Corticosteroids and antigen avoidance decrease airway smooth muscle mass in an equine asthma model

Recent studies suggest that airway smooth muscle remodeling is an early event in the course of asthma. Little is known of the effects of long-term antigen avoidance and inhaled corticosteroids on chronically established airway remodeling. We sought to measure the effects of inhaled corticosteroids a...

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Veröffentlicht in:American journal of respiratory cell and molecular biology 2012-11, Vol.47 (5), p.589-596
Hauptverfasser: Leclere, Mathilde, Lavoie-Lamoureux, Anouk, Joubert, Philippe, Relave, Fabien, Setlakwe, Emilie Lanctot, Beauchamp, Guy, Couture, Christian, Martin, James G, Lavoie, Jean-Pierre
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container_issue 5
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container_title American journal of respiratory cell and molecular biology
container_volume 47
creator Leclere, Mathilde
Lavoie-Lamoureux, Anouk
Joubert, Philippe
Relave, Fabien
Setlakwe, Emilie Lanctot
Beauchamp, Guy
Couture, Christian
Martin, James G
Lavoie, Jean-Pierre
description Recent studies suggest that airway smooth muscle remodeling is an early event in the course of asthma. Little is known of the effects of long-term antigen avoidance and inhaled corticosteroids on chronically established airway remodeling. We sought to measure the effects of inhaled corticosteroids and antigen avoidance on airway remodeling in the peripheral airways of horses with heaves, a naturally occurring asthma-like disease. Heaves-affected adult horses with ongoing airway inflammation and bronchoconstriction were treated with fluticasone propionate (with and without concurrent antigen avoidance) (n = 6) or with antigen avoidance alone (n = 5). Lung function and bronchoalveolar lavage were performed at multiple time points, and peripheral lung biopsies were collected before and after 6 and 12 months of treatment. Lung function improved more quickly with inhaled corticosteroids, but eventually normalized in both groups. Inflammation was better controlled with antigen avoidance. During the study period, corrected smooth muscle mass decreased from 12.1 ± 2.8 × 10(-3) and 11.3 ± 1.2 × 10(-3) to 8.3 ± 1.4 × 10(-3) and 7.9 ± 1.0 × 10(-3) in the antigen avoidance and fluticasone groups, respectively (P = 0.03). At 6 months, smooth muscle mass was significantly smaller compared with baseline only in the fluticasone-treated animals. The subepithelial collagen area was lower at 12 months than at baseline in both groups. During the study period, airway smooth muscle remodeling decreased by approximately 30% in both groups, although the decrease was faster in horses receiving inhaled corticosteroids. Inhaled corticosteroids may accelerate the reversal of smooth muscle remodeling, even if airway inflammation is better controlled with antigen avoidance.
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Little is known of the effects of long-term antigen avoidance and inhaled corticosteroids on chronically established airway remodeling. We sought to measure the effects of inhaled corticosteroids and antigen avoidance on airway remodeling in the peripheral airways of horses with heaves, a naturally occurring asthma-like disease. Heaves-affected adult horses with ongoing airway inflammation and bronchoconstriction were treated with fluticasone propionate (with and without concurrent antigen avoidance) (n = 6) or with antigen avoidance alone (n = 5). Lung function and bronchoalveolar lavage were performed at multiple time points, and peripheral lung biopsies were collected before and after 6 and 12 months of treatment. Lung function improved more quickly with inhaled corticosteroids, but eventually normalized in both groups. Inflammation was better controlled with antigen avoidance. During the study period, corrected smooth muscle mass decreased from 12.1 ± 2.8 × 10(-3) and 11.3 ± 1.2 × 10(-3) to 8.3 ± 1.4 × 10(-3) and 7.9 ± 1.0 × 10(-3) in the antigen avoidance and fluticasone groups, respectively (P = 0.03). At 6 months, smooth muscle mass was significantly smaller compared with baseline only in the fluticasone-treated animals. The subepithelial collagen area was lower at 12 months than at baseline in both groups. During the study period, airway smooth muscle remodeling decreased by approximately 30% in both groups, although the decrease was faster in horses receiving inhaled corticosteroids. 