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Anerillas C, Perramon-Güell A, Altés G, Cuesta S, Vaquero M, Olomí A, Rodríguez-Barrueco R, Llobet-Navàs D, Egea J, Dolcet X, Yeramian A, Encinas M. Sprouty1 is a broad mediator of cellular senescence. Cell Death Dis 2024; 15:296. [PMID: 38670941 PMCID: PMC11053034 DOI: 10.1038/s41419-024-06689-4] [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: 10/10/2023] [Revised: 04/12/2024] [Accepted: 04/17/2024] [Indexed: 04/28/2024]
Abstract
Genes of the Sprouty family (Spry1-4) restrain signaling by certain receptor tyrosine kinases. Consequently, these genes participate in several developmental processes and function as tumor suppressors in adult life. Despite these important roles, the biology of this family of genes still remains obscure. Here we show that Sprouty proteins are general mediators of cellular senescence. Induction of cellular senescence by several triggers in vitro correlates with upregulation of Sprouty protein levels. More importantly, overexpression of Sprouty genes is sufficient to cause premature cellular senescence, via a conserved N-terminal tyrosine (Tyrosine 53 of Sprouty1). Accordingly, fibroblasts from knockin animals lacking that tyrosine escape replicative senescence. In vivo, heterozygous knockin mice display delayed induction of cellular senescence during cutaneous wound healing and upon chemotherapy-induced cellular senescence. Unlike other functions of this family of genes, induction of cellular senescence appears to be independent of activation of the ERK1/2 pathway. Instead, we show that Sprouty proteins induce cellular senescence upstream of the p38 pathway in these in vitro and in vivo paradigms.
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Affiliation(s)
- Carlos Anerillas
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain.
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, 251 Bayview Blvd., Baltimore, MD, USA.
- Homeostasis de tejidos y órganos program, Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas (CSIC) - Universidad Autónoma de Madrid, Madrid, Spain.
| | - Aida Perramon-Güell
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
| | - Gisela Altés
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
| | - Sara Cuesta
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
- Fundación de Investigación Biomédica de Cádiz, Hospital Universitario Puerta del Mar, Novena Planta, Investigación, Av Ana de Viya, 21, Cádiz, Spain
| | - Marta Vaquero
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
- Hospital Universitari Arnau de Vilanova, Rovira Roure, 80, Lleida, Spain
| | - Anna Olomí
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
| | - Ruth Rodríguez-Barrueco
- Laboratory of Precision Medicine, Oncobell Program. Bellvitge Biomedical Research Institute (IDIBELL), Gran via De l'Hospitalet, Barcelona, Spain
| | - David Llobet-Navàs
- Laboratory of Precision Medicine, Oncobell Program. Bellvitge Biomedical Research Institute (IDIBELL), Gran via De l'Hospitalet, Barcelona, Spain
| | - Joaquim Egea
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
| | - Xavi Dolcet
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
| | - Andrée Yeramian
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain
| | - Mario Encinas
- Developmental and Oncogenic Signaling Group, Universitat de Lleida/Institut de Recerca Biomèdica de Lleida, Rovira Roure, 80, Lleida, Spain.
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DiStasio A, Paulding D, Chaturvedi P, Stottmann RW. Nubp2 is required for cranial neural crest survival in the mouse. Dev Biol 2019; 458:189-199. [PMID: 31733190 DOI: 10.1016/j.ydbio.2019.10.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 10/16/2019] [Accepted: 10/26/2019] [Indexed: 12/31/2022]
Abstract
The N-ethyl-N-nitrosourea (ENU) ←forward genetic screen is a useful tool for the unbiased discovery of novel mechanisms regulating developmental processes. We recovered the dorothy mutation in such a screen designed to recover recessive mutations affecting craniofacial development in the mouse. Dorothy embryos die prenatally and exhibit many striking phenotypes commonly associated with ciliopathies, including a severe midfacial clefting phenotype. We used exome sequencing to discover a missense mutation in nucleotide binding protein 2 (Nubp2) to be causative. This finding was confirmed by a complementation assay with the dorothy allele and an independent Nubp2 null allele (Nubp2null). We demonstrated that Nubp2 is indispensable for embryogenesis. NUBP2 is implicated in both the cytosolic iron/sulfur cluster assembly pathway and negative regulation of ciliogenesis. Conditional ablation of Nubp2 in the neural crest lineage with Wnt1-cre recapitulates the dorothy craniofacial phenotype. Using this model, we found that the proportion of ciliated cells in the craniofacial mesenchyme was unchanged, and that markers of the SHH, FGF, and BMP signaling pathways are unaltered. Finally, we show evidence that the phenotype results from a marked increase in apoptosis within the craniofacial mesenchyme.
