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Hu L, Chen W, Qian A, Li YP. Wnt/β-catenin signaling components and mechanisms in bone formation, homeostasis, and disease. Bone Res 2024; 12:39. [PMID: 38987555 PMCID: PMC11237130 DOI: 10.1038/s41413-024-00342-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 04/27/2024] [Accepted: 05/12/2024] [Indexed: 07/12/2024] Open
Abstract
Wnts are secreted, lipid-modified proteins that bind to different receptors on the cell surface to activate canonical or non-canonical Wnt signaling pathways, which control various biological processes throughout embryonic development and adult life. Aberrant Wnt signaling pathway underlies a wide range of human disease pathogeneses. In this review, we provide an update of Wnt/β-catenin signaling components and mechanisms in bone formation, homeostasis, and diseases. The Wnt proteins, receptors, activators, inhibitors, and the crosstalk of Wnt signaling pathways with other signaling pathways are summarized and discussed. We mainly review Wnt signaling functions in bone formation, homeostasis, and related diseases, and summarize mouse models carrying genetic modifications of Wnt signaling components. Moreover, the therapeutic strategies for treating bone diseases by targeting Wnt signaling, including the extracellular molecules, cytosol components, and nuclear components of Wnt signaling are reviewed. In summary, this paper reviews our current understanding of the mechanisms by which Wnt signaling regulates bone formation, homeostasis, and the efforts targeting Wnt signaling for treating bone diseases. Finally, the paper evaluates the important questions in Wnt signaling to be further explored based on the progress of new biological analytical technologies.
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Affiliation(s)
- Lifang Hu
- Laboratory for Bone Metabolism, Xi'an Key Laboratory of Special Medicine and Health Engineering, Key Laboratory for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China
| | - Wei Chen
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, 70112, USA
| | - Airong Qian
- Laboratory for Bone Metabolism, Xi'an Key Laboratory of Special Medicine and Health Engineering, Key Laboratory for Space Biosciences and Biotechnology, Research Center for Special Medicine and Health Systems Engineering, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, China.
| | - Yi-Ping Li
- Division in Cellular and Molecular Medicine, Department of Pathology and Laboratory Medicine, Tulane University School of Medicine, Tulane University, New Orleans, LA, 70112, USA.
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2
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Aboul-Soud MAM, Al-Sheikh YA, Ghneim HK, Supuran CT, Carta F. Kinase inhibitors: 20 years of success and many new challenges and recent trends in their patents. Expert Opin Ther Pat 2024; 34:583-592. [PMID: 38784980 DOI: 10.1080/13543776.2024.2355247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 05/10/2024] [Indexed: 05/25/2024]
Abstract
INTRODUCTION Protein kinases (PKs) play key roles in cellular signaling and regulation cascades and therefore are listed among the most investigated enzymes with the intent to develop drugs that are able to modulate their catalytic features. Specifically, PKs are involved in chronic diseases of large impact in the society such as cancers and neurodegeneration. Since the approval of Fasudil for the management of cerebral vasospasm, frantic efforts are currently ongoing for the development of selective PK-modulating agents. AREAS COVERED A selection of the most relevant patents in the European Patent Office for biomedical innovation and/or industrial development covering the years 2020-2023 on PK modulators either of the antibody and small-molecule type is reported. In addition to the examined patents, we also reported the contributions claiming the use of antibody-targeted PKs for lab bench identification kits. EXPERT OPINION The field of PK modulators for biomedical purposes is particularly crowded with contributions, making it rich in valuable information for the development of potential drugs. An emerging frontier is represented by PK activators that aims to complement the use of PK inhibitors with the final intent of finely adjusting any PK-related disruption responsible for triggering any disease.
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Affiliation(s)
- Mourad A M Aboul-Soud
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Yazeed A Al-Sheikh
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Hazem K Ghneim
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Claudiu T Supuran
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche e Nutraceutiche, University of Florence, Sesto Fiorentino, Florence, Italy
| | - Fabrizio Carta
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche e Nutraceutiche, University of Florence, Sesto Fiorentino, Florence, Italy
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3
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Qin K, Yu M, Fan J, Wang H, Zhao P, Zhao G, Zeng W, Chen C, Wang Y, Wang A, Schwartz Z, Hong J, Song L, Wagstaff W, Haydon RC, Luu HH, Ho SH, Strelzow J, Reid RR, He TC, Shi LL. Canonical and noncanonical Wnt signaling: Multilayered mediators, signaling mechanisms and major signaling crosstalk. Genes Dis 2024; 11:103-134. [PMID: 37588235 PMCID: PMC10425814 DOI: 10.1016/j.gendis.2023.01.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 11/01/2022] [Accepted: 01/29/2023] [Indexed: 08/18/2023] Open
Abstract
Wnt signaling plays a major role in regulating cell proliferation and differentiation. The Wnt ligands are a family of 19 secreted glycoproteins that mediate their signaling effects via binding to Frizzled receptors and LRP5/6 coreceptors and transducing the signal either through β-catenin in the canonical pathway or through a series of other proteins in the noncanonical pathway. Many of the individual components of both canonical and noncanonical Wnt signaling have additional functions throughout the body, establishing the complex interplay between Wnt signaling and other signaling pathways. This crosstalk between Wnt signaling and other pathways gives Wnt signaling a vital role in many cellular and organ processes. Dysregulation of this system has been implicated in many diseases affecting a wide array of organ systems, including cancer and embryological defects, and can even cause embryonic lethality. The complexity of this system and its interacting proteins have made Wnt signaling a target for many therapeutic treatments. However, both stimulatory and inhibitory treatments come with potential risks that need to be addressed. This review synthesized much of the current knowledge on the Wnt signaling pathway, beginning with the history of Wnt signaling. It thoroughly described the different variants of Wnt signaling, including canonical, noncanonical Wnt/PCP, and the noncanonical Wnt/Ca2+ pathway. Further description involved each of its components and their involvement in other cellular processes. Finally, this review explained the various other pathways and processes that crosstalk with Wnt signaling.
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Affiliation(s)
- Kevin Qin
- Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Michael Yu
- Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Jiaming Fan
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Ministry of Education Key Laboratory of Diagnostic Medicine, and Department of Clinical Biochemistry, The School of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Hongwei Wang
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Piao Zhao
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Departments of Orthopaedic Surgery and Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Guozhi Zhao
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Departments of Orthopaedic Surgery and Urology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Wei Zeng
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Department of Interventional Neurology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong 523475, China
| | - Connie Chen
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Yonghui Wang
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Department of Clinical Laboratory Medicine, Shanghai Jiaotong University School of Medicine, Shanghai 200000, China
| | - Annie Wang
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Laboratory of Craniofacial Biology and Development, Department of Surgery Section of Plastic Surgery, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Zander Schwartz
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- School of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235, USA
| | - Jeffrey Hong
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Lily Song
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - William Wagstaff
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Rex C. Haydon
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Hue H. Luu
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Sherwin H. Ho
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Jason Strelzow
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Russell R. Reid
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Laboratory of Craniofacial Biology and Development, Department of Surgery Section of Plastic Surgery, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Tong-Chuan He
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
- Laboratory of Craniofacial Biology and Development, Department of Surgery Section of Plastic Surgery, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Lewis L. Shi
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
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δ-Protocadherins regulate neural progenitor cell division by antagonizing Ryk and Wnt/β-catenin signaling. iScience 2021; 24:102932. [PMID: 34430817 PMCID: PMC8374482 DOI: 10.1016/j.isci.2021.102932] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 05/10/2021] [Accepted: 07/28/2021] [Indexed: 12/24/2022] Open
Abstract
The division of neural progenitor cells provides the cellular substrate from which the nervous system is sculpted during development. The δ-protocadherin family of homophilic cell adhesion molecules is essential for the development of the vertebrate nervous system and is implicated in an array of neurodevelopmental disorders. We show that lesions in any of six, individual δ-protocadherins increases cell divisions of neural progenitors in the hindbrain. This increase is due to mis-regulation of Wnt/β-catenin signaling, as this pathway is upregulated in δ-protocadherin mutants and inhibition of this pathway blocks the increase in cell division. Furthermore, the δ-protocadherins can be present in complex with the Wnt receptor Ryk, and Ryk is required for the increased proliferation in protocadherin mutants. Thus, δ-protocadherins are novel regulators of Wnt/β-catenin signaling that may control the development of neural circuits by defining a molecular code for the identity of neural progenitor cells and differentially regulating their proliferation.
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Cannarozzo C, Fred SM, Girych M, Biojone C, Enkavi G, Róg T, Vattulainen I, Casarotto PC, Castrén E. Cholesterol-recognition motifs in the transmembrane domain of the tyrosine kinase receptor family: The case of TRKB. Eur J Neurosci 2021; 53:3311-3322. [PMID: 33825223 DOI: 10.1111/ejn.15218] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/28/2021] [Accepted: 03/29/2021] [Indexed: 01/19/2023]
Abstract
Cholesterol is an essential constituent of cell membranes. The discovery of cholesterol-recognition amino acid consensus (CRAC) motif in proteins indicated a putative direct, non-covalent interaction between cholesterol and proteins. In the present study, we evaluated the presence of a CRAC motif and its inverted version (CARC) in the transmembrane region (TMR) of the tyrosine kinase receptor family (RTK) in several species using in silico methods. CRAC motifs were found across all species analyzed, while CARC was found only in vertebrates. The tropomyosin-related kinase B (TRKB), a member of the RTK family, through interaction with its endogenous ligand brain-derived neurotrophic factor (BDNF) is a core participant in the neuronal plasticity process and exhibits a CARC motif in its TMR. Upon identifying the conserved CARC motif in the TRKB, we performed molecular dynamics simulations of the mouse TRKB.TMR. The simulations indicated that cholesterol interaction with the TRKB CARC motif occurs mainly at the central Y433 residue. Our binding assay suggested a bell-shaped effect of cholesterol on BDNF interaction with TRKB receptors, and our results suggest that CARC/CRAC motifs may play a role in the function of the RTK family TMR.
