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Collart C, Ciccarelli A, Ivanovitch K, Rosewell I, Kumar S, Kelly G, Edwards A, Smith JC. The migratory pathways of the cells that form the endocardium, dorsal aortae, and head vasculature in the mouse embryo. BMC Dev Biol 2021; 21:8. [PMID: 33752600 PMCID: PMC7986287 DOI: 10.1186/s12861-021-00239-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 02/12/2021] [Indexed: 11/25/2022]
Abstract
Background Vasculogenesis in amniotes is often viewed as two spatially and temporally distinct processes, occurring in the yolk sac and in the embryo. However, the spatial origins of the cells that form the primary intra-embryonic vasculature remain uncertain. In particular, do they obtain their haemato-endothelial cell fate in situ, or do they migrate from elsewhere? Recently developed imaging techniques, together with new Tal1 and existing Flk1 reporter mouse lines, have allowed us to investigate this question directly, by visualising cell trajectories live and in three dimensions. Results We describe the pathways that cells follow to form the primary embryonic circulatory system in the mouse embryo. In particular, we show that Tal1-positive cells migrate from within the yolk sac, at its distal border, to contribute to the endocardium, dorsal aortae and head vasculature. Other Tal1 positive cells, similarly activated within the yolk sac, contribute to the yolk sac vasculature. Using single-cell transcriptomics and our imaging, we identify VEGF and Apela as potential chemo-attractants that may regulate the migration into the embryo. The dorsal aortae and head vasculature are known sites of secondary haematopoiesis; given the common origins that we observe, we investigate whether this is also the case for the endocardium. We discover cells budding from the wall of the endocardium with high Tal1 expression and diminished Flk1 expression, indicative of an endothelial to haematopoietic transition. Conclusions In contrast to the view that the yolk sac and embryonic circulatory systems form by two separate processes, our results indicate that Tal1-positive cells from the yolk sac contribute to both vascular systems. It may be that initial Tal1 activation in these cells is through a common mechanism. Supplementary Information The online version contains supplementary material available at 10.1186/s12861-021-00239-3.
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Affiliation(s)
- C Collart
- Developmental Biology Laboratory, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK.
| | - A Ciccarelli
- Advanced Light Microscopy Facility, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
| | - K Ivanovitch
- Developmental Biology Laboratory, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
| | - I Rosewell
- Genetic Modification Service, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
| | - S Kumar
- Advanced Light Microscopy Facility, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK.,Photonics Group, 606 Blackett Laboratory, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - G Kelly
- Bioinformatics and Biostatistics Facility, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
| | - A Edwards
- Advanced Sequencing Facility, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
| | - J C Smith
- Developmental Biology Laboratory, Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
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Collart C, Moro-Sibilot D, Maignan M, Schwebel C, Giaj Levra M, Ferrer L, Paquier C, Viglino D, Toffart AC. [Emergency room management of patients with lung cancer and organ failure]. Rev Mal Respir 2019; 36:672-678. [PMID: 31255316 DOI: 10.1016/j.rmr.2019.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 03/23/2019] [Indexed: 11/16/2022]
Abstract
BACKGROUND When patients with lung cancer present to the emergency department with organ failure the question of admission to intensive care has to be considered. Our aim is to describe the process leading to the proposed management. METHODS Retrospectively, all patients admitted to the emergency room between December 2010 and January 2015 with a diagnosis of ICD-10 C34.9 (lung cancer) were reviewed. Those with at least one organ failure were included. RESULTS The records of 561 patients were reviewed, 79 (14%) had at least one organ failure. The majority of these patients received maximal medical care (59%), 25% exclusive palliative care, and 15% intensive care. Performance status, metastatic status and efficacy of anti-tumor treatment were recorded in the emergency medical record in 20%, 66% and 74% of cases, respectively. An opinion was obtained from the oncologist in 44% of cases and from the intensivist in 41% of cases. No external advice was provided in 27% of cases. CONCLUSION In the majority of cases, the decision on the intensity of care to be provided to patients with lung cancer and organ failure was made in a collective manner.
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Affiliation(s)
- C Collart
- Service d'accueil des urgences, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - D Moro-Sibilot
- Pôle thorax et vaisseaux, clinique universitaire de pneumologie, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - M Maignan
- Service d'accueil des urgences, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France; Inserm U1042, laboratoire hypoxie physiopathologie, université Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - C Schwebel
- Clinique universitaire de médecine intensive et réanimation, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France; Inserm U1039, biocliniques radiopharmaceutiques, université Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - M Giaj Levra
- Pôle thorax et vaisseaux, clinique universitaire de pneumologie, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - L Ferrer
- Pôle thorax et vaisseaux, clinique universitaire de pneumologie, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - C Paquier
- Service d'accueil des urgences, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - D Viglino
- Service d'accueil des urgences, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France; Inserm U1042, laboratoire hypoxie physiopathologie, université Grenoble-Alpes, 38043 Grenoble cedex 9, France
| | - A-C Toffart
- Pôle thorax et vaisseaux, clinique universitaire de pneumologie, CHU de Grenoble-Alpes, 38043 Grenoble cedex 9, France; Inserm U 1209, CNRS UMR 5309, centre de recherche UGA, institut pour l'avancée des biosciences, 38700 La Tronche, France.
