Cargando…

Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions

BACKGROUND: Osteopontin (OPN) is a member of the small integrin-binding ligand N-linked glycoprotein (SIBLING) family and a cytokine with diverse biologic roles. OPN undergoes extensive post-translational modifications, including polymerization and proteolytic fragmentation, which alters its biologi...

Descripción completa

Detalles Bibliográficos
Autores principales: Arjomandi, Mehrdad, Frelinger, Jessica, Donde, Aneesh, Wong, Hofer, Yellamilli, Amritha, Raymond, Wilfred
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3198733/
https://www.ncbi.nlm.nih.gov/pubmed/22031818
http://dx.doi.org/10.1371/journal.pone.0025678
_version_ 1782214482210062336
author Arjomandi, Mehrdad
Frelinger, Jessica
Donde, Aneesh
Wong, Hofer
Yellamilli, Amritha
Raymond, Wilfred
author_facet Arjomandi, Mehrdad
Frelinger, Jessica
Donde, Aneesh
Wong, Hofer
Yellamilli, Amritha
Raymond, Wilfred
author_sort Arjomandi, Mehrdad
collection PubMed
description BACKGROUND: Osteopontin (OPN) is a member of the small integrin-binding ligand N-linked glycoprotein (SIBLING) family and a cytokine with diverse biologic roles. OPN undergoes extensive post-translational modifications, including polymerization and proteolytic fragmentation, which alters its biologic activity. Recent studies suggest that OPN may contribute to the pathogenesis of asthma. METHODOLOGY: To determine whether secreted OPN (sOPN) is polymerized in human airways and whether it is qualitatively different in asthma, we used immunoblotting to examine sOPN in bronchoalveolar lavage (BAL) fluid samples from 12 healthy and 21 asthmatic subjects (and in sputum samples from 27 healthy and 21 asthmatic subjects). All asthmatic subjects had mild to moderate asthma and abstained from corticosteroids during the study. Furthermore, we examined the relationship between airway sOPN and cellular inflammation. PRINCIPAL FINDINGS: We found that sOPN in BAL fluid and sputum exists in polymeric, monomeric, and cleaved forms, with most of it in polymeric form. Compared to healthy subjects, asthmatic subjects had proportionately less polymeric sOPN and more monomeric and cleaved sOPN. Polymeric sOPN in BAL fluid was associated with increased alveolar macrophage counts in airways in all subjects. CONCLUSIONS: These results suggest that sOPN in human airways (1) undergoes extensive post-translational modification by polymerization and proteolytic fragmentation, (2) is more fragmented and less polymerized in subjects with mild to moderate asthma, and (3) may contribute to recruitment or survival of alveolar macrophages.
format Online
Article
Text
id pubmed-3198733
institution National Center for Biotechnology Information
language English
publishDate 2011
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-31987332011-10-26 Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions Arjomandi, Mehrdad Frelinger, Jessica Donde, Aneesh Wong, Hofer Yellamilli, Amritha Raymond, Wilfred PLoS One Research Article BACKGROUND: Osteopontin (OPN) is a member of the small integrin-binding ligand N-linked glycoprotein (SIBLING) family and a cytokine with diverse biologic roles. OPN undergoes extensive post-translational modifications, including polymerization and proteolytic fragmentation, which alters its biologic activity. Recent studies suggest that OPN may contribute to the pathogenesis of asthma. METHODOLOGY: To determine whether secreted OPN (sOPN) is polymerized in human airways and whether it is qualitatively different in asthma, we used immunoblotting to examine sOPN in bronchoalveolar lavage (BAL) fluid samples from 12 healthy and 21 asthmatic subjects (and in sputum samples from 27 healthy and 21 asthmatic subjects). All asthmatic subjects had mild to moderate asthma and abstained from corticosteroids during the study. Furthermore, we examined the relationship between airway sOPN and cellular inflammation. PRINCIPAL FINDINGS: We found that sOPN in BAL fluid and sputum exists in polymeric, monomeric, and cleaved forms, with most of it in polymeric form. Compared to healthy subjects, asthmatic subjects had proportionately less polymeric sOPN and more monomeric and cleaved sOPN. Polymeric sOPN in BAL fluid was associated with increased alveolar macrophage counts in airways in all subjects. CONCLUSIONS: These results suggest that sOPN in human airways (1) undergoes extensive post-translational modification by polymerization and proteolytic fragmentation, (2) is more fragmented and less polymerized in subjects with mild to moderate asthma, and (3) may contribute to recruitment or survival of alveolar macrophages. Public Library of Science 2011-10-21 /pmc/articles/PMC3198733/ /pubmed/22031818 http://dx.doi.org/10.1371/journal.pone.0025678 Text en This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication. https://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.
spellingShingle Research Article
Arjomandi, Mehrdad
Frelinger, Jessica
Donde, Aneesh
Wong, Hofer
Yellamilli, Amritha
Raymond, Wilfred
Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions
title Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions
title_full Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions
title_fullStr Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions
title_full_unstemmed Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions
title_short Secreted Osteopontin Is Highly Polymerized in Human Airways and Fragmented in Asthmatic Airway Secretions
title_sort secreted osteopontin is highly polymerized in human airways and fragmented in asthmatic airway secretions
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3198733/
https://www.ncbi.nlm.nih.gov/pubmed/22031818
http://dx.doi.org/10.1371/journal.pone.0025678
work_keys_str_mv AT arjomandimehrdad secretedosteopontinishighlypolymerizedinhumanairwaysandfragmentedinasthmaticairwaysecretions
AT frelingerjessica secretedosteopontinishighlypolymerizedinhumanairwaysandfragmentedinasthmaticairwaysecretions
AT dondeaneesh secretedosteopontinishighlypolymerizedinhumanairwaysandfragmentedinasthmaticairwaysecretions
AT wonghofer secretedosteopontinishighlypolymerizedinhumanairwaysandfragmentedinasthmaticairwaysecretions
AT yellamilliamritha secretedosteopontinishighlypolymerizedinhumanairwaysandfragmentedinasthmaticairwaysecretions
AT raymondwilfred secretedosteopontinishighlypolymerizedinhumanairwaysandfragmentedinasthmaticairwaysecretions