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Affiliation(s)
| | - Senem Merve Fred
- Neuroscience Center - HiLife, University of Helsinki, Helsinki, Finland
| | - Mykhailo Girych
- Department of Physics, University of Helsinki, Helsinki, Finland
| | - Caroline Biojone
- Neuroscience Center - HiLife, University of Helsinki, Helsinki, Finland
| | - Giray Enkavi
- Department of Physics, University of Helsinki, Helsinki, Finland
| | - Tomasz Róg
- Department of Physics, University of Helsinki, Helsinki, Finland
| | - Ilpo Vattulainen
- Department of Physics, University of Helsinki, Helsinki, Finland
- Computational Physics Laboratory, Tampere University, Tampere, Finland
| | | | - Eero Castrén
- Neuroscience Center - HiLife, University of Helsinki, Helsinki, Finland
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6
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Huang H. Proteolytic Cleavage of Receptor Tyrosine Kinases. Biomolecules 2021; 11:biom11050660. [PMID: 33947097 PMCID: PMC8145142 DOI: 10.3390/biom11050660] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/15/2021] [Accepted: 04/26/2021] [Indexed: 01/18/2023] Open
Abstract
The receptor tyrosine kinases (RTKs) are a large family of cell-surface receptors, which are essential components of signal transduction pathways. There are more than fifty human RTKs that can be grouped into multiple RTK subfamilies. RTKs mediate cellular signaling transduction, and they play important roles in the regulation of numerous cellular processes. The dysregulation of RTK signaling is related to various human diseases, including cancers. The proteolytic cleavage phenomenon has frequently been found among multiple receptor tyrosine kinases. More and more information about proteolytic cleavage in RTKs has been discovered, providing rich insight. In this review, we summarize research about different aspects of RTK cleavage, including its relation to cancer, to better elucidate this phenomenon. This review also presents proteolytic cleavage in various members of the RTKs.
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Affiliation(s)
- Hao Huang
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; or
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
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7
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Wang S, Roy JP, Tomlinson AJ, Wang EB, Tsai YH, Cameron L, Underwood J, Spence JR, Walton KD, Stacker SA, Gumucio DL, Lechler T. RYK-mediated filopodial pathfinding facilitates midgut elongation. Development 2020; 147:dev195388. [PMID: 32994164 PMCID: PMC7648600 DOI: 10.1242/dev.195388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 09/15/2020] [Indexed: 12/11/2022]
Abstract
Between embryonic days 10.5 and 14.5, active proliferation drives rapid elongation of the murine midgut epithelial tube. Within this pseudostratified epithelium, nuclei synthesize DNA near the basal surface and move apically to divide. After mitosis, the majority of daughter cells extend a long, basally oriented filopodial protrusion, building a de novo path along which their nuclei can return to the basal side. WNT5A, which is secreted by surrounding mesenchymal cells, acts as a guidance cue to orchestrate this epithelial pathfinding behavior, but how this signal is received by epithelial cells is unknown. Here, we have investigated two known WNT5A receptors: ROR2 and RYK. We found that epithelial ROR2 is dispensable for midgut elongation. However, loss of Ryk phenocopies the Wnt5a-/- phenotype, perturbing post-mitotic pathfinding and leading to apoptosis. These studies reveal that the ligand-receptor pair WNT5A-RYK acts as a navigation system to instruct filopodial pathfinding, a process that is crucial for continuous cell cycling to fuel rapid midgut elongation.
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Affiliation(s)
- Sha Wang
- Department of Dermatology and Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - James P Roy
- Tumour Angiogenesis and Microenvironment Program, Peter MacCallum Cancer Centre, Melbourne, Victoria 3000, Australia
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria 3000, Australia
| | - Abigail J Tomlinson
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Ellen B Wang
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Yu-Hwai Tsai
- Department of Internal Medicine - Gastroenterology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Lisa Cameron
- Light Microscopy Core Facility, Duke University, Durham, NC 27708, USA
| | - Julie Underwood
- Department of Dermatology and Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Jason R Spence
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
- Department of Internal Medicine - Gastroenterology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, University of Michigan College of Engineering, Ann Arbor, MI 48109, USA
| | - Katherine D Walton
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Steven A Stacker
- Tumour Angiogenesis and Microenvironment Program, Peter MacCallum Cancer Centre, Melbourne, Victoria 3000, Australia
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria 3000, Australia
- Department of Surgery, Royal Melbourne Hospital, The University of Melbourne, Parkville, Victoria 3000, Australia
| | - Deborah L Gumucio
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Terry Lechler
- Department of Dermatology and Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA
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8
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Kerekes K, Bányai L, Trexler M, Patthy L. Structure, function and disease relevance of Wnt inhibitory factor 1, a secreted protein controlling the Wnt and hedgehog pathways. Growth Factors 2019; 37:29-52. [PMID: 31210071 DOI: 10.1080/08977194.2019.1626380] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Wnts and Hedgehogs (Hh) are large, lipid-modified extracellular morphogens that play key roles in embryonic development and stem cell proliferation of Metazoa. Both morphogens signal through heptahelical Frizzled-type receptors of the G-Protein Coupled Receptor family and there are several other similarities that suggest a common evolutionary origin of the Hh and Wnt pathways. There is evidence that the secreted protein, Wnt inhibitory factor 1 (WIF1) modulates the activity of both Wnts and Hhs and may thus contribute to the intertwining of these pathways. In this article, we review the structure, evolution, molecular interactions and functions of WIF1 with major emphasis on its role in carcinogenesis.
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Affiliation(s)
- Krisztina Kerekes
- a Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences , Budapest , Hungary
| | - László Bányai
- a Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences , Budapest , Hungary
| | - Mária Trexler
- a Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences , Budapest , Hungary
| | - László Patthy
- a Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences , Budapest , Hungary
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9
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Karvonen H, Perttilä R, Niininen W, Barker H, Ungureanu D. Targeting Wnt signaling pseudokinases in hematological cancers. Eur J Haematol 2018; 101:457-465. [DOI: 10.1111/ejh.13137] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 07/05/2018] [Indexed: 12/31/2022]
Affiliation(s)
- Hanna Karvonen
- BioMediTech Institute; University of Tampere; Tampere Finland
- Faculty of Medicine and Life Sciences; University of Tampere; Tampere Finland
| | - Robert Perttilä
- BioMediTech Institute; University of Tampere; Tampere Finland
- Faculty of Medicine and Life Sciences; University of Tampere; Tampere Finland
| | - Wilhelmiina Niininen
- BioMediTech Institute; University of Tampere; Tampere Finland
- Faculty of Medicine and Life Sciences; University of Tampere; Tampere Finland
| | - Harlan Barker
- Faculty of Medicine and Life Sciences; University of Tampere; Tampere Finland
| | - Daniela Ungureanu
- BioMediTech Institute; University of Tampere; Tampere Finland
- Faculty of Medicine and Life Sciences; University of Tampere; Tampere Finland
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10
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Kugathasan K, Halford MM, Farlie PG, Bates D, Smith DP, Zhang YF, Roy JP, Macheda ML, Zhang D, Wilkinson JL, Kirby ML, Newgreen DF, Stacker SA. Deficiency of the Wnt receptor Ryk causes multiple cardiac and outflow tract defects. Growth Factors 2018; 36:58-68. [PMID: 30035654 DOI: 10.1080/08977194.2018.1491848] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Ryk is a member of the receptor tyrosine kinase (RTK) family of proteins that control and regulate cellular processes. It is distinguished by binding Wnt ligands and having no detectable intrinsic protein tyrosine kinase activity suggesting Ryk is a pseudokinase. Here, we show an essential role for Ryk in directing morphogenetic events required for normal cardiac development through the examination of Ryk-deficient mice. We employed vascular corrosion casting, vascular perfusion with contrast dye, and immunohistochemistry to characterize cardiovascular and pharyngeal defects in Ryk-/- embryos. Ryk-/- mice exhibit a variety of malformations of the heart and outflow tract that resemble human congenital heart defects. This included stenosis and interruption of the aortic arch, ventriculoarterial malalignment, ventricular septal defects and abnormal pharyngeal arch artery remodelling. This study therefore defines a key intersection between a subset of growth factor receptors involved in planar cell polarity signalling, the Wnt family and mammalian cardiovascular development.
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Affiliation(s)
- Kumudhini Kugathasan
- a Ludwig Institute for Cancer Research , Royal Melbourne Hospital , Melbourne , Australia
- b Department of Surgery, Royal Melbourne Hospital , University of Melbourne , Parkville , Australia
| | - Michael M Halford
- a Ludwig Institute for Cancer Research , Royal Melbourne Hospital , Melbourne , Australia
- c Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
| | - Peter G Farlie
- d Craniofacial Development Laboratory , Murdoch Children's Research Institute , Parkville , Australia
| | - Damien Bates
- e Embryology Research Group , Murdoch Children's Research Institute , Parkville , Australia
| | - Darrin P Smith
- a Ludwig Institute for Cancer Research , Royal Melbourne Hospital , Melbourne , Australia
| | - You Fang Zhang
- a Ludwig Institute for Cancer Research , Royal Melbourne Hospital , Melbourne , Australia
- c Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
| | - James P Roy
- c Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
- f Sir Peter MacCallum Department of Oncology , University of Melbourne , Parkville , Australia
| | - Maria L Macheda
- a Ludwig Institute for Cancer Research , Royal Melbourne Hospital , Melbourne , Australia
- c Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
| | - Dong Zhang
- e Embryology Research Group , Murdoch Children's Research Institute , Parkville , Australia
| | - James L Wilkinson
- e Embryology Research Group , Murdoch Children's Research Institute , Parkville , Australia
| | - Margaret L Kirby
- g The Neonatal Perinatal Research Institute, Division of Neonatology , Duke University Medical Center , Durham , NC , USA
| | - Donald F Newgreen
- e Embryology Research Group , Murdoch Children's Research Institute , Parkville , Australia
| | - Steven A Stacker
- a Ludwig Institute for Cancer Research , Royal Melbourne Hospital , Melbourne , Australia
- b Department of Surgery, Royal Melbourne Hospital , University of Melbourne , Parkville , Australia
- c Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
- f Sir Peter MacCallum Department of Oncology , University of Melbourne , Parkville , Australia
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11
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Roy JP, Halford MM, Stacker SA. The biochemistry, signalling and disease relevance of RYK and other WNT-binding receptor tyrosine kinases. Growth Factors 2018; 36:15-40. [PMID: 29806777 DOI: 10.1080/08977194.2018.1472089] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The receptor tyrosine kinases (RTKs) are a well-characterized family of growth factor receptors that have central roles in human disease and are frequently therapeutically targeted. The RYK, ROR, PTK7 and MuSK subfamilies make up an understudied subset of WNT-binding RTKs. Numerous developmental, stem cell and pathological roles of WNTs, in particular WNT5A, involve signalling via these WNT receptors. The WNT-binding RTKs have highly context-dependent signalling outputs and stimulate the β-catenin-dependent, planar cell polarity and/or WNT/Ca2+ pathways. RYK, ROR and PTK7 members have a pseudokinase domain in their intracellular regions. Alternative signalling mechanisms, including proteolytic cleavage and protein scaffolding functions, have been identified for these receptors. This review explores the structure, signalling, physiological and pathological roles of RYK, with particular attention paid to cancer and the possibility of therapeutically targeting RYK. The other WNT-binding RTKs are compared with RYK throughout to highlight the similarities and differences within this subset of WNT receptors.
