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Journal ArticleDOI

The Fibroblast Growth Factor signaling pathway

TL;DR: Members of the FGF family function in the earliest stages of embryonic development and during organogenesis to maintain progenitor cells and mediate their growth, differentiation, survival, and patterning.
Abstract: The signaling component of the mammalian Fibroblast Growth Factor (FGF) family is comprised of eighteen secreted proteins that interact with four signaling tyrosine kinase FGF receptors (FGFRs) Interaction of FGF ligands with their signaling receptors is regulated by protein or proteoglycan cofactors and by extracellular binding proteins Activated FGFRs phosphorylate specific tyrosine residues that mediate interaction with cytosolic adaptor proteins and the RAS-MAPK, PI3K-AKT, PLCγ, and STAT intracellular signaling pathways Four structurally related intracellular non-signaling FGFs interact with and regulate the family of voltage gated sodium channels Members of the FGF family function in the earliest stages of embryonic development and during organogenesis to maintain progenitor cells and mediate their growth, differentiation, survival, and patterning FGFs also have roles in adult tissues where they mediate metabolic functions, tissue repair, and regeneration, often by reactivating developmental signaling pathways Consistent with the presence of FGFs in almost all tissues and organs, aberrant activity of the pathway is associated with developmental defects that disrupt organogenesis, impair the response to injury, and result in metabolic disorders, and cancer © 2015 Wiley Periodicals, Inc
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Journal ArticleDOI
TL;DR: The current understanding of cellular and molecular mechanisms involved in tumor angiogenesis is summarized and challenges and opportunities associated with vascular targeting are discussed.
Abstract: Tumor vascularization occurs through several distinct biological processes, which not only vary between tumor type and anatomic location, but also occur simultaneously within the same cancer tissue. These processes are orchestrated by a range of secreted factors and signaling pathways and can involve participation of non-endothelial cells, such as progenitors or cancer stem cells. Anti-angiogenic therapies using either antibodies or tyrosine kinase inhibitors have been approved to treat several types of cancer. However, the benefit of treatment has so far been modest, some patients not responding at all and others acquiring resistance. It is becoming increasingly clear that blocking tumors from accessing the circulation is not an easy task to accomplish. Tumor vessel functionality and gene expression often differ vastly when comparing different cancer subtypes, and vessel phenotype can be markedly heterogeneous within a single tumor. Here, we summarize the current understanding of cellular and molecular mechanisms involved in tumor angiogenesis and discuss challenges and opportunities associated with vascular targeting.

703 citations

Journal ArticleDOI
TL;DR: Treatment with subcutaneously administered pegbelfermin for 16 weeks was generally well tolerated and significantly reduced hepatic fat fraction in patients with non-alcoholic steatohepatitis, and the full planned sample size was not needed.

347 citations

Journal ArticleDOI
TL;DR: Progress made on understanding the functions of the FGF signaling pathway during critical stages of skeletogenesis is examined, and the mechanisms by which mutations in FGF signalling molecules cause skeletal malformations in humans are explored.
Abstract: Fibroblast growth factor (FGF) signaling pathways are essential regulators of vertebrate skeletal development. FGF signaling regulates development of the limb bud and formation of the mesenchymal condensation and has key roles in regulating chondrogenesis, osteogenesis, and bone and mineral homeostasis. This review updates our review on FGFs in skeletal development published in Genes & Development in 2002, examines progress made on understanding the functions of the FGF signaling pathway during critical stages of skeletogenesis, and explores the mechanisms by which mutations in FGF signaling molecules cause skeletal malformations in humans. Links between FGF signaling pathways and other interacting pathways that are critical for skeletal development and could be exploited to treat genetic diseases and repair bone are also explored.

294 citations


Cites background from "The Fibroblast Growth Factor signal..."

  • ...In chondrocytes, FGFR3 has been found to specifically activate STAT1 (Su et al. 1997; Sahni et al. 1999)....

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  • ...In cultured chondrocytes, FGFR3 suppression of chondrocyte proliferation required MAPK signaling and was independent of STAT signaling (Raucci et al. 2004; Krejci et al. 2008a)....

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  • ...Although the mechanism by which SNAIL1 regulates STAT1 and MAPK is not known, a recent report showed that SNAIL1 may regulate the nuclear localization of p-ERK (Smith et al. 2014)....

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  • ...The function of the STAT1 and MAPK branches of the FGFR3 signal pathway may not be completely distinct....

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  • ...Functionally, SNAIL1 appears to activate both the STAT1 and MAPK branches of the FGFR3 signaling pathway, as ectopic activation of SNAIL1 resulted in nuclear translocation of STAT1 and increased phosphorylation of ERK1/2 (de Frutos et al. 2007)....

