摘要
目的 通过上皮细胞对缺氧和炎性因子刺激的主动应答作用 ,探讨上皮细胞和缺氧对鼻息肉早期形成的影响。方法 将鼻息肉及下鼻甲的上皮细胞分别在常氧和缺氧状态下 ,以及不同炎性因子刺激条件下进行无血清原代上皮细胞的培养 ,采用原位杂交 ,酶联免疫吸附测定 (enzyme linkedimmunosorbentassay ,ELISA)的方法 ,用促红细胞生成素 (erythropoietin ,EPO)为缺氧标志 ,检测上皮细胞分泌合成的血管内皮生长因子 (vascularendothelialgrowthfactor ,VEGF)的线粒体RNA(mitochondriaRNA ,mRNA)和蛋白质水平的变化。结果 ①缺氧条件下 ,EPO在来自于鼻息肉和下鼻甲的上皮细胞中明显表达 ,且两者无明显差异 ,表明EPO可作为组织缺氧标志 ;②上皮细胞合成的VEGFmRNA的能力在各种刺激下增加 ,而以缺氧条件下增加最为明显 (P <0 0 0 1) ,其中鼻息肉的合成能力要强于下鼻甲 (P <0 0 1) ;③VEGF的蛋白质表达水平在不同的炎性因子以及缺氧刺激下表达增加 (P <0 0 1) ,且随作用时间的延长而增强。其中以缺氧刺激下升高最为明显 (P <0 0 0 1)。鼻息肉的表达明显高于下鼻甲 (P <0 0 1)。结论 上皮细胞在缺氧时可主动合成VEGF。而这种中鼻道黏膜缺氧诱导的VEGF的产生和分泌是鼻息肉早期形成的重要机制。
Objective To understand the role of nasal mucous epithelial cells to hyppoxia in early stage of nasal polyps(NP) formation. Methods Epithelial cells of NP and inferior turbinate (IT) were cultured without serum under normal oxygen and hypoxia, and stimulus of inflammatory cytokines. Erythropoietin (EPO) was regarded as hypoxia mark, and expression of vascular endothelial growth factor(VEGF) mRNA and protein derived from epithelial cells were detected respectively by in situ hybridization and ELISA. Results ①Under hypoxia, EPO mRNA was expressed intensely in epithelial cells from NP and IT, and there was no significant difference between both of them. This result suggested that EPO might be regarded as a hypoxic mark.② The ability of producing VEGF mRNA increased with cytokines stimulation, especially under hypoxia. Protein level of VEGF from epithelial cells of NP and IT increased with cytokines stimulation, especially in hypoxia and was time-dependent. Conclusion Epithelial cells actively produce vast VEGF under hypoxia. The VEGF induced by hypoxia of the mucosa in middle meatus is of importance in the formation of nasal polyps(NP) in early stage, which may be the major cause of NP formation in middle meatus.
出处
《中华耳鼻咽喉科杂志》
CAS
CSCD
北大核心
2002年第1期34-37,T002,共5页
Chinese Journal of Otorhinolaryngology
关键词
鼻息肉
细胞低氧
血管内皮生长因子
上皮细胞
Nasal polyps
Cell hypoxia
Endothelial growth factors
Epithelial cells
