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CCL2 release by airway smooth muscle is increased in asthma and promotes fibrocyte migration

Journal Article · · Allergy (Copenhagen)
DOI:https://doi.org/10.1111/all.12444· OSTI ID:1625861
 [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of Leicester (United Kingdom). Dept. of Infection, Immunity and Inflammation. Inst. for Lung Health; DOE/OSTI
  2. Univ. of Leicester (United Kingdom). Dept. of Infection, Immunity and Inflammation. Inst. for Lung Health
Background: Asthma is characterized by variable airflow obstruction, airway inflammation, airway hyper-responsiveness and airway remodelling. Airway smooth muscle (ASM) hyperplasia is a feature of airway remodelling and contributes to bronchial wall thickening. We sought to investigate the expression levels of chemokines in primary cultures of ASM cells from asthmatics vs healthy controls and to assess whether differentially expressed chemokines (i) promote fibrocyte (FC) migration towards ASM and (ii) are increased in blood from subjects with asthma and in sputum samples from those asthmatics with bronchial wall thickening. Methods: Chemokine concentrations released by primary ASM were measured by MesoScale Discovery platform. The chemokine most highly expressed by ASM from asthmatics compared with healthy controls was confirmed by ELISA, and expression of its cognate chemokine receptor by FCs was examined by immunofluorescence and flow cytometry. The role of this chemokine in FC migration towards ASM was investigated by chemotaxis assays. Results: Chemokine (C-C motif) ligand 2 (CCL2) levels were increased in primary ASM supernatants from asthmatics compared with healthy controls. CCR2 was expressed on FCs. Fibrocytes migrated towards recombinant CCL2 and ASM supernatants. These effects were inhibited by CCL2 neutralization. CCL2 levels were increased in blood from asthmatics compared with healthy controls, and sputum CCL2 was increased in asthmatics with bronchial wall thickening. Conclusions: Airway smooth muscle-derived CCL2 mediates FC migration and potentially contributes to the development of ASM hyperplasia in asthma.
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI ID:
1625861
Journal Information:
Allergy (Copenhagen), Journal Name: Allergy (Copenhagen) Journal Issue: 9 Vol. 69; ISSN 0105-4538
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

MicroRNA Regulation of Airway Inflammation and Airway Smooth Muscle Function: Relevance to Asthma: MICRORNA REGULATION OF AIRWAY INFLAMMATION journal August 2015
Fibrocyte-like cells mediate acquired resistance to anti-angiogenic therapy with bevacizumab journal December 2015
Histological Chorioamnionitis Induces Differential Gene Expression in Human Cord Blood Mononuclear Leukocytes from Term Neonates journal April 2019
Neonatal Streptococcus pneumoniae Pneumonia Induces an Aberrant Airway Smooth Muscle Phenotype and AHR in Mice Model journal January 2019
Fibrocytes are increased in lung and peripheral blood of patients with idiopathic pulmonary fibrosis journal May 2018
Increased Eotaxin and MCP-1 Levels in Serum from Individuals with Periodontitis and in Human Gingival Fibroblasts Exposed to Pro-Inflammatory Cytokines journal August 2015

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