Neu-P11对急性高眼压大鼠眼压及视网膜组织胶质原纤维酸性蛋白表达的影响

目的 探讨Neu-P11对急性高眼压大鼠眼压及视网膜胶质原纤维酸性蛋白(glial fibrillary acid protein,GFAP)表达的影响.方法 24只雄性SD大鼠随机分为:正常对照组、高眼压组、褪黑素治疗组和Neu-P11治疗组,每组6只,后3组采用Trendelenburg卧位法建立高眼压模型,各组通过眼角膜滴注方法给药.正常对照组和高眼压组滴注10 μL生理盐水,褪黑素治疗组和Neu-P11治疗组分别滴注10 μL 100 μmol·L-1褪黑素和NeuP11药物治疗,给药后休息2h,再次置于卧位45 min后每小时测1次眼压,共6次,观察1周,重复实验1次.实验末注射过量戊巴比妥钠处死大鼠,留取各组大鼠眼球常规组织学切片观察SD大鼠视网膜形态学变化;免疫组织化学染色观察视网膜GFAP的表达.结果 正常对照组眼压为(13.61±0.55) mmHg(1 kPa=7.5 mmHg),高眼压组眼压为(41.26±1.73)mmHg(P ＜0.01),即急性高眼压大鼠模型建立成功.与正常对照组相比,高眼压组大鼠视网膜水肿增厚,层次不清晰,GFAP表达呈强阳性.而褪黑素治疗组和Neu-P11治疗组大鼠眼压较高眼压组显著降低,GFAP蛋白阳性表达明显减弱.结论 Neu-P11能够降低急性高眼压大鼠眼压,抑制视网膜组织胶质细胞的激活,降低GFAP表达,保护视网膜.

Effect of Neu-P11 on retinal GFAP protein expression and IOP of acute high IOP rats

Objective To explore the effects of the new melatonin nonselective agonists Neu-P11 on intraocular pressure (IOP) and glial fibrillary acid protein (GFAP) expression in the retina of acute high IOP rat.Methods Twenty-four male Sprague-Dawley rats were randomly divided into 4 groups (6 cases in each group):Normal IOP with local treatment (NIL) group,high IOP with local treatment (HIL) group,HILwith melatonin treatment (HIL-M) group,HIL with Neu-P11 treatment (HIL-N) group.10 μL normal saline was instilled in NIL group and HIL group,while 10 μL 100 μmol · L-1 Mel/Neu-P11 treated in HIL-M group and HIL-N group.After 2 hours of rest,rats were placed in the Trendelenburg position duration 45 minutes.And then,IOP was measured every hour for 6 hours,and repeated it for a week.The excessive sodium pentobarbital was injected to SD rats at the end of the experiment.The rat eyeballs were took out to perform HE and immunohistochemical staining to detect retina GFAP protein expression.Results After a week,IOP in HIL group was (41.26 ± 1.73) mmHg (1 kPa =7.5 mmHg),NIL group was (13.61 ± 0.55) mmHg,which mean the Trendelenburg could induce high IOP in SD rats.Compared with the NIL group,the retinal becoming thick,the level of organization was not clear and the expression of GFAP protein was quite high in HIL group.At the same time,the GFAP protein expression and IOP were significantly weakened in HIL-M group and HIL-N group compared with HIL group.Conclusion Neu-P1 1 can reduce IOP,inhibit the activation of gliocyte,and decrease the expression of GFAP to protect the retina.