to augment BMP signaling. Our results suggest that scube1 is critical for and functions at the top of the regulatory hierarchy of primitive hematopoiesis by modulating BMP activity during zebrafish embryogenesis.
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Affiliation(s)
- Ku-Chi Tsao
- Institute of Biomedical Sciences, Taiwan International Graduate Program, Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
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Marks-Bluth J, Pimanda JE. Cell signalling pathways that mediate haematopoietic stem cell specification. Int J Biochem Cell Biol 2012; 44:2175-84. [DOI: 10.1016/j.biocel.2012.09.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Revised: 09/09/2012] [Accepted: 09/10/2012] [Indexed: 01/27/2023]
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Maéno M, Komiyama K, Matsuzaki Y, Hosoya J, Kurihara S, Sakata H, Izutsu Y. Distinct mechanisms control the timing of differentiation of two myeloid populations in Xenopus ventral blood islands. Dev Growth Differ 2012; 54:187-201. [PMID: 22470938 DOI: 10.1111/j.1440-169x.2011.01321.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Previous study has suggested that distinct populations of myeloid cells exist in the anterior ventral blood islands (aVBI) and posterior ventral blood islands (pVBI) in Xenopus neurula embryo. However, details for differentiation programs of these two populations have not been elucidated. In the present study, we examined the role of Wnt, vascular endothelial growth factor (VEGF) and fibroblast growth factor signals in the regulation of myeloid cell differentiation in the dorsal marginal zone and ventral marginal zone explants that are the sources of myeloid cells in the aVBI and pVBI. We found that regulation of Wnt activity is essential for the differentiation of myeloid cells in the aVBI but is not required for the differentiation of myeloid cells in the pVBI. Endogenous activity of the VEGF signal is necessary for differentiation of myeloid cells in the pVBI but is not involved in the differentiation of myeloid cells in the aVBI. Overall results reveal that distinct mechanisms are involved in the myeloid, erythroid and endothelial cell differentiation in the aVBI and pVBI.
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Affiliation(s)
- Mitsugu Maéno
- Department of Biology, Faculty of Science, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata 950-2181, Japan.
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Abstract
Hematopoiesis is the process that generates all the cell types of the blood, which are responsible for oxygen transport and immune defense. It has been now more than 50 years from the demonstration that blood cells derive from a common ancestor called Hematopoietic Stem Cell (HSC) McCulloch and Till (1960). Thus, the hematopoietic process relies on the unlimited and distinctive self-renewal ability of HSC, which in the adult mammalian organisms reside in the bone marrow, but their generation occurs during embryonic life. Questions still remain about how HSCs acquire and maintain the features of self-renewal and pluripotency that define stem-cell populations. Notch is a crucial signaling pathway involved in the generation of cell diversity and stem-cell maintenance in different systems. In some cases, Notch prevents differentiation, while in other contexts Notch directly participates in promoting cell differentiation. In the following sections, we will review what is known about the role of Notch in HSC establishment and hematopoietic cell lineage specification.
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Garriock RJ, Mikawa T. Early arterial differentiation and patterning in the avian embryo model. Semin Cell Dev Biol 2011; 22:985-92. [PMID: 22020129 DOI: 10.1016/j.semcdb.2011.09.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 09/26/2011] [Accepted: 09/29/2011] [Indexed: 01/04/2023]
Abstract
Of the many models to study vascular biology the avian embryo remains an informative and powerful model system that has provided important insights into endothelial cell recruitment, assembly and remodeling during development of the circulatory system. This review highlights several discoveries in the avian system that show how arterial patterning is regulated using the model of dorsal aortae development along the embryo midline during gastrulation and neurulation. These discoveries were made possible through spatially and temporally controlled gain-of-function experiments that provided direct evidence that BMP signaling plays a pivotal role in vascular recruitment, patterning and remodeling and that Notch-signaling recruits vascular precursor cells to the dorsal aortae. Importantly, BMP ligands are broadly expressed throughout embryos but BMP signaling activation region is spatially defined by precisely regulated expression of BMP antagonists. These discoveries provide insight into how signaling, both positive and negative, regulate vascular patterning. This review also illustrates similarities of early arterial patterning along the embryonic midline in amniotes both avian and mammalians including human, evolutionarily specialized from non-amniotes such as fish and frog.
