1
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Fetsko AR, Sebo DJ, Budzynski LB, Scharbarth A, Taylor MR. IL-1β disrupts the initiation of blood-brain barrier development by inhibiting endothelial Wnt/β-catenin signaling. iScience 2024; 27:109651. [PMID: 38638574 PMCID: PMC11025013 DOI: 10.1016/j.isci.2024.109651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 02/06/2024] [Accepted: 03/29/2024] [Indexed: 04/20/2024] Open
Abstract
During neuroinflammation, the proinflammatory cytokine interleukin-1β (IL-1β) impacts blood-brain barrier (BBB) function by disrupting brain endothelial tight junctions, promoting vascular permeability, and increasing transmigration of immune cells. Here, we examined the effects of Il-1β on the in vivo initiation of BBB development. We generated doxycycline-inducible transgenic zebrafish to secrete Il-1β in the CNS. To validate the utility of our model, we showed Il-1β dose-dependent mortality, recruitment of neutrophils, and expansion of microglia. Using live imaging, we discovered that Il-1β causes a significant reduction in CNS angiogenesis and barriergenesis. To demonstrate specificity, we rescued the Il-1β induced phenotypes by targeting the zebrafish il1r1 gene using CRISPR-Cas9. Mechanistically, we determined that Il-1β disrupts the initiation of BBB development by decreasing Wnt/β-catenin transcriptional activation in brain endothelial cells. Given that several neurodevelopmental disorders are associated with inflammation, our findings support further investigation into the connections between proinflammatory cytokines, neuroinflammation, and neurovascular development.
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Affiliation(s)
- Audrey R. Fetsko
- School of Pharmacy, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Dylan J. Sebo
- School of Pharmacy, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Lilyana B. Budzynski
- School of Pharmacy, Pharmacology and Toxicology Program, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Alli Scharbarth
- School of Pharmacy, Pharmacology and Toxicology Program, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Michael R. Taylor
- School of Pharmacy, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI 53705, USA
- School of Pharmacy, Pharmacology and Toxicology Program, University of Wisconsin-Madison, Madison, WI 53705, USA
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2
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Fetsko AR, Sebo DJ, Budzynski LB, Scharbarth A, Taylor MR. IL-1β disrupts blood-brain barrier development by inhibiting endothelial Wnt/β-catenin signaling. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.12.04.569943. [PMID: 38106202 PMCID: PMC10723338 DOI: 10.1101/2023.12.04.569943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
During neuroinflammation, the proinflammatory cytokine Interleukin-1β (IL-1β) impacts blood-brain barrier (BBB) function by disrupting brain endothelial tight junctions, promoting vascular permeability, and increasing transmigration of immune cells. Here, we examined the effects of Il-1β on the in vivo development of the BBB. We generated a doxycycline-inducible transgenic zebrafish model that drives secretion of Il-1β in the CNS. To validate the utility of our model, we showed Il-1β dose-dependent mortality, recruitment of neutrophils, and expansion of microglia. Using live imaging, we discovered that Il-1β causes a significant reduction in CNS angiogenesis and barriergenesis. To demonstrate specificity, we rescued the Il-1β induced phenotypes by targeting the zebrafish il1r1 gene using CRISPR/Cas9. Mechanistically, we determined that Il-1β disrupts BBB development by decreasing Wnt/β-catenin transcriptional activation in brain endothelial cells. Given that several neurodevelopmental disorders are associated with inflammation, our findings support further investigation into the connections between proinflammatory cytokines, neuroinflammation, and neurovascular development.
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Affiliation(s)
- Audrey R. Fetsko
- School of Pharmacy, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Dylan J. Sebo
- School of Pharmacy, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Lilyana B. Budzynski
- School of Pharmacy, Pharmacology and Toxicology Program, University of Wisconsin-Madison, Madison, WI, USA
| | - Alli Scharbarth
- School of Pharmacy, Pharmacology and Toxicology Program, University of Wisconsin-Madison, Madison, WI, USA
| | - Michael R. Taylor
- School of Pharmacy, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI, USA
- School of Pharmacy, Pharmacology and Toxicology Program, University of Wisconsin-Madison, Madison, WI, USA
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3
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Zhang L, Abedin M, Jo HN, Levey J, Dinh QC, Chen Z, Angers S, Junge HJ. A Frizzled4-LRP5 agonist promotes blood-retina barrier function by inducing a Norrin-like transcriptional response. iScience 2023; 26:107415. [PMID: 37559903 PMCID: PMC10407957 DOI: 10.1016/j.isci.2023.107415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 05/22/2023] [Accepted: 07/14/2023] [Indexed: 08/11/2023] Open
Abstract
Norrin (NDP) and WNT7A/B induce and maintain the blood-brain and blood-retina barrier (BBB, BRB) by stimulating the Frizzled4-LDL receptor related protein 5/6 (FZD4-LRP5/6) complex to induce beta-catenin-dependent signaling in endothelial cells (ECs). Recently developed agonists for the FZD4-LRP5 complex have therapeutic potential in retinal and neurological diseases. Here, we use the tetravalent antibody modality F4L5.13 to identify agonist activities in Tspan12-/- mice, which display a complex retinal pathology due to impaired NDP-signaling. F4L5.13 administration during development alleviates BRB defects, retinal hypovascularization, and restores neural function. In mature Tspan12-/- mice F4L5.13 partially induces a BRB de novo without inducing angiogenesis. In a genetic model of impaired BRB maintenance, administration of F4L5.13 rapidly and substantially restores the BRB. scRNA-seq reveals perturbations of key mediators of barrier functions in juvenile Tspan12-/- mice, which are in large parts restored after F4L5.13 administration. This study identifies transcriptional and functional activities of FZD4-LRP5 agonists.
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Affiliation(s)
- Lingling Zhang
- Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
| | - Md. Abedin
- Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
| | - Ha-Neul Jo
- Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
- Graduate Program in Molecular, Cellular, Developmental Biology and Genetics, University of Minnesota, Minneapolis, MN, USA
| | - Jacklyn Levey
- Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
- Graduate Program in Molecular, Cellular, Developmental Biology and Genetics, University of Minnesota, Minneapolis, MN, USA
| | - Quynh Chau Dinh
- Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
| | - Zhe Chen
- Department of Neuroscience, University of Minnesota, Minneapolis, MN, USA
| | - Stephane Angers
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, ON, Canada
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, Canada
| | - Harald J. Junge
- Department of Ophthalmology and Visual Neurosciences, University of Minnesota, Minneapolis, MN, USA
- Graduate Program in Molecular, Cellular, Developmental Biology and Genetics, University of Minnesota, Minneapolis, MN, USA
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4
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Ben-Zvi A, Liebner S. Developmental regulation of barrier- and non-barrier blood vessels in the CNS. J Intern Med 2022; 292:31-46. [PMID: 33665890 DOI: 10.1111/joim.13263] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 02/01/2021] [Indexed: 12/22/2022]
Abstract
The blood-brain barrier (BBB) is essential for creating and maintaining tissue homeostasis in the central nervous system (CNS), which is key for proper neuronal function. In most vertebrates, the BBB is localized to microvascular endothelial cells that acquire barrier properties during angiogenesis of the neuroectoderm. Complex and continuous tight junctions, and the lack of fenestrae combined with low pinocytotic activity render the BBB endothelium a tight barrier for water-soluble molecules that may only enter the CNS via specific transporters. The differentiation of these unique endothelial properties during embryonic development is initiated by endothelial-specific flavours of the Wnt/β-catenin pathway in a precise spatiotemporal manner. In this review, we summarize the currently known cellular (neural precursor and endothelial cells) and molecular (VEGF and Wnt/β-catenin) mechanisms mediating brain angiogenesis and barrier formation. Moreover, we introduce more recently discovered crosstalk with cellular and acellular elements within the developing CNS such as the extracellular matrix. We discuss recent insights into the downstream molecular mechanisms of Wnt/β-catenin in particular, the recently identified target genes like Foxf2, Foxl2, Foxq1, Lef1, Ppard, Zfp551, Zic3, Sox17, Apcdd1 and Fgfbp1 that are involved in refining and maintaining barrier characteristics in the mature BBB endothelium. Additionally, we elute to recent insight into barrier heterogeneity and differential endothelial barrier properties within the CNS, focussing on the circumventricular organs as well as on the neurogenic niches in the subventricular zone and the hippocampus. Finally, open questions and future BBB research directions are highlighted in the context of taking benefit from understanding BBB development for strategies to modulate BBB function under pathological conditions.