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Affiliation(s)
- James P Roy
- a Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
- b Sir Peter MacCallum Department of Oncology , The University of Melbourne , Parkville , Australia
| | - Michael M Halford
- a Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
| | - Steven A Stacker
- a Tumour Angiogenesis and Microenvironment Program , Peter MacCallum Cancer Centre , Melbourne , Australia
- b Sir Peter MacCallum Department of Oncology , The University of Melbourne , Parkville , Australia
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12
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Duan X, Gao Y, Liu Y. Ryk regulates Wnt5a repulsion of mouse corticospinal tract through modulating planar cell polarity signaling. Cell Discov 2017; 3:17015. [PMID: 28660073 PMCID: PMC5475318 DOI: 10.1038/celldisc.2017.15] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 03/22/2017] [Indexed: 11/21/2022] Open
Abstract
It was previously reported a role for Ryk in mediating Wnt5a repulsion of the corticospinal tract (CST) in mice. Recent evidence has shown that Ryk regulates planar cell polarity (PCP) signaling through interacting with Vangl2. Here, in vivo, in vitro and biochemical analyses were applied to investigate the molecular cross-talk between the Ryk and PCP signaling pathways, revealing that PCP pathway components play important roles in CST anterior–posterior guidance. Ryk–Vangl2 interactions are crucial for PCP signaling to mediate Wnt5a repulsion of CST axons. Cytoplasmic distribution of Ryk is increased under high concentrations of Wnt5a and facilitates the cytoplasmic distribution of Vangl2, leading to inhibition of Frizzled3 translocation to cytoplasm. Alternatively, Ryk stabilizes Vangl2 in the plasma membrane under low Wnt5a concentrations, which promotes cytoplasmic translocation of Frizzled3. We propose that Ryk regulates PCP signaling through asymmetric modulation of Vangl2 distribution in the cytoplasm and plasma membrane, which leads to repulsion of CST axons in response to the Wnt gradient.
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Affiliation(s)
- Xin Duan
- Institute of Neuroscience, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Soochow University, Suzhou, China
| | - Yarong Gao
- Institute of Neuroscience, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Soochow University, Suzhou, China
| | - Yaobo Liu
- Institute of Neuroscience, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Soochow University, Suzhou, China
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Oliva C, Hassan BA. Receptor Tyrosine Kinases and Phosphatases in Neuronal Wiring: Insights From Drosophila. Curr Top Dev Biol 2016; 123:399-432. [PMID: 28236973 DOI: 10.1016/bs.ctdb.2016.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Tyrosine phosphorylation is at the crossroads of many signaling pathways. Brain wiring is not an exception, and several receptor tyrosine kinases (RTKs) and tyrosine receptor phosphates (RPTPs) have been involved in this process. Considerable work has been done on RTKs, and for many of them, detailed molecular mechanisms and functions in several systems have been characterized. In contrast, RPTPs have been studied considerably less and little is known about their ligands and substrates. In both families, we find redundancy between different members to accomplish particular wiring patterns. Strikingly, some RTKs and RPTPs have lost their catalytic activity during evolution, but not their importance in biological processes. In this regard, we have to keep in mind that these proteins have multiple domains and some of their functions are independent of tyrosine phosphorylation/dephosphorylation. Since RTKs and RPTPs are enzymes involved not only in early stages of axon and dendrite pathfinding but also in synapse formation and physiology, they have a potential as drug targets. Drosophila has been a key model organism in the search of a better understanding of brain wiring, and its sophisticated toolbox is very suitable for studying the function of genes with pleiotropic functions such as RTKs and RPTPs, from wiring to synaptic formation and function. In these review, we mainly cover findings from this model organism and complement them with discoveries in vertebrate systems.
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Affiliation(s)
- Carlos Oliva
- Biomedical Neuroscience Institute, Faculty of Medicine, Universidad of Chile, Santiago, Chile.
| | - Bassem A Hassan
- Sorbonne Universités, UPMC Univ Paris 06, Inserm, CNRS, AP-HP, Institut du Cerveau et la Moelle (ICM)-Hôpital Pitié-Salpêtrière, Boulevard de l'Hôpital, Paris, France.
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14
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The non-canonical Wnt receptor Ryk regulates hematopoietic stem cell repopulation in part by controlling proliferation and apoptosis. Cell Death Dis 2016; 7:e2479. [PMID: 27882948 PMCID: PMC5260899 DOI: 10.1038/cddis.2016.380] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 10/17/2016] [Accepted: 10/18/2016] [Indexed: 12/27/2022]
Abstract
The development of blood and immune cells requires strict control by various signaling pathways in order to regulate self-renewal, differentiation and apoptosis in stem and progenitor cells. Recent evidence indicates critical roles for the canonical and non-canonical Wnt pathways in hematopoiesis. The non-canonical Wnt pathway is important for establishment of cell polarity and cell migration and regulates apoptosis in the thymus. We here investigate the role of the non-canonical Wnt receptor Ryk in hematopoiesis and lymphoid development. We show that there are dynamic changes in Ryk expression during development and in different hematopoietic tissues. Functionally, Ryk regulates NK cell development in a temporal fashion. Moreover, Ryk-deficient mice show diminished, but not absent self-renewal of hematopoietic stem cells (HSC), via effects on mildly increased proliferation and apoptosis. Thus, Ryk deficiency in HSCs from fetal liver reduces their quiescence, leading to proliferation-induced apoptosis and decreased self-renewal.
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15
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Trump BF. Mechanisms of Toxicity and Carcinogenesis. Toxicol Pathol 2016. [DOI: 10.1177/019262339502300616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Alvarez-Zavala M, Riveros-Magaña AR, García-Castro B, Barrera-Chairez E, Rubio-Jurado B, Garcés-Ruíz OM, Ramos-Solano M, Aguilar-Lemarroy A, Jave-Suarez LF. WNT receptors profile expression in mature blood cells and immature leukemic cells: RYK emerges as a hallmark receptor of acute leukemia. Eur J Haematol 2015; 97:155-65. [DOI: 10.1111/ejh.12698] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/03/2015] [Indexed: 02/03/2023]
Affiliation(s)
- Monserrat Alvarez-Zavala
- División de Inmunología; Centro de Investigación Biomédica de Occidente (CIBO); Instituto Mexicano del Seguro Social (IMSS); Guadalajara Jalisco Mexico
- Programa de Doctorado en Ciencias Biomédicas; Centro Universitario de Ciencias de la Salud (CUCS); Universidad de Guadalajara; Guadalajara Jalisco Mexico
| | - Alma R. Riveros-Magaña
- División de Inmunología; Centro de Investigación Biomédica de Occidente (CIBO); Instituto Mexicano del Seguro Social (IMSS); Guadalajara Jalisco Mexico
- Programa de Doctorado en Investigación Clínica; CUCS; Universidad de Guadalajara; Guadalajara Jalisco Mexico
| | - Beatriz García-Castro
- División de Inmunología; Centro de Investigación Biomédica de Occidente (CIBO); Instituto Mexicano del Seguro Social (IMSS); Guadalajara Jalisco Mexico
- Tecnologico de Monterrey; Campus Sinaloa; Guadalajara Jalisco Mexico
| | | | - Benjamin Rubio-Jurado
- Servicio de Hematología UMAE; Hospital de Especialidades; Centro Médico Nacional de Occidente (CMNO)-IMSS; Guadalajara Jalisco Mexico
| | - Oscar M. Garcés-Ruíz
- Servicio de Hematología UMAE; Hospital de Especialidades; Centro Médico Nacional de Occidente (CMNO)-IMSS; Guadalajara Jalisco Mexico
| | - Moisés Ramos-Solano
- División de Inmunología; Centro de Investigación Biomédica de Occidente (CIBO); Instituto Mexicano del Seguro Social (IMSS); Guadalajara Jalisco Mexico
| | - Adriana Aguilar-Lemarroy
- División de Inmunología; Centro de Investigación Biomédica de Occidente (CIBO); Instituto Mexicano del Seguro Social (IMSS); Guadalajara Jalisco Mexico
| | - Luis F. Jave-Suarez
- División de Inmunología; Centro de Investigación Biomédica de Occidente (CIBO); Instituto Mexicano del Seguro Social (IMSS); Guadalajara Jalisco Mexico
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17
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Hamilton G, Rath B, Klameth L, Hochmair M. Receptor tyrosine kinase expression of circulating tumor cells in small cell lung cancer. Oncoscience 2015; 2:629-34. [PMID: 26328272 PMCID: PMC4549360 DOI: 10.18632/oncoscience.179] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 07/25/2015] [Indexed: 01/22/2023] Open
Abstract
Small cell lung cancer (SCLC) has a poor prognosis and is found disseminated at first presentation in the majority of cases. The cell biological mechanisms underlying metastasis and drug resistance are not clear. SCLC is characterized by high numbers of circulating tumor cells (CTCs) and we were able to expand several CTC lines ex vivo and to relate chitinase-3-like-1/YKL-40 (CHI3L1) as marker. Availability of expanded SCLC CTC cells allowed for a screening of receptor tyrosine kinases (RTKs) expressed. The metastatic CHI3L1-negative SCLC cell line SCLC26A, established from a pleural effusion was used for comparison. The CTC cell line BHGc10 was found to exhibit increased expression of RYK, AXL, Tie-1, Dtk, ROR1/2, several ephrins (Eph) and FGF/EGF receptors compared to SCLC26A. All of these RTKs have been associated with cell motility, invasion and poor prognosis in diverse cancer entities without knowledge of their association with CTCs. The identification of RYK, AXL and ROR1/2 as pseudokinases, lacking activity, seems to be related to the observed failure of RTK inhibitors in SCLC. These kinases are involved in the noncanonical WNT pathway and their expression in SCLC CTCs represents a cancer stem cell-like phenotype.
