Journal
AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE
Volume 182, Issue 8, Pages 1020-1029Publisher
AMER THORACIC SOC
DOI: 10.1164/rccm.201001-0055OC
Keywords
chronic obstructive pulmonary disease; miR-146a; prostaglandin E-2, cyclooxygenase-2, fibroblasts
Categories
Funding
- National Heart Lung Blood Institute [RO1-064088]
- Pulmonary Section, Department of Internal Medicine
- Chancellor's office
- Larson Endowment of the University of Nebraska Medical Center
- Uehara Memorial Foundation
- Japanese Respiratory Research Foundation
- Pfizer
- University of Nebraska Medical Center Microarray Core
- National Institutes of Health [P20 RR016469]
- National Center for Research Resources
- Aerocrine
- Roche
- German Retirement Fund
- Boehringer Ingelheim
- AstraZeneca
- Chiesi
- Altana
- Almiral
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Rationale: Persistent inflammation plays a major role in chronic obstructive pulmonary disease (COPD) pathogenesis, but its mechanisms are incompletely defined. Overproduction of the inflammatory mediator prostaglandin (PG) E-2 by COPD fibroblasts contributes to reduced repair function. Objectives: The present study determined if fibroblasts from subjects with COPD overproduce PGE(2) after stimulation with the inflammatory cytokines IL-1 beta and tumor necrosis factor-alpha, and further defined the mechanism for overproduction. Methods: Fibroblasts were isolated from parenchymal tissue obtained from smokers with and without COPD undergoing lung surgery. PGE(2), cyclooxygenases (COX), and miR-146a in these cells were evaluated by in vitro studies. Measurements and Main Results: After stimulation with inflammatory cytokines, COPD fibroblasts produced 2.7-fold more PGE(2) compared with controls with similar smoking history. The increase in PGE(2) depended on induction of COX-2, which increased to a greater degree in fibroblasts from subjects with COPD. Cytokines also induced microRNA miR-146a expression in both fibroblasts, but significantly less in COPD fibroblasts. miR-146a caused degradation of COX-2 mRNA; reduced expression prolonged COX-2 mRNA half-life in fibroblasts from subjects with COPD. Cytokine-stimulated PGE(2) production and miR-146a expression in cultured fibroblasts correlated with clinical severity assessed by expiratory airflow and diffusion capacity. Conclusions: miR-146a seems to play a pathogenetic role in the abnormal inflammatory response in COPD. Increased half-life of inflammatory mRNAs is a mechanism of abnormal inflammation in this disease.
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