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Affiliation(s)
- A Ben-Zvi
- From the, The Department of Developmental Biology and Cancer Research, Institute for Medical Research IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - S Liebner
- Institute of Neurology (Edinger Institute), University Hospital, Goethe University Frankfurt, Frankfurt am Main, Germany.,Excellence Cluster Cardio-Pulmonary Systems (ECCPS), Partner Site Frankfurt, Frankfurt am Main, Germany.,German Center for Cardiovascular Research (DZHK), Partner Site Rhine-Main, Frankfurt am Main, Germany
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5
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Matsuoka RL, Buck LD, Vajrala KP, Quick RE, Card OA. Historical and current perspectives on blood endothelial cell heterogeneity in the brain. Cell Mol Life Sci 2022; 79:372. [PMID: 35726097 PMCID: PMC9209386 DOI: 10.1007/s00018-022-04403-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/18/2022] [Accepted: 05/25/2022] [Indexed: 11/28/2022]
Abstract
Dynamic brain activity requires timely communications between the brain parenchyma and circulating blood. Brain-blood communication is facilitated by intricate networks of brain vasculature, which display striking heterogeneity in structure and function. This vascular cell heterogeneity in the brain is fundamental to mediating diverse brain functions and has long been recognized. However, the molecular basis of this biological phenomenon has only recently begun to be elucidated. Over the past century, various animal species and in vitro systems have contributed to the accumulation of our fundamental and phylogenetic knowledge about brain vasculature, collectively advancing this research field. Historically, dye tracer and microscopic observations have provided valuable insights into the anatomical and functional properties of vasculature across the brain, and these techniques remain an important approach. Additionally, recent advances in molecular genetics and omics technologies have revealed significant molecular heterogeneity within brain endothelial and perivascular cell types. The combination of these conventional and modern approaches has enabled us to identify phenotypic differences between healthy and abnormal conditions at the single-cell level. Accordingly, our understanding of brain vascular cell states during physiological, pathological, and aging processes has rapidly expanded. In this review, we summarize major historical advances and current knowledge on blood endothelial cell heterogeneity in the brain, and discuss important unsolved questions in the field.
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Affiliation(s)
- Ryota L Matsuoka
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA. .,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA.
| | - Luke D Buck
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA
| | - Keerti P Vajrala
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA.,Kansas City University College of Osteopathic Medicine, Kansas City, MO 64106, USA
| | - Rachael E Quick
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA
| | - Olivia A Card
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.,Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, 44195, USA
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6
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Molecular and Cellular Mechanisms of Vascular Development in Zebrafish. Life (Basel) 2021; 11:life11101088. [PMID: 34685459 PMCID: PMC8539546 DOI: 10.3390/life11101088] [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: 09/10/2021] [Revised: 10/11/2021] [Accepted: 10/13/2021] [Indexed: 12/13/2022] Open
Abstract
The establishment of a functional cardiovascular system is crucial for the development of all vertebrates. Defects in the development of the cardiovascular system lead to cardiovascular diseases, which are among the top 10 causes of death worldwide. However, we are just beginning to understand which signaling pathways guide blood vessel growth in different tissues and organs. The advantages of the model organism zebrafish (Danio rerio) helped to identify novel cellular and molecular mechanisms of vascular growth. In this review we will discuss the current knowledge of vasculogenesis and angiogenesis in the zebrafish embryo. In particular, we describe the molecular mechanisms that contribute to the formation of blood vessels in different vascular beds within the embryo.
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7
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Yin J, Heutschi D, Belting HG, Affolter M. Building the complex architectures of vascular networks: Where to branch, where to connect and where to remodel? Curr Top Dev Biol 2021; 143:281-297. [PMID: 33820624 DOI: 10.1016/bs.ctdb.2021.01.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The cardiovascular system is the first organ to become functional during vertebrate embryogenesis and is responsible for the distribution of oxygen and nutrients to all cells of the body. The cardiovascular system constitutes a circulatory loop in which blood flows from the heart through arteries into the microvasculature and back through veins to the heart. The vasculature is characterized by the heterogeneity of blood vessels with respect to size, cellular architecture and function, including both larger vessels that are found at defined positions within the body and smaller vessels or vascular beds that are organized in a less stereotyped manner. Recent studies have shed light on how the vascular tree is formed and how the interconnection of all branches is elaborated and maintained. In contrast to many other branched organs such as the lung or the kidney, vessel connection (also called anastomosis) is a key process underlying the formation of vascular networks; each outgrowing angiogenic sprout must anastomose in order to allow blood flow in the newly formed vessel segment. It turns out that during this "sprouting and anastomosis" process, too many vessels are generated, and that blood flow is subsequently optimized through the removal (pruning) of low flow segments. Here, we reflect on the cellular and molecular mechanisms involved in forming the complex architecture of the vasculature through sprouting, anastomosis and pruning, and raise some questions that remain to be addressed in future studies.
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Affiliation(s)
- Jianmin Yin
- Biozentrum der Universität Basel, Basel, Switzerland
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8
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Trombetta-Lima M, Assis-Ribas T, Cintra RC, Campeiro JD, Guerreiro JR, Winnischofer SMB, Nascimento ICC, Ulrich H, Hayashi MAF, Sogayar MC. Impact of Reck expression and promoter activity in neuronal in vitro differentiation. Mol Biol Rep 2021; 48:1985-1994. [PMID: 33619662 DOI: 10.1007/s11033-021-06175-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 01/20/2021] [Indexed: 02/07/2023]
Abstract
Reck (REversion-inducing Cysteine-rich protein with Kazal motifs) tumor suppressor gene encodes a multifunctional glycoprotein which inhibits the activity of several matrix metalloproteinases (MMPs), and has the ability to modulate the Notch and canonical Wnt pathways. Reck-deficient neuro-progenitor cells undergo precocious differentiation; however, modulation of Reck expression during progression of the neuronal differentiation process is yet to be characterized. In the present study, we demonstrate that Reck expression levels are increased during in vitro neuronal differentiation of PC12 pheochromocytoma cells and P19 murine teratocarcinoma cells and characterize mouse Reck promoter activity during this process. Increased Reck promoter activity was found upon induction of differentiation in PC12 cells, in accordance with its increased mRNA expression levels in mouse in vitro models. Interestingly, Reck overexpression, prior to the beginning of the differentiation protocol, led to diminished efficiency of the neuronal differentiation process. Taken together, our findings suggest that increased Reck expression at early stages of differentiation diminishes the number of neuron-like cells, which are positive for the beta-3 tubulin marker. Our data highlight the importance of Reck expression evaluation to optimize in vitro neuronal differentiation protocols.
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Affiliation(s)
- Marina Trombetta-Lima
- Núcleo de Terapia Celular e Molecular (NUCEL), Faculdade de Medicina, Universidade de São Paulo (USP), Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil
| | - Thais Assis-Ribas
- Núcleo de Terapia Celular e Molecular (NUCEL), Faculdade de Medicina, Universidade de São Paulo (USP), Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil
| | - Ricardo C Cintra
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (USP), São Paulo, SP, 05508-000, Brazil
| | - Joana D Campeiro
- Departamento de Farmacologia, Escola Paulista de Medicina (EPM), Universidade Federal de São Paulo (UNIFESP), Rua 3 de Maio 100, Ed INFAR, 3º andar, São Paulo, SP, 04044-020, Brazil
| | - Juliano R Guerreiro
- Faculdade de Farmácia, Universidade Paulista (UNIP), São Paulo, SP, 05347-020, Brazil
| | - Sheila M B Winnischofer
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná (UFPR), Curitiba, PR, 81531-990, Brazil
- Departamento de Biologia Celular, Universidade Federal do Paraná (UFPR), Curitiba, PR, 81531-990, Brazil
| | - Isis C C Nascimento
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (USP), São Paulo, SP, 05508-000, Brazil
| | - Henning Ulrich
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (USP), São Paulo, SP, 05508-000, Brazil
| | - Mirian A F Hayashi
- Departamento de Farmacologia, Escola Paulista de Medicina (EPM), Universidade Federal de São Paulo (UNIFESP), Rua 3 de Maio 100, Ed INFAR, 3º andar, São Paulo, SP, 04044-020, Brazil.
| | - Mari C Sogayar
- Núcleo de Terapia Celular e Molecular (NUCEL), Faculdade de Medicina, Universidade de São Paulo (USP), Rua Pangaré, 100 (Cidade Universitária), São Paulo, SP, 05360-130, Brazil.
