摘要
Objective To test the immunosuppressive effect of cyclosporine (Cs) in a polymer placed in the anterior chamber of corneal allograft recipients. Methods Wistar inbred rats with vascularized corneas were recipients of corneal allografts from Sprague-Dawley donor rats. Rats underwent penetrating keratoplasty and were divided randomly into four groups: untreated control animals (UCA); Cs-polymer anterior chamber recipients (CPA); co-polymer subconjunctival recipients (CPS); and Cs-olive oil drop recipients (COO). Grafts were examined by slit lamp every 3 days and clinical conditions were scored. Cs concentration in the aqueous humor was assayed at 1, 2, and 4 weeks. At 1, 2 and 4 weeks after transplantation, the operated eyes were collected for histopathological evaluation of the grafts.Results The median survival time of the allografts was 8.2±1.48 days for the UCA group, 11.4±2.50 days for the CPS group, and 17.0±2.00 days for the CPA group. There was a statistically significant difference (P【0.05) between survival time of the allografts in the animals of the CPA group compared to the other groups of graft recipients. Significantly higher concentrations of Cs were found in the eyes given an anterior chamber implant of Cs-polymer, compared to other treatment groups or untreated rats. A transient inflammatory response in the anterior chamber was observed in the CPA group. Conclusions Cs-polymer placed in the anterior chamber significantly prolongs corneal allograft survival time in a high risk corneal graft rejection model. This intraocular delivery system may be a valuable adjunct for the suppression of immune graft rejection.
目的 探讨前房内植入含环孢素A的缓释系统 (CsADDS)抑制高危角膜移植术后免疫排斥反应的有效性和可行性。方法 角膜新生血管化的近交系Wistar大鼠作为受体 ,供体取自SD大鼠 ,行穿透性角膜移植的大鼠随机分为 4组 :(1)对照组 ;(2 )CsADDS前房植入组 ;(3)CsADDS结膜下植入组 ;(4) 1%CsA橄榄油滴眼组。植片每 3天行裂隙灯显微镜检查并加以评估。分别于术后 1、2、4周行房水中CsA浓度的检测。移植后的 1、2、4周取眼球行组织病理学检查。结果 角膜植片平均存活时间分别为 :对照组 8 2± 1 4 8天 ;CsADDS结膜下植入组 11 4± 2 5 0天 ;前房植入CsADDS组 17 0± 2 0 0天。前房植入组与其它各组相比 ,有显著统计学差异 (P <0 0 5 )。相对于其它治疗组前房植入组的眼内CsA浓度明显增高 ,并且发现CsA聚合物的植入体在前房中只引起轻微而短暂的炎症反应。结论 前房植入CsA聚合物可明显延长高危角膜移植术后的植片存活时间 ,这一眼内缓释系统对于抑制高危角膜移植术后的免疫排斥反应不失为一种有效方法。