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Simões FC, Peterkin T, Patient R. Fgf differentially controls cross-antagonism between cardiac and haemangioblast regulators. Development 2011; 138:3235-45. [PMID: 21750034 DOI: 10.1242/dev.059634] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Fibroblast growth factor (Fgf) has been implicated in the control of heart size during development, although whether this is by controlling cell fate, survival or proliferation has not been clear. Here, we show that Fgf, without affecting survival or proliferation, acts during gastrulation to drive cardiac fate and restrict anterior haemangioblast fate in zebrafish embryos. The haemangioblast programme was thought to be activated before the cardiac programme and is repressive towards it, suggesting that activation by Fgf of the cardiac programme might be via suppression of the haemangioblast programme. However, we show that the cardiac regulator nkx2.5 can also repress the haemangioblast programme and, furthermore, that cardiac specification still requires Fgf signalling even when haemangioblast regulators are independently suppressed. We further show that nkx2.5 and the cloche candidate gene lycat are expressed during gastrulation and regulated by Fgf, and that nkx2.5 overexpression, together with loss of the lycat targets etsrp and scl can stably induce expansion of the heart. We conclude that Fgf controls cardiac and haemangioblast fates by the simultaneous regulation of haemangioblast and cardiac regulators. We propose that elevation of Fgf signalling in the anterior haemangioblast territory could have led to its recruitment into the heart field during evolution, increasing the size of the heart.
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Affiliation(s)
- Filipa Costa Simões
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, John Radcliffe Hospital, Headington OX3 9DS, UK
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42
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Dush MK, McIver AL, Parr MA, Young DD, Fisher J, Newman DR, Sannes PL, Hauck ML, Deiters A, Nascone-Yoder N. Heterotaxin: a TGF-β signaling inhibitor identified in a multi-phenotype profiling screen in Xenopus embryos. ACTA ACUST UNITED AC 2011; 18:252-63. [PMID: 21338922 DOI: 10.1016/j.chembiol.2010.12.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 12/03/2010] [Accepted: 12/05/2010] [Indexed: 12/23/2022]
Abstract
Disruptions of anatomical left-right asymmetry result in life-threatening heterotaxic birth defects in vital organs. We performed a small molecule screen for left-right asymmetry phenotypes in Xenopus embryos and discovered a pyridine analog, heterotaxin, which disrupts both cardiovascular and digestive organ laterality and inhibits TGF-β-dependent left-right asymmetric gene expression. Heterotaxin analogs also perturb vascular development, melanogenesis, cell migration, and adhesion, and indirectly inhibit the phosphorylation of an intracellular mediator of TGF-β signaling. This combined phenotypic profile identifies these compounds as a class of TGF-β signaling inhibitors. Notably, heterotaxin analogs also possess highly desirable antitumor properties, inhibiting epithelial-mesenchymal transition, angiogenesis, and tumor cell proliferation in mammalian systems. Our results suggest that assessing multiple organ, tissue, cellular, and molecular parameters in a whole organism context is a valuable strategy for identifying the mechanism of action of bioactive compounds.
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Affiliation(s)
- Michael K Dush
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh, NC 27606, USA
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The role of the GATA2 transcription factor in normal and malignant hematopoiesis. Crit Rev Oncol Hematol 2011; 82:1-17. [PMID: 21605981 DOI: 10.1016/j.critrevonc.2011.04.007] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 03/18/2011] [Accepted: 04/21/2011] [Indexed: 11/23/2022] Open
Abstract
Hematopoiesis involves an elaborate regulatory network of transcription factors that coordinates the expression of multiple downstream genes, and maintains homeostasis within the hematopoietic system through the accurate orchestration of cellular proliferation, differentiation and survival. As a result, defects in the expression levels or the activity of these transcription factors are intimately linked to hematopoietic disorders, including leukemia. The GATA family of nuclear regulatory proteins serves as a prototype for the action of lineage-restricted transcription factors. GATA1 and GATA2 are expressed principally in hematopoietic lineages, and have essential roles in the development of multiple hematopoietic cells, including erythrocytes and megakaryocytes. Moreover, GATA2 is crucial for the proliferation and maintenance of hematopoietic stem cells and multipotential progenitors. In this review, we summarize the current knowledge regarding the biological properties and functions of the GATA2 transcription factor in normal and malignant hematopoiesis.
