Expression of VEGF and Ang-2 in a rat model of acidosis-induced retinopathy of prematuirity
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摘要: 目的 建立酸中毒诱导的早产儿视网膜病(ROP)大鼠动物模型(AIR模型),研究血管内皮生长因子(VEGF)、血管生成素-2(Ang-2)的表达变化规律,探讨其与ROP血管发育及新生血管形成之间的关系.方法 1日龄SD新生大鼠随机分为酸中毒诱导模型组(ROP组)和正常对照组(C组),通过管饲NH4 C1方法建立AIR模型.应用免疫组化方法标记视网膜VEGF、Ang-2的表达水平.结果 免疫组化结果显示,8日龄ROP大鼠VEGF、Ang-2的表达水平明显低于对照组(P＜0.05),而在停止管饲NH4Cl后的10日龄、13日龄ROP组大鼠视网膜VEGF、Ang-2表达水平明显高于对照组(P＜0.05).在实验过程中VEGF及Ang-2的表达趋势相同.结论 酸中毒使VEGF及Ang-2的蛋白表达水平下调；停止管饲NH4Cl后2者表达水平上调；2者变化过程与视网膜新生血管发展进程有关.VEGF、Ang-2可能在视网膜正常血管发育及ROP的新生血管化进程中起到重要作用.
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