IGFBP-5 Promotes Fibrosis Independently of Its Translocation to the Nucleus and Its Interaction with Nucleolin and IGF

Insulin-like growth factor binding protein (IGFBP)-5 levels are increased in systemic sclerosis (SSc) skin and lung. We previously reported that IGFBP-5 is a pro-fibrotic factor that induces extracellular matrix (ECM) production and deposition. Since IGFBP-5 contains a nuclear localization signal (N...

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Veröffentlicht in:PloS one 2015-06, Vol.10 (6), p.e0130546-e0130546
Hauptverfasser: Su, Yunyun, Nishimoto, Tetsuya, Feghali-Bostwick, Carol
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description Insulin-like growth factor binding protein (IGFBP)-5 levels are increased in systemic sclerosis (SSc) skin and lung. We previously reported that IGFBP-5 is a pro-fibrotic factor that induces extracellular matrix (ECM) production and deposition. Since IGFBP-5 contains a nuclear localization signal (NLS) that facilitates its nuclear translocation, we sought to examine the role of nuclear translocation on the fibrotic activity of IGFBP-5 and identify IGFBP-5 binding partners relevant for its nuclear compartmentalization. We generated functional wild type IGFBP-5 and IGFBP-5 with a mutated NLS or a mutated IGF binding site. Abrogation of nuclear translocation in the NLS mutant was confirmed using immunofluorescence and immunoblotting of nuclear and cytoplasmic cellular extracts. Abrogation of IGF binding was confirmed using western ligand blot. The fibrotic activity of wild type and mutant IGFBP-5 was examined in vitro in primary human fibroblasts and ex vivo in human skin. We identified IGFBP-5 binding partners using immunoprecipitation and mass spectrometry. We examined the effect of nucleolin on IGFBP-5 localization and function via sequence-specific silencing in primary human fibroblasts. Our results show that IGFBP-5-induced ECM production in vitro in primary human fibroblasts is independent of its nuclear translocation. The NLS-mutant also induced fibrosis ex vivo in human skin, thus confirming and extending the in vitro findings. Similar findings were obtained with the IGF-binding mutant. Nucleolin, a nucleolar protein that can serve as a nuclear receptor, was identified as an IGFBP-5 binding partner. Silencing nucleolin reduced IGFBP-5 translocation to the nucleus but did not block the ability of IGFBP-5 to induce ECM production and a fibrotic phenotype. IGFBP-5 transport to the nucleus requires an intact NLS and nucleolin. However, nuclear translocation is not necessary for IGFBP-5 fibrotic activity; neither is IGF binding. Our data provide further insights into the role of cellular compartmentalization in IGFBP-5-induced fibrosis.
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We previously reported that IGFBP-5 is a pro-fibrotic factor that induces extracellular matrix (ECM) production and deposition. Since IGFBP-5 contains a nuclear localization signal (NLS) that facilitates its nuclear translocation, we sought to examine the role of nuclear translocation on the fibrotic activity of IGFBP-5 and identify IGFBP-5 binding partners relevant for its nuclear compartmentalization. We generated functional wild type IGFBP-5 and IGFBP-5 with a mutated NLS or a mutated IGF binding site. Abrogation of nuclear translocation in the NLS mutant was confirmed using immunofluorescence and immunoblotting of nuclear and cytoplasmic cellular extracts. Abrogation of IGF binding was confirmed using western ligand blot. The fibrotic activity of wild type and mutant IGFBP-5 was examined in vitro in primary human fibroblasts and ex vivo in human skin. We identified IGFBP-5 binding partners using immunoprecipitation and mass spectrometry. We examined the effect of nucleolin on IGFBP-5 localization and function via sequence-specific silencing in primary human fibroblasts. Our results show that IGFBP-5-induced ECM production in vitro in primary human fibroblasts is independent of its nuclear translocation. The NLS-mutant also induced fibrosis ex vivo in human skin, thus confirming and extending the in vitro findings. Similar findings were obtained with the IGF-binding mutant. Nucleolin, a nucleolar protein that can serve as a nuclear receptor, was identified as an IGFBP-5 binding partner. Silencing nucleolin reduced IGFBP-5 translocation to the nucleus but did not block the ability of IGFBP-5 to induce ECM production and a fibrotic phenotype. IGFBP-5 transport to the nucleus requires an intact NLS and nucleolin. However, nuclear translocation is not necessary for IGFBP-5 fibrotic activity; neither is IGF binding. 