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (USP), São Paulo, SP, 05508-000, Brazil.
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9
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Sonavane PR, Willert K. Controlling Wnt Signaling Specificity and Implications for Targeting WNTs Pharmacologically. Handb Exp Pharmacol 2021; 269:3-28. [PMID: 34463853 DOI: 10.1007/164_2021_529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Wnt signaling is critical for proper development of the embryo and for tissue homeostasis in the adult. Activation of this signaling cascade is initiated by binding of the secreted Wnts to their receptors. With the mammalian genome encoding multiple Wnts and Wnt receptors, a longstanding question in the field has been how Wnt-receptor specificities are achieved. Emerging from these studies is a picture of exquisite control over Wnt protein production, secretion, distribution, and receptor interactions, culminating in activation of downstream signaling cascades that control a myriad of biological processes. Here we discuss mechanisms by which Wnt protein activities are tuned and illustrate how the multiple layers of regulation can be leveraged for therapeutic interventions in disease.
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Affiliation(s)
- Pooja R Sonavane
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA, USA
| | - Karl Willert
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA, USA.
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10
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Vieira JR, Shah B, Ruiz de Almodovar C. Cellular and Molecular Mechanisms of Spinal Cord Vascularization. Front Physiol 2020; 11:599897. [PMID: 33424624 PMCID: PMC7793711 DOI: 10.3389/fphys.2020.599897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 11/24/2020] [Indexed: 01/13/2023] Open
Abstract
During embryonic central nervous system (CNS) development, the neural and the vascular systems communicate with each other in order to give rise to a fully functional and mature CNS. The initial avascular CNS becomes vascularized by blood vessel sprouting from different vascular plexus in a highly stereotypical and controlled manner. This process is similar across different regions of the CNS. In particular for the developing spinal cord (SC), blood vessel ingression occurs from a perineural vascular plexus during embryonic development. In this review, we provide an updated and comprehensive description of the cellular and molecular mechanisms behind this stereotypical and controlled patterning of blood vessels in the developing embryonic SC, identified using different animal models. We discuss how signals derived from neural progenitors and differentiated neurons guide the SC growing vasculature. Lastly, we provide a perspective of how the molecular mechanisms identified during development could be used to better understand pathological situations.
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Affiliation(s)
- Jose Ricardo Vieira
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, Mannheim, Germany.,Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Bhavin Shah
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Carmen Ruiz de Almodovar
- European Center for Angioscience, Medicine Faculty Mannheim, Heidelberg University, Mannheim, Germany.,Interdisciplinary Center for Neurosciences, Heidelberg University, Heidelberg, Germany
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11
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Abstract
Five small protein domains, the CC-domains, at the N terminus of the RECK protein, play essential roles in signaling by WNT7A and WNT7B in the context of central nervous system angiogenesis and blood-brain barrier formation and maintenance. We have determined the structure of CC domain 4 (CC4) at 1.65-Å resolution and find that it folds into a compact four-helix bundle with three disulfide bonds. The CC4 structure, together with homology modeling of CC1, reveals the surface locations of critical residues that were shown in previous mutagenesis studies to mediate GPR124 binding and WNT7A/WNT7B recognition and signaling. Surprisingly, sequence and structural homology searches reveal no other cell-surface or secreted domains in vertebrates that resemble the CC domain, a pattern that is in striking contrast to other ancient and similarly sized domains, such as Epidermal Growth Factor, Fibronectin Type 3, Immunoglobulin, and Thrombospondin type 1 domains, which are collectively present in hundreds of proteins.
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12
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Ogawa S, Matsuzaki T, Noda M. Abundant expression of the membrane-anchored protease-regulator RECK in the anterior pituitary gland and its implication in the growth hormone/insulin-like growth factor 1 axis in mice. Mol Cell Endocrinol 2020; 508:110790. [PMID: 32165171 DOI: 10.1016/j.mce.2020.110790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 03/04/2020] [Accepted: 03/08/2020] [Indexed: 10/24/2022]
Abstract
The tumor suppressor gene Reversion-inducing cysteine-rich protein with Kazal motifs (Reck) encodes a membrane-anchored protease regulator expressed in multiple tissues in mouse embryos and is essential for embryonic development. In postnatal mice, however, physiological roles for the RECK protein remain unclear. We found in this study that Reck is abundantly expressed in growth hormone (GH)-producing cells (somatotrophs) in the anterior pituitary gland (AP). We also found that two types of viable Reck mutant mice, one with reduced RECK expression (Hypo mice) and the other with induced Reck deficiency from 10 days after birth (iKO mice treated with tamoxifen), exhibit common phenotypes including decreases in body size and plasma levels of insulin-like growth factor-1 (IGF1). To gain insights into the function of RECK in the AP, we characterized several somatotroph-associated molecules in the AP of these mice. Immunoreactivity of GH was greatly reduced in tamoxifen-treated iKO mice; in these mice, two membrane receptors involved in the stimulation of GH secretion [growth hormone secretagogue receptor (GHSR) and growth hormone releasing hormone receptor (GHRHR)] were decreased, however, their mRNAs were increased. Decrease in GHSR immunoreactivity and concomitant increase in its mRNA were also found in the other mutant line, Hypo. Furthermore, reduced immunoreactivity of growth hormone receptor (GHR) and concomitant increase in its mRNA was also found in the liver of Hypo mice. These results raise the possibility that RECK supports proper functioning of the GH/IGF1 axis in mice, thereby affecting their growth and metabolism.
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Affiliation(s)
- Shuichiro Ogawa
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Tomoko Matsuzaki
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Makoto Noda
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan.
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13
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Díaz-Coránguez M, Lin CM, Liebner S, Antonetti DA. Norrin restores blood-retinal barrier properties after vascular endothelial growth factor-induced permeability. J Biol Chem 2020; 295:4647-4660. [PMID: 32086377 DOI: 10.1074/jbc.ra119.011273] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 02/11/2020] [Indexed: 12/25/2022] Open
Abstract
Vascular endothelial growth factor (VEGF) contributes to blood-retinal barrier (BRB) dysfunction in several blinding eye diseases, including diabetic retinopathy. Signaling via the secreted protein norrin through the frizzled class receptor 4 (FZD4)/LDL receptor-related protein 5-6 (LRP5-6)/tetraspanin 12 (TSPAN12) receptor complex is required for developmental vascularization and BRB formation. Here, we tested the hypothesis that norrin restores BRB properties after VEGF-induced vascular permeability in diabetic rats or in animals intravitreally injected with cytokines. Intravitreal co-injection of norrin with VEGF completely ablated VEGF-induced BRB permeability to Evans Blue-albumin. Likewise, 5-month diabetic rats exhibited increased permeability of FITC-albumin, and a single norrin injection restored BRB properties. These results were corroborated in vitro, where co-stimulation of norrin with VEGF or stimulation of norrin after VEGF exposure restored barrier properties, indicated by electrical resistance or 70-kDa RITC-dextran permeability in primary endothelial cell culture. Interestingly, VEGF promoted norrin signaling by increasing the FZD4 co-receptor TSPAN12 at cell membranes in an MAPK/ERK kinase (MEK)/ERK-dependent manner. Norrin signaling through β-catenin was required for BRB restoration, but glycogen synthase kinase 3 α/β (GSK-3α/β) inhibition did not restore BRB properties. Moreover, levels of the tight junction protein claudin-5 were increased with norrin and VEGF or with VEGF alone, but both norrin and VEGF were required for enriched claudin-5 localization at the tight junction. These results suggest that VEGF simultaneously induces vascular permeability and promotes responsiveness to norrin. Norrin, in turn, restores tight junction complex organization and BRB properties in a β-catenin-dependent manner.
