The Roles of Fgfs in the Early Development of Vertebrate Limbs
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Wnt Signalling During Limb Development
Int. J. Dev. Biol. 46: 927-936 (2002) Wnt signalling during limb development VICKI L. CHURCH and PHILIPPA FRANCIS-WEST* Department of Craniofacial Development, King’s College London, Guy’s Hospital, London, UK ABSTRACT Wnts control a number of processes during limb development - from initiating outgrowth and controlling patterning, to regulating cell differentiation in a number of tissues. Interactions of Wnt signalling pathway components with those of other signalling pathways have revealed new mechanisms of modulating Wnt signalling, which may explain how different responses to Wnt signalling are elicited in different cells. Given the number of Wnts that are expressed in the limb and their ability to induce differential responses, the challenge will be to dissect precisely how Wnt signalling is regulated and how it controls limb development at a cellular level, together with the other signalling pathways, to produce the functional limb capable of co- ordinated precise movements. KEY WORDS: Wnt, limb, development, chondrogenesis, myogenesis The Wnt Gene Family is found in the others (Cadigan and Nusse, 1997). The frizzled receptors can function together with the LRP co-receptors, which The Wnt family of secreted glycosylated factors consists of 22 are single transmembrane proteins containing LDL receptor re- members in vertebrates which have a range of functions during peats, two frizzled motifs and four EGF type repeats in the development from patterning individual structures to fine tuning at extracellular domain (reviewed by Pandur and Kühl, 2001; also see a cellular level controlling cell differentiation, proliferation and Roszmusz et al., 2001). The LRPs, which include the vertebrate survival. The founding members of this family are the Drosophila genes LRP4, -5 and -6 and the Drosophila gene arrow, form a segment polarity gene Wingless (Wg), required for wing develop- complex with frizzled in a Wnt-dependent manner and signal in the ment, together with Wnt1 (originally named int-1) in the mouse. -
Fgf17b and FGF18 Have Different Midbrain Regulatory Properties from Fgf8b Or Activated FGF Receptors Aimin Liu1,2, James Y
Research article 6175 FGF17b and FGF18 have different midbrain regulatory properties from FGF8b or activated FGF receptors Aimin Liu1,2, James Y. H. Li2, Carrie Bromleigh2, Zhimin Lao2, Lee A. Niswander1 and Alexandra L. Joyner2,* 1Howard Hughes Medical Institute, Developmental Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10021, USA 2Howard Hughes Medical Institute and Skirball Institute of Biomolecular Medicine, Departments of Cell Biology, and Physiology and Neuroscience, NYU School of Medicine, New York, NY 10016, USA *Author for correspondence (e-mail: [email protected]) Accepted 28 August 2003 Development 130, 6175-6185 Published by The Company of Biologists 2003 doi:10.1242/dev.00845 Summary Early patterning of the vertebrate midbrain and region in the midbrain, correlating with cerebellum cerebellum is regulated by a mid/hindbrain organizer that development. By contrast, FGF17b and FGF18 mimic produces three fibroblast growth factors (FGF8, FGF17 FGF8a by causing expansion of the midbrain and and FGF18). The mechanism by which each FGF upregulating midbrain gene expression. This result is contributes to patterning the midbrain, and induces a consistent with Fgf17 and Fgf18 being expressed in the cerebellum in rhombomere 1 (r1) is not clear. We and midbrain and not just in r1 as Fgf8 is. Third, analysis of others have found that FGF8b can transform the midbrain gene expression in mouse brain explants with beads soaked into a cerebellum fate, whereas FGF8a can promote in FGF8b or FGF17b showed that the distinct activities of midbrain development. In this study we used a chick FGF17b and FGF8b are not due to differences in the electroporation assay and in vitro mouse brain explant amount of FGF17b protein produced in vivo. -
Masking Techniques