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Affiliation(s)
| | | | - Praneet Chaturvedi
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, OH, 45229, USA
| | - Rolf W Stottmann
- Division of Human Genetics, OH, 45229, USA; Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, OH, 45229, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, 45229, USA; Shriner's Hospital for Children - Cincinnati, Cincinnati, OH, USA.
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Dittmer J, Stütz A, Vanas V, Salhi J, Reisecker JM, Kral RM, Sutterlüty-Fall H. Spatial signal repression as an additional role of Sprouty2 protein variants. Cell Signal 2019; 62:109332. [PMID: 31154002 DOI: 10.1016/j.cellsig.2019.05.017] [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: 03/18/2019] [Revised: 05/29/2019] [Accepted: 05/29/2019] [Indexed: 11/19/2022]
Abstract
Sprouty2 (Spry2) is a prominent member of a protein family with crucial functions in the modulation of signal transduction. One of its main actions is the repression of mitogen-activated protein kinase (MAPK) pathway in response to growth factor-induced signalling. A common single nucleotide polymorphism within the Spry2 gene creates two protein variants where a proline adjacent to the serine rich domain is converted to an additional serine. Both protein variants perform similar functions although their efficiency in fulfilling these tasks varies. In this report, we used biochemical fractionation methods as well as confocal microscopy to analyse quantitative and qualitative differences in the distribution of Spry2 variants. We found that Spry2 proteins localize not solely to the plasma membrane, but also to other membrane engulfed compartments like for example the Golgi apparatus. In these less dense organelles, predominantly slower migrating forms reside indicating that posttranslational modification contributes to the distribution profile of Spry2. However there is no significant difference in the distribution of the two variants. Additionally, we found that Spry2 could be found exclusively in membrane fractions irrespective of the mitogen availability and the phosphorylation status. Considering the interference of extracellular signal-regulated kinase (ERK) activation in the cytoplasm, both Spry2 variants inhibited the levels of phosphorylated ERK (pERK) significantly to a similar extent. In contrast, the induction profiles of pERK levels were completely different in the nuclei. Again, both Spry2 variants diminished the levels of pERK. While the proline variant lowered the activation throughout the observation period, the serine variant failed to interfere with immediate accumulation of nuclear pERK levels, but the signal duration was shortened. Since the extent of the pERK inhibition in the nuclei was drastically more pronounced than in the cytoplasm, we conclude that Spry2 - in addition to its known functions as a repressor of general ERK phosphorylation - functions as a spatial repressor of nucleic ERK activation. Accordingly, a dominant negative version of Spry2 was only able to enhance the pERK levels of serum-deprived cells in the cytosol, while in the nucleus the intensity of the pERK signal in response to serum addition was significantly increased.
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Affiliation(s)
- Jakob Dittmer
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria
| | - Astrid Stütz
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria
| | - Vanita Vanas
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria
| | - Jihen Salhi
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria.
| | - Johannes Manfred Reisecker
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria.
| | - Rosana Maria Kral
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria.
| | - Hedwig Sutterlüty-Fall
- Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria.
