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γ-干扰素对人角膜基质细胞Ⅰ、Ⅲ型胶原合成的抑制作用
lnhibitory effects of γIFN on type Ⅰ、Ⅲ procollagen synthesis in human corneal fibroblasts in vitro
【摘要】 初步探讨γ-IFN如何抑制人角膜基质细胞Ⅰ、Ⅲ型胶原的合成。用体外培养的2—3代人角膜基质细胞在亚汇合状态下分别加入0.5、5、50、500和5000U/ml的γ-IFN,共培养48小时;500U/ml共培养12、24、48小时。地塞米松作为对照。应用Ⅰ、Ⅲ型胶原和纤维连接蛋白(Fi-bronectin,FN)cDNA探针行原位杂交检测mRNA的表达。结果表明,Ⅰ、Ⅲ型胶原mRNA的表达与γ-IFN的剂量成反比,其表达从~±;相同剂量下,在72小时Ⅰ、Ⅲ型胶原mRNA的表达量最低。FNmRNA的表达不受γ-IFN的影响。地塞米松对其表达无任何影响。提示:γ-IFN通过抑制Ⅰ、Ⅲ型胶原mRNA的转录而减少胶原的合成,这种抑制作用具有相对特异性。γ-IFN的这种特异性抑制作用可能成为减轻角膜创伤后角膜混浊的新方法
【Abstract】 Study the mechnism that γIFN inhibits the synthesis of type Ⅰ、Ⅲ procollagen in human corneal fibroblasts.Subconfluent human corneal fibroblasts cultures were exposed to 05,5,50,500,and5000u/ml of human recombinatn γIFN for 48 hours and to 500 u/ml for 12,24,72 hours.After the incubition period,the levels of type Ⅲ(α 1)procollagen,typeⅠ(α 1)procollagen,and fibronectin (noncollagenous protein) mRNA were determined by in situ hybridization with cDNA probes specific for these components.Equal dose of dexamethasones as controls.The level of type Ⅰ、Ⅲ procollagen mRNA were gradually reduced from ++++to±with the increase of the dosage of γIFN;on equal dosage,the level of type Ⅰ、Ⅲ procollagen mRNA were the least in 72 hours;Fibronectin mRNA unaffected. Dexamethasone was no effection for them.lt is suggested that γIFN can inhibit the synthesis of type Ⅰ、Ⅲcollagen by inhibition of mRNA transcription,its inhibitions is relatively specific.The specific inhibitions may be a new method that reduce corneal haze during corneal would healing.
【Key words】 lnterferongama; collagen; corneal fibroblasts; would healing; human;
- 【文献出处】 中国实用眼科杂志 , 编辑部邮箱 ,1997年12期
- 【分类号】R772.2
- 【被引频次】2
- 【下载频次】36