目的:定量检测转化生长因子-(受体Ⅰ(transforming growth factor-(typeⅠ receptor, TβRⅠ)和受体Ⅱ(TβRⅡ)基因在大鼠视网膜中的表达水平,探讨TGF-(不同受体在视网膜中表达的差异及其意义.方法:分离取出大鼠视网膜,抽提RNA并逆转录,实时荧光定量PCR技术分析视网膜中TβRⅠ和TβRⅡ的mRNA含量.结果:TBRⅠ相对于18S的mRNA含量是0.00034±0.00013,TβRⅡ相对于18S的mRNA含量是0.0001±0.00005,差异有统计学意义(P<0.01).在大鼠视网膜中以TβRⅠ表达为主,TβRⅠ和TβRⅡ比值的平均值为3.9±1.7.结论:实时荧光定量PCR技术能够针对性地精确分析极少量组织细胞的基因表达,TβRⅠ的mRNA在视网膜中的表达明显高于TβRⅡ,提示这可能是与TβRⅠ及TβRⅡ本身结构特点和在TGF-β信号转导过程中的不同作用有关.当TβRⅠ/TβRⅡ比例改变时,可影响细胞对TGF-β的应答反应,可能是增殖性视网膜病变的发生机制之一.%AIM: To quantitatively investigate transforming growth factor-β type Ⅰ receptor (TβRⅠ) and transforming growth factor-β type Ⅱ receptor (TβRⅡ) gene expressions in rat retina.METHODS: Sprague-Dawley rats were chosen in this research. Gene expression was detected quantitatively by reverse transcription polymerase chain reaction (RT-PCR) analysis. RESULTS: The expression level of TβRⅠ and TβRⅡ were 0.00034±0.00013 and 0.0001±0.00005, respectively. The expression level of TβRⅠ was obviously higher than that of TβRⅡ in the rat retina with statistical significance (P<0.01). The ratio of TβRⅠ/TβRⅡ was 3.9±1.7.CONCLUSION: Real time quantitative RT-PCR is an effective method to detect differential expression genes in retina. The change of TβRⅠ/TβRⅡ expression may play an important role in the pathogenesis of retinopathy, which could be further investigated in its significance in the development of proliferation retinopathy.
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