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Affiliation(s)
- Gerhard Hamilton
- Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
| | - Barbara Rath
- Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
| | - Lukas Klameth
- Ludwig Boltzmann Cluster of Translational Oncology, Vienna, Austria
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18
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Rao KS, Aronshtam A, McElory-Yaggy KL, Bakondi B, VanBuren P, Sobel BE, Spees JL. Human epicardial cell-conditioned medium contains HGF/IgG complexes that phosphorylate RYK and protect against vascular injury. Cardiovasc Res 2015; 107:277-86. [PMID: 26025956 DOI: 10.1093/cvr/cvv168] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 05/21/2015] [Indexed: 11/13/2022] Open
Abstract
AIMS The aim of this study was to evaluate the paracrine activity of human epicardial-derived cells (hEPDCs) to screen for secreted vasoprotective factors and develop therapeutics to treat vascular reperfusion injury. METHODS AND RESULTS Epicardial cells support cardiac development, repair, and remodelling after injury in part, through paracrine activity. We hypothesized that secreted ligands from hEPDCs would protect vascular integrity after myocardial infarction (MI) with reperfusion. During simulated ischaemia in culture (24-48 h), concentrated hEPDC-conditioned medium (EPI CdM) increased survival of primary cardiac endothelial cells. In a rat MI model, EPI CdM treatment reduced vascular injury in vivo after reperfusion. By phospho-receptor tyrosine kinase (RTK) arrays, ELISA, and neutralizing antibody screens, we identified hepatocyte growth factor (HGF) as a key vasoprotective factor in EPI CdM. Unexpectedly, we observed that some of the HGF in EPI CdM formed complexes with polyclonal IgG. Following reperfusion, preparations of HGF/IgG complexes provided greater vascular protection than free HGF with IgG. HGF/IgG complexes localized to blood vessels in vivo and increased HGF retention time after administration. In subsequent screens, we found that 'related to tyrosine kinase' (RYK) receptor was phosphorylated after exposure of cardiac endothelial cells to HGF/IgG complexes, but not to free HGF with IgG. The enhanced protection conferred by HGF/IgG complexes was lost after antibody blockade of RYK. Notably, the HGF/IgG complex is the first 'ligand' shown to promote phosphorylation of RYK. CONCLUSION Early treatment with HGF/IgG complexes after myocardial ischaemia with reperfusion may rescue tissue through vasoprotection conferred by c-Met and RYK signalling.
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Affiliation(s)
- Krithika S Rao
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Colchester, VT, USA Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA
| | - Alexander Aronshtam
- Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA
| | - Keara L McElory-Yaggy
- Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA
| | - Benjamin Bakondi
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Colchester, VT, USA Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA
| | - Peter VanBuren
- Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA
| | - Burton E Sobel
- Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA
| | - Jeffrey L Spees
- Department of Medicine and Cardiovascular Research Institute, University of Vermont, 208 South Park Drive, Ste 2, Colchester, VT 05446, USA Stem Cell Core, University of Vermont, Colchester, VT 05446, USA
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19
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Borcherding N, Kusner D, Kolb R, Xie Q, Li W, Yuan F, Velez G, Askeland R, Weigel RJ, Zhang W. Paracrine WNT5A Signaling Inhibits Expansion of Tumor-Initiating Cells. Cancer Res 2015; 75:1972-82. [PMID: 25769722 DOI: 10.1158/0008-5472.can-14-2761] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 03/09/2015] [Indexed: 12/21/2022]
Abstract
It is not well understood how paracrine communication between basal and luminal cell populations in the mammary gland affects tumorigenesis. During ErbB2-induced mammary tumorigenesis, enriched mammary stem cells that represent a subpopulation of basal cells exhibit enhanced tumorigenic capacity compared with the corresponding luminal progenitors. Transcript profiling of tumors derived from basal and luminal tumor-initiating cells (TIC) revealed preferential loss of the noncanonical Wnt ligand WNT5A in basal TIC-derived tumors. Heterozygous loss of WNT5A was correlated with shorter survival of breast cancer patients. In a mouse model of ErbB2-induced breast cancer, Wnt5a heterozygosity promoted tumor multiplicity and pulmonary metastasis. As a TGFβ substrate, luminal cell-produced WNT5A induced a feed-forward loop to activate SMAD2 in a RYK and TGFβR1-dependent manner to limit the expansion of basal TIC in a paracrine fashion, a potential explanation for the suppressive effect of WNT5A in mammary tumorigenesis. Our results identify the WNT5A/RYK module as a spatial regulator of the TGFβ-SMAD signaling pathway in the context of mammary gland development and carcinogenesis, offering a new perspective on tumor suppression provided by basal-luminal cross-talk in normal mammary tissue.
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Affiliation(s)
- Nicholas Borcherding
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa. Medical Science Training Program, University of Iowa, College of Medicine, Iowa City, Iowa
| | - David Kusner
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa. Molecular and Cellular Biology Program, University of Iowa, College of Medicine, Iowa City, Iowa
| | - Ryan Kolb
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa. Immunology Program, University of Iowa, College of Medicine, Iowa City, Iowa
| | - Qing Xie
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, P.R. China
| | - Wei Li
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa
| | - Fang Yuan
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa. Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, P.R. China
| | - Gabriel Velez
- Medical Science Training Program, University of Iowa, College of Medicine, Iowa City, Iowa
| | - Ryan Askeland
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa
| | - Ronald J Weigel
- Department of Surgery, University of Iowa, College of Medicine, Iowa City, Iowa. Holden Comprehensive Cancer Center, University of Iowa, College of Medicine, Iowa City, Iowa
| | - Weizhou Zhang
- Department of Pathology, University of Iowa, College of Medicine, Iowa City, Iowa. Medical Science Training Program, University of Iowa, College of Medicine, Iowa City, Iowa. Molecular and Cellular Biology Program, University of Iowa, College of Medicine, Iowa City, Iowa. Immunology Program, University of Iowa, College of Medicine, Iowa City, Iowa. Holden Comprehensive Cancer Center, University of Iowa, College of Medicine, Iowa City, Iowa.
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20
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Roux F, Noël L, Rivas S, Roby D. ZRK atypical kinases: emerging signaling components of plant immunity. THE NEW PHYTOLOGIST 2014; 203:713-716. [PMID: 24841753 DOI: 10.1111/nph.12841] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Affiliation(s)
- Fabrice Roux
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326, Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326, Castanet-Tolosan, France
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21
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Poh WC, Shen Y, Inoue T. Function of the Ryk intracellular domain in C. elegans vulval development. Dev Dyn 2014; 243:1074-85. [PMID: 24975394 DOI: 10.1002/dvdy.24159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 05/05/2014] [Accepted: 06/01/2014] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Ryk is a subfamily of receptor tyrosine kinases, which along with Frizzled and Ror, function as Wnt receptors. Vertebrate Ryk intracellular domain (ICD) is released from the cell membrane by a proteolytic cleavage in the transmembrane region and localizes to the nucleus. In C. elegans, Ryk is encoded by the lin-18 gene and regulates the polarity of the P7.p vulval cell. RESULTS Based on Western blots, we were unable to detect the presence of the cleaved LIN-18 ICD fragment. Functional assays found that LIN-18 intracellular domain is not absolutely required for LIN-18 function, consistent with previous results. However, overexpression of the LIN-18 intracellular domain fragment (LIN-18ICD) weakly enhanced the phenotype of lin-18 loss-of-function mutants. Furthermore, this activity was specific to the serine-rich juxtamembrane region. We also found that the nuclear localization of LIN-18ICD fragment can be regulated by Wnt pathway components including CAM-1/Ror, and by PAR-5/14-3-3. CONCLUSIONS Release of LIN-18ICD by cleavage at the membrane is not the main mechanism of LIN-18 signaling in vulval cells. However, our results suggest that LIN-18 intracellular domain interacts with Wnt pathway components and a 14-3-3 protein and likely plays a minor role in LIN-18 signaling.
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Affiliation(s)
- Woon Cheng Poh
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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22
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Koopmans T, Anaparti V, Castro-Piedras I, Yarova P, Irechukwu N, Nelson C, Perez-Zoghbi J, Tan X, Ward JPT, Wright DB. Ca2+ handling and sensitivity in airway smooth muscle: emerging concepts for mechanistic understanding and therapeutic targeting. Pulm Pharmacol Ther 2014; 29:108-20. [PMID: 24831539 DOI: 10.1016/j.pupt.2014.05.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 03/28/2014] [Accepted: 05/01/2014] [Indexed: 02/01/2023]
Abstract
Free calcium ions within the cytosol serve as a key secondary messenger system for a diverse range of cellular processes. Dysregulation of cytosolic Ca(2+) handling in airway smooth muscle (ASM) has been implicated in asthma, and it has been hypothesised that this leads, at least in part, to associated changes in both the architecture and function of the lung. Significant research is therefore directed towards furthering our understanding of the mechanisms which control ASM cytosolic calcium, in addition to those regulating the sensitivity of its downstream effector targets to calcium. Key aspects of the recent developments in this field were discussed at the 8th Young Investigators' Symposium on Smooth Muscle (2013, Groningen, The Netherlands), and are outlined in this review.