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Nishimoto, Tetsuya ; Feghali-Bostwick, Carol</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c692t-f0c411ff3ff8c3e139302e508eea1d561a833a94e63b617ef63f92fa8be6df5a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Adenoviruses</topic><topic>Binding sites</topic><topic>Biochemistry</topic><topic>Breast cancer</topic><topic>Cell Nucleus - metabolism</topic><topic>Extracellular matrix</topic><topic>Fibroblasts</topic><topic>Fibrosis</topic><topic>HIV</topic><topic>Human immunodeficiency virus</topic><topic>Humans</topic><topic>Immunoblotting</topic><topic>Immunofluorescence</topic><topic>Immunology</topic><topic>Immunoprecipitation</topic><topic>Infections</topic><topic>Insulin</topic><topic>Insulin-Like Growth Factor Binding Protein 5 - genetics</topic><topic>Insulin-Like Growth Factor Binding Protein 5 - physiology</topic><topic>Insulin-like growth factor-binding protein 5</topic><topic>Insulin-like growth factors</topic><topic>Localization</topic><topic>Lungs</topic><topic>Mass spectrometry</topic><topic>Mass spectroscopy</topic><topic>Medicine</topic><topic>Mutants</topic><topic>Nuclear transport</topic><topic>Nuclei</topic><topic>Nucleoli</topic><topic>Nucleolin</topic><topic>Phenotypes</topic><topic>Phosphoproteins - metabolism</topic><topic>Protein binding</topic><topic>Protein Transport</topic><topic>Proteins</topic><topic>Rheumatology</topic><topic>RNA-Binding Proteins - metabolism</topic><topic>Scleroderma</topic><topic>Scleroderma (Disease)</topic><topic>Skin</topic><topic>Smooth muscle</topic><topic>Somatomedins - metabolism</topic><topic>Systemic sclerosis</topic><topic>Translocation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Su, Yunyun</creatorcontrib><creatorcontrib>Nishimoto, Tetsuya</creatorcontrib><creatorcontrib>Feghali-Bostwick, Carol</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Gale In Context: Opposing Viewpoints</collection><collection>Gale In Context: Science</collection><collection>ProQuest Central (Corporate)</collection><collection>Animal Behavior Abstracts</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Biotechnology Research Abstracts</collection><collection>Nursing &amp; 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We previously reported that IGFBP-5 is a pro-fibrotic factor that induces extracellular matrix (ECM) production and deposition. Since IGFBP-5 contains a nuclear localization signal (NLS) that facilitates its nuclear translocation, we sought to examine the role of nuclear translocation on the fibrotic activity of IGFBP-5 and identify IGFBP-5 binding partners relevant for its nuclear compartmentalization. We generated functional wild type IGFBP-5 and IGFBP-5 with a mutated NLS or a mutated IGF binding site. Abrogation of nuclear translocation in the NLS mutant was confirmed using immunofluorescence and immunoblotting of nuclear and cytoplasmic cellular extracts. Abrogation of IGF binding was confirmed using western ligand blot. The fibrotic activity of wild type and mutant IGFBP-5 was examined in vitro in primary human fibroblasts and ex vivo in human skin. We identified IGFBP-5 binding partners using immunoprecipitation and mass spectrometry. We examined the effect of nucleolin on IGFBP-5 localization and function via sequence-specific silencing in primary human fibroblasts. Our results show that IGFBP-5-induced ECM production in vitro in primary human fibroblasts is independent of its nuclear translocation. The NLS-mutant also induced fibrosis ex vivo in human skin, thus confirming and extending the in vitro findings. Similar findings were obtained with the IGF-binding mutant. Nucleolin, a nucleolar protein that can serve as a nuclear receptor, was identified as an IGFBP-5 binding partner. Silencing nucleolin reduced IGFBP-5 translocation to the nucleus but did not block the ability of IGFBP-5 to induce ECM production and a fibrotic phenotype. IGFBP-5 transport to the nucleus requires an intact NLS and nucleolin. However, nuclear translocation is not necessary for IGFBP-5 fibrotic activity; neither is IGF binding. Our data provide further insights into the role of cellular compartmentalization in IGFBP-5-induced fibrosis.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>26103640</pmid><doi>10.1371/journal.pone.0130546</doi><oa>free_for_read</oa></addata></record>
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subjects Adenoviruses
Binding sites
Biochemistry
Breast cancer
Cell Nucleus - metabolism
Extracellular matrix
Fibroblasts
Fibrosis
HIV
Human immunodeficiency virus
Humans
Immunoblotting
Immunofluorescence
Immunology
Immunoprecipitation
Infections
Insulin
Insulin-Like Growth Factor Binding Protein 5 - genetics
Insulin-Like Growth Factor Binding Protein 5 - physiology
Insulin-like growth factor-binding protein 5
Insulin-like growth factors
Localization
Lungs
Mass spectrometry
Mass spectroscopy
Medicine
Mutants
Nuclear transport
Nuclei
Nucleoli
Nucleolin
Phenotypes
Phosphoproteins - metabolism
Protein binding
Protein Transport
Proteins
Rheumatology
RNA-Binding Proteins - metabolism
Scleroderma
Scleroderma (Disease)
Skin
Smooth muscle
Somatomedins - metabolism
Systemic sclerosis
Translocation
title IGFBP-5 Promotes Fibrosis Independently of Its Translocation to the Nucleus and Its Interaction with Nucleolin and IGF
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