中文摘要：

目的研究分泌型卷曲相关蛋白1（SFRP1）在慢性阻塞性肺疾病（简称慢阻肺）气道重塑中的作用和机制。方法纳入2014年6月至2016年6月在江苏省人民医院确诊慢阻肺的稳定期患者45例，健康对照21例。采取酶联免疫吸附试验检测血清SFRP1的表达，采用蛋白印迹法检测人支气管上皮细胞（16HBE）的SFRP1、上皮钙黏素（E-cadherin）及α-平滑肌肌动蛋白（α-SMA）的表达。结果慢阻肺患者血清SFRP1水平较健康对照明显升高[（80.65±15.01）pg/ml比（23.89±2.59）pg/ml，P〈0.05]，慢阻肺患者血清SFRP1水平与肺功能（FEV1、FEV1%pred、FVC）呈负相关（相关系数r分别为–0.3689、–0.3826、–0.4173，P〈0.05）。慢阻肺吸烟组患者血清SFRP1水平明显高于慢阻肺不吸烟组[（97.74±21.95）pg/ml比（52.51±14.87）pg/ml，P〈0.05]。香烟烟雾提取物可以刺激16HBE细胞表达SFRP1，外源性SFRP1能下调E-cadherin的表达，并上调α-SMA的表达。结论SFRP1可能通过调控支气管上皮细胞E-cadherin和α-SMA参与慢阻肺气道重塑的形成。

英文摘要：

Objective To study the effect of secreted frizzled-related protein 1 （SFRP1） on airway remodeling in chronic obstructive pulmonary disease （COPD）. Methods Forty-five patients with stable COPD and 21 healthy controls were collected in Jiangsu Province Hospital from June 2014 to June 2016. The level of SFRP1 in serum was detected by ELISA. The expression of SFRP1, E-cadherin and α-smooth muscle actin （α-SMA） in human bronchial epithelial cells （16HBEs） were detected by Western blot. Results The level of SFRP1 in serum of the COPD patients was significantly higher than that in the healthy controls [（80.65 ± 15.01） pg/ml vs. （23.89 ± 2.59） pg/ml, P〈0.05]. There were negative correlations between serum SFRP1 levels and lung function parameters （FEV 1, FEV 1%pred, and FVC） in the COPD patients （correlation coefficient r value were -0.368 9, -0.382 6 and -0.417 3, respectively, all P〈0.05）. The level of serum SFRP1 in the COPD smokers was significantly higher than that in the COPD non-smokers [（97.74 ± 21.95） pg/mlvs. （52.51 ± 14.87） pg/ml, P〈0.05]. The expression of SFRP1 could be up-regulated by cigarette smoke extract in 16HBEs. The expression of E-cadherin of 16HBEs was up-regulated by recombinant SFRP1, but the expression of α-SMA of 16HBEs was down-regulated by recombinant SFRP1. Conclusion SFRP1 may be involved in the pathogenesis of airway remodeling of COPD by regulating the expression of E-cadherin and α-SMA of bronchial epithelial cells.