哮喘大鼠气道上皮CTGF表达及其与气道重构关系的研究

Roles of epithelial CTGF expression in airway remodeling in asthmatic rats

目的 通过观察结缔组织生长因子 (Connectivetissuegrowthfactor,CTGF)在哮喘大鼠肺内的表达变化 ,揭示CTGF在哮喘气道重构中的作用。方法 以卵白蛋白 (Ovalbumin ,OVA)致敏并持续激发大鼠哮喘 ,天狼猩红染色法检测胶原分布及分类 ,酸水解法测定肺组织羟脯氨酸含量 ,SABC免疫组化法检测CTGF在肺组织的表达。结果 大鼠持续激发哮喘 2 1d后气道壁胶原增生 ,气道上皮细胞CTGF表达阳性 ,CTGF表达与肺羟脯氨酸含量密切相关 (r =0 63 ,P <0 0 1)。结论 大鼠长期持续激发哮喘可导致气道上皮下纤维化及气道重构 ,其机制可能与CTGF表达上调有关。

Objective To investigate the roles of connective tissue growth factor(CTGF) in airway remodeling in asthmatic rats by observation of the changes of CTGF expression in the lungs of asthmatic rats. Methods Rats were sensitized and challenged continually with ovalbumin(OVA) for the purpose of induction of asthma in rats. The distribution and types of collagens were detected by Cirius red staining. Lung hydroxyproline content was determined by acid hydrolysis. CTGF expression in rat pulmonary tissues was detected by SABC immunohistochemistry. Results After continual challenging with OVA for 21 days, collagen hyperplasia was found in the airway wall and CTGF positive expression in airway epithelium. CTGF expression was closely associated with lung hydroxyproline content ( r =0.63, P <0.01). Conclusion Asthma continually challenged with OVA can result in sub epithelial fibrosis and remodeling in airway, which may be associated with the up regulation of CTGF overexpression.