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Hausott B, Park JW, Valovka T, Offterdinger M, Hess MW, Geley S, Klimaschewski L. Subcellular Localization of Sprouty2 in Human Glioma Cells. Front Mol Neurosci 2019; 12:73. [PMID: 30983969 PMCID: PMC6449699 DOI: 10.3389/fnmol.2019.00073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 03/08/2019] [Indexed: 11/17/2022] Open
Abstract
Sprouty proteins act ubiquitously as signaling integrators and inhibitors of receptor tyrosine kinase (RTK) activated pathways. Among the four Sprouty isoforms, Sprouty2 is a key regulator of growth factor signaling in several neurological disorders. High protein levels correlate with reduced survival of glioma patients. We recently demonstrated that abrogating its function inhibits tumor growth by overstimulation of ERK and induction of DNA replication stress. The important role of Sprouty2 in the proliferation of malignant glioma cells prompted us to investigate its subcellular localization applying super-resolution fluorescence and immunoelectron microscopy. We found that cytoplasmic Sprouty2 is not homogenously distributed but localized to small spots (<100 nm) partly attached to vimentin filaments and co-localized with activated ERK. The protein is associated with early, late and recycling endosomes in response to but also independently of growth factor stimulation. The subcellular localization of Sprouty2 in all areas exhibiting strong RTK activities may reflect a protective response of glioma cells to limit excessive ERK activation and to prevent cellular senescence and apoptosis.
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Affiliation(s)
- Barbara Hausott
- Department of Anatomy, Histology and Embryology, Division of Neuroanatomy, Medical University Innsbruck, Innsbruck, Austria
| | - Jong-Whi Park
- Department of Anatomy, Histology and Embryology, Division of Neuroanatomy, Medical University Innsbruck, Innsbruck, Austria
| | - Taras Valovka
- Department of Anatomy, Histology and Embryology, Division of Neuroanatomy, Medical University Innsbruck, Innsbruck, Austria
| | - Martin Offterdinger
- Biocenter, Division of Neurobiochemistry-Biooptics, Medical University Innsbruck, Innsbruck, Austria
| | - Michael W Hess
- Department of Anatomy, Histology and Embryology, Division of Histology, Medical University Innsbruck, Innsbruck, Austria
| | - Stephan Geley
- Biocenter, Division of Molecular Pathophysiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Lars Klimaschewski
- Department of Anatomy, Histology and Embryology, Division of Neuroanatomy, Medical University Innsbruck, Innsbruck, Austria
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6
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Chen FJ, Lee KW, Lai CC, Lee SP, Shen HH, Tsai SP, Liu BH, Wang LM, Liou GG. Structure of native oligomeric Sprouty2 by electron microscopy and its property of electroconductivity. Biochem Biophys Res Commun 2013; 439:351-6. [PMID: 24012675 DOI: 10.1016/j.bbrc.2013.08.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 08/26/2013] [Indexed: 12/28/2022]
Abstract
Receptor tyrosine kinases (RTKs) regulate many cellular processes, and Sprouty2 (Spry2) is known as an important regulator of RTK signaling pathways. Therefore, it is worth investigating the properties of Spry2 in more detail. In this study, we found that Spry2 is able to self-assemble into oligomers with a high-affinity KD value of approximately 16nM, as determined through BIAcore surface plasmon resonance analysis. The three-dimensional (3D) structure of Spry2 was resolved using an electron microscopy (EM) single-particle reconstruction approach, which revealed that Spry2 is donut-shaped with two lip-cover domains. Furthermore, the method of energy dispersive spectrum obtained through EM was analyzed to determine the elements carried by Spry2, and the results demonstrated that Spry2 is a silicon- and iron-containing protein. The silicon may contribute to the electroconductivity of Spry2, and this property exhibits a concentration-dependent feature. This study provides the first report of a silicon- and iron-containing protein, and its 3D structure may allow us (1) to study the potential mechanism through the signal transduction is controlled by switching the electronic transfer on or off and (2) to develop a new type of conductor or even semiconductor using biological or half-biological hybrid materials in the future.
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Affiliation(s)
- Feng-Jung Chen
- Institute of Molecular and Genomic Medicine, National Health Research Institutes, Miaoli 35053, Taiwan, ROC; Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, ROC
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7
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Sharma AK, Pallesen LJ, Spang RJ, Walden WE. Cytosolic iron-sulfur cluster assembly (CIA) system: factors, mechanism, and relevance to cellular iron regulation. J Biol Chem 2010; 285:26745-26751. [PMID: 20522543 DOI: 10.1074/jbc.r110.122218] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
FeS cluster biogenesis is an essential process in virtually all forms of life. Complex protein machineries that are conserved from bacteria through higher eukaryotes facilitate assembly of the FeS cofactor in proteins. In the last several years, significant strides have been made in our understanding of FeS cluster assembly and the functional overlap of this process with cellular iron homeostasis. This minireview summarizes the present understanding of the cytosolic iron-sulfur cluster assembly (CIA) system in eukaryotes, with a focus on information gained from studies in budding yeast and mammalian systems.
