tailieunhanh - Báo cáo y học: "Suppression of nitric oxide production from nasal fibroblasts by metabolized clarithromycin in vitro"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Suppression of nitric oxide production from nasal fibroblasts by metabolized clarithromycin in vitro. | Furuya et al. Journal of Inflammation 2010 7 56 http content 7 1 56 JOURNAL OF INFLAMMATION RESEARCH Open Access Suppression of nitric oxide production from nasal fibroblasts by metabolized clarithromycin in vitro 1 2 11 11 Ayako Furuya Kazuhito Asano Naruo Shoji Kojiro Hirano Taisuke Hamasaki Harumi Suzaki Abstract Background Low-dose and long-term administration of 14-membered macrolide antibiotics so called macrolide therapy has been reported to favorably modify the clinical conditions of chronic airway diseases. Since there is growing evidence that macrolide antibiotic-resistant bacteria s spreaders in the populations received macrolide therapy it is strongly desired to develop macrolide antibiotics which showed only anti-inflammatory action. The present study was designed to examine the influence of clarithromycin CAM and its metabolized materials M-1 M-4 and M-5 on free radical generation from nasal polyp fibroblasts NPFs through the choice of nitric oxide NO which is one of important effector molecule in the development of airway inflammatory disease in vitro. Methods NPFs 5 X 105 cells ml were stimulated with pg ml lipopolysaccharide LPS in the presence of agents for 24 hours. NO levels in culture supernatants were examined by the Griess method. We also examined the influence of agents on the phosphorylation of MAPKs NF-kB activation iNOS mRNA expression and iNOS production in NPFs cultured for 2 4 8 and 12 hours respectively. Results The addition of CAM pg ml and M-4 pg ml could suppress NO production from NPFs after LPS stimulation through the suppression of iNOS mRNA expression and NF-kB activation. CAM and M-4 also suppressed phosphorylation of MAPKs ERK and p38 MAPK but not JNK which are increased LPS stimulation. On the other hand M-1 and M-5 could not inhibit the NO generation even when pg ml of the agent was added to cell cultures. Conclusion The present results may suggest that M-4 will be a good .

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