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Huss DJ, Saias S, Hamamah S, Singh JM, Wang J, Dave M, Kim J, Eberwine J, Lansford R. Avian Primordial Germ Cells Contribute to and Interact With the Extracellular Matrix During Early Migration. Front Cell Dev Biol 2019; 7:35. [PMID: 30984757 PMCID: PMC6447691 DOI: 10.3389/fcell.2019.00035] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Accepted: 02/26/2019] [Indexed: 01/10/2023] Open
Abstract
During early avian development, primordial germ cells (PGC) are highly migratory, moving from the central area pellucida of the blastoderm to the anterior extra-embryonic germinal crescent. The PGCs soon move into the forming blood vessels by intravasation and travel in the circulatory system to the genital ridges where they participate in the organogenesis of the gonads. This complex cellular migration takes place in close association with a nascent extracellular matrix that matures in a precise spatio-temporal pattern. We first compiled a list of quail matrisome genes by bioinformatic screening of human matrisome orthologs. Next, we used single cell RNA-seq analysis (scRNAseq) to determine that PGCs express numerous ECM and ECM-associated genes in early embryos. The expression of select ECM transcripts and proteins in PGCs were verified by fluorescent in situ hybridization (FISH) and immunofluorescence (IF). Live imaging of transgenic quail embryos injected with fluorescent antibodies against fibronectin and laminin, showed that germinal crescent PGCs display rapid shape changes and morphological properties such as blebbing and filopodia while surrounded by, or in close contact with, an ECM fibril meshwork that is itself in constant motion. Injection of anti-β1 integrin CSAT antibodies resulted in a reduction of mature fibronectin and laminin fibril meshwork in the germinal crescent at HH4-5 but did not alter the active motility of the PGCs or their ability to populate the germinal crescent. These results suggest that integrin β1 receptors are important, but not required, for PGCs to successfully migrate during embryonic development, but instead play a vital role in ECM fibrillogenesis and assembly.
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Affiliation(s)
- David J. Huss
- Department of Radiology, Children's Hospital Los Angeles, Los Angeles, CA, United States
- Translational Imaging Center, University of Southern California, Los Angeles, CA, United States
| | - Sasha Saias
- Department of Radiology, Children's Hospital Los Angeles, Los Angeles, CA, United States
| | - Sevag Hamamah
- Department of Radiology, Children's Hospital Los Angeles, Los Angeles, CA, United States
| | - Jennifer M. Singh
- Department of Pharmacology, University of Pennsylvania, Philadelphia, PA, United States
- Penn Genome Frontiers Institute, University of Pennsylvania, Philadelphia, PA, United States
| | - Jinhui Wang
- Department of Pharmacology, University of Pennsylvania, Philadelphia, PA, United States
- Penn Genome Frontiers Institute, University of Pennsylvania, Philadelphia, PA, United States
| | - Mohit Dave
- Department of Radiology, Children's Hospital Los Angeles, Los Angeles, CA, United States
| | - Junhyong Kim
- Penn Genome Frontiers Institute, University of Pennsylvania, Philadelphia, PA, United States
- Department of Biology, University of Pennsylvania, Philadelphia, PA, United States
| | - James Eberwine
- Department of Pharmacology, University of Pennsylvania, Philadelphia, PA, United States
- Penn Genome Frontiers Institute, University of Pennsylvania, Philadelphia, PA, United States
| | - Rusty Lansford
- Department of Radiology, Children's Hospital Los Angeles, Los Angeles, CA, United States
- Translational Imaging Center, University of Southern California, Los Angeles, CA, United States
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Pereda J, Zorn T, Soto-Suazo M. Migration of human and mouse primordial germ cells and colonization of the developing ovary: An ultrastructural and cytochemical study. Microsc Res Tech 2006; 69:386-95. [PMID: 16718662 DOI: 10.1002/jemt.20298] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This review is an account of the origin and migratory events of primordial germ cells until their settlement in the gonad before sexual differentiation in the human as well as mice. In this context, the morphodynamic characteristics of the migration of the primordial germ cells, the macromolecular characteristics of the extracellular matrix of the migratory pathway, and the factors involved in the germ cell guidance have been analyzed and discussed in the light of recent advances in this field, by means of immunocytochemical procedures. The events prior to gonadal morphogenesis and the origin of the somatic cell content of the human gonadal primordium have been also analyzed. In particular, evidences are presented showing that cells derived from the coelomic epithelium and mesenchyme are at the origin of the somatic components of the gonadal primordium, and that a mesonephric cell contribution to the generation of somatic cell components of the genital ridge in humans should be discarded due to the morphological stability of the different nephric structures during the period preceding the sexual differentiation of the gonad.
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Affiliation(s)
- Jaime Pereda
- Faculty of Medical Sciences, University of Santiago of Chile, Chile.
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Nahirney PC, Mikawa T, Fischman DA. Evidence for an extracellular matrix bridge guiding proepicardial cell migration to the myocardium of chick embryos. Dev Dyn 2003; 227:511-23. [PMID: 12889060 DOI: 10.1002/dvdy.10335] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
During heart development, the proepicardium (PE) gives rise to cells of the epicardial epithelium, connective tissue of the subepicardium and the myocardium, and smooth muscle, endothelium, and connective tissue of the coronary arteries. The PE arises as an outgrowth of the pericardial serosa at embryonic day 2 (Hamburger and Hamilton stage [HH] 14) of chick development. Between stages HH14 and HH17, multicellular villous projections extend from the PE toward the dorsal aspect of the lesser curvature of the myocardium. On reaching the atrioventricular (AV) junction, the cells spread over the myocardium, eventually enveloping the complete heart surface as a simple squamous epithelium. Although the lineage of the PE cells is well established, it remains uncertain how cells of the PE reach the myocardial surface and specifically target the AV junction. By using a combination of serial section reconstructions, immunofluorescence, and electron microscopy, we have identified an extracellular matrix bridge (ECMB) spanning the coelomic cavity between the PE and the myocardium. The ECMB is first detectable at HH14 and persists until the PE contacts the bare myocardial surface. This ECMB stains intensely with ruthenium red and Alcian blue, contains heparan sulfate and fibronectin, and exhibits both fibrillar and globular ultrastructure, reminiscent of proteoglycans. After PE attachment to the myocardium (HH16-HH17), the subepicardium exhibited strong staining for heparan sulfate. Heparinase injection into the pericardial coelom at HH15 resulted in aberrant development of the primordial epicardium. On the basis of these studies, we suggest that the ECMB may participate in migration and targeting of the PE to the myocardium.
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Affiliation(s)
- Patrick C Nahirney
- Department of Cell and Developmental Biology, Weill Medical College of Cornell University, New York, New York 10021, USA
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