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机构地区:[1]江苏省常州市第三人民医院眼科,213001 [2]无锡市第二人民医院眼科 [3]南京医科大学第一附属医院眼科
出 处:《中华眼科杂志》2013年第11期981-986,共6页Chinese Journal of Ophthalmology
摘 要:目的 研究水通道蛋白4(AQP4)基因敲除小鼠视网膜神经节细胞(RGC)的功能及基因缺失对高眼压模型小鼠眼压变化的影响.方法 实验研究.AQP4基因敲除(KO)小鼠和野生型(WT)小鼠各18只(36只眼),2%水合氯醛0.2 ml/10 g体重腹腔注射麻醉,采用自制电极测量各小鼠的图形视网膜电流图(PERG).使用532 nm二极管激光光凝角膜缘和巩膜上静脉的方法制作KO小鼠和WT小鼠的高眼压模型,使用IcareLAB回弹式眼压计每天中午测量小鼠眼压5次,取其平均值,观察AQP4基因敲除小鼠和野生型小鼠各自眼压的变化情况.采用重复测量方差分析结合t检验分析各组数据.结果 KO小鼠PERG的P50振幅(5.53±1.31) μV,N95振幅(7.71±1.89) μV.WT小鼠的P50振幅(8.14±1.24)μv,N95振幅(11.30±2.61) μv.KO小鼠的P50和N95的振幅较野生型小鼠低,(t值分别为5.70和3.83,P<0.01),潜伏期也较野生型小鼠提前.KO小鼠(18只鼠36眼)光凝手术前平均眼压(6.61 ±0.90) mm Hg(1 mm Hg =0.133 kPa),WT小鼠(18只鼠36眼)光凝手术前平均眼压(7.31 ±0.98) mm Hg,KO小鼠和WT小鼠之间的基础平均眼压值存在微小差异但有统计学意义(t =3.09,P<0.05).光凝手术后KO小鼠和WT小鼠的眼压值均在术后第1天上升到最高点[(14.78±1.80) mm Hg,(16.44 ±1.46) mm Hg],达基础眼压的两倍多.之后两种小鼠的眼压值均逐渐降低,在第8天时KO小鼠与WT小鼠的眼压分别为(6.78±0.81) mm Hg,(7.44±0.86) mm Hg,基本降至术前基础眼压水平.结论 AQP4基因缺失可能破坏了小鼠的RGC功能,对小鼠的视网膜电生理功能产生了不良影响.KO和WT两种小鼠高眼压模型眼压值变化的幅度基本一致,KO小鼠的眼压始终小于WT小鼠的眼压,并贯穿整个实验过程.Objective To investigate the effect of aquaporin4 (AQP4) knock out (KO) on the dysfunction of retinal ganglion cells (RGC) in laser-induced ocular hypertension (OHT) mice.Methods Experimental study.AQP4 KO mice (n =18,36 eyes) and wide type (WT) mice (n =18,36 eyes) were used.Unilateral OHT was induced by laser photocoagulation in KO and WT mice after anesthesia.A simultaneous recording of PERG was performed by homemade electrodes.Intraocular pressure (IOP) was measured with an IcareLAB rebound tonometer every day at noon before and after surgery.The data was analysised by ANOVA and t test.Results In AQP4 KO mice,the mean P50 and P95 amplitudes were significantly (P < 0.01) reduced compared with WT mice [P50:KO:(5.53 ± 1.31) vs WT:(8.14 ± 1.24) μvt=5.70andP95:KO:(7.71 ±1.89) vs WT:(11.30±2.61) μv,t=3.83,respectively].The latencies of AQP4 KO mice in both P50 and N95 were shorter than those of WT (t =5.70 and t =3.83 respectively,P <0.01).The mean IOP was significantly (P < 0.05) increased after photocoagulation in AQP4 KO and WT mice compared with pre-photocoagulation [KO post:(14.78 ± 1.80) mm Hg(1 mm Hg =0.133 kPa) vs KO pre-photocoagulation:(6.61 ±0.90) mm Hg and WT post:(16.44 ± 1.46) mm Hg vs WT pre-photocoagulation:(7.31 ± 0.98)mm Hg,respectively] with animals under general anesthesia.IOP was lowered mildly but significantly in KO mice when compare with WT mice (t =3.09,P < 0.05) lasting seven days.IOP was gradually decreased to baseline values at day eight in both of KO and WT mice.Conclusions Our results indicate that AQP4 null may damage retinal function that can be detected by the measurement of PEGR,a sensitive parameter to reflect the function of RGC.
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