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Neuhaus H, Müller F, Hollemann T. Xenopus er71 is involved in vascular development. Dev Dyn 2011; 239:3436-45. [PMID: 21069823 DOI: 10.1002/dvdy.22487] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Vasculogenesis and hematopoiesis are closely linked in developing vertebrates. Recently, the existence of a common progenitor of these two tissues, the hemangioblast, has been demonstrated in different organisms. In Xenopus early vascular and hematopoietic cells differentiate in a region called the anterior ventral blood island (aVBI). Differentiating cells from this region migrate out to form embryonic blood and part of the vascular structures of the early frog embryo. A number of members of the ETS family of transcription factors are expressed in endothelial cells and some of them play important roles at various stages of vascular development. The loss of ER71 function in mice led to a complete loss of blood and vascular structures. Similarly, knock down of the zebrafish homolog of er71, etsrp, greatly affected development of vascular structures and myeloid cells. We have identified the Xenopus ortholog of er71 and could show that er71 function in Xenopus is required for vasculogenesis, but not for the development of hematopoietic cells.
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Affiliation(s)
- Herbert Neuhaus
- Martin-Luther-University Halle-Wittenberg, Institute for Physiological Chemistry, Halle, Germany.
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Kamei CN, Kempf H, Yelin R, Daoud G, James RG, Lassar AB, Tabin CJ, Schultheiss TM. Promotion of avian endothelial cell differentiation by GATA transcription factors. Dev Biol 2011; 353:29-37. [PMID: 21354132 DOI: 10.1016/j.ydbio.2011.02.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Revised: 02/14/2011] [Accepted: 02/15/2011] [Indexed: 11/30/2022]
Abstract
In the avian embryo, endothelial cells originate from several sources, including the lateral plate and somite mesoderm. In this study, we show that Gata transcription factors are expressed in the lateral plate and in vasculogenic regions of the avian somite and are able to promote a vascular endothelial fate when ectopically expressed in somite precursors. A fusion of GATA4 to the transcriptional activator VP16 promoted endothelium formation, indicating that GATA transcription factors promote vasculogenesis via activation of downstream targets, while a fusion of GATA4 to the transcriptional repressor engrailed repressed expression of Vascular Endothelial Growth Factor Receptor 2, a marker of endothelial precursors. These findings indicate a role for GATA transcription factors in the differentiation of the endothelium.
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Affiliation(s)
- Caramai N Kamei
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
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Wnt/beta-catenin signaling is involved in the induction and maintenance of primitive hematopoiesis in the vertebrate embryo. Proc Natl Acad Sci U S A 2010; 107:16160-5. [PMID: 20805504 DOI: 10.1073/pnas.1007725107] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The formation of primitive (embryonic) blood in vertebrates is mediated by spatio-temporally restricted signaling between different tissue layers. In Xenopus, in which primitive blood originates in the ventral blood island, this involves the secretion of bone morphogenetic protein (BMP) ligands by the ectoderm that signal to the underlying mesoderm during gastrulation. Using novel transgenic reporter lines, we report that the canonical Wnt/β-catenin pathway is also activated in the blood islands in Xenopus. Furthermore, Wnt-reporter activity was also detected in the blood islands of the mouse yolk sac. By using morpholino-mediated depletion in Xenopus, we identified Wnt4 as the ligand that is expressed in the mesoderm of the ventral blood island and is essential for the expression of hematopoietic and erythroid marker genes. Injection of an inducible Wnt-interfering construct further showed that, during gastrulation, Wnt/β-catenin signaling is required both in the mesoderm and in the overlying ectoderm for the formation of the ventral blood island. Using recombination assays with embryonic explants, we document that ectodermal BMP4 expression is dependent on Wnt4 signals from the mesoderm. Our results thus reveal a unique role for Wnt4-mediated canonical signaling in the formation and maintenance of the ventral blood island in Xenopus.
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Ciau-Uitz A, Pinheiro P, Gupta R, Enver T, Patient R. Tel1/ETV6 specifies blood stem cells through the agency of VEGF signaling. Dev Cell 2010; 18:569-78. [PMID: 20412772 DOI: 10.1016/j.devcel.2010.02.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 01/07/2010] [Accepted: 02/05/2010] [Indexed: 01/17/2023]
Abstract
The regulation of stem cell ontogeny is poorly understood. We show that the leukemia-associated Ets transcription factor, Tel1/ETV6, specifies the first hematopoietic stem cells (HSCs) in the dorsal aorta (DA). In contrast, Tel1/ETV6 has little effect on embryonic blood formation, further distinguishing the programming of the long- and short-term blood populations. Consistent with the notion of concordance of arterial and HSC programs, we show that Tel1/ETV6 is also required for the specification of the DA as an artery. We further show that Tel1/ETV6 acts by regulating the transcription of VegfA in both the lateral plate mesoderm and also in the somites. Exogenous VEGFA rescues Tel1/ETV6 morphants, and depletion of VEGFA or its receptor, Flk1, largely phenocopies Tel1/ETV6 depletion. Few such links between intrinsic and extrinsic programming of stem cells have been reported previously. Our data place Tel1/ETV6 at the apex of the genetic regulatory cascade leading to HSC production.