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Affiliation(s)
- T Koopmans
- Department of Molecular Pharmacology, University of Groningen, Groningen, The Netherlands
| | - V Anaparti
- Department of Immunology, University of Manitoba, Winnipeg, Canada
| | - I Castro-Piedras
- Cell Physiology and Molecular Biophysics, Texas Tech University Health Sciences Center, TX, USA
| | - P Yarova
- Cardiff School of Biosciences, Cardiff University, UK
| | - N Irechukwu
- Division of Asthma, Allergy and Lung Biology, King's College London, UK
| | - C Nelson
- School of Science & Technology, Nottingham Trent University, Nottingham, UK
| | - J Perez-Zoghbi
- Cell Physiology and Molecular Biophysics, Texas Tech University Health Sciences Center, TX, USA
| | - X Tan
- Lung Inflammation & Infection Lab, QIMR Berghofer Medical Research Institute, Herston, Queensland, Australia
| | - J P T Ward
- Division of Asthma, Allergy and Lung Biology, King's College London, UK
| | - D B Wright
- Department of Molecular Pharmacology, University of Groningen, Groningen, The Netherlands; Division of Asthma, Allergy and Lung Biology, King's College London, UK.
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23
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Clark CEJ, Liu Y, Cooper HM. The Yin and Yang of Wnt/Ryk axon guidance in development and regeneration. SCIENCE CHINA-LIFE SCIENCES 2014; 57:366-71. [DOI: 10.1007/s11427-014-4640-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 02/24/2014] [Indexed: 11/28/2022]
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A robust methodology to subclassify pseudokinases based on their nucleotide-binding properties. Biochem J 2014; 457:323-34. [PMID: 24107129 DOI: 10.1042/bj20131174] [Citation(s) in RCA: 216] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Protein kinase-like domains that lack conserved residues known to catalyse phosphoryl transfer, termed pseudokinases, have emerged as important signalling domains across all kingdoms of life. Although predicted to function principally as catalysis-independent protein-interaction modules, several pseudokinase domains have been attributed unexpected catalytic functions, often amid controversy. We established a thermal-shift assay as a benchmark technique to define the nucleotide-binding properties of kinase-like domains. Unlike in vitro kinase assays, this assay is insensitive to the presence of minor quantities of contaminating kinases that may otherwise lead to incorrect attribution of catalytic functions to pseudokinases. We demonstrated the utility of this method by classifying 31 diverse pseudokinase domains into four groups: devoid of detectable nucleotide or cation binding; cation-independent nucleotide binding; cation binding; and nucleotide binding enhanced by cations. Whereas nine pseudokinases bound ATP in a divalent cation-dependent manner, over half of those examined did not detectably bind nucleotides, illustrating that pseudokinase domains predominantly function as non-catalytic protein-interaction modules within signalling networks and that only a small subset is potentially catalytically active. We propose that henceforth the thermal-shift assay be adopted as the standard technique for establishing the nucleotide-binding and catalytic potential of kinase-like domains.
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25
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Homodimerization of the Wnt receptor DERAILED recruits the Src family kinase SRC64B. Mol Cell Biol 2013; 33:4116-27. [PMID: 23979591 DOI: 10.1128/mcb.00169-13] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Ryk pseudokinase receptors act as important transducers of Wnt signals, particularly in the nervous system. Little is known, however, of their interactions at the cell surface. Here, we show that a Drosophila Ryk family member, DERAILED (DRL), forms cell surface homodimers and can also heterodimerize with the two other fly Ryks, DERAILED-2 and DOUGHNUT ON 2. DERAILED homodimerization levels increase significantly in the presence of its ligand, WNT5. In addition, DERAILED displays ligand-independent dimerization mediated by a motif in its transmembrane domain. Increased dimerization of DRL upon WNT5 binding or upon the replacement of DERAILED's extracellular domain with the immunoglobulin Fc domain results in an increased recruitment of the Src family kinase SRC64B, a previously identified downstream pathway effector. Formation of the SRC64B/DERAILED complex requires SRC64B's SH2 domain and DERAILED's PDZ-binding motif. Mutations in DERAILED's inactive tyrosine kinase-homologous domain also disrupt the formation of DERAILED/SRC64B complexes, indicating that its conformation is likely important in facilitating its interaction with SRC64B. Finally, we show that DERAILED's function during embryonic axon guidance requires its Wnt-binding domain, a putative juxtamembrane extracellular tetrabasic cleavage site, and the PDZ-binding domain, indicating that DERAILED's activation involves a complex set of events including both dimerization and proteolytic processing.
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26
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Andre P, Wang Q, Wang N, Gao B, Schilit A, Halford MM, Stacker SA, Zhang X, Yang Y. The Wnt coreceptor Ryk regulates Wnt/planar cell polarity by modulating the degradation of the core planar cell polarity component Vangl2. J Biol Chem 2012; 287:44518-25. [PMID: 23144463 DOI: 10.1074/jbc.m112.414441] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The Wnt signaling pathways control many critical developmental and adult physiological processes. In vertebrates, one fundamentally important function of Wnts is to provide directional information by regulating the evolutionarily conserved planar cell polarity (PCP) pathway during embryonic morphogenesis. However, despite the critical roles of Wnts and PCP in vertebrate development and disease, little is known about the molecular mechanisms underlying Wnt regulation of PCP. Here, we have found that the receptor-like tyrosine kinase (Ryk), a Wnt5a-binding protein required in axon guidance, regulates PCP signaling. We show that Ryk interacts with Vangl2 genetically and biochemically, and such interaction is potentiated by Wnt5a. Loss of Ryk in a Vangl2(+/-) background results in classic PCP defects, including open neural tube, misalignment of sensory hair cells in the inner ear, and shortened long bones in the limbs. Complete loss of both Ryk and Vangl2 results in more severe phenotypes that resemble the Wnt5a(-/-) mutant in many aspects such as shortened anterior-posterior body axis, limb, and frontonasal process. Our data identify the Wnt5a-binding protein Ryk as a general regulator of the mammalian Wnt/PCP signaling pathway. We show that Ryk transduces Wnt5a signaling by forming a complex with Vangl2 and that Ryk regulates PCP by at least in part promoting Vangl2 stability. As human mutations in WNT5A and VANGL2 are found to cause Robinow syndrome and neural tube defects, respectively, our results further suggest that human mutations in RYK may also be involved in these diseases.
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Affiliation(s)
- Philipp Andre
- Genetic Disease Research Branch, National Human Genome Research Institute, Bethesda, Maryland 20892, USA
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27
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Mulligan KA, Cheyette BNR. Wnt signaling in vertebrate neural development and function. J Neuroimmune Pharmacol 2012; 7:774-87. [PMID: 23015196 DOI: 10.1007/s11481-012-9404-x] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 09/10/2012] [Indexed: 02/03/2023]
Abstract
Members of the Wnt family of secreted signaling proteins influence many aspects of neural development and function. Wnts are required from neural induction and axis formation to axon guidance and synapse development, and even help modulate synapse activity. Wnt proteins activate a variety of downstream signaling pathways and can induce a similar variety of cellular responses, including gene transcription changes and cytoskeletal rearrangements. This review provides an introduction to Wnt signaling pathways and discusses current research on their roles in vertebrate neural development and function.
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Affiliation(s)
- Kimberly A Mulligan
- Department of Psychiatry, University of California, San Francisco, San Francisco, CA 94158, USA
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Ueno K, Hirata H, Hinoda Y, Dahiya R. Frizzled homolog proteins, microRNAs and Wnt signaling in cancer. Int J Cancer 2012; 132:1731-40. [PMID: 22833265 DOI: 10.1002/ijc.27746] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 07/10/2012] [Indexed: 01/12/2023]
Abstract
Wnt signaling pathways play important roles in tumorigenesis and are initiated by binding of Wnt to various receptors including frizzleds (FZDs). FZDs are one of several families of receptors comprised of FZD/LRP/ROR2/RYK in the Wnt signaling pathway. Expression of some FZD receptors are up regulated, thereby activating the Wnt signaling pathway and is correlated with cancer malignancy and patient outcomes (recurrence and survival) in many cancers. The FZD family contains ten genes in humans and their function has not been completely examined including the regulatory mechanisms of FZD genes in cancer. Knockdown of FZDs may suppress the Wnt signaling pathway resulting in decreased cell growth, invasion, motility and metastasis of cancer cells. Recently a number of microRNAs (miRNAs) have been identified and reported to be important in several cancers. MiRNAs regulate target gene expression at both the transcription and translation levels. The study of miRNA is a newly emerging field and promises to be helpful in understanding the pathogenesis of FZDs in cancer. In addition, miRNAs may be useful in regulating FZDs in cancer cells. Therefore, the aim of this review is to discuss current knowledge of the functional mechanisms of FZDs in cancer, including regulation by miRNAs and the potential for possible use of miRNAs and FZDs in future clinical applications.