Available online at www.sciencedirect.com SCI ENCE(C$ DIRECT Developmental Biology 273 (2004) 361-372 www.elsevier.com/locate/ydbio The roles of Fgf4 and Fgf8 in limb bud initiation and outgrowth Anne M. Bouleta, Anne M. Moonb,c, Benjamin R. Arenkiela, Mario R. Capecchi3’* ^Department of Human Genetics, Howard Hughes Medical Institute, University of Utah School of Medicine, Salt Lake City, UT 84112, USA bProgram in Human Molecular Biology and Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA cDepartment of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA Received for publication 12 May 2004, revised 16 June 2004, accepted 21 June 2004 Abstract Although numerous molecules required for limb bud formation have recently been identified, the molecular pathways that initiate this process and ensure that limb formation occurs at specific axial positions have yet to be fully elucidated. Based on experiments in the chick, Fg/8 expression in the intermediate mesoderm (IM) has been proposed to play a critical role in the initiation of limb bud outgrowth via restriction of Fgfl 0 expression to the appropriate region of the lateral plate mesoderm. Contrary to the outcome predicted by this model, ablation of Fgf8 expression in the intermediate mesoderm before limb bud initiation had no effect on initial limb bud outgrowth or on the formation of normal limbs. When their expression patterns were first elucidated, both Fgf4 and Fg/8 were proposed to mediate critical functions of the apical ectodermal ridge (AER), which is required for proper limb bud outgrowth. -
Fgf8 Is Mutated in Zebrafish Acerebellar
Development 125, 2381-2395 (1998) 2381 Printed in Great Britain © The Company of Biologists Limited 1998 DEV1265 Fgf8 is mutated in zebrafish acerebellar (ace) mutants and is required for maintenance of midbrain-hindbrain boundary development and somitogenesis Frank Reifers1, Heike Böhli1, Emily C. Walsh2, Phillip H. Crossley2, Didier Y. R. Stainier2 and Michael Brand1,* 1Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, D-69120 Heidelberg, Germany 2Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA 94143-0554, USA *Author for correspondence (e-mail: [email protected]) Accepted 2 April; published on WWW 3 June 1998 SUMMARY We describe the isolation of zebrafish Fgf8 and its gastrulation, and that Fgf8 functions later during expression during gastrulation, somitogenesis, fin bud and somitogenesis to polarize the midbrain. Fgf8 is also early brain development. By demonstrating genetic linkage expressed in a dorsoventral gradient during gastrulation and by analysing the structure of the Fgf8 gene, we show and ectopically expressed Fgf8 can dorsalize embryos. that acerebellar is a zebrafish Fgf8 mutation that may Nevertheless, acerebellar mutants show only mild inactivate Fgf8 function. Homozygous acerebellar embryos dorsoventral patterning defects. Also, in spite of the lack a cerebellum and the midbrain-hindbrain boundary prominent role suggested for Fgf8 in limb development, the organizer. Fgf8 function is required to maintain, but not pectoral fins are largely unaffected in the mutants. Fgf8 is initiate, expression of Pax2.1 and other marker genes in this therefore required in development of several important area. We show that Fgf8 and Pax2.1 are activated in signaling centers in the zebrafish embryo, but may be adjacent domains that only later become overlapping, and redundant or dispensable for others. -
ARTICLES Fibroblast Growth Factors 1, 2, 17, and 19 Are The
0031-3998/07/6103-0267 PEDIATRIC RESEARCH Vol. 61, No. 3, 2007 Copyright © 2007 International Pediatric Research Foundation, Inc. Printed in U.S.A. ARTICLES Fibroblast Growth Factors 1, 2, 17, and 19 Are the Predominant FGF Ligands Expressed in Human Fetal Growth Plate Cartilage PAVEL KREJCI, DEBORAH KRAKOW, PERTCHOUI B. MEKIKIAN, AND WILLIAM R. WILCOX Medical Genetics Institute [P.K., D.K., P.B.M., W.R.W.], Cedars-Sinai Medical Center, Los Angeles, California 90048; Department of Obstetrics and Gynecology [D.K.] and Department of Pediatrics [W.R.W.], UCLA School of Medicine, Los Angeles, California 90095 ABSTRACT: Fibroblast growth factors (FGF) regulate bone growth, (G380R) or TD (K650E) mutations (4–6). When expressed at but their expression in human cartilage is unclear. Here, we deter- physiologic levels, FGFR3-G380R required, like its wild-type mined the expression of entire FGF family in human fetal growth counterpart, ligand for activation (7). Similarly, in vitro cul- plate cartilage. Using reverse transcriptase PCR, the transcripts for tivated human TD chondrocytes as well as chondrocytes FGF1, 2, 5, 8–14, 16–19, and 21 were found. However, only FGF1, isolated from Fgfr3-K644M mice had an identical time course 2, 17, and 19 were detectable at the protein level. By immunohisto- of Fgfr3 activation compared with wild-type chondrocytes and chemistry, FGF17 and 19 were uniformly expressed within the showed no receptor activation in the absence of ligand (8,9). growth plate. In contrast, FGF1 was found only in proliferating and hypertrophic chondrocytes whereas FGF2 localized predominantly to Despite the importance of the FGF ligand for activation of the resting and proliferating cartilage. -
