非诺贝特对糖尿病小鼠视网膜神经组织中miR-26a-5p/PTEN表达的影响

Effect of fenofibrate on the expression of miR-26a-5p/PTEN in retinal neurons of diabetic mice

目的:研究非诺贝特对糖尿病小鼠视网膜神经损伤的保护作用并观察其对miR-26a-5p及其靶基因PTEN的影响。方法:构建糖尿病小鼠模型,并进行非诺贝特灌胃,H&E及透射电镜观察视网膜神经损伤情况,Real-time PCR检测视网膜组织中miR-26a-5p的表达,Western blotting检测同源性磷酸酶-张力蛋白(PTEN)在视网膜组织中的表达,并观察NF-κB及IL-1β的水平及视网膜神经上皮的结构变化。结果:与糖尿病组相比,非诺贝特治疗组糖尿病小鼠视网膜神经节细胞损伤及神经纤维层萎缩明显减轻,视网膜中miR-26a-5p表达升高,PTEN mRNA和蛋白表达下降,炎性介质NF-κB及IL-1βmRNA表达水平下降(P<0.05)。结论:非诺贝特通过上调miR-26a-5p抑制PTEN的表达,降低炎症因子水平,减轻视网膜细胞损伤,发挥糖尿病视网膜神经保护作用。

AIM:To study the protective effect of fenofibrate on diabetic retinal neurodegeneration and observe its effect on miR-26a-5p and its target gene PTEN in the retinal of diabetic mice.METHODS:Diabetic mice models were established and they were gavaged by fenofibrate.H&E staining and transmission electron microscopy were used to observe the impairments of retinal neurons.Real-time PCR was used to examine the expression of miR-26a-5p,and Western blotting was employed to measure the expression of phosphatase and tensin homologue(PTEN)in the retina of diabetic mice.The expression level of nuclear factor-κB(NF-κB),interleukin-1β(IL-1β)and the morphology of neural tissues were observed.RESULTS:When compared with the diabetic mice,fenofibrate significantly attenuated the damage to retinal ganglion cells and the atrophy of retinal nerve fiber layer.While the level of miR-26a-5p was increased and the levels of PTEN and inflammatory mediators were significantly decreased in the retina of fenofibrate treated diabetic mice,with significant statistical significance(P<0.05).CONCLUSIONS:Fenofibrate protects against diabetic retinal neurodegeneration by upregulating miR-26a-5p and inhibiting PTEN,attenuating the inflammatory response and alleviating retinal cell injury.