title: Dissociation between the effects of oxygen and pressure on matrix metalloproteinase-2, -7, and -9 expression in human airway epithelial cells.
abstract: We tested the hypothesis that hyperoxia or pressure exposure differentially activates expression of cytokines and/or matrix modeling proteins in human airway epithelial cells. Calu-3 epithelial cell monolayers were cultured on transwell plates with the apical surface exposed to gas. Following establishment of baseline, plates were placed in a chamber and exposed to: control (21% O (2); atm), hyperoxia (60% O (2); atm), pressure (21% O (2); 40 cm H (2)O), and combination (60% O (2); 40 cm H (2)O). At 72 hour of exposure, monolayers were assessed for integrity, viability, and expression of interleukin (IL)-6, IL-8 and matrix metalloproteinases (MMPs) -2, -7, and -9. Compared with controls, hyperoxia had lower transepithelial resistance ( P < 0.001) and greater IL-6 secretion ( P < 0.01), and pressure had lower cell viability ( P < 0.001) and greater IL-8 secretion ( P < 0.001). Hyperoxia resulted in more latent MMP-2 ( P < 0.05) and MMP-7 ( P < 0.001). Pressure was associated with a rise in MMPs independent of oxygen exposure ( P < 0.05). Hyperoxia and pressure differentially affected MMP activities in Calu-3 cells and may lead to the different functional and structural abnormalities observed in these in vitro studies.
authors: Nemours Research Lung Center, Alfred I. duPont Hospital for Children, Wilmington, Delaware 19803, USA.
authors: Thomas L
authors: TL
authors: Miller
authors: Yan
authors: Y
authors: Zhu
authors: Sean
authors: S
authors: Markwardt
authors: Clifford J
authors: CJ
authors: Singhaus
authors: Aaron S
authors: AS
authors: Chidekel
authors: Thomas H
authors: TH
authors: Shaffer
mesh_terms: D001980:Bronchi / Q000166:cytology*; D002478:Cells, Cultured; D004847:Epithelial Cells / Q000378:metabolism*; D006801:Humans; D018496:Hyperoxia / Q000378:metabolism*; D007091:Image Processing, Computer-Assisted; D007150:Immunohistochemistry; D015850:Interleukin-6 / Q000032:analysis; D016209:Interleukin-8 / Q000032:analysis; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism*; D020783:Matrix Metalloproteinase 7 / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D011312:Pressure; D020545:Respiratory Mucosa / Q000276:immunology
chemical_list: D015850:Interleukin-6; D016209:Interleukin-8; D020783:Matrix Metalloproteinase 7; C522361:MMP2 protein, human; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9