Development of the Endochondral Skeleton
Downloaded from http://cshperspectives.cshlp.org/ on September 24, 2021 - Published by Cold Spring Harbor Laboratory Press Development of the Endochondral Skeleton Fanxin Long1,2 and David M. Ornitz2 1Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110 2Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri 63110 Correspondence: fl[email protected] SUMMARY Much of the mammalian skeleton is composed of bones that originate from cartilage templates through endochondral ossification. Elucidating the mechanisms that control endochondral bone development is critical for understanding human skeletal diseases, injury response, and aging. Mouse genetic studies in the past 15 years have provided unprecedented insights about molecules regulating chondrocyte formation, chondrocyte maturation, and osteoblast differ- entiation, all key processes of endochondral bone development. These include the roles of the secreted proteins IHH, PTHrP, BMPs, WNTs, and FGFs, their receptors, and transcription factors such as SOX9, RUNX2, and OSX, in regulating chondrocyte and osteoblast biology. This review aims to integrate the known functions of extracellular signals and transcription factors that regulate development of the endochondral skeleton. Outline 1 Introduction 5 Osteoblastogenesis 2 Mesenchymal condensation 6 Closing remarks 3 Chondrocyte differentiation References 4 Growth plate development Editors: Patrick P.L. Tam, W. James Nelson, and Janet Rossant Additional Perspectives on Mammalian Development available at www.cshperspectives.org Copyright # 2013 Cold Spring Harbor Laboratory Press; all rights reserved; doi: 10.1101/cshperspect.a008334 Cite this article as Cold Spring Harb Perspect Biol 2013;5:a008334 1 Downloaded from http://cshperspectives.cshlp.org/ on September 24, 2021 - Published by Cold Spring Harbor Laboratory Press F. -
Different Fgfs Have Distinct Roles in Regulating Neurogenesis After Spinal Cord Injury in Zebrafish Yona Goldshmit1,2, Jean Kitty K
Goldshmit et al. Neural Development (2018) 13:24 https://doi.org/10.1186/s13064-018-0122-9 RESEARCHARTICLE Open Access Different Fgfs have distinct roles in regulating neurogenesis after spinal cord injury in zebrafish Yona Goldshmit1,2, Jean Kitty K. Y. Tang1, Ashley L. Siegel1, Phong D. Nguyen1, Jan Kaslin1, Peter D. Currie1 and Patricia R. Jusuf1,3* Abstract Background: Despite conserved developmental processes and organization of the vertebrate central nervous system, only some vertebrates including zebrafish can efficiently regenerate neural damage including after spinal cord injury. The mammalian spinal cord shows very limited regeneration and neurogenesis, resulting in permanent life-long functional impairment. Therefore, there is an urgent need to identify the cellular and molecular mechanisms that can drive efficient vertebrate neurogenesis following injury. A key pathway implicated in zebrafish neurogenesis is fibroblast growth factor signaling. Methods: In the present study we investigated the roles of distinctfibroblastgrowthfactormembersandtheir receptors in facilitating different aspects of neural development and regeneration at different timepoints following spinal cord injury. After spinal cord injury in adults and during larval development, loss and/or gain of Fgf signaling was combined with immunohistochemistry, in situ hybridization and transgenes marking motor neuron populations in in vivo zebrafish and in vitro mammalian PC12 cell culture models. Results: Fgf3 drives neurogenesis of Islet1 expressing motor neuron subtypes and mediate axonogenesis in cMet expressing motor neuron subtypes. We also demonstrate that the role of Fgf members are not necessarily simple recapitulating development. During development Fgf2, Fgf3 and Fgf8 mediate neurogenesis of Islet1 expressing neurons and neuronal sprouting of both, Islet1 and cMet expressing motor neurons. -