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Affiliation(s)
- Koji Ueno
- Department of Urology, San Francisco Veterans Affairs Medical Center and University of California at San Francisco, San Francisco, CA 94121, USA
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29
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Macheda ML, Sun WW, Kugathasan K, Hogan BM, Bower NI, Halford MM, Zhang YF, Jacques BE, Lieschke GJ, Dabdoub A, Stacker SA. The Wnt receptor Ryk plays a role in mammalian planar cell polarity signaling. J Biol Chem 2012; 287:29312-23. [PMID: 22773843 DOI: 10.1074/jbc.m112.362681] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Wnts are essential for a wide range of developmental processes, including cell growth, division, and differentiation. Some of these processes signal via the planar cell polarity (PCP) pathway, which is a β-catenin-independent Wnt signaling pathway. Previous studies have shown that Ryk, a member of the receptor tyrosine kinase family, can bind to Wnts. Ryk is required for normal axon guidance and neuronal differentiation during development. Here, we demonstrate that mammalian Ryk interacts with the Wnt/PCP pathway. In vitro analysis showed that the Wnt inhibitory factor domain of Ryk was necessary for Wnt binding. Detailed analysis of two vertebrate model organisms showed Ryk phenotypes consistent with PCP signaling. In zebrafish, gene knockdown using morpholinos revealed a genetic interaction between Ryk and Wnt11 during the PCP pathway-regulated process of embryo convergent extension. Ryk-deficient mouse embryos displayed disrupted polarity of stereociliary hair cells in the cochlea, a characteristic of disturbed PCP signaling. This PCP defect was also observed in mouse embryos that were double heterozygotes for Ryk and Looptail (containing a mutation in the core Wnt/PCP pathway gene Vangl2) but not in either of the single heterozygotes, suggesting a genetic interaction between Ryk and Vangl2. Co-immunoprecipitation studies demonstrated that RYK and VANGL2 proteins form a complex, whereas RYK also activated RhoA, a downstream effector of PCP signaling. Overall, our data suggest an important role for Ryk in Wnt/planar cell polarity signaling during vertebrate development via the Vangl2 signaling pathway, as demonstrated in the mouse cochlea.
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Affiliation(s)
- Maria L Macheda
- Tumour Angiogenesis Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria 3002, Australia
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Clark CEJ, Nourse CC, Cooper HM. The tangled web of non-canonical Wnt signalling in neural migration. Neurosignals 2012; 20:202-20. [PMID: 22456117 DOI: 10.1159/000332153] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Accepted: 08/23/2011] [Indexed: 12/19/2022] Open
Abstract
In all multicellular animals, successful embryogenesis is dependent on the ability of cells to detect the status of the local environment and respond appropriately. The nature of the extracellular environment is communicated to the intracellular compartment by ligand/receptor interactions at the cell surface. The Wnt canonical and non-canonical signalling pathways are found in the most primitive metazoans, and they play an essential role in the most fundamental developmental processes in all multicellular organisms. Vertebrates have expanded the number of Wnts and Frizzled receptors and have additionally evolved novel Wnt receptor families (Ryk, Ror). The multiplicity of potential interactions between Wnts, their receptors and downstream effectors has exponentially increased the complexity of the signal transduction network. Signalling through each of the Wnt pathways, as well as crosstalk between them, plays a critical role in the establishment of the complex architecture of the vertebrate central nervous system. In this review, we explore the signalling networks triggered by non-canonical Wnt/receptor interactions, focussing on the emerging roles of the non-conventional Wnt receptors Ryk and Ror. We describe the role of these pathways in neural tube formation and axon guidance where Wnt signalling controls tissue polarity, coordinated cell migration and axon guidance via remodelling of the cytoskeleton.
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Affiliation(s)
- Charlotte E J Clark
- Queensland Brain Institute, University of Queensland, Brisbane, Qld, Australia
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31
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Lahaye LL, Wouda RR, de Jong AWM, Fradkin LG, Noordermeer JN. WNT5 interacts with the Ryk receptors doughnut and derailed to mediate muscle attachment site selection in Drosophila melanogaster. PLoS One 2012; 7:e32297. [PMID: 22403643 PMCID: PMC3293800 DOI: 10.1371/journal.pone.0032297] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Accepted: 01/24/2012] [Indexed: 01/12/2023] Open
Abstract
In recent years a number of the genes that regulate muscle formation and maintenance in higher organisms have been identified. Studies employing invertebrate and vertebrate model organisms have revealed that many of the genes required for early mesoderm specification are highly conserved throughout evolution. Less is known about the molecules that mediate the steps subsequent to myogenesis, e. g. myotube guidance and attachment to tendon cells. We use the stereotypic pattern of the Drosophila embryonic body wall musculature in genetic approaches to identify novel factors required for muscle attachment site selection. Here, we show that Wnt5 is needed in this process. The lateral transverse muscles frequently overshoot their target attachment sites and stably attach at novel epidermal sites in Wnt5 mutant embryos. Restoration of WNT5 expression in either the muscle or the tendon cell rescues the mutant phenotype. Surprisingly, the novel attachment sites in Wnt5 mutants frequently do not express the Stripe (SR) protein which has been shown to be required for terminal tendon cell differentiation. A muscle bypass phenotype was previously reported for embryos lacking the WNT5 receptor Derailed (DRL). drl and Wnt5 mutant embryos also exhibit axon path finding errors. DRL belongs to the conserved Ryk receptor tyrosine kinase family which includes two other Drosophila orthologs, the Doughnut on 2 (DNT) and Derailed-2 (DRL-2) proteins. We generated a mutant allele of dnt and find that dnt, but not Drl-2, mutant embryos also show a muscle bypass phenotype. Genetic interaction experiments indicate that drl and dnt act together, likely as WNT5 receptors, to control muscle attachment site selection. These results extend previous findings that at least some of the molecular pathways that guide axons towards their targets are also employed for guidance of muscle fibers to their appropriate attachment sites.
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Affiliation(s)
| | | | | | - Lee G. Fradkin
- Laboratory of Developmental Neurobiology, Department of Molecular and Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
- * E-mail: (JNN); (LGF)
| | - Jasprina N. Noordermeer
- Laboratory of Developmental Neurobiology, Department of Molecular and Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
- * E-mail: (JNN); (LGF)
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32
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Update on Wnt signaling in bone cell biology and bone disease. Gene 2011; 492:1-18. [PMID: 22079544 DOI: 10.1016/j.gene.2011.10.044] [Citation(s) in RCA: 288] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Revised: 10/13/2011] [Accepted: 10/20/2011] [Indexed: 12/17/2022]
Abstract
For more than a decade, Wnt signaling pathways have been the focus of intense research activity in bone biology laboratories because of their importance in skeletal development, bone mass maintenance, and therapeutic potential for regenerative medicine. It is evident that even subtle alterations in the intensity, amplitude, location, and duration of Wnt signaling pathways affects skeletal development, as well as bone remodeling, regeneration, and repair during a lifespan. Here we review recent advances and discrepancies in how Wnt/Lrp5 signaling regulates osteoblasts and osteocytes, introduce new players in Wnt signaling pathways that have important roles in bone development, discuss emerging areas such as the role of Wnt signaling in osteoclastogenesis, and summarize progress made in translating basic studies to clinical therapeutics and diagnostics centered around inhibiting Wnt pathway antagonists, such as sclerostin, Dkk1 and Sfrp1. Emphasis is placed on the plethora of genetic studies in mouse models and genome wide association studies that reveal the requirement for and crucial roles of Wnt pathway components during skeletal development and disease.
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Truitt L, Freywald A. Dancing with the dead: Eph receptors and their kinase-null partners. Biochem Cell Biol 2011; 89:115-29. [PMID: 21455264 DOI: 10.1139/o10-145] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Eph receptor tyrosine kinases and their ligands, ephrins, are membrane proteins coordinating a wide range of biological functions both in developing embryos and in adult multicellular organisms. Numerous studies have implicated Eph receptors in the induction of opposing responses, including cell adhesion or repulsion, support or inhibition of cell proliferation and cell migration, and progression or suppression of multiple malignancies. Similar to other receptor tyrosine kinases, Eph receptors rely on their ability to catalyze tyrosine phosphorylation for signal transduction. Interestingly, however, Eph receptors also actively utilize three kinase-deficient receptor tyrosine kinases, EphB6, EphA10, and Ryk, in their signaling network. The accumulating evidence suggests that the unusual flexibility of the Eph family, allowing it to initiate antagonistic responses, might be partially explained by the influence of the kinase-dead participants and that the exact outcome of an Eph-mediated action is likely to be defined by the balance between the signaling of catalytically potent and catalytically null receptors. We discuss in this minireview the emerging functions of the kinase-dead EphB6, EphA10, and Ryk receptors both in normal biological responses and in malignancy, and analyze currently available information related to the molecular mechanisms of their action in the context of the Eph family.
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Affiliation(s)
- Luke Truitt
- Department of Chemistry and Biochemistry, University of Regina, Sasketchewan, Canada
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Schulte G. International Union of Basic and Clinical Pharmacology. LXXX. The class Frizzled receptors. Pharmacol Rev 2011; 62:632-67. [PMID: 21079039 DOI: 10.1124/pr.110.002931] [Citation(s) in RCA: 160] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The receptor class Frizzled, which has recently been categorized as a separate group of G protein-coupled receptors by the International Union of Basic and Clinical Pharmacology, consists of 10 Frizzleds (FZD(1-10)) and Smoothened (SMO). The FZDs are activated by secreted lipoglycoproteins of the Wingless/Int-1 (WNT) family, whereas SMO is indirectly activated by the Hedgehog (HH) family of proteins acting on the transmembrane protein Patched (PTCH). Recent years have seen major advances in our knowledge about these seven-transmembrane-spanning proteins, including: receptor function, molecular mechanisms of signal transduction, and the receptor's role in embryonic patterning, physiology, cancer, and other diseases. Despite intense efforts, many question marks and challenges remain in mapping receptor-ligand interaction, signaling routes, mechanisms of specificity and how these molecular details underlie disease and also the receptor's important role in physiology. This review therefore focuses on the molecular aspects of WNT/FZD and HH/SMO signaling discussing receptor structure, mechanisms of signal transduction, accessory proteins, receptor dynamics, and the possibility of targeting these signaling pathways pharmacologically.
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Affiliation(s)
- Gunnar Schulte
- Section of Receptor Biology & Signaling, Dept. of Physiology & Pharmacology, Karolinska Institutet, Stockholm, Sweden.