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Affiliation(s)
- Mónica Díaz-Coránguez
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan 48105
| | - Cheng-Mao Lin
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan 48105
| | - Stefan Liebner
- Institute of Neurology (Edinger Institute), University Hospital, Goethe University, 60538 Frankfurt, Germany
| | - David A Antonetti
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan 48105
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14
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Martowicz A, Trusohamn M, Jensen N, Wisniewska-Kruk J, Corada M, Ning FC, Kele J, Dejana E, Nyqvist D. Endothelial β-Catenin Signaling Supports Postnatal Brain and Retinal Angiogenesis by Promoting Sprouting, Tip Cell Formation, and VEGFR (Vascular Endothelial Growth Factor Receptor) 2 Expression. Arterioscler Thromb Vasc Biol 2019; 39:2273-2288. [PMID: 31533473 DOI: 10.1161/atvbaha.119.312749] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Activation of endothelial β-catenin signaling by neural cell-derived Norrin or Wnt ligands is vital for the vascularization of the retina and brain. Mutations in members of the Norrin/β-catenin pathway contribute to inherited blinding disorders because of defective vascular development and dysfunctional blood-retina barrier. Despite a vital role for endothelial β-catenin signaling in central nervous system health and disease, its contribution to central nervous system angiogenesis and its interactions with downstream signaling cascades remains incompletely understood. Approach and Results: Here, using genetically modified mouse models, we show that impaired endothelial β-catenin signaling caused hypovascularization of the postnatal retina and brain because of deficient endothelial cell proliferation and sprouting. Mosaic genetic analysis demonstrated that endothelial β-catenin promotes but is not required for tip cell formation. In addition, pharmacological treatment revealed that angiogenesis under conditions of inhibited Notch signaling depends upon endothelial β-catenin. Importantly, impaired endothelial β-catenin signaling abrogated the expression of the VEGFR (vascular endothelial growth factor receptor)-2 and VEGFR3 in brain microvessels but not in the lung endothelium. CONCLUSIONS Our study identifies molecular crosstalk between the Wnt/β-catenin and the Notch and VEGF-A signaling pathways and strongly suggest that endothelial β-catenin signaling supports central nervous system angiogenesis by promoting endothelial cell sprouting, tip cell formation, and VEGF-A/VEGFR2 signaling.
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Affiliation(s)
- Agnieszka Martowicz
- From the Division of Vascular Biology, Department of Medical Biochemistry and Biophysics (A.M., M.T., N.J., J.W.-K., F.C.N., D.N.), Karolinska Institutet, Stockholm, Sweden
| | - Marta Trusohamn
- From the Division of Vascular Biology, Department of Medical Biochemistry and Biophysics (A.M., M.T., N.J., J.W.-K., F.C.N., D.N.), Karolinska Institutet, Stockholm, Sweden
| | - Nina Jensen
- From the Division of Vascular Biology, Department of Medical Biochemistry and Biophysics (A.M., M.T., N.J., J.W.-K., F.C.N., D.N.), Karolinska Institutet, Stockholm, Sweden
| | - Joanna Wisniewska-Kruk
- From the Division of Vascular Biology, Department of Medical Biochemistry and Biophysics (A.M., M.T., N.J., J.W.-K., F.C.N., D.N.), Karolinska Institutet, Stockholm, Sweden
| | - Monica Corada
- IFOM-The FIRC Institute of Molecular Oncology, Milan, Italy (M.C., E.D.)
| | - Frank Chenfei Ning
- From the Division of Vascular Biology, Department of Medical Biochemistry and Biophysics (A.M., M.T., N.J., J.W.-K., F.C.N., D.N.), Karolinska Institutet, Stockholm, Sweden
| | - Julianna Kele
- Department of Pharmacology and Physiology (J.K.), Karolinska Institutet, Stockholm, Sweden
| | - Elisabetta Dejana
- IFOM-The FIRC Institute of Molecular Oncology, Milan, Italy (M.C., E.D.).,Department of Immunology, Genetics and Pathology, University of Uppsala, Sweden (E.D.)
| | - Daniel Nyqvist
- From the Division of Vascular Biology, Department of Medical Biochemistry and Biophysics (A.M., M.T., N.J., J.W.-K., F.C.N., D.N.), Karolinska Institutet, Stockholm, Sweden
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15
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O'Brown NM, Megason SG, Gu C. Suppression of transcytosis regulates zebrafish blood-brain barrier function. eLife 2019; 8:e47326. [PMID: 31429822 PMCID: PMC6726461 DOI: 10.7554/elife.47326] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 08/19/2019] [Indexed: 12/15/2022] Open
Abstract
As an optically transparent model organism with an endothelial blood-brain barrier (BBB), zebrafish offer a powerful tool to study the vertebrate BBB. However, the precise developmental profile of functional zebrafish BBB acquisition and the subcellular and molecular mechanisms governing the zebrafish BBB remain poorly characterized. Here, we capture the dynamics of developmental BBB leakage using live imaging, revealing a combination of steady accumulation in the parenchyma and sporadic bursts of tracer leakage. Electron microscopy studies further reveal high levels of transcytosis in brain endothelium early in development that are suppressed later. The timing of this suppression of transcytosis coincides with the establishment of BBB function. Finally, we demonstrate a key mammalian BBB regulator Mfsd2a, which inhibits transcytosis, plays a conserved role in zebrafish, as mfsd2aa mutants display increased BBB permeability due to increased transcytosis. Our findings indicate a conserved developmental program of barrier acquisition between zebrafish and mice.
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Affiliation(s)
| | - Sean G Megason
- Department of Systems BiologyHarvard Medical SchoolBostonUnited States
| | - Chenghua Gu
- Department of NeurobiologyHarvard Medical SchoolBostonUnited States
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16
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Li H, Miki T, Almeida GMD, Hanashima C, Matsuzaki T, Kuo CJ, Watanabe N, Noda M. RECK in Neural Precursor Cells Plays a Critical Role in Mouse Forebrain Angiogenesis. iScience 2019; 19:559-571. [PMID: 31445376 PMCID: PMC6713797 DOI: 10.1016/j.isci.2019.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/28/2019] [Accepted: 08/05/2019] [Indexed: 01/10/2023] Open
Abstract
RECK in neural precursor cells (NPCs) was previously found to support Notch-dependent neurogenesis in mice. On the other hand, recent studies implicate RECK in endothelial cells (ECs) in WNT7-triggered canonical WNT signaling essential for brain angiogenesis. Here we report that RECK in NPCs is also critical for brain angiogenesis. When Reck is inactivated in Foxg1-positive NPCs, mice die shortly after birth with hemorrhage in the forebrain, with angiogenic sprouts stalling at the periphery and forming abnormal aggregates reminiscent of those in EC-selective Reck knockout mice and Wnt7a/b-deficient mice. The hemorrhage can be pharmacologically suppressed by lithium chloride. An effect of RECK in WNT7-producing cells to enhance canonical WNT-signaling in reporter cells is detectable in mixed culture but not with conditioned medium. Our findings suggest that NPC-expressed RECK has a non-cell-autonomous function to promote forebrain angiogenesis through contact-dependent enhancement of WNT signaling in ECs, implying possible involvement of RECK in neurovascular coupling. Mice lacking RECK in Foxg1-positive neural precursor cells die shortly after birth These mice show vascular defects similar to those in mice lacking endothelial RECK The vascular phenotype can be suppressed by LiCl, an activator of WNT signaling RECK in WNT7-producing cell enhances contact-dependent WNT signaling in adjacent cells
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Affiliation(s)
- Huiping Li
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; Laboratory of Single-Molecule Cell Biology, Kyoto University Graduate School of Biostudies, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takao Miki
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Glícia Maria de Almeida
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Carina Hanashima
- Department of Biology, Faculty of Education and Integrated Arts and Sciences, Waseda University, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Tomoko Matsuzaki
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Calvin J Kuo
- Stanford University School of Medicine, Department of Medicine, Division of Hematology, Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA 94305, USA
| | - Naoki Watanabe
- Laboratory of Single-Molecule Cell Biology, Kyoto University Graduate School of Biostudies, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; Department of Pharmacology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Makoto Noda
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan.