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Little is known of the effects of long-term antigen avoidance and inhaled corticosteroids on chronically established airway remodeling. We sought to measure the effects of inhaled corticosteroids and antigen avoidance on airway remodeling in the peripheral airways of horses with heaves, a naturally occurring asthma-like disease. Heaves-affected adult horses with ongoing airway inflammation and bronchoconstriction were treated with fluticasone propionate (with and without concurrent antigen avoidance) (n = 6) or with antigen avoidance alone (n = 5). Lung function and bronchoalveolar lavage were performed at multiple time points, and peripheral lung biopsies were collected before and after 6 and 12 months of treatment. Lung function improved more quickly with inhaled corticosteroids, but eventually normalized in both groups. Inflammation was better controlled with antigen avoidance. 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Little is known of the effects of long-term antigen avoidance and inhaled corticosteroids on chronically established airway remodeling. We sought to measure the effects of inhaled corticosteroids and antigen avoidance on airway remodeling in the peripheral airways of horses with heaves, a naturally occurring asthma-like disease. Heaves-affected adult horses with ongoing airway inflammation and bronchoconstriction were treated with fluticasone propionate (with and without concurrent antigen avoidance) (n = 6) or with antigen avoidance alone (n = 5). Lung function and bronchoalveolar lavage were performed at multiple time points, and peripheral lung biopsies were collected before and after 6 and 12 months of treatment. Lung function improved more quickly with inhaled corticosteroids, but eventually normalized in both groups. Inflammation was better controlled with antigen avoidance. During the study period, corrected smooth muscle mass decreased from 12.1 ± 2.8 × 10(-3) and 11.3 ± 1.2 × 10(-3) to 8.3 ± 1.4 × 10(-3) and 7.9 ± 1.0 × 10(-3) in the antigen avoidance and fluticasone groups, respectively (P = 0.03). At 6 months, smooth muscle mass was significantly smaller compared with baseline only in the fluticasone-treated animals. The subepithelial collagen area was lower at 12 months than at baseline in both groups. During the study period, airway smooth muscle remodeling decreased by approximately 30% in both groups, although the decrease was faster in horses receiving inhaled corticosteroids. Inhaled corticosteroids may accelerate the reversal of smooth muscle remodeling, even if airway inflammation is better controlled with antigen avoidance.</abstract><cop>United States</cop><pub>American Thoracic Society</pub><pmid>22721832</pmid><doi>10.1165/rcmb.2011-0363OC</doi><tpages>8</tpages></addata></record>
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subjects Administration, Inhalation
Adrenal Cortex Hormones - administration & dosage
Adrenal Cortex Hormones - pharmacology
Airway Remodeling - drug effects
Airway Resistance
Androstadienes - administration & dosage
Androstadienes - pharmacology
Animals
Antigens, Plant - immunology
Asthma - drug therapy
Asthma - immunology
Asthma - pathology
Asthma - veterinary
Bronchioles - immunology
Bronchioles - pathology
Bronchoalveolar Lavage Fluid
Bronchodilator Agents - administration & dosage
Bronchodilator Agents - pharmacology
Cell Proliferation
Collagen - metabolism
Cytokines - metabolism
Fluticasone
Horse Diseases - drug therapy
Horse Diseases - immunology
Horse Diseases - pathology
Horses
Inflammation Mediators - metabolism
Lung - drug effects
Lung - pathology
Lung - physiopathology
Monocytes - metabolism
Muscle, Smooth - pathology
Organ Size - drug effects
Proliferating Cell Nuclear Antigen - metabolism
Respiratory Function Tests
Respiratory Mucosa - metabolism
Respiratory Mucosa - pathology
Treatment Outcome
title Corticosteroids and antigen avoidance decrease airway smooth muscle mass in an equine asthma model
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