Hox Genes Regulate the Onset of Tbx5 Expression in the Forelimb Carolina Minguillon1,*,‡, Satoko Nishimoto1, Sophie Wood2, Elisenda Vendrell1, Jeremy J
3180 RESEARCH ARTICLE Development 139, 3180-3188 (2012) doi:10.1242/dev.084814 © 2012. Published by The Company of Biologists Ltd Hox genes regulate the onset of Tbx5 expression in the forelimb Carolina Minguillon1,*,‡, Satoko Nishimoto1, Sophie Wood2, Elisenda Vendrell1, Jeremy J. Gibson-Brown3,§ and Malcolm P. O. Logan1,* SUMMARY Tbx4 and Tbx5 are two closely related T-box genes that encode transcription factors expressed in the prospective hindlimb and forelimb territories, respectively, of all jawed vertebrates. Despite their striking limb type-restricted expression pattern, we have shown that these genes do not participate in the acquisition of limb type-specific morphologies. Instead, Tbx4 and Tbx5 play similar roles in the initiation of hindlimb and forelimb outgrowth, respectively. We hypothesized that different combinations of Hox proteins expressed in different rostral and caudal domains of the lateral plate mesoderm, where limb induction occurs, might be involved in regulating the limb type-restricted expression of Tbx4 and Tbx5 and in the later determination of limb type-specific morphologies. Here, we identify the minimal regulatory element sufficient for the earliest forelimb-restricted expression of the mouse Tbx5 gene and show that this sequence is Hox responsive. Our results support a mechanism in which Hox genes act upstream of Tbx5 to control the axial position of forelimb formation. KEY WORDS: Tbx5, Hox, Limb development INTRODUCTION induce, and are markers of, forelimb and hindlimb outgrowth, T-box genes encode a family of transcription factors that have respectively, they do not play a role in the specification of limb been identified in all metazoans and which play diverse roles type-specific morphologies. -
A Frog Embryo with No Apical Ectodermal Ridge (AER)
J. Anat. (1998) 192, pp. 379–390, with 6 figures Printed in the United Kingdom 379 Limb development and evolution: a frog embryo with no apical ectodermal ridge (AER) MICHAEL K. RICHARDSON1, TIMOTHY F. CARL2, JAMES HANKEN2, RICHARD P. ELINSON3, CELIA COPE1 AND PETER BAGLEY1 " # Department of Anatomy, St George’s Hospital Medical School, London, UK, Department of Environmental, Population, $ and Organismic Biology, University of Colorado, Boulder, CO, USA, and Department of Zoology, University of Toronto, Toronto, Ontario, Canada (Accepted 27 January 1998) The treefrog Eleutherodactylus coqui is a direct developer—it has no tadpole stage. The limb buds develop earlier than in metamorphosing species (indirect developers, such as Xenopus laevis). Previous molecular studies suggest that at least some mechanisms of limb development in E. coqui are similar to those of other vertebrates and we wished to see how limb morphogenesis in this species compares with that in other vertebrates. We found that the hind limb buds are larger and more advanced than the forelimbs at all stages examined, thus differing from the typical amniote pattern. The limb buds were also small compared to those in the chick. Scanning and transmission electron microscopy showed that although the apical ectoderm is thickened, there was no apical ectodermal ridge (AER). In addition, the limb buds lacked the dorsoventral flattening seen in many amniotes. These findings could suggest a mechanical function for the AER in maintaining dorsoventral flattening, although not all data are consistent with this view. Removal of distal ectoderm from E. coqui hindlimb buds does not stop outgrowth, although it does produce anterior defects in the skeletal pattern. -
Sonic Hedgehog Signaling in Limb Development
