目的构建脑内过表达胰岛素样生长因子结合蛋白-4(insulin-like growth factor binding protein-4,IGFBP-4)的转基因小鼠,以研究IGFBP-4对脑发育的作用。方法构建神经元特异性启动子血小板源性生长因子β链(platelet derived growth factorβchain,PDGF-β)驱动的IGFBP-4表达载体,通过显微注射构建转基因小鼠。用PCR法检测小鼠子代基因组IGFBP-4 c DNA的整合情况,Western blotting法和免疫组织化学法观察IGFBP-4在脑内的表达丰度和分布,比较野生型和转基因小鼠的体质量和脑质量的改变。结果外源IGFBP-4 c DNA稳定整合于转基因小鼠基因组,IGFBP-4蛋白在成年小鼠脑内表达水平升高了267%,脑区IGFBP-4蛋白分布符合PDGF-β启动子驱动的蛋白表达特征,与野生型小鼠IGFBP-4部位相似。转基因小鼠体质量未见明显改变,整脑质量增加了8.4%(P<0.05),其中脑干增加了16.5%(P<0.05),其余脑区改变不明显。结论外源IGFBP-4转基因在小鼠基因组中得到整合并能稳定遗传和表...
【英文摘要】
Objective To establish a transgenic mouse which may over express insulin-like growth factor binding protein-4( IGFBP-4)in the brain,in order to explore the effect of IGFBP-4 on brain development. Methods The neuron-specific transgene expression cassette of IGFBP-4 was constructed and then microinjected into the fertilized mouse egg. The genotype of the transgenic mice was identified using PCR. The expression of IGFBP-4 protein in the brain was detected by Western blotting,and the spatial expression of IGFBP...
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