目的探讨清金化痰汤调节慢性阻塞性肺疾病(COPD)模型大鼠气道黏液高分泌的作用机制。方法 Wistar大鼠随机分为正常组、模型组、清金化痰汤组与克拉霉素组,每组10只。除正常组外,其余3组均采用气管内注入脂多糖和烟熏复合法建立COPD模型...目的探讨清金化痰汤调节慢性阻塞性肺疾病(COPD)模型大鼠气道黏液高分泌的作用机制。方法 Wistar大鼠随机分为正常组、模型组、清金化痰汤组与克拉霉素组,每组10只。除正常组外,其余3组均采用气管内注入脂多糖和烟熏复合法建立COPD模型,分别给予生理盐水、清金化痰汤、克拉霉素灌胃,连续30 d。实验第31日,处死大鼠提取肺组织,每组随机选取6只,采用实时荧光定量PCR检测肺组织中性粒细胞弹性蛋白酶(NE)、表皮生长因子(EGFR)、黏蛋白5AC(MUC5AC)基因表达。结果模型组大鼠肺组织NE、MUC5AC m RNA表达较正常组升高;与模型组比较,清金化痰汤组、克拉霉素组NE、MUC5AC m RNA表达均显著降低,清金化痰汤组NE、MUC5AC m RNA表达较克拉霉素组显著降低;清金化痰汤组EGFR m RNA表达较模型组显著降低。结论清金化痰汤通过调节NE/EGFR/MUC5AC信号转导通路,抑制气道黏液高分泌。展开更多
Background Mucus hypersecretion in the respiratory tract and goblet cell metaplasia in the airway epithelium contribute to the morbidity and mortality associated with airway inflammatory diseases. This study aimed to ...Background Mucus hypersecretion in the respiratory tract and goblet cell metaplasia in the airway epithelium contribute to the morbidity and mortality associated with airway inflammatory diseases. This study aimed to examine the effect and mechanisms of simvastatin on airway mucus hypersecretion in rats treated with lipopolysaccharide （LPS）. Methods Mucus hypersecretion in rat airways was induced by intra-tracheal instillation of LPS. Rats treated with or without LPS were administered intra-peritoneally simvastatin （5 and 20 mg/kg） for 4 days. Expression of Muc5ac, RhoA and mitogen-activated protein kinases （MAPK） p38 in lung were detected by real-time polymerase chain reaction （PCR）, immunohistochemistry or Western blotting. Tumor necrosis factor （TNF）-α and IL-8 in bronchoalveolar lavage fluid （BALF） were assayed by an enzyme-linked lectin assay and enzyme linked immunosorbent assay （ELISA）. Results Simvastatin attenuated LPS-induced goblet cell hyperplasia in bronchial epithelium and Muc5ac hypersecretion at both the gene and protein levels in lung （P 〈0.05）. Moreover, simvastatin inhibited neutrophil accumulation and the increased concentration of TNF-α and IL-8 in BALF follows LPS stimulation （P 〈0.05）. The higher dose of simvastatin was associated with a more significant reduction in Muc5ac mRNA expression, neutrophil accumulation and inflammatory cytokine release. Simultaneously, the increased expression of RhoA and p38 MAPK were observed in LPS-treated lung （P 〈0.05）. Simvastatin inhibited the expression of RhoA and p38 phosphorylation in lung following LPS stimulation （P 〈0.05）. However, the increased expression of p38 protein in LPS-treated lung was not affected by simvastatin administration. Conclusions Simvastatin attenuates airway mucus hypersecretion and pulmonary inflammatory damage induced by LPS. The inhibitory effect of simvastatin on airway mucus hypersecretion may be through, at least in part, the suppression of neutrophil accumulation and 展开更多
文摘目的探讨清金化痰汤调节慢性阻塞性肺疾病(COPD)模型大鼠气道黏液高分泌的作用机制。方法 Wistar大鼠随机分为正常组、模型组、清金化痰汤组与克拉霉素组,每组10只。除正常组外,其余3组均采用气管内注入脂多糖和烟熏复合法建立COPD模型,分别给予生理盐水、清金化痰汤、克拉霉素灌胃,连续30 d。实验第31日,处死大鼠提取肺组织,每组随机选取6只,采用实时荧光定量PCR检测肺组织中性粒细胞弹性蛋白酶(NE)、表皮生长因子(EGFR)、黏蛋白5AC(MUC5AC)基因表达。结果模型组大鼠肺组织NE、MUC5AC m RNA表达较正常组升高;与模型组比较,清金化痰汤组、克拉霉素组NE、MUC5AC m RNA表达均显著降低,清金化痰汤组NE、MUC5AC m RNA表达较克拉霉素组显著降低;清金化痰汤组EGFR m RNA表达较模型组显著降低。结论清金化痰汤通过调节NE/EGFR/MUC5AC信号转导通路,抑制气道黏液高分泌。
基金This study was supported by grants from National Natural Science Foundation of China to Dr. WEN Fu-qing （No. 30425007, 30370627, 30670921） and from China Medical Board of New York to Dr. WEN Fu-qiang （No. 0-722）.
文摘Background Mucus hypersecretion in the respiratory tract and goblet cell metaplasia in the airway epithelium contribute to the morbidity and mortality associated with airway inflammatory diseases. This study aimed to examine the effect and mechanisms of simvastatin on airway mucus hypersecretion in rats treated with lipopolysaccharide （LPS）. Methods Mucus hypersecretion in rat airways was induced by intra-tracheal instillation of LPS. Rats treated with or without LPS were administered intra-peritoneally simvastatin （5 and 20 mg/kg） for 4 days. Expression of Muc5ac, RhoA and mitogen-activated protein kinases （MAPK） p38 in lung were detected by real-time polymerase chain reaction （PCR）, immunohistochemistry or Western blotting. Tumor necrosis factor （TNF）-α and IL-8 in bronchoalveolar lavage fluid （BALF） were assayed by an enzyme-linked lectin assay and enzyme linked immunosorbent assay （ELISA）. Results Simvastatin attenuated LPS-induced goblet cell hyperplasia in bronchial epithelium and Muc5ac hypersecretion at both the gene and protein levels in lung （P 〈0.05）. Moreover, simvastatin inhibited neutrophil accumulation and the increased concentration of TNF-α and IL-8 in BALF follows LPS stimulation （P 〈0.05）. The higher dose of simvastatin was associated with a more significant reduction in Muc5ac mRNA expression, neutrophil accumulation and inflammatory cytokine release. Simultaneously, the increased expression of RhoA and p38 MAPK were observed in LPS-treated lung （P 〈0.05）. Simvastatin inhibited the expression of RhoA and p38 phosphorylation in lung following LPS stimulation （P 〈0.05）. However, the increased expression of p38 protein in LPS-treated lung was not affected by simvastatin administration. Conclusions Simvastatin attenuates airway mucus hypersecretion and pulmonary inflammatory damage induced by LPS. The inhibitory effect of simvastatin on airway mucus hypersecretion may be through, at least in part, the suppression of neutrophil accumulation and