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Collart C, Maignan M, Sakhri L, Paquier C, Moro-Sibilot D, Carpentier F, Toffart A. Caractéristiques et orientation des patients atteints d’un cancer bronchique avec défaillance d’organe admis aux urgences du CHU de Grenoble. Rev Mal Respir 2016. [DOI: 10.1016/j.rmr.2015.10.675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Zwijsen A, van Grunsven LA, Bosman EA, Collart C, Nelles L, Umans L, Van de Putte T, Wuytens G, Huylebroeck D, Verschueren K. Transforming growth factor beta signalling in vitro and in vivo: activin ligand-receptor interaction, Smad5 in vasculogenesis, and repression of target genes by the deltaEF1/ZEB-related SIP1 in the vertebrate embryo. Mol Cell Endocrinol 2001; 180:13-24. [PMID: 11451567 DOI: 10.1016/s0303-7207(01)00505-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The identification and characterization of components of the transforming growth factor beta (TGFbeta) signalling pathway are proceeding at a very fast pace. To illustrate a number of our activities in this field, we first summarize our work aiming at the selection from a large collection of single residue substitution mutants of two activin A polypeptides in which D27 and K102, respectively, have been modified. This work has highlighted the importance of K102 and its positive charge for binding to activin type II receptors. Activin K102E, which did not bind to high-affinity receptor complexes, may be a valuable beta chain, when incorporated in recombinant inhibin to unambiguously detect novel inhibin binding sites at the cell surface. We then illustrate how Smad5 knockout mice and an overexpression approach with a truncated TGFbeta type II receptor in the mouse embryo can contribute to the identification of a novel TGFbeta-->TbetaRII/ALK1-->Smad5 pathway in endothelial cells in the embryo proper and the yolk sac vasculature. We conclude with a summary of our results with a Smad-interacting transcriptional repressor but focus on its biological significance in the vertebrate embryo.
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Affiliation(s)
- A Zwijsen
- Laboratory of Molecular Biology (Celgen), Department of Cell Growth, Differentiation and Development (VIB-07), Flanders Interuniversity Institute for Biotechnology (VIB), University of Leuven, Belgium
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Remacle JE, Kraft H, Lerchner W, Wuytens G, Collart C, Verschueren K, Smith JC, Huylebroeck D. New mode of DNA binding of multi-zinc finger transcription factors: deltaEF1 family members bind with two hands to two target sites. EMBO J 1999; 18:5073-84. [PMID: 10487759 PMCID: PMC1171578 DOI: 10.1093/emboj/18.18.5073] [Citation(s) in RCA: 219] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
SIP1, a Smad-interacting protein, and deltaEF1, a transcriptional repressor involved in skeletal and T-cell development, belong to the same family of DNA binding proteins. SIP1 and deltaEF1 contain two separated clusters of zinc fingers, one N-terminal and one C-terminal. These clusters show high sequence homology and are highly conserved between SIP1 and deltaEF1. Each zinc finger cluster binds independently to a 5'-CACCT sequence. However, high-affinity binding sites for full-length SIP1 and deltaEF1 in the promoter regions of candidate target genes like Xenopus Xbra2, and human alpha4-integrin and E-cadherin, are bipartite elements composed of one CACCT and one CACCTG sequence, the orientation and spacing of which can vary. Using transgenic Xenopus embryos, we demonstrate that the integrity of these two sequences is necessary for correct spatial expression of a Xbra2 promoter-driven reporter gene. Both zinc finger clusters must be intact for the high-affinity binding of SIP1 to DNA and for its optimal repressor activity. Our results show that SIP1 binds as monomer and contacts one target sequence with the first zinc finger cluster, and the other with the second cluster. Our work redefines the optimal binding site and, consequently, candidate target genes for vertebrate members of the deltaEF1 family.
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Affiliation(s)
- J E Remacle
- Department of Cell Growth, Flanders Interuniversity Institute for Biotechnology (VIB), Laboratory of Molecular Biology (CELGEN), University of Leuven, Herestraat 49, B-3000 Leuven, Belgium
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Verschueren K, Remacle JE, Collart C, Kraft H, Baker BS, Tylzanowski P, Nelles L, Wuytens G, Su MT, Bodmer R, Smith JC, Huylebroeck D. SIP1, a novel zinc finger/homeodomain repressor, interacts with Smad proteins and binds to 5'-CACCT sequences in candidate target genes. J Biol Chem 1999; 274:20489-98. [PMID: 10400677 DOI: 10.1074/jbc.274.29.20489] [Citation(s) in RCA: 381] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Activation of transforming growth factor beta receptors causes the phosphorylation and nuclear translocation of Smad proteins, which then participate in the regulation of expression of target genes. We describe a novel Smad-interacting protein, SIP1, which was identified using the yeast two-hybrid system. Although SIP1 interacts with the MH2 domain of receptor-regulated Smads in yeast and in vitro, its interaction with full-length Smads in mammalian cells requires receptor-mediated Smad activation. SIP1 is a new member of the deltaEF1/Zfh-1 family of two-handed zinc finger/homeodomain proteins. Like deltaEF1, SIP1 binds to 5'-CACCT sequences in different promoters, including the Xenopus brachyury promoter. Overexpression of either full-length SIP1 or its C-terminal zinc finger cluster, which bind to the Xbra2 promoter in vitro, prevented expression of the endogenous Xbra gene in early Xenopus embryos. Therefore, SIP1, like deltaEF1, is likely to be a transcriptional repressor, which may be involved in the regulation of at least one immediate response gene for activin-dependent signal transduction pathways. The identification of this Smad-interacting protein opens new routes to investigate the mechanisms by which transforming growth factor beta members exert their effects on expression of target genes in responsive cells and in the vertebrate embryo.
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Affiliation(s)
- K Verschueren
- Department of Cell Growth, Differentiation and Development (VIB-07), Flanders Interuniversity Institute for Biotechnology (VIB), Herestraat49, B-3000 Leuven, Belgium
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