GPNMB通过调控MITF下游色素相关基因表达影响黑色素细胞色素的生成
发布时间:2018-08-16 18:40
【摘要】:【目的】探究GPNMB是否会通过调控MITF及其下游色素相关基因的表达来影响黑色素细胞中色素的生成,为进一步阐明GPNMB对黑色素细胞中色素生成的具体机制提供理论依据。【方法】首先对小鼠GPNMB核酸序列进行检索,通过对GPNMB和慢病毒表达载体序列分析来筛选出合适的酶切位点,在此选取SalⅠ和XbaⅠ作为酶切位点。并对GPNMB基因序列设计含有SalⅠ和XbaⅠ酶切位点的全长引物,克隆GPNMB基因全长序列,将含有酶切位点的GPNMB基因片段与T载体进行连接,送华大基因测序。将构建成功的T载体提取质粒,双酶切后将其与含有绿色荧光蛋白(GFP)的慢病毒表达载体相连接,送华大基因进一步测序确认。使用质粒中提试剂盒获得大量去内毒素的GPNMB慢病毒真核表达载体。通过体外培养小鼠黑色素细胞,选择细胞对数生长期利用细胞转染技术过量表达GPNMB。观察转染后黑色素细胞形态特征变化和绿色荧光蛋白的表达量,收集黑色素细胞,并对其进行转染效率验证,黑色素含量进行测定,以及经Real-time PCR和Western blot检测转染后PMEL、MITF、TYR、TYRP1、TYRP2和OA1的mRNA和蛋白的表达量。【结果】与正常组(Control)相比试验组(Vector-GFP-GPNMB)、空载组(Vector-GFP)中黑色素细胞的形态特征无明显变化,并且试验组、空载组的绿色荧光蛋白表达量显示5μg DNA/孔转染效率最高。相对于空载组和正常组,试验组的GPNMB mRNA和蛋白水平都显著的升高(P0.01)。与空载组相比,试验组黑色素含量升高1.34倍,差异显著(P0.01)。Real-time PCR检测结果显示,MITF mRNA显著降低2.25倍(P0.01);PMEL mRNA显著升高1.59倍(P0.05);TYRP1 mRNA显著升高2.35倍(P0.01);TYRP2 mRNA显著升高1.60倍(P0.01);TYR mRNA升高1.65倍和OA1 mRNA升高1.5倍,但变化不明显。Western blot检测结果显示,MITF蛋白显著降低1.59倍(P0.01);TYR蛋白显著升高1.23倍(P0.01);TYRP2蛋白显著升高4.35倍(P0.01);OA1蛋白显著升高1.31倍(P0.05);TYRP1蛋白升高1.05倍,但变化不明显。【结论】GPNMB过量表达使MITF下游基因PMEL、TYR、TYRP1、TYRP2和OA1的表达量增加,却使MITF的表达量降低,由此表明GPNMB可能受非MITF调控路径调节PMEL、TYR、TYRP1、TYRP2和OA1的表达,从而影响黑色素的生成。
[Abstract]:[objective] to investigate whether GPNMB affects melanocyte pigment production by regulating the expression of MITF and its downstream pigment related genes. In order to further elucidate the specific mechanism of melanocyte pigment formation by GPNMB. [methods] the nucleic acid sequence of mouse GPNMB was searched first, and the suitable restriction site was screened by analyzing the sequence of GPNMB and lentivirus expression vector. Sal 鈪,
本文编号:2186844
[Abstract]:[objective] to investigate whether GPNMB affects melanocyte pigment production by regulating the expression of MITF and its downstream pigment related genes. In order to further elucidate the specific mechanism of melanocyte pigment formation by GPNMB. [methods] the nucleic acid sequence of mouse GPNMB was searched first, and the suitable restriction site was screened by analyzing the sequence of GPNMB and lentivirus expression vector. Sal 鈪,
本文编号:2186844
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