VIPR2在形觉剥夺性近视眼中的动态表达

目的：探讨高度近视眼眼球后壁组织血管活性肠肽受体2亚型（vasoactive intestinal peptide receptor 2,VIPR2）的动态表达及意义。方法：选择出生1d的黄鸡共21只，右眼遮盖作为实验组，分别持续遮盖1周，2周和4周。左眼未遮盖作为对照组。2组均采用检影验光检测屈光度；眼科A超测定新鲜离体眼轴长度；对2组3个时间段眼球后壁行SP法免疫组织化学染色，检测VIPR2的动态表达。结果：实验组由实验前远视眼快速演变为高度近视眼，并随遮盖时间延长，近视度数加深，眼轴延长；2组视网膜光感受器外节、脉络膜均有VIPR2强阳性表达；随出生时间延长，2组VIPR2表达均逐渐下调。与对照组相比，实验组VIPR2表达明显上调（P<0.05）。结论：形觉剥夺可导致高度近视； VIPR2表达主要位于视网膜光感受器外节和脉络膜，可能参与了近视眼的形成与发展。

Dynamic expression of VIPR2 in form deprivation myopia

Objective To investigate the dynamic expression and significance of vasoactive intestinal peptide receptor 2 (VIPR2) on retina-choroid-clera in high myopia. Methods Twenty-one yellow chicks of 1 day old were used in the research. The right eyes were the experimental group, covered continuously for 1 week, 2 weeks and 4 weeks respectively. The left eyes were not covered as the normal control group. Both groups were detected diopter degrees using retinoscopic refraction, determinated eyeball axis using ophthalmology ultra-A, and investigated VIPR2 expression on retina-choroid-sclera in both groups at three stages by SP immunohistochemical staining. Results The experimental eyes changed from hypermetropia at pre-experiment to high myopia during the experiment stages, and the diopter degrees were deeper and eyeball axis was longer along with the period of being covered. Both groups had strong expression of VIPR2 on photoreceptor-outer segment of the retina and choroids. The expression was down-regulated with the time in both groups. Compared with the control group, VIPR2 expression of the experimental group was significantly up-regulated (P<0.05). Conclusion Form deprivation could induce high myopia. The expression of VIPR2 existed on photoreceptor-outer segment of the retina and choroids. VIPR2 may play an important role on the formation and development of myopia.