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Affiliation(s)
- Aldo Ciau-Uitz
- MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
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Abstract
PURPOSE OF REVIEW The role of bone morphogenetic proteins (BMPs) in vasculogenesis is still not well understood, despite many recent developments in this area of research. In this review, we discuss the most recent studies that identify new critical mechanisms through which BMP signaling acts with a focus on angiogenesis. RECENT FINDINGS New evidence brought to light over the last few years suggests that BMP-binding proteins, formerly thought of as antagonists, can also increase BMP activity under certain conditions. It has also recently been determined that components of the extracellular matrix are involved in the BMP signaling pathways that regulate angiogenesis. Through the BMP pathway, myosin-X and cyclooxygenase 2 serve as target genes that have been determined to play a role in blood vessel formation. BMPs also conduct Smad-independent signaling and crosstalk with other pathways. Finally, BMPs have been shown to play an antiangiogenic role in specific settings. SUMMARY Better understanding of the BMP signaling pathway and its regulators can have potentially great effects on therapeutic strategies from cardiovascular disease to cancer.
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Wilkinson RN, Pouget C, Gering M, Russell AJ, Davies SG, Kimelman D, Patient R. Hedgehog and Bmp polarize hematopoietic stem cell emergence in the zebrafish dorsal aorta. Dev Cell 2009; 16:909-16. [PMID: 19531361 DOI: 10.1016/j.devcel.2009.04.014] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 03/02/2009] [Accepted: 04/29/2009] [Indexed: 01/09/2023]
Abstract
Hematopoietic stem cells (HSCs) are first detected in the floor of the embryonic dorsal aorta (DA), and we investigate the signals that induce the HSC program there. We show that while continued Hedgehog (Hh) signaling from the overlying midline structures maintains the arterial program characteristic of the DA roof, a ventral Bmp4 signal induces the blood stem cell program in the DA floor. This patterning of the DA by Hh and Bmp is the mirror image of that in the neural tube, with Hh favoring dorsal rather than ventral cell types, and Bmp favoring ventral rather than dorsal. With the majority of current data supporting a model whereby HSCs derive from arterial endothelium, our data identify the signal driving this conversion. These findings are important for the study of the production of HSCs from embryonic stem cells and establish a paradigm for the development of adult stem cells.
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Affiliation(s)
- Robert N Wilkinson
- MRC Molecular Hematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
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Chen Y, Costa RMB, Love NR, Soto X, Roth M, Paredes R, Amaya E. C/EBPalpha initiates primitive myelopoiesis in pluripotent embryonic cells. Blood 2009; 114:40-8. [PMID: 19420355 PMCID: PMC3747498 DOI: 10.1182/blood-2008-11-189159] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The molecular mechanisms that underlie the development of primitive myeloid cells in vertebrate embryos are not well understood. Here we characterize the role of cebpa during primitive myeloid cell development in Xenopus. We show that cebpa is one of the first known hematopoietic genes expressed in the embryo. Loss- and gain-of-function studies show that it is both necessary and sufficient for the development of functional myeloid cells. In addition, we show that cebpa misexpression leads to the precocious induction of myeloid cell markers in pluripotent prospective ectodermal cells, without the cells transitioning through a general mesodermal state. Finally, we use live imaging to show that cebpa-expressing cells exhibit many attributes of terminally differentiated myeloid cells, such as highly active migratory behavior, the ability to quickly and efficiently migrate toward wounds and phagocytose bacteria, and the ability to enter the circulation. Thus, C/EPBalpha is the first known single factor capable of initiating an entire myelopoiesis pathway in pluripotent cells in the embryo.
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Affiliation(s)
- Yaoyao Chen
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Ricardo M. B. Costa
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Nick R. Love
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Ximena Soto
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Martin Roth
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Roberto Paredes
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Enrique Amaya
- The Healing Foundation Centre, Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
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