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35
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Dishevelled: The hub of Wnt signaling. Cell Signal 2009; 22:717-27. [PMID: 20006983 DOI: 10.1016/j.cellsig.2009.11.021] [Citation(s) in RCA: 553] [Impact Index Per Article: 36.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Accepted: 11/28/2009] [Indexed: 12/24/2022]
Abstract
Wnt signaling controls a variety of developmental and homeostatic events. As a key component of Wnt signaling, Dishevelled (Dvl/Dsh) protein relays Wnt signals from receptors to downstream effectors. In the canonical Wnt pathway that depends on the nuclear translocation of beta-catenin, Dvl is recruited by the receptor Frizzled and prevents the constitutive destruction of cytosolic beta-catenin. In the non-canonical Wnt pathways such as Wnt-Frizzled/PCP (planar cell polarity) signaling, Dvl signals via the Daam1-RhoA axis and the Rac1 axis. In addition, Dvl plays important roles in Wnt-GSK3beta-microtubule signaling, Wnt-calcium signaling, Wnt-RYK signaling, Wnt-atypical PKC signaling, etc. Dvl also functions to mediate receptor endocytosis. To fulfill its multifaceted functions, it is not surprising that Dvl associates with various kinds of proteins. Its activity is also modulated dynamically by phosphorylation, ubiquitination and degradation. In this review, we summarize the current understanding of Dvl functions in Wnt signal transduction and its biological functions in mouse development, and also discuss the molecular mechanisms of its actions.
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36
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Ryks: new partners for Wnts in the developing and regenerating nervous system. Trends Neurosci 2009; 33:84-92. [PMID: 20004982 DOI: 10.1016/j.tins.2009.11.005] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Revised: 10/08/2009] [Accepted: 11/17/2009] [Indexed: 12/21/2022]
Abstract
Conserved Ryk transmembrane proteins, tyrosine kinase-related Wnt receptors, are important during neurogenesis, axon guidance and synaptogenesis. Here, we review the increasingly complex biology of the Wnt/Ryk pathway, emphasizing the mechanisms by which Ryks transduce or sometimes block the Wnt signal. Recent studies reveal that Wnts signal through Ryk via multiple mechanisms, including nuclear translocation of their intracellular domains and pathways employing Src Family Kinases and members of the canonical Wnt pathway. We also discuss reports indicating that Wnt/Ryk axon guidance roles are evolutionarily conserved and Wnt/Ryk interactions are required for motoneuron target selection and synaptogenesis at the neuromuscular junction. Recent findings that injury-induced Wnt/Ryk pathway activation inhibits axon regeneration underscore the importance of further understanding this novel pathway.
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Abstract
The Wnt family of secreted ligands act through many receptors to stimulate distinct intracellular signalling pathways in embryonic development, in adults and in disease processes. Binding of Wnt to the Frizzled family of receptors and to low density lipoprotein receptor-related protein 5 (LRP5) or LRP6 co-receptors stimulates the intracellular Wnt-beta-catenin signalling pathway, which regulates beta-cateninstability and context-dependent transcription. This signalling pathway controls many processes, such as cell fate determination, cell proliferation and self-renewal of stem and progenitor cells. Intriguingly, the transmembrane receptor Tyr kinases Ror2 and Ryk, as well as Frizzledreceptors that act independently of LRP5 or LRP6, function as receptors for Wnt and activate beta-catenin-independent pathways. This leads to changes in cell movement and polarity and to the antagonism of the beta-catenin pathway.
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Affiliation(s)
- Stephane Angers
- Leslie Dan Faculty of Pharmacy and the Department of Biochemistry, University of Toronto, Ontario, M5S 3M2, Canada.
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38
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Pepper DJ, Bicknell AB. The stimulation of mitogenic signaling pathways by N-POMC peptides. Mol Cell Endocrinol 2009; 300:77-82. [PMID: 18950678 PMCID: PMC2651482 DOI: 10.1016/j.mce.2008.09.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Revised: 09/23/2008] [Accepted: 09/23/2008] [Indexed: 11/20/2022]
Abstract
The N-terminal fragment of pro-opiomelancortin (POMC) has been shown previously to act as an adrenal mitogen. However, little is known about the molecular mechanisms by which mitogenesis is stimulated, although it has been shown that N-POMC(1-28) stimulates the ERK pathway in human H295R cells. We have investigated signaling stimulated by N-POMC(1-28) and N-POMC(1-49) in the mouse Y1 cell line and found that both peptides stimulate ERK phosphorylation with maximal stimulation being achieved within 5min. Similar results were observed for both MEK and c-Raf phosphorylation, although N-POMC(1-49) stimulated the phosphorylation of Akt more robustly than N-POMC(1-28). We also investigated the expression of tyrosine kinase receptors in adrenal cells. PCR utilizing degenerate primers was performed on cDNA from both Y1 cells and rat adrenal tissue. Sequencing of 114 clones from each cDNA population revealed the expression of a number of receptors, several of which have not been described previously in the adrenal.
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Lyu J, Yamamoto V, Lu W. Cleavage of the Wnt Receptor Ryk Regulates Neuronal Differentiation during Cortical Neurogenesis. Dev Cell 2008; 15:773-80. [DOI: 10.1016/j.devcel.2008.10.004] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Revised: 09/10/2008] [Accepted: 10/08/2008] [Indexed: 11/28/2022]
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40
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Upregulation of Ryk expression in rat dorsal root ganglia after peripheral nerve injury. Brain Res Bull 2008; 77:178-84. [DOI: 10.1016/j.brainresbull.2008.05.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Revised: 04/04/2008] [Accepted: 05/09/2008] [Indexed: 11/18/2022]
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41
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Abstract
Failure of axon regeneration in the mammalian CNS is attributable in part to the presence of various inhibitory molecules, including myelin-associated proteins and proteoglycans enriched in glial scars. Here, we evaluate whether axon guidance molecules also regulate regenerative growth after injury in adulthood. Wnts are a large family of axon guidance molecules that can attract ascending axons and repel descending axons along the length of the developing spinal cord. Their expression (all 19 Wnts) is not detectable in normal adult spinal cord by in situ hybridization. However, three of them are clearly reinduced after spinal cord injury. Wnt1 and Wnt5a, encoding potent repellents of the descending corticospinal tract (CST) axons, were robustly and acutely induced broadly in the spinal cord gray matter after unilateral hemisection. Ryk, the conserved repulsive Wnt receptor, was also induced in the lesion area, and Ryk immunoreactivity was found on the lesioned CST axons. Wnt4, which attracts ascending sensory axons in development, was acutely induced in areas closer to the lesion than Wnt1 and Wnt5a. Injection of function-blocking Ryk antibodies into the dorsal bilateral hemisectioned spinal cord either prevented the retraction of CST axons or promoted their regrowth but clearly enhanced the sprouting of CST collateral branches around and beyond the injury site. Therefore, repulsive Wnt signaling may be a cause of cortical spinal tract axon retraction and inhibits axon sprouting after injury.
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Abstract
The Wnt family of secreted signaling factors plays numerous roles in embryonic development and in stem cell biology. In the adult, Wnt signaling is involved in tissue homeostasis and mutations that lead to the overexpression of Wnt can be linked to cancer. Wnt signaling is transduced intracellularly by the Frizzled (Fzd) family of receptors. In the canonical pathway, accumulation of beta-catenin and the subsequent formation of a complex with T cell factors (TCF) or lymphoid enhancing factors (Lef) lead to target gene activation. The identification of Ryk as an alternative Wnt receptor and the discovery of the novel Fzd ligands Norrie disease protein (NDP) and R-Spondin, changed the traditional view of Wnts binding to Fzd receptors. Mouse R-Spondin cooperates with Wnt signaling and Low density lipoprotein (LDL) receptor related protein (LRP) to activate beta-catenin dependent gene expression and is involved in processes such as limb and placental development in the mouse. NDP is the product of the Norrie disease gene and controls vascular development in the retina, inner ear and in the female reproductive system during pregnancy. In this review a functional overview of the interactions of the different Wnt and non-Wnt ligands with the Fzd receptors is given as well as a survey of Wnts binding to Ryk and we discuss the biological significance of these interactions.
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Affiliation(s)
- Marijke Hendrickx
- Vrije Universiteit Brussel, Lab for Cell Genetics, 2 Pleinlaan, B-1050 Brussels, Belgium
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43
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Grillenzoni N, Flandre A, Lasbleiz C, Dura JM. Respective roles of the DRL receptor and its ligand WNT5 in Drosophila mushroom body development. Development 2007; 134:3089-97. [PMID: 17652353 DOI: 10.1242/dev.02876] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In recent decades, Drosophila mushroom bodies (MBs) have become a powerful model for elucidating the molecular mechanisms underlying brain development and function. We have previously characterized the derailed (drl; also known as linotte) receptor tyrosine kinase as an essential component of adult MB development. Here we show, using MARCM clones, a non-cell-autonomous requirement for the DRL receptor in MB development. This result is in accordance with the pattern of DRL expression, which occurs throughout development close to, but not inside,MB cells. While DRL expression can be detected within both interhemispheric glial and commissural neuronal cells, rescue of the drl MB defects appears to involve the latter cellular type. The WNT5 protein has been shown to act as a repulsive ligand for the DRL receptor in the embryonic central nervous system. We show here that WNT5 is required intrinsically within MB neurons for proper MB axonal growth and probably interacts with the extrinsic DRL receptor in order to stop axonal growth. We therefore propose that the neuronal requirement for both proteins defines an interacting network acting during MB development.
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Affiliation(s)
- Nicola Grillenzoni
- Institut de Génétique Humaine, CNRS UPR 1142, 141 rue de la Cardonille, 34396 Montpellier Cedex, France
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44
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Harris KE, Beckendorf SK. Different Wnt signals act through the Frizzled and RYK receptors during Drosophila salivary gland migration. Development 2007; 134:2017-25. [PMID: 17507403 DOI: 10.1242/dev.001164] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Guided cell migration is necessary for the proper function and development of many tissues, one of which is the Drosophila embryonic salivary gland. Here we show that two distinct Wnt signaling pathways regulate salivary gland migration. Early in migration, the salivary gland responds to a WNT4-Frizzled signal for proper positioning within the embryo. Disruption of this signal, through mutations in Wnt4, frizzled or frizzled 2, results in misguided salivary glands that curve ventrally. Furthermore, disruption of downstream components of the canonical Wnt pathway,such as dishevelled or Tcf, also results in ventrally curved salivary glands. Analysis of a second Wnt signal, which acts through the atypical Wnt receptor Derailed, indicates a requirement for Wnt5signaling late in salivary gland migration. WNT5 is expressed in the central nervous system and acts as a repulsive signal, needed to keep the migrating salivary gland on course. The receptor for WNT5, Derailed, is expressed in the actively migrating tip of the salivary glands. In embryos mutant for derailed or Wnt5, salivary gland migration is disrupted; the tip of the gland migrates abnormally toward the central nervous system. Our results suggest that both the Wnt4-frizzled pathway and a separate Wnt5-derailed pathway are needed for proper salivary gland migration.