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Affiliation(s)
- Anil K Sharma
- Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, Illinois 60612
| | - Leif J Pallesen
- Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, Illinois 60612
| | - Robert J Spang
- Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, Illinois 60612
| | - William E Walden
- Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, Illinois 60612.
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8
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Zhang Y, Lyver ER, Nakamaru-Ogiso E, Yoon H, Amutha B, Lee DW, Bi E, Ohnishi T, Daldal F, Pain D, Dancis A. Dre2, a conserved eukaryotic Fe/S cluster protein, functions in cytosolic Fe/S protein biogenesis. Mol Cell Biol 2008; 28:5569-82. [PMID: 18625724 PMCID: PMC2546940 DOI: 10.1128/mcb.00642-08] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2008] [Revised: 05/23/2008] [Accepted: 07/02/2008] [Indexed: 01/05/2023] Open
Abstract
In a forward genetic screen for interaction with mitochondrial iron carrier proteins in Saccharomyces cerevisiae, a hypomorphic mutation of the essential DRE2 gene was found to confer lethality when combined with Delta mrs3 and Delta mrs4. The dre2 mutant or Dre2-depleted cells were deficient in cytosolic Fe/S cluster protein activities while maintaining mitochondrial Fe/S clusters. The Dre2 amino acid sequence was evolutionarily conserved, and cysteine motifs (CX(2)CXC and twin CX(2)C) in human and yeast proteins were perfectly aligned. The human Dre2 homolog (implicated in blocking apoptosis and called CIAPIN1 or anamorsin) was able to complement the nonviability of a Deltadre2 deletion strain. The Dre2 protein with triple hemagglutinin tag was located in the cytoplasm and in the mitochondrial intermembrane space. Yeast Dre2 overexpressed and purified from bacteria was brown and exhibited signature absorption and electron paramagnetic resonance spectra, indicating the presence of both [2Fe-2S] and [4Fe-4S] clusters. Thus, Dre2 is an essential conserved Fe/S cluster protein implicated in extramitochondrial Fe/S cluster assembly, similar to other components of the so-called CIA (cytoplasmic Fe/S cluster assembly) pathway although partially localized to the mitochondrial intermembrane space.
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Affiliation(s)
- Yan Zhang
- Department of Medicine, Division of Hematology-Oncology, University of Pennsylvania, Philadelphia, PA 19104, USA
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Lill R, Mühlenhoff U. Maturation of Iron-Sulfur Proteins in Eukaryotes: Mechanisms, Connected Processes, and Diseases. Annu Rev Biochem 2008; 77:669-700. [DOI: 10.1146/annurev.biochem.76.052705.162653] [Citation(s) in RCA: 485] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Roland Lill
- Institut für Zytobiologie, Philipps Universität Marburg, Marburg D-35033, Germany;
| | - Ulrich Mühlenhoff
- Institut für Zytobiologie, Philipps Universität Marburg, Marburg D-35033, Germany;
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10
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Sprouty proteins, masterminds of receptor tyrosine kinase signaling. Angiogenesis 2008; 11:53-62. [PMID: 18219583 DOI: 10.1007/s10456-008-9089-1] [Citation(s) in RCA: 165] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2007] [Accepted: 01/07/2008] [Indexed: 01/07/2023]
Abstract
Angiogenesis relies on endothelial cells properly processing signals from growth factors provided in both an autocrine and a paracrine manner. These mitogens bind to their cognate receptor tyrosine kinases (RTKs) on the cell surface, thereby activating a myriad of complex intracellular signaling pathways whose outputs include cell growth, migration, and morphogenesis. Understanding how these cascades are precisely controlled will provide insight into physiological and pathological angiogenesis. The Sprouty (Spry) family of proteins is a highly conserved group of negative feedback loop modulators of growth factor-mediated mitogen-activated protein kinase (MAPK) activation originally described in Drosophila. There are four mammalian orthologs (Spry1-4) whose modulation of RTK-induced signaling pathways is growth factor- and cell context-dependent. Endothelial cells are a group of highly differentiated cell types necessary for defining the mammalian vasculature. These cells respond to a plethora of growth factors and express all four Spry isoforms, thus highlighting the complexity that is required to form and maintain vessels in mammals. This review describes Spry functions in the context of endothelial biology and angiogenesis, and provides an update on Spry-interacting proteins and Spry mechanisms of action.