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Journal ArticleDOI
TL;DR: The endothelium is capable of remarkable plasticity in the embryo and in the adult, maintenance of differentiated endothelial state is an active process requiring constant signalling input that leads to the development of endothelial-to-mesenchymal transition that plays an important role in pathogenesis of a number of diseases.
Abstract: The endothelium is capable of remarkable plasticity. In the embryo, primitive endothelial cells differentiate to acquire arterial, venous or lymphatic fates. Certain endothelial cells also undergo hematopoietic transition giving rise to multi-lineage hematopoietic stem and progenitors while others acquire mesenchymal properties necessary for heart development. In the adult, maintenance of differentiated endothelial state is an active process requiring constant signalling input. The failure to do so leads to the development of endothelial-to-mesenchymal transition that plays an important role in pathogenesis of a number of diseases. A better understanding of these phenotypic changes may lead to development of new therapeutic interventions.

292 citations

Journal ArticleDOI
TL;DR: A framework for classifying tumours is proposed that holds promise for enabling clinicians to personalize optimal interventions based on the evolvability of the patient's tumour, and the Evo- and Eco-indices provide a common lexicon for communicating about how neoplasms change in response to interventions.
Abstract: Neoplasms change over time through a process of cell-level evolution, driven by genetic and epigenetic alterations. However, the ecology of the microenvironment of a neoplastic cell determines which changes provide adaptive benefits. There is widespread recognition of the importance of these evolutionary and ecological processes in cancer, but to date, no system has been proposed for drawing clinically relevant distinctions between how different tumours are evolving. On the basis of a consensus conference of experts in the fields of cancer evolution and cancer ecology, we propose a framework for classifying tumours that is based on four relevant components. These are the diversity of neoplastic cells (intratumoural heterogeneity) and changes over time in that diversity, which make up an evolutionary index (Evo-index), as well as the hazards to neoplastic cell survival and the resources available to neoplastic cells, which make up an ecological index (Eco-index). We review evidence demonstrating the importance of each of these factors and describe multiple methods that can be used to measure them. Development of this classification system holds promise for enabling clinicians to personalize optimal interventions based on the evolvability of the patient's tumour. The Evo- and Eco-indices provide a common lexicon for communicating about how neoplasms change in response to interventions, with potential implications for clinical trials, personalized medicine and basic cancer research.

290 citations

References
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Journal ArticleDOI
29 Jun 2007-Cell
TL;DR: Those Akt substrates that are most likely to contribute to the diverse cellular roles of Akt, which include cell survival, growth, proliferation, angiogenesis, metabolism, and migration are discussed.

5,505 citations

Journal ArticleDOI
TL;DR: The data reveal that multiple extracellular, cytoplasmic, and nuclear regulators intricately modulate Wnt signaling levels, and that receptor-ligand specificity and feedback loops help to determine WNT signaling outputs.
Abstract: Tight control of cell-cell communication is essential for the generation of a normally patterned embryo. A critical mediator of key cell-cell signaling events during embryogenesis is the highly conserved Wnt family of secreted proteins. Recent biochemical and genetic analyses have greatly enriched our understanding of how Wnts signal, and the list of canonical Wnt signaling components has exploded. The data reveal that multiple extracellular, cytoplasmic, and nuclear regulators intricately modulate Wnt signaling levels. In addition, receptor-ligand specificity and feedback loops help to determine Wnt signaling outputs. Wnts are required for adult tissue maintenance, and perturbations in Wnt signaling promote both human degenerative diseases and cancer. The next few years are likely to see novel therapeutic reagents aimed at controlling Wnt signaling in order to alleviate these conditions.

5,129 citations

Journal ArticleDOI
06 Nov 1997-Nature
TL;DR: A new gene, termed klotho, has been identified that is involved in the suppression of several ageing phenotypes in the mouse, and may function as part of a signalling pathway that regulates ageing in vivo and morbidity in age-related diseases.
Abstract: A new gene, termed klotho, has been identified that is involved in the suppression of several ageing phenotypes. A defect in klotho gene expression in the mouse results in a syndrome that resembles human ageing, including a short lifespan, infertility, arteriosclerosis, skin atrophy, osteoporosis and emphysema. The gene encodes a membrane protein that shares sequence similarity with the β-glucosidase enzymes. The klotho gene product may function as part of a signalling pathway that regulates ageing in vivo and morbidity in age-related diseases.

3,025 citations

01 Jan 1999
TL;DR: A new gene, termed klotho, has been identified that is involved in the suppression of several ageing phenotypes in the mouse, including short lifespan, infertility, arteriosclerosis, skin atrophy, osteoporosis and emphysema as mentioned in this paper.
Abstract: A new gene, termed klotho, has been identified that is involved in the suppression of several ageing phenotypes. A defect in klotho gene expression in the mouse results in a syndrome that resembles human ageing, including a short lifespan, infertility, arteriosclerosis, skin atrophy, osteoporosis and emphysema. The gene encodes a membrane protein that shares sequence similarity with the β-glucosidase enzymes. The klotho gene product may function as part of a signalling pathway that regulates ageing in vivo and morbidity in age-related diseases.

2,601 citations

Journal ArticleDOI
22 Feb 1991-Cell
TL;DR: It is demonstrated that free heparin and heparan sulfate can reconstitute a low affinity receptor that is, in turn, required for the high affinity binding of bFGF.

2,448 citations