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Macrolide antibiotics inhibit nitric oxide generation by rat pulmonary alveolar macrophages

K Kohri, J Tamaoki, M Kondo, K Aoshiba, E Tagaya, A Nagai
European Respiratory Journal 2000 15: 62-67; DOI: 10.1183/09031936.00.15106200
K Kohri
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J Tamaoki
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M Kondo
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K Aoshiba
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E Tagaya
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A Nagai
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Abstract

There is evidence that macrolide antibiotics are effective in the treatment of chronic airway inflammatory diseases, probably through actions other than their antibacterial properties. In order to determine whether macrolides affect the nitric oxide-generating system in the respiratory tract, rat pulmonary alveolar macrophages (PAMs) were studied in vitro. The release of NO was assessed by direct measurement with a specific amperometric sensor for this molecule, and the expression of type II NO synthase (NOS) messenger ribonucleic acid (mRNA) was determined by Northern blotting. Incubation of PAMs with lipopolysaccharide from Escherichia coli and recombinant human interferon-gamma caused release of NO, which was accompanied by induction of type II NOS mRNA. The release of NO was reduced by coincubation of cells with the macrolides erythromycin, clarithromycin and josamycin in a concentration-dependent manner, the maximal inhibition being 73+/-10, 81+/-6 and 84+/-9%, respectively, but was not altered by amoxycillin or cefaclor. These macrolides likewise inhibited the induction of type II NOS mRNA, whereas no inhibitory effects were observed with amoxycillin or cefaclor. These results suggest that macrolide antibiotics specifically inhibit type II NO synthase gene expression and consequently reduce NO production by rat pulmonary alveolar macrophages, which might result in attenuation of airway inflammation.

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Macrolide antibiotics inhibit nitric oxide generation by rat pulmonary alveolar macrophages
K Kohri, J Tamaoki, M Kondo, K Aoshiba, E Tagaya, A Nagai
European Respiratory Journal Jan 2000, 15 (1) 62-67; DOI: 10.1183/09031936.00.15106200

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Macrolide antibiotics inhibit nitric oxide generation by rat pulmonary alveolar macrophages
K Kohri, J Tamaoki, M Kondo, K Aoshiba, E Tagaya, A Nagai
European Respiratory Journal Jan 2000, 15 (1) 62-67; DOI: 10.1183/09031936.00.15106200
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