REVIEW published: 28 February 2017 doi: 10.3389/fcell.2017.00014 Sonic Hedgehog Signaling in Limb Development Cheryll Tickle 1* and Matthew Towers 2* 1 Department of Biology and Biochemistry, University of Bath, Bath, UK, 2 Department of Biomedical Science, The Bateson Centre, University of Sheffield, Western Bank, Sheffield, UK The gene encoding the secreted protein Sonic hedgehog (Shh) is expressed in the polarizing region (or zone of polarizing activity), a small group of mesenchyme cells at the posterior margin of the vertebrate limb bud. Detailed analyses have revealed that Shh has the properties of the long sought after polarizing region morphogen that specifies positional values across the antero-posterior axis (e.g., thumb to little finger axis) of the limb. Shh has also been shown to control the width of the limb bud by stimulating mesenchyme cell proliferation and by regulating the antero-posterior length of the apical ectodermal ridge, the signaling region required for limb bud outgrowth and the laying down of structures along the proximo-distal axis (e.g., shoulder to digits axis) of the limb. It has been shown that Shh signaling can specify antero-posterior positional values in Edited by: limb buds in both a concentration- (paracrine) and time-dependent (autocrine) fashion. Andrea Erika Münsterberg, University of East Anglia, UK Currently there are several models for how Shh specifies positional values over time in the Reviewed by: limb buds of chick and mouse embryos and how this is integrated with growth. Extensive Megan Davey, work has elucidated downstream transcriptional targets of Shh signaling. Nevertheless, it University of Edinburgh, UK Robert Hill, remains unclear how antero-posterior positional values are encoded and then interpreted University of Edinburgh, UK to give the particular structure appropriate to that position, for example, the type of digit. -
T-Box Genes in Limb Development and Disease
Open Research Online The Open University’s repository of research publications and other research outputs T-box Genes in Limb Development and Disease Thesis How to cite: Rallis, Charalampos (2004). T-box Genes in Limb Development and Disease. PhD thesis The Open University. For guidance on citations see FAQs. c 2004 Charalampos Rallis Version: Version of Record Link(s) to article on publisher’s website: http://dx.doi.org/doi:10.21954/ou.ro.0000fa0b Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online’s data policy on reuse of materials please consult the policies page. oro.open.ac.uk T-box Genes in Limb Development and Disease Charalampos Rallis Thesis submitted for the degree of Doctor of Philosophy October 2004 Division of Developmental Biology National Institute for Medical Research Mill Hill London Open University ProQuest Number: C819643 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a com plete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest ProQuest C819643 Published by ProQuest LLO (2019). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States C ode Microform Edition © ProQuest LLO. ProQuest LLO. 789 East Eisenhower Parkway P.Q. -
The Biology of Hepatocellular Carcinoma: Implications for Genomic and Immune Therapies Galina Khemlina1,4*, Sadakatsu Ikeda2,3 and Razelle Kurzrock2
Khemlina et al. Molecular Cancer (2017) 16:149 DOI 10.1186/s12943-017-0712-x REVIEW Open Access The biology of Hepatocellular carcinoma: implications for genomic and immune therapies Galina Khemlina1,4*, Sadakatsu Ikeda2,3 and Razelle Kurzrock2 Abstract Hepatocellular carcinoma (HCC), the most common type of primary liver cancer, is a leading cause of cancer-related death worldwide. It is highly refractory to most systemic therapies. Recently, significant progress has been made in uncovering genomic alterations in HCC, including potentially targetable aberrations. The most common molecular anomalies in this malignancy are mutations in the TERT promoter, TP53, CTNNB1, AXIN1, ARID1A, CDKN2A and CCND1 genes. PTEN loss at the protein level is also frequent. Genomic portfolios stratify by risk factors as follows: (i) CTNNB1 with alcoholic cirrhosis; and (ii) TP53 with hepatitis B virus-induced cirrhosis. Activating mutations in CTNNB1 and inactivating mutations in AXIN1 both activate WNT signaling. Alterations in this pathway, as well as in TP53 and the cell cycle machinery, and in the PI3K/Akt/mTor axis (the latter activated in the presence of PTEN loss), as well as aberrant angiogenesis and epigenetic anomalies, appear to be major events in HCC. Many of these abnormalities may be pharmacologically tractable. Immunotherapy with checkpoint inhibitors is also emerging as an important treatment option. Indeed, 82% of patients express PD-L1 (immunohistochemistry) and response rates to anti-PD-1 treatment are about 19%, and include about 5% complete remissions as well as durable benefit in some patients. Biomarker-matched trials are still limited in this disease, and many of the genomic alterations in HCC remain challenging to target.