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17
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Zhang C, Lai MB, Pedler MG, Johnson V, Adams RH, Petrash JM, Chen Z, Junge HJ. Endothelial Cell-Specific Inactivation of TSPAN12 (Tetraspanin 12) Reveals Pathological Consequences of Barrier Defects in an Otherwise Intact Vasculature. Arterioscler Thromb Vasc Biol 2019; 38:2691-2705. [PMID: 30354230 PMCID: PMC6221394 DOI: 10.1161/atvbaha.118.311689] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Supplemental Digital Content is available in the text. Objective— Blood-CNS (central nervous system) barrier defects are implicated in retinopathies, neurodegenerative diseases, stroke, and epilepsy, yet, the pathological mechanisms downstream of barrier defects remain incompletely understood. Blood-retina barrier (BRB) formation and retinal angiogenesis require β-catenin signaling induced by the ligand norrin (NDP [Norrie disease protein]), the receptor FZD4 (frizzled 4), coreceptor LRP5 (low-density lipoprotein receptor-like protein 5), and the tetraspanin TSPAN12 (tetraspanin 12). Impaired NDP/FZD4 signaling causes familial exudative vitreoretinopathy, which may lead to blindness. This study seeked to define cell type-specific functions of TSPAN12 in the retina. Approach and Results— A loxP-flanked Tspan12 allele was generated and recombined in endothelial cells using a tamoxifen-inducible Cdh5-CreERT2 driver. Resulting phenotypes were documented using confocal microscopy. RNA-Seq, histopathologic analysis, and electroretinogram were performed on retinas of aged mice. We show that TSPAN12 functions in endothelial cells to promote vascular morphogenesis and BRB formation in developing mice and BRB maintenance in adult mice. Early loss of TSPAN12 in endothelial cells causes lack of intraretinal capillaries and increased VE-cadherin (CDH5 [cadherin5 aka VE-cadherin]) expression, consistent with premature vascular quiescence. Late loss of TSPAN12 strongly impairs BRB maintenance without affecting vascular morphogenesis, pericyte coverage, or perfusion. Long-term BRB defects are associated with immunoglobulin extravasation, complement deposition, cystoid edema, and impaired b-wave in electroretinograms. RNA-sequencing reveals transcriptional responses to the perturbation of the BRB, including genes involved in vascular basement membrane alterations in diabetic retinopathy. Conclusions— This study establishes mice with late endothelial cell–specific loss of Tspan12 as a model to study pathological consequences of BRB impairment in an otherwise intact vasculature.
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Affiliation(s)
- Chi Zhang
- From the Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder (C.Z., M.B.L., V.J., Z.C., H.J.J.)
| | - Maria B Lai
- From the Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder (C.Z., M.B.L., V.J., Z.C., H.J.J.)
| | - Michelle G Pedler
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora (M.G.P., J.M.P.)
| | - Verity Johnson
- From the Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder (C.Z., M.B.L., V.J., Z.C., H.J.J.)
| | - Ralf H Adams
- Department of Tissue Morphogenesis, Max Planck Institute for Molecular Biomedicine, Faculty of Medicine, University of Münster, Germany (R.H.A.)
| | - J Mark Petrash
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora (M.G.P., J.M.P.)
| | - Zhe Chen
- From the Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder (C.Z., M.B.L., V.J., Z.C., H.J.J.)
| | - Harald J Junge
- From the Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder (C.Z., M.B.L., V.J., Z.C., H.J.J.)
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18
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Cho C, Wang Y, Smallwood PM, Williams J, Nathans J. Molecular determinants in Frizzled, Reck, and Wnt7a for ligand-specific signaling in neurovascular development. eLife 2019; 8:47300. [PMID: 31225798 PMCID: PMC6588345 DOI: 10.7554/elife.47300] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 06/07/2019] [Indexed: 12/28/2022] Open
Abstract
The molecular basis of Wnt-Frizzled specificity is a central question in developmental biology. Reck, a multi-domain and multi-functional glycosylphosphatidylinositol-anchored protein, specifically enhances beta-catenin signaling by Wnt7a and Wnt7b in cooperation with the 7-transmembrane protein Gpr124. Among amino acids that distinguish Wnt7a and Wnt7b from other Wnts, two clusters are essential for signaling in a Reck- and Gpr124-dependent manner. Both clusters are far from the site of Frizzled binding: one resides at the amino terminus and the second resides in a protruding loop. Within Reck, the fourth of five tandem repeats of an unusual domain with six-cysteines (the CC domain) is essential for Wnt7a stimulation: substitutions P256A and W261A in CC4 eliminate this activity without changing protein abundance or surface localization. Mouse embryos carrying ReckP256A,W261A have severe defects in forebrain angiogenesis, providing the strongest evidence to date that Reck promotes CNS angiogenesis by specifically stimulating Wnt7a and Wnt7b signaling.
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Affiliation(s)
- Chris Cho
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, United States
| | - Yanshu Wang
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, United States.,Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, United States
| | - Philip M Smallwood
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, United States.,Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, United States
| | - John Williams
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, United States.,Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, United States
| | - Jeremy Nathans
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, United States.,Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, United States.,Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, United States.,Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, United States
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19
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Santoro MM, Beltrame M, Panáková D, Siekmann AF, Tiso N, Venero Galanternik M, Jung HM, Weinstein BM. Advantages and Challenges of Cardiovascular and Lymphatic Studies in Zebrafish Research. Front Cell Dev Biol 2019; 7:89. [PMID: 31192207 PMCID: PMC6546721 DOI: 10.3389/fcell.2019.00089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 05/09/2019] [Indexed: 12/12/2022] Open
Abstract
Since its introduction, the zebrafish has provided an important reference system to model and study cardiovascular development as well as lymphangiogenesis in vertebrates. A scientific workshop, held at the 2018 European Zebrafish Principal Investigators Meeting in Trento (Italy) and chaired by Massimo Santoro, focused on the most recent methods and studies on cardiac, vascular and lymphatic development. Daniela Panáková and Natascia Tiso described new molecular mechanisms and signaling pathways involved in cardiac differentiation and disease. Arndt Siekmann and Wiebke Herzog discussed novel roles for Wnt and VEGF signaling in brain angiogenesis. In addition, Brant Weinstein's lab presented data concerning the discovery of endothelium-derived macrophage-like perivascular cells in the zebrafish brain, while Monica Beltrame's studies refined the role of Sox transcription factors in vascular and lymphatic development. In this article, we will summarize the details of these recent discoveries in support of the overall value of the zebrafish model system not only to study normal development, but also associated disease states.
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Affiliation(s)
- Massimo M Santoro
- Laboratory of Angiogenesis and Redox Metabolism, Department of Biology, University of Padua, Padua, Italy
| | - Monica Beltrame
- Dipartimento di Bioscienze, Università degli Studi di Milano, Milan, Italy
| | - Daniela Panáková
- Electrochemical Signaling in Development and Disease, Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers (HZ), Berlin, Germany.,German Centre for Cardiovascular Research: DZHK, Berlin, Germany
| | - Arndt F Siekmann
- Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Cells in Motion Cluster of Excellence (CiM), University of Münster, Münster, Germany.,Department of Cell and Developmental Biology and Cardiovascular Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, United States
| | - Natascia Tiso
- Laboratory of Developmental Genetics, Department of Biology, University of Padua, Padua, Italy
| | - Marina Venero Galanternik
- Division of Developmental Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, United States
| | - Hyun Min Jung
- Division of Developmental Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, United States
| | - Brant M Weinstein
- Division of Developmental Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, United States
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20
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Abstract
PURPOSE OF REVIEW Zebrafish has provided a powerful platform to study vascular biology over the past 25 years, owing to their distinct advantages for imaging and genetic manipulation. In this review, we summarize recent progress in vascular biology with particular emphasis on vascular development in zebrafish. RECENT FINDINGS The advent of transcription activator-like effector nuclease and clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 genome-editing technologies has dramatically facilitated reverse genetic approaches in zebrafish, as in other models. Here, we highlight recent studies on vascular development in zebrafish which mainly employed forward or reverse genetics combined with high-resolution imaging. These studies have advanced our understanding of diverse areas in vascular biology, including transcriptional regulation of endothelial cell differentiation, endothelial cell signaling during angiogenesis and lymphangiogenesis, vascular bed-specific developmental mechanisms, and perivascular cell recruitment. SUMMARY The unique attributes of the zebrafish model have allowed critical cellular and molecular insights into fundamental mechanisms of vascular development. Knowledge acquired through recent zebrafish work further advances our understanding of basic mechanisms underlying vascular morphogenesis, maintenance, and homeostasis. Ultimately, insights provided by the zebrafish model will help to understand the genetic, cellular, and molecular underpinnings of human vascular malformations and diseases.