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Ding W, Shi W, Bellusci S, Groffen J, Heisterkamp N, Minoo P, Warburton D. Sprouty2 downregulation plays a pivotal role in mediating crosstalk between TGF-beta1 signaling and EGF as well as FGF receptor tyrosine kinase-ERK pathways in mesenchymal cells. J Cell Physiol 2007; 212:796-806. [PMID: 17516543 DOI: 10.1002/jcp.21078] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mammalian Sprouty2 (Spry2) is a key regulator of the receptor tyrosine kinase/ERK signaling pathway and is involved in many biological processes, including cell growth, differentiation, migration, and embryonic lung branching morphogenesis. Previous studies have shown that Spry2 expression is upregulated by many mitogens, particularly epidermal growth factor (EGF) and fibroblast growth factors (FGFs). In contrast, we report that transforming growth factor-beta1 (TGF-beta1), which stimulates the growth of quiescent Swiss 3T3 cells, induced a dose dependent decrease of mouse Spry2 protein level within 24-h of treatment, and this effect was mediated by a MAP kinase-independent pathway. A concomitant reduction of the level of Spry2 mRNA indicates the involvement of a transcriptional mechanism, which requires histone deacetylase (HDAC) activity and de novo protein synthesis. On the other hand, the turnover rate of Spry2 protein was increased by TGF-beta1 treatment, suggesting enhanced Spry2 degradation. Treatment with lysosomal inhibitors, but not proteasome inhibitors, prevented the degradation of Spry2, thus, indicating that the degradation of Spry2 is mediated through the lysosomal pathway in Swiss 3T3 cells. Furthermore, we demonstrate that TGF-beta1 signaling can modulate EGF and FGF-induced ERK-MAP kinase activation by controlling Spry2 expression and function. Moreover, rescue of the TGF-beta1-induced downregulation of Spry2 by gene over-expression led to inhibition of the mitogenic effect of TGF-beta1 in Swiss 3T3 cells. Together, the combined operation of transcriptional and post-translational mechanisms suggests that regulation of Spry2 is a crucial event and emphasizes the important role that Spry2 plays in controlling cell behaviors.
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Affiliation(s)
- Wei Ding
- Developmental Biology Program, Childrens Hospital Los Angeles Saban Research Institute, Los Angeles, CA 90027, USA.
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12
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Paik JH, Kollipara R, Chu G, Ji H, Xiao Y, Ding Z, Miao L, Tothova Z, Horner JW, Carrasco DR, Jiang S, Gilliland DG, Chin L, Wong WH, Castrillon DH, DePinho RA. FoxOs are lineage-restricted redundant tumor suppressors and regulate endothelial cell homeostasis. Cell 2007; 128:309-23. [PMID: 17254969 PMCID: PMC1855089 DOI: 10.1016/j.cell.2006.12.029] [Citation(s) in RCA: 843] [Impact Index Per Article: 49.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2006] [Revised: 10/16/2006] [Accepted: 12/26/2006] [Indexed: 12/15/2022]
Abstract
Activated phosphoinositide 3-kinase (PI3K)-AKT signaling appears to be an obligate event in the development of cancer. The highly related members of the mammalian FoxO transcription factor family, FoxO1, FoxO3, and FoxO4, represent one of several effector arms of PI3K-AKT signaling, prompting genetic analysis of the role of FoxOs in the neoplastic phenotypes linked to PI3K-AKT activation. While germline or somatic deletion of up to five FoxO alleles produced remarkably modest neoplastic phenotypes, broad somatic deletion of all FoxOs engendered a progressive cancer-prone condition characterized by thymic lymphomas and hemangiomas, demonstrating that the mammalian FoxOs are indeed bona fide tumor suppressors. Transcriptome and promoter analyses of differentially affected endothelium identified direct FoxO targets and revealed that FoxO regulation of these targets in vivo is highly context-specific, even in the same cell type. Functional studies validated Sprouty2 and PBX1, among others, as FoxO-regulated mediators of endothelial cell morphogenesis and vascular homeostasis.