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Affiliation(s)
- Katherine E Harris
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA
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45
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Castells E, Casacuberta JM. Signalling through kinase-defective domains: the prevalence of atypical receptor-like kinases in plants. JOURNAL OF EXPERIMENTAL BOTANY 2007; 58:3503-11. [PMID: 17951602 DOI: 10.1093/jxb/erm226] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The structure of plant receptor-like kinases (RLKs) is similar to that of animal receptor tyrosine kinases (RTKs), and consists of an extracellular domain, a transmembrane span, and a cytoplasmic domain containing the conserved kinase domain. The mechanism by which animal RTKs, and probably plant RLKs, signal includes the dimerization of the receptor, their intermolecular phosphorylation, and the phosphorylation of downstream signalling proteins. However, atypical RTKs with a kinase-dead domain that signal through phosphorylation-independent mechanisms have also been described in animals. In the last few years, some atypical RLKs have also been reported in plants. Here these examples and their possible signalling mechanisms are reviewed. Plant genomes contain a much larger number of genes coding for receptor kinases than other organisms. The prevalence of atypical RLKs in plants is analysed here. A sequence analysis of the Arabidopsis kinome revealed that 13% of the kinase genes do not retain some of the residues that are considered as invariant within kinase catalytic domains, and are thus putatively kinase-defective. This percentage rises to close to 20% when analysing RLKs, suggesting that phosphorylation-independent mechanisms mediated by atypical RLKs are particularly important for signal transduction in plants.
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Affiliation(s)
- Enric Castells
- Departament de Genètica Molecular Vegetal, Laboratori de Genètica Molecular Vegetal, CSIC-IRTA, Jordi Girona 18, Barcelona, Spain
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46
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Keeble TR, Halford MM, Seaman C, Kee N, Macheda M, Anderson RB, Stacker SA, Cooper HM. The Wnt receptor Ryk is required for Wnt5a-mediated axon guidance on the contralateral side of the corpus callosum. J Neurosci 2006; 26:5840-8. [PMID: 16723543 PMCID: PMC6675257 DOI: 10.1523/jneurosci.1175-06.2006] [Citation(s) in RCA: 181] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ryk (receptor related to tyrosine kinase) has been shown to be a novel Wnt receptor in both Caenorhabditis elegans and Drosophila melanogaster. Recently, Ryk-Wnt interactions were shown to guide corticospinal axons down the embryonic mouse spinal cord. Here we show that, in Ryk-deficient mice, cortical axons project aberrantly across the major forebrain commissure, the corpus callosum. Many mouse mutants have been described in which loss-of-function mutations result in the inability of callosal axons to cross the midline, thereby forming Probst bundles on the ipsilateral side. In contrast, loss of Ryk does not interfere with the ability of callosal axons to cross the midline but impedes their escape from the midline into the contralateral side. Therefore, Ryk(-/-) mice display a novel callosal guidance phenotype. We also show that Wnt5a acts as a chemorepulsive ligand for Ryk, driving callosal axons toward the contralateral hemisphere after crossing the midline. In addition, whereas callosal axons do cross the midline in Ryk(-/-) embryos, they are defasciculated on the ipsilateral side, indicating that Ryk also promotes fasciculation of axons before midline crossing. In summary, this study expands the emerging role for Wnts in axon guidance and identifies Ryk as a key guidance receptor in the establishment of the corpus callosum. Our analysis of Ryk function further advances our understanding of the molecular mechanisms underlying the formation of this important commissure.
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Affiliation(s)
- Thomas R Keeble
- The Queensland Brain Institute, University of Queensland, Brisbane, Queensland 4072, Australia
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47
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Liepinsh E, Bányai L, Patthy L, Otting G. NMR structure of the WIF domain of the human Wnt-inhibitory factor-1. J Mol Biol 2006; 357:942-50. [PMID: 16476441 DOI: 10.1016/j.jmb.2006.01.047] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2005] [Revised: 01/05/2006] [Accepted: 01/11/2006] [Indexed: 11/17/2022]
Abstract
The human Wnt-binding protein Wnt-inhibitory factor-1 (WIF-1) comprises an N-terminal WIF module followed by five EGF-like repeats. Here we report the three-dimensional structure of the WIF domain of WIF-1 determined by NMR spectroscopy. The fold consists of an eight-stranded beta-sandwich reminiscent of the immunoglobulin fold. Residual detergent (Brij-35) used in the refolding protocol was found to bind tightly to the WIF domain. The binding site was identified by intermolecular nuclear Overhauser effects observed between the WIF domain and the alkyl chain of the detergent. The results point to a possible role of WIF domains as a recognition motif of Wnt and Drosophila Hedgehog proteins that are activated by palmitoylation.
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Schmitt AM, Shi J, Wolf AM, Lu CC, King LA, Zou Y. Wnt-Ryk signalling mediates medial-lateral retinotectal topographic mapping. Nature 2006; 439:31-7. [PMID: 16280981 DOI: 10.1038/nature04334] [Citation(s) in RCA: 212] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2005] [Accepted: 10/19/2005] [Indexed: 01/10/2023]
Abstract
Computational modelling has suggested that at least two counteracting forces are required for establishing topographic maps. Ephrin-family proteins are required for both anterior-posterior and medial-lateral topographic mapping, but the opposing forces have not been well characterized. Wnt-family proteins are recently discovered axon guidance cues. We find that Wnt3 is expressed in a medial-lateral decreasing gradient in chick optic tectum and mouse superior colliculus. Retinal ganglion cell (RGC) axons from different dorsal-ventral positions showed graded and biphasic response to Wnt3 in a concentration-dependent manner. Wnt3 repulsion is mediated by Ryk, expressed in a ventral-to-dorsal decreasing gradient, whereas attraction of dorsal axons at lower Wnt3 concentrations is mediated by Frizzled(s). Overexpression of Wnt3 in the lateral tectum repelled the termination zones of dorsal RGC axons in vivo. Expression of a dominant-negative Ryk in dorsal RGC axons caused a medial shift of the termination zones, promoting medially directed interstitial branches and eliminating laterally directed branches. Therefore, a classical morphogen, Wnt3, acting as an axon guidance molecule, plays a role in retinotectal mapping along the medial-lateral axis, counterbalancing the medial-directed EphrinB1-EphB activity.
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Affiliation(s)
- Adam M Schmitt
- Department of Neurobiology, Pharmacology and Physiology, University of Chicago, Chicago, Illinois 60637, USA
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Keeble TR, Cooper HM. Ryk: A novel Wnt receptor regulating axon pathfinding. Int J Biochem Cell Biol 2006; 38:2011-7. [PMID: 16971168 DOI: 10.1016/j.biocel.2006.07.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Revised: 07/19/2006] [Accepted: 07/21/2006] [Indexed: 10/24/2022]
Abstract
Members of the Wnt family and their receptors, the Frizzleds, are key regulators of pivotal developmental processes including embryonic patterning, specification of cell fate, and determination of cell polarity. The versatility and complexity of Wnt signaling has been further highlighted by the emergence of a novel family of Wnt receptors, the Ryk family. In mammals and flies, Ryk is a key chemorepulsive axon guidance receptor responsible for the establishment of important axon tracts during nervous system development. Although the function of Ryk is currently best understood with respect to this role, its widespread expression, both in developing tissues and in the adult, suggests that Ryk may regulate many essential biological processes. This hypothesis is supported by the multiple developmental phenotypes apparent in Ryk loss-of-function mice. These mice display a variety of embryonic abnormalities, including disruption of skeletal, craniofacial and cardiac development. Here we review Ryk structure and function focusing on its activity as an axon guidance receptor.
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Affiliation(s)
- Thomas R Keeble
- The Queensland Brain Institute, The University of Queensland, Brisbane, Queensland 4072, Australia.
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Liu Y, Shi J, Lu CC, Wang ZB, Lyuksyutova AI, Song XJ, Song X, Zou Y. Ryk-mediated Wnt repulsion regulates posterior-directed growth of corticospinal tract. Nat Neurosci 2005; 8:1151-9. [PMID: 16116452 DOI: 10.1038/nn1520] [Citation(s) in RCA: 213] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2005] [Accepted: 07/15/2005] [Indexed: 11/08/2022]
Abstract
Guidance cues along the longitudinal axis of the CNS are poorly understood. Wnt proteins attract ascending somatosensory axons to project from the spinal cord to the brain. Here we show that Wnt proteins repel corticospinal tract (CST) axons in the opposite direction. Several Wnt genes were found to be expressed in the mouse spinal cord gray matter, cupping the dorsal funiculus, in an anterior-to-posterior decreasing gradient along the cervical and thoracic cord. Wnts repelled CST axons in collagen gel assays through a conserved high-affinity receptor, Ryk, which is expressed in CST axons. Neonatal spinal cord secretes diffusible repellent(s) in an anterior-posterior graded fashion, with anterior cord being stronger, and the repulsive activity was blocked by antibodies to Ryk (anti-Ryk). Intrathecal injection of anti-Ryk blocked the posterior growth of CST axons. Therefore, Wnt proteins may have a general role in anterior-posterior guidance of multiple classes of axons.
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Affiliation(s)
- Yaobo Liu
- Department of Neurobiology, Pharmacology and Physiology, University of Chicago, Chicago, Illinois 60637, USA
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