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21
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Interplay of the Norrin and Wnt7a/Wnt7b signaling systems in blood-brain barrier and blood-retina barrier development and maintenance. Proc Natl Acad Sci U S A 2018; 115:E11827-E11836. [PMID: 30478038 DOI: 10.1073/pnas.1813217115] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
β-Catenin signaling controls the development and maintenance of the blood-brain barrier (BBB) and the blood-retina barrier (BRB), but the division of labor and degree of redundancy between the two principal ligand-receptor systems-the Norrin and Wnt7a/Wnt7b systems-are incompletely defined. Here, we present a loss-of-function genetic analysis of postnatal BBB and BRB maintenance in mice that shows striking threshold and partial redundancy effects. In particular, the combined loss of Wnt7a and Norrin or Wnt7a and Frizzled4 (Fz4) leads to anatomically localized BBB defects that are far more severe than observed with loss of Wnt7a, Norrin, or Fz4 alone. In the cerebellum, selective loss of Wnt7a in glia combined with ubiquitous loss of Norrin recapitulates the phenotype observed with ubiquitous loss of both Wnt7a and Norrin, implying that glia are the source of Wnt7a in the cerebellum. Tspan12, a coactivator of Norrin signaling in the retina, is also active in BBB maintenance but is less potent than Norrin, consistent with a model in which Tspan12 enhances the amplitude of the Norrin signal in vascular endothelial cells. Finally, in the context of a partially impaired Norrin system, the retina reveals a small contribution to BRB development from the Wnt7a/Wnt7b system. Taken together, these experiments define the extent of CNS region-specific cooperation for several components of the Norrin and Wnt7a/Wnt7b systems, and they reveal substantial regional heterogeneity in the extent to which partially redundant ligands, receptors, and coactivators maintain the BBB and BRB.
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22
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Hübner K, Cabochette P, Diéguez-Hurtado R, Wiesner C, Wakayama Y, Grassme KS, Hubert M, Guenther S, Belting HG, Affolter M, Adams RH, Vanhollebeke B, Herzog W. Wnt/β-catenin signaling regulates VE-cadherin-mediated anastomosis of brain capillaries by counteracting S1pr1 signaling. Nat Commun 2018; 9:4860. [PMID: 30451830 PMCID: PMC6242933 DOI: 10.1038/s41467-018-07302-x] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 10/15/2018] [Indexed: 02/08/2023] Open
Abstract
Canonical Wnt signaling is crucial for vascularization of the central nervous system and blood-brain barrier (BBB) formation. BBB formation and modulation are not only important for development, but also relevant for vascular and neurodegenerative diseases. However, there is little understanding of how Wnt signaling contributes to brain angiogenesis and BBB formation. Here we show, using high resolution in vivo imaging and temporal and spatial manipulation of Wnt signaling, different requirements for Wnt signaling during brain angiogenesis and BBB formation. In the absence of Wnt signaling, premature Sphingosine-1-phosphate receptor (S1pr) signaling reduces VE-cadherin and Esama at cell-cell junctions. We suggest that Wnt signaling suppresses S1pr signaling during angiogenesis to enable the dynamic junction formation during anastomosis, whereas later S1pr signaling regulates BBB maturation and VE-cadherin stabilization. Our data provides a link between brain angiogenesis and BBB formation and identifies Wnt signaling as coordinator of the timing and as regulator of anastomosis.
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Affiliation(s)
- Kathleen Hübner
- University of Muenster, Schlossplatz 2, 48149, Muenster, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM), University of Muenster, Waldeyerstrasse 15, 48149, Muenster, Germany
| | - Pauline Cabochette
- Université libre de Bruxelles, Rue Prof. Jeener et Brachet 12, 6041, Gosselies, Belgium
| | - Rodrigo Diéguez-Hurtado
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM), University of Muenster, Waldeyerstrasse 15, 48149, Muenster, Germany
- Max Planck Institute for Molecular Biomedicine, Roentgenstrasse 20, 48149, Muenster, Germany
| | - Cora Wiesner
- Biozentrum der Universität Basel, Klingelbergstrasse 70, 4056, Basel, Switzerland
| | - Yuki Wakayama
- University of Muenster, Schlossplatz 2, 48149, Muenster, Germany
| | | | - Marvin Hubert
- University of Muenster, Schlossplatz 2, 48149, Muenster, Germany
| | - Stefan Guenther
- Max Planck Institute for Heart and Lung Research, ECCPS Bioinformatics and Deep Sequencing Platform, Ludwigstrasse 43, 61231, Bad Nauheim, Germany
| | - Heinz-Georg Belting
- Biozentrum der Universität Basel, Klingelbergstrasse 70, 4056, Basel, Switzerland
| | - Markus Affolter
- Biozentrum der Universität Basel, Klingelbergstrasse 70, 4056, Basel, Switzerland
| | - Ralf H Adams
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM), University of Muenster, Waldeyerstrasse 15, 48149, Muenster, Germany
- Max Planck Institute for Molecular Biomedicine, Roentgenstrasse 20, 48149, Muenster, Germany
| | - Benoit Vanhollebeke
- Université libre de Bruxelles, Rue Prof. Jeener et Brachet 12, 6041, Gosselies, Belgium
- Walloon Excellence in Life Sciences and Biotechnology (WELBIO), Avenue Pasteur 6, 1300, Wavre, Belgium
| | - Wiebke Herzog
- University of Muenster, Schlossplatz 2, 48149, Muenster, Germany.
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM), University of Muenster, Waldeyerstrasse 15, 48149, Muenster, Germany.
- Max Planck Institute for Molecular Biomedicine, Roentgenstrasse 20, 48149, Muenster, Germany.
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23
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Eubelen M, Bostaille N, Cabochette P, Gauquier A, Tebabi P, Dumitru AC, Koehler M, Gut P, Alsteens D, Stainier DYR, Garcia-Pino A, Vanhollebeke B. A molecular mechanism for Wnt ligand-specific signaling. Science 2018; 361:science.aat1178. [PMID: 30026314 DOI: 10.1126/science.aat1178] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 06/26/2018] [Indexed: 12/29/2022]
Abstract
Wnt signaling is key to many developmental, physiological, and disease processes in which cells seem able to discriminate between multiple Wnt ligands. This selective Wnt recognition or "decoding" capacity has remained enigmatic because Wnt/Frizzled interactions are largely incompatible with monospecific recognition. Gpr124 and Reck enable brain endothelial cells to selectively respond to Wnt7. We show that Reck binds with low micromolar affinity to the intrinsically disordered linker region of Wnt7. Availability of Reck-bound Wnt7 for Frizzled signaling relies on the interaction between Gpr124 and Dishevelled. Through polymerization, Dishevelled recruits Gpr124 and the associated Reck-bound Wnt7 into dynamic Wnt/Frizzled/Lrp5/6 signalosomes, resulting in increased local concentrations of Wnt7 available for Frizzled signaling. This work provides mechanistic insights into the Wnt decoding capacities of vertebrate cells and unravels structural determinants of the functional diversification of Wnt family members.
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Affiliation(s)
- Marie Eubelen
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Naguissa Bostaille
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Pauline Cabochette
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Anne Gauquier
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Patricia Tebabi
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Andra C Dumitru
- NanoBiophysics Laboratory, Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Melanie Koehler
- NanoBiophysics Laboratory, Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Philipp Gut
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - David Alsteens
- NanoBiophysics Laboratory, Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Didier Y R Stainier
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany
| | - Abel Garcia-Pino
- Laboratory of Cellular and Molecular Microbiology, Department of Molecular Biology, ULB, Gosselies B-6041, Belgium.,Walloon Excellence in Life Sciences and Biotechnology (WELBIO), Belgium
| | - Benoit Vanhollebeke
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium. .,Walloon Excellence in Life Sciences and Biotechnology (WELBIO), Belgium.,Center for Microscopy and Molecular Imaging (CMMI), ULB, Gosselies B-6041, Belgium
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24
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Bukiya AN, Dopico AM. Fetal Cerebral Circulation as Target of Maternal Alcohol Consumption. Alcohol Clin Exp Res 2018; 42:1006-1018. [PMID: 29672868 PMCID: PMC5984173 DOI: 10.1111/acer.13755] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 04/08/2018] [Indexed: 12/29/2022]
Abstract
Alcohol (ethanol [EtOH]) is one of the most widely used psychoactive substances worldwide. Alcohol consumption during pregnancy may result in a wide range of morphological and neurodevelopmental abnormalities termed fetal alcohol spectrum disorders (FASD), with the most severe cases diagnosed as fetal alcohol syndrome (FAS). FAS and FASD are not readily curable and currently represent the leading preventable causes of birth defect and neurodevelopmental delay in the United States. The etiology of FAS/FASD remains poorly understood. This review focuses on the effects of prenatal alcohol exposure (PAE) on fetal cerebrovascular function. A brief introduction to the epidemiology of alcohol consumption and the developmental characteristics of fetal cerebral circulation is followed by several sections that discuss current evidence documenting alcohol-driven alterations of fetal cerebral blood flow, artery function, and microvessel networks. The material offers mechanistic insights at the vascular level itself into the pathophysiology of PAE.
