期刊
AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY
卷 295, 期 3, 页码 L505-L514出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajplung.00046.2008
关键词
human airway smooth muscle cells; asthma; inflammation; prostaglandin
资金
- Alberta Heritage Foundation
- Canadian Institutes of Health Research (CIHR)
- Medical Research Council [G0400503B] Funding Source: researchfish
In diseases such as asthma, airway smooth muscle (ASM) cells play a synthetic role by secreting inflammatory mediators such as granulocyte-macrophage colony-stimulating factor (GM-CSF), IL-6, or IL-8 and by expressing surface adhesion molecules, including ICAM-1. In the present study, PGE2, forskolin, and short- acting (salbutamol) and long-acting (salmeterol and formoterol) beta(2)-adrenoceptor agonists reduced the expression of ICAM-1 and the release of GM-CSF evoked by IL-1 beta in ASM cells. IL-1 beta-induced IL-8 release was also repressed by PGE2 and forskolin, whereas the beta(2)-adrenoceptor agonists were ineffective. In each case, repression of these inflammatory indexes was prevented by adenoviral overexpression of PKI alpha, a highly selective PKA inhibitor. These data indicate a PKA-dependent mechanism of repression and suggest that agents that elevate intracellular cAMP, and thereby activate PKA, may have a widespread anti-inflammatory effect in ASM cells. Since ICAM-1 and GM-CSF are highly NF-kappa B-dependent genes, we used an adenoviral-delivered NF-kappa B-dependent luciferase reporter to examine the effects of forskolin and the beta(2)-adrenoceptor agonists on NF-kappa B activation. There was no effect on luciferase activity measured in the presence of forskolin or beta(2)-adrenoceptor agonists. This finding is consistent with the observation that IL-1 beta-induced expression of IL-6, a known NF-kappa B-dependent gene in ASM, was also unaffected by beta(2)-adrenoceptor agonists, forskolin, PGE2, 8-bromo-cAMP, or rolipram. Collectively, these results indicate that repression of IL-1 beta-induced ICAM-1 expression and GM-CSF release by cAMP-elevating agents, including beta(2)-adrenoceptor agonists, may not occur through a generic effect on NF-kappa B.
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