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Affiliation(s)
- Ji-Hye Paik
- Department of Medical Oncology, Dana-Farber Cancer Institute, Brigham and Women's Hospital, and Harvard Medical School, Boston, MA 02115, USA
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13
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Koumenis C, Maxwell PH. Low oxygen stimulates the intellect. Symposium on hypoxia and development, physiology and disease. EMBO Rep 2006; 7:679-84. [PMID: 16799463 PMCID: PMC1500837 DOI: 10.1038/sj.embor.7400733] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2006] [Accepted: 05/16/2006] [Indexed: 12/18/2022] Open
Affiliation(s)
- Constantinos Koumenis
- Department of Radiation Oncology, Cancer Biology and Neurosurgery, Comprehensive Cancer Center, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA
Tel: +1 336 713 7637; Fax: +1 336 713 7639;
| | - Patrick H. Maxwell
- Hammersmith Campus, Imperial College, Du Cane Road, London W12 0NN, UK
Tel: +44 (0)20 8383 8594; Fax: +44 (0)20 8383 2062;
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Cabrita MA, Jäggi F, Widjaja SP, Christofori G. A functional interaction between sprouty proteins and caveolin-1. J Biol Chem 2006; 281:29201-12. [PMID: 16877379 DOI: 10.1074/jbc.m603921200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Growth factor-mediated signal transduction cascades can be regulated spatio-temporally by signaling modulators, such as Sprouty proteins. The four mammalian Sprouty family members are palmitoylated phosphoproteins that can attenuate or potentiate numerous growth factor-induced signaling pathways. Previously, we have shown that Sprouty-1 and Sprouty-2 associate with Caveolin-1, the major structural protein of caveolae. Like Sprouty, Caveolin-1 inhibits growth factor-induced mitogen-activated protein kinase activation. Here, we demonstrate that all four mammalian Sprouty family members physically interact with Caveolin-1. The C terminus of Caveolin-1 is the major Sprouty-binding site, whereas Sprouty binds Caveolin-1 via its conserved C-terminal domain. A single point mutation in this domain results in loss of Caveolin-1 interaction. Moreover, we demonstrate that the various Sprouty isoforms differ dramatically in their cooperation with Caveolin-1-mediated inhibition of mitogen-activated protein kinase activation and that such cooperation is also highly dependent on the type of growth factor investigated and on cell density. Together, the data suggest that the Sprouty/Caveolin-1 interaction modulates signaling in a growth factor- and Sprouty isoform-specific manner.
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Affiliation(s)
- Miguel A Cabrita
- Institute of Biochemistry and Genetics, Department of Clinical-Biological Sciences, Center of Biomedicine, University of Basel, Mattenstrasse 28, 4058 Basel, Switzerland
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15
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Mason JM, Morrison DJ, Basson MA, Licht JD. Sprouty proteins: multifaceted negative-feedback regulators of receptor tyrosine kinase signaling. Trends Cell Biol 2005; 16:45-54. [PMID: 16337795 DOI: 10.1016/j.tcb.2005.11.004] [Citation(s) in RCA: 343] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2005] [Revised: 10/13/2005] [Accepted: 11/16/2005] [Indexed: 11/26/2022]
Abstract
Receptor tyrosine kinases (RTKs) control a wide variety of processes in multicellular organisms, including proliferation, differentiation, migration and survival. Their activity is tightly controlled through the coordinated action of both positive and negative regulators that function at multiple levels of the signal transduction cascade, and at different time points within the growth-factor-induced response. When this process goes awry, the outcome can be developmental defects and malignancy. Sprouty (Spry) proteins represent a major class of ligand-inducible inhibitors of RTK-dependent signaling pathways. New biochemical and genetic evidence indicates specific roles of the Spry genes in development and multiple modes of action of the Spry proteins in regulation of the RTK-induced response.
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Affiliation(s)
- Jacqueline M Mason
- Mount Sinai School of Medicine, Department of Medicine, Division of Hematology and Oncology, Box 1079, One Gustave L. Levy Place, New York, NY 10029, USA
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