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Affiliation(s)
- Anna N Bukiya
- Department of Pharmacology, University of Tennessee Health Science Center, Memphis, Tennessee
| | - Alex M Dopico
- Department of Pharmacology, University of Tennessee Health Science Center, Memphis, Tennessee
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25
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Paredes I, Himmels P, Ruiz de Almodóvar C. Neurovascular Communication during CNS Development. Dev Cell 2018; 45:10-32. [PMID: 29634931 DOI: 10.1016/j.devcel.2018.01.023] [Citation(s) in RCA: 140] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 11/22/2017] [Accepted: 01/08/2018] [Indexed: 12/11/2022]
Abstract
A precise communication between the nervous and the vascular systems is crucial for proper formation and function of the central nervous system (CNS). Interestingly, this communication does not only occur by neural cells regulating the growth and properties of the vasculature, but new studies show that blood vessels actively control different neurodevelopmental processes. Here, we review the current knowledge on how neurons in particular influence growing blood vessels during CNS development and on how vessels participate in shaping the neural compartment. We also review the identified molecular mechanisms of this bidirectional communication.
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Affiliation(s)
- Isidora Paredes
- Biochemistry Center, Heidelberg University, 69120 Heidelberg, Germany; Interdisciplinary Center for Neurosciences, Heidelberg University, 69120 Heidelberg, Germany
| | - Patricia Himmels
- Biochemistry Center, Heidelberg University, 69120 Heidelberg, Germany; Interdisciplinary Center for Neurosciences, Heidelberg University, 69120 Heidelberg, Germany
| | - Carmen Ruiz de Almodóvar
- Biochemistry Center, Heidelberg University, 69120 Heidelberg, Germany; Interdisciplinary Center for Neurosciences, Heidelberg University, 69120 Heidelberg, Germany.
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26
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TSPAN12 Is a Norrin Co-receptor that Amplifies Frizzled4 Ligand Selectivity and Signaling. Cell Rep 2018; 19:2809-2822. [PMID: 28658627 DOI: 10.1016/j.celrep.2017.06.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 03/29/2017] [Accepted: 05/27/2017] [Indexed: 11/23/2022] Open
Abstract
Accessory proteins in Frizzled (FZD) receptor complexes are thought to determine ligand selectivity and signaling amplitude. Genetic evidence indicates that specific combinations of accessory proteins and ligands mediate vascular β-catenin signaling in different CNS structures. In the retina, the tetraspanin TSPAN12 and the ligand norrin (NDP) mediate angiogenesis, and both genes are linked to familial exudative vitreoretinopathy (FEVR), yet the molecular function of TSPAN12 remains poorly understood. Here, we report that TSPAN12 is an essential component of the NDP receptor complex and interacts with FZD4 and NDP via its extracellular loops, consistent with an action as co-receptor that enhances FZD4 ligand selectivity for NDP. FEVR-linked mutations in TSPAN12 prevent the incorporation of TSPAN12 into the NDP receptor complex. In vitro and in Xenopus embryos, TSPAN12 alleviates defects of FZD4 M105V, a mutation that destabilizes the NDP/FZD4 interaction. This study sheds light on the poorly understood function of accessory proteins in FZD signaling.
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27
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Abstract
CNS angiogenesis and blood-brain barrier integrity are controlled by the canonical Wnt pathway. In this issue of Neuron, Cho et al. (2017) use advanced mouse genetics and biochemical experiments to unravel the ligand-specific association of membrane proteins GPR124 and RECK with Wnt receptor complexes.
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Affiliation(s)
- Harald J Junge
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.
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28
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Hogan BM, Schulte-Merker S. How to Plumb a Pisces: Understanding Vascular Development and Disease Using Zebrafish Embryos. Dev Cell 2017; 42:567-583. [PMID: 28950100 DOI: 10.1016/j.devcel.2017.08.015] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 08/01/2017] [Accepted: 08/21/2017] [Indexed: 01/09/2023]
Abstract
Our vasculature plays diverse and critical roles in homeostasis and disease. In recent decades, the use of zebrafish has driven our understanding of vascular development into new areas, identifying new genes and mechanisms controlling vessel formation and allowing unprecedented observation of the cellular and molecular events that shape the developing vasculature. Here, we highlight key mechanisms controlling formation of the zebrafish vasculature and investigate how knowledge from this highly tractable model system has informed our understanding of vascular disease in humans.
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Affiliation(s)
- Benjamin M Hogan
- Division of Genomics of Development and Disease, Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Road, St Lucia, Brisbane, QLD 4072, Australia.
| | - Stefan Schulte-Merker
- Institute for Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WWU Münster, Münster 48149, Germany; Cells-in-Motion Cluster of Excellence (EXC-1003), WWU Münster, 48149 Münster, Germany.
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29
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Hübner K, Grassme KS, Rao J, Wenke NK, Zimmer CL, Korte L, Müller K, Sumanas S, Greber B, Herzog W. Wnt signaling positively regulates endothelial cell fate specification in the Fli1a-positive progenitor population via Lef1. Dev Biol 2017; 430:142-155. [DOI: 10.1016/j.ydbio.2017.08.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 08/03/2017] [Accepted: 08/03/2017] [Indexed: 01/06/2023]
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30
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Chow BW, Gu C. Gradual Suppression of Transcytosis Governs Functional Blood-Retinal Barrier Formation. Neuron 2017; 93:1325-1333.e3. [PMID: 28334606 DOI: 10.1016/j.neuron.2017.02.043] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 11/14/2016] [Accepted: 02/22/2017] [Indexed: 12/26/2022]
Abstract
Blood-central nervous system (CNS) barriers partition neural tissues from the blood, providing a homeostatic environment for proper neural function. The endothelial cells that form blood-CNS barriers have specialized tight junctions and low rates of transcytosis to limit the flux of substances between blood and CNS. However, the relative contributions of these properties to CNS barrier permeability are unknown. Here, by studying functional blood-retinal barrier (BRB) formation in mice, we found that immature vessel leakage occurs entirely through transcytosis, as specialized tight junctions are functional as early as vessel entry into the CNS. A functional barrier forms only when transcytosis is gradually suppressed during development. Mutant mice with elevated or reduced levels of transcytosis have delayed or precocious sealing of the BRB, respectively. Therefore, the temporal regulation of transcytosis governs the development of a functional BRB, and suppression of transcytosis is a principal contributor for functional barrier formation.
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Affiliation(s)
- Brian Wai Chow
- Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, MA 02115, USA
| | - Chenghua Gu
- Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, MA 02115, USA.
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31
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Cho C, Smallwood PM, Nathans J. Reck and Gpr124 Are Essential Receptor Cofactors for Wnt7a/Wnt7b-Specific Signaling in Mammalian CNS Angiogenesis and Blood-Brain Barrier Regulation. Neuron 2017; 95:1056-1073.e5. [PMID: 28803732 PMCID: PMC5586543 DOI: 10.1016/j.neuron.2017.07.031] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 06/14/2017] [Accepted: 07/26/2017] [Indexed: 10/19/2022]
Abstract
Reck, a GPI-anchored membrane protein, and Gpr124, an orphan GPCR, have been implicated in Wnt7a/Wnt7b signaling in the CNS vasculature. We show here that vascular endothelial cell (EC)-specific reduction in Reck impairs CNS angiogenesis and that EC-specific postnatal loss of Reck, combined with loss of Norrin, impairs blood-brain barrier (BBB) maintenance. The most N-terminal domain of Reck binds to the leucine-rich repeat (LRR) and immunoglobulin (Ig) domains of Gpr124, and weakening this interaction by targeted mutagenesis reduces Reck/Gpr124 stimulation of Wnt7a signaling in cell culture and impairs CNS angiogenesis. Finally, a soluble Gpr124(LRR-Ig) probe binds to cells expressing Frizzled, Wnt7a or Wnt7b, and Reck, and a soluble Reck(CC1-5) probe binds to cells expressing Frizzled, Wnt7a or Wnt7b, and Gpr124. These experiments indicate that Reck and Gpr124 are part of the cell surface protein complex that transduces Wnt7a- and Wnt7b-specific signals in mammalian CNS ECs to promote angiogenesis and regulate the BBB.
