哮喘气道上皮杯状细胞合成GM-CSF及其调控机制的研究

Study on the ability and mechanism of goblet cell in airway to synthesize granulocyte-macrophage colony-stimulating factor in rat with asthma

目的 观察哮喘小鼠气道上皮杯状细胞合成粒细胞 /巨噬细胞集落刺激因子 (GM CSF)的能力 ,探讨钙激活Cl-通道(CLCA)在合成中的调控作用。方法 取成年雄性BALB/c小鼠 ,采用卵蛋白致敏法制备哮喘模型。AB PAS特染法检测哮喘小鼠小支气管杯状细胞的分布 ;同一解剖部位采用免疫组化染色法检测GM CSF的表达。体外培养人气道黏液上皮细胞系NCI H2 92 ,采用含人hCLCA1的重组质粒pIRES2 EGFP/hCLCA1转染该细胞。筛选到稳定表达hCLCA1的细胞后 ,免疫组化法及RT PCR法检测该细胞GM CSF的表达、转录水平。设非转染细胞和CLCA阻断剂NFA干预的转染细胞为两个对照组。结果 哮喘小鼠气道杯状细胞GM CSF免疫组化染色为阳性。转染hCLCA1细胞的GM CSF表达与转录水平明显高于两个对照组 ;NFA能抑制转染细胞GM CSF的表达和转录。结论 哮喘气道上皮杯状细胞能合成GM CSF ,特定CLCA表达升高是促进GM CSF合成的机制之一。

Objective To evaluate the ability of goblet cell in the airway in rat with asthma to synthesize granulocyte-macrophage colony-stimulating factor (GM-CSF),and the role of calcium-activated chloride channel (CLCA) in the synthesis. Methods A model of asthma was replicated in male BALB/c mice with ovalbumin sensitization. The goblet cells in small bronchi were identified with AB-PAS staining,and the expression of GM-CSF in the same airway was assessed with immunohistochemistry staining. The recombinant plasmid of pIRES2-EFGP/hCLCA1 was transfected stably into the human mucoepidermoid cell NCI-H292. The expression and transcription levels of GM-CSF in transfected cells were determined with immunohistochemistry staining and RT-PCR assay. The non-transfected cell and the transfected cell exposed to niflumic acid (NFA),which was a CLCA inhibitor,were designated as two control groups. Results Positive staining of GM-CSF expression could be seen in the goblet cells of small bronchi. The cells with expression of hCLCA1 showed much higher levels of GM-CSF expression and transcription than those of two control groups. It was also found that NFA could effectively reduce the levels of GM-CSF in transfected cells. Conclusion The goblet cell of asthmatic airway can synthesize GM-CSF,and one of mechanisms is the increased expression of CLCA.