Nitric oxide increases IL-8 gene transcription and mRNA stability to enhance IL-8 gene expression in lung epithelial cells
- 1 October 2004
- journal article
- Published by American Physiological Society in American Journal of Physiology-Lung Cellular and Molecular Physiology
- Vol. 287 (4) , L764-L773
- https://doi.org/10.1152/ajplung.00165.2004
Abstract
Interleukin (IL)-8, a C-X-C chemokine, is a potent chemoattractant and an activator for neutrophils, T cells, and other immune cells. The airway and respiratory epithelia play important roles in the initiation and modulation of inflammatory responses via production of cytokines and surfactant. The association between elevated levels of nitric oxide (NO) and IL-8 in acute lung injury associated with sepsis, acute respiratory distress syndrome, respiratory syncytial virus infection in infants, and other inflammatory diseases suggested that NO may play important roles in the control of IL-8 gene expression in the lung. We investigated the role of NO in the control of IL-8 gene expression in H441 lung epithelial cells. We found that a variety of NO donors significantly induced IL-8 mRNA levels, and the increase in IL-8 mRNA was associated with an increase in IL-8 protein. NO induction of IL-8 mRNA was due to increases in IL-8 gene transcription and mRNA stability. NO induction of IL-8 mRNA levels was not inhibited by 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one and KT-5823, inhibitors of soluble guanylate cyclase and protein kinase G, respectively, and 8-bromo-cGMP did not increase IL-8 mRNA levels. This indicated that NO induces IL-8 mRNA levels independently of changes in the intracellular cGMP levels. NO induction of IL-8 mRNA was significantly reduced by inhibitors of extracellular regulated kinase and protein kinase C. IL-8 induction by NO was also reduced by hydroxyl radical scavengers such as dimethyl sulfoxide and dimethylthiourea, indicating the involvement of hydroxyl radicals in the induction process. NO induction of IL-8 gene expression could be a significant contributing factor in the initiation and induction of inflammatory response in the respiratory epithelium.Keywords
This publication has 56 references indexed in Scilit:
- The antioxidant action of N-acetylcysteine: Its reaction with hydrogen peroxide, hydroxyl radical, superoxide, and hypochlorous acidPublished by Elsevier ,2003
- The Acute Respiratory Distress SyndromeNew England Journal of Medicine, 2000
- Chemokines: Function, Regulation and Alteration of Inflammatory ResponsesPublished by S. Karger AG ,1999
- Approaches to Define Pathways of Redox Regulation of a Eukaryotic Gene: The Heme Oxygenase 1 ExampleMethods, 1997
- Nitric Oxide Increases Tumor Necrosis Factor Production in Differentiated U937 Cells by Decreasing Cyclic AMPJournal of Biological Chemistry, 1997
- Nasal Cytokine Production In Viral Acute Upper Respiratory Infection Of ChildhoodThe Journal of Infectious Diseases, 1995
- Analysis of cells obtained by bronchial lavage of infants with respiratory syncytial virus infection.Archives of Disease in Childhood, 1994
- Inhibition of NF-κB by Sodium Salicylate and AspirinScience, 1994
- Novel Pseudomonas product stimulates interleukin-8 production in airway epithelial cells in vitro.Journal of Clinical Investigation, 1994
- Interleukin 8 (IL-8) in the bronchoalveolar lavage fluid from patients with the adult respiratory distress syndrome (ARDS) and patients at risk for ARDSCytokine, 1992