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Affiliation(s)
- Chris Cho
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Philip M Smallwood
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Jeremy Nathans
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
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32
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Bostaille N, Gauquier A, Twyffels L, Vanhollebeke B. Molecular insights into Adgra2/Gpr124 and Reck intracellular trafficking. Biol Open 2016; 5:1874-1881. [PMID: 27979830 PMCID: PMC5200908 DOI: 10.1242/bio.021287] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Adgra2, formerly known as Gpr124, is a key regulator of cerebrovascular development in vertebrates. Together with the GPI-anchored glycoprotein Reck, this adhesion GPCR (aGPCR) stimulates Wnt7-dependent Wnt/β-catenin signaling to promote brain vascular invasion in an endothelial cell-autonomous manner. Adgra2 and Reck have been proposed to assemble a receptor complex at the plasma membrane, but the molecular modalities of their functional synergy remain to be investigated. In particular, as typically found in aGPCRs, the ectodomain of Adgra2 is rich in protein-protein interaction motifs whose contributions to receptor function are unknown. In opposition to the severe ADGRA2 genetic lesions found in previously generated zebrafish and mouse models, the zebrafish ouchless allele encodes an aberrantly-spliced and inactive receptor lacking a single leucine-rich repeat (LRR) unit within its N-terminus. By characterizing this allele we uncover that, in contrast to all other extracellular domains, the precise composition of the LRR domain determines proper receptor trafficking to the plasma membrane. Using CRISPR/Cas9 engineered cells, we further show that Adgra2 trafficking occurs in a Reck-independent manner and that, similarly, Reck reaches the plasma membrane irrespective of Adgra2 expression or localization, suggesting that the partners meet at the plasma membrane after independent intracellular trafficking events. Summary: This work uncovers molecular determinants of Adgra2/Gpr124 and Reck trafficking to the plasma membrane where the partners meet to act as potent Wnt7-specific Wnt/β-catenin signaling co-activators required for brain vascularization.
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Affiliation(s)
- Naguissa Bostaille
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Anne Gauquier
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Laure Twyffels
- Center for Microscopy and Molecular Imaging, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
| | - Benoit Vanhollebeke
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium .,Center for Microscopy and Molecular Imaging, Université libre de Bruxelles (ULB), Gosselies B-6041, Belgium
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33
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Noda M, Vallon M, Kuo CJ. The Wnt7's Tale: A story of an orphan who finds her tie to a famous family. Cancer Sci 2016; 107:576-82. [PMID: 26934061 PMCID: PMC4970824 DOI: 10.1111/cas.12924] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 02/22/2016] [Accepted: 02/29/2016] [Indexed: 12/11/2022] Open
Abstract
The transformation suppressor gene RECK was isolated by cDNA expression cloning (1998), and GPR124/TEM5 was detected as a tumor endothelial marker by differential screening (2000). The importance of Wnt7a/b and Gpr124 in brain angiogenesis was demonstrated by reverse genetics in mice (2008–2010). A series of recent studies using genetically engineered mice and zebrafish as well as luciferase reporter assays in cultured cells led to the discovery of functional interactions among Reck, Gpr124, and Wnt7a/b in triggering canonical Wnt signaling with relevance to embryonic brain angiogenesis and blood–brain barrier formation.
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Affiliation(s)
- Makoto Noda
- Department of Molecular Oncology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Mario Vallon
- Hematology Division, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
| | - Calvin J Kuo
- Hematology Division, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
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34
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Bostaille N, Gauquier A, Stainier DYR, Raible DW, Vanhollebeke B. Defective adgra2 (gpr124) splicing and function in zebrafish ouchless mutants. Development 2016; 144:8-11. [DOI: 10.1242/dev.146803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
ABSTRACT
A hitherto unidentified N-ethyl-N-nitrosourea (ENU)-induced mutation affects dorsal root ganglia (DRG) formation in ouchless mutant zebrafish larvae. In contrast to previous findings assigning the ouchless phenotypes to downregulated sorbs3 transcript levels, this work re-attributes the phenotypes to an essential splice site mutation affecting adgra2 (gpr124) splicing and function. Accordingly, ouchless mutants fail to complement previously characterized adgra2 mutants and exhibit highly penetrant cerebrovascular defects. The aberrantly spliced adgra2 transcript found in ouchless mutants encodes a receptor lacking a single leucine-rich repeat (LRR) within its N-terminus.
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Affiliation(s)
- Naguissa Bostaille
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), B-6041 Gosselies, Belgium
| | - Anne Gauquier
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), B-6041 Gosselies, Belgium
| | - Didier Y. R. Stainier
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany
| | - David W. Raible
- Department of Biological Structure, University of Washington, Seattle, WA 98195, USA
| | - Benoit Vanhollebeke
- Laboratory of Neurovascular Signaling, Department of Molecular Biology, ULB Neuroscience Institute, Université libre de Bruxelles (ULB), B-6041 Gosselies, Belgium
- Center for Microscopy and Molecular Imaging, Université libre de Bruxelles (ULB), B-6041 Gosselies, Belgium
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35
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Ulrich F, Grove C, Torres-Vázquez J, Baker R. Development of functional hindbrain oculomotor circuitry independent of both vascularization and neuronal activity in larval zebrafish. CURRENT NEUROBIOLOGY 2016; 7:62-73. [PMID: 30135618 PMCID: PMC6101672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigated the contribution of blood vessel formation and neuronal excitability to the development of functional neural circuitry in larval zebrafish by analyzing oculomotor performance in response to visual and vestibular stimuli. To address the dependence of neuronal function on the presence of blood vessels, we compared wild type embryos to reck and cloche mutants that lacked intracerebral blood vessels. To test how neuronal excitability impacts neuronal development and intracerebral vascularization, we blocked neural activity using Tetraodotoxin (TTX) and Tricaine. In reck mutants, we found both slow phase horizontal tracking and fast phase resets with only a slightly reduced amplitude and bandwidth. Spontaneous saccades, eye position holding and vestibular gravitoinertial induced eye rotation were also present. All of these behaviors except for visual tracking were observed in cloche mutants that lacked any head vasculature. Thus, numerous oculomotor neuronal circuits spanning the forebrain, midbrain and hindbrain compartments, ending in motor innervations of the eye muscles, were correctly formed and generated appropriate oculomotor behaviors without blood vessels. However, our observations indicate that beginning at approximately six days, circulation was required for sustained behavioral performance. We further found that blocking neuronal excitability with either TTX or Tricaine up to 4-5 days post fertilization did not noticeably interfere with intracerebral blood vessel formation in wild type larvae. After removal of drug treatments, the oculomotor behaviors returned within hours. Thus, development of neuronal circuits that drive oculomotor performance does not require neuronal spiking or activity. Together these findings demonstrate that neither vascularization nor neuronal excitability are essential for the formation of numerous oculomotor nuclei with intricately designed connectivity and signal processing. We conclude that a genetic blueprint specifies early larval structural and physiological features, and this developmental strategy may be viewed as a unique adaptation required for early survival.
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Affiliation(s)
- Florian Ulrich
- Department of Developmental Genetics, Skirball Institute of Molecular Medicine, 540 1st Avenue, New York City, New York 10016, USA
| | - Charlotte Grove
- Department of Neuroscience and Physiology, New York University Medical Center, 550 1st Avenue, New York City, New York 10016, USA
| | - Jesús Torres-Vázquez
- Department of Developmental Genetics, Skirball Institute of Molecular Medicine, 540 1st Avenue, New York City, New York 10016, USA
| | - Robert Baker
- Department of Neuroscience and Physiology, New York University Medical Center, 550 1st Avenue, New York City, New York 10016, USA
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