血管生成抑制因子k4k5对实验性脉络膜新生血管的抑制作用

目的 评价血管生成抑制因子kringle4-5能否抑制氩激光诱导小鼠的脉络膜新生血管。 方法 通过氩 激光眼底光凝诱导C57BL/6J小鼠产生脉络膜新生血管，随机分为对照组、低剂量组和高剂量组，每组各16只小鼠。在眼底氩激光光凝后立即对3组小鼠分别球后注射林格氏液、kringle4-5 20、50 μg。在光凝后7、14 d通过荧光素眼底血管造影(fundus fluorescence angiography,FFA)评价脉络膜新生血管的发生率。光凝后14 d将动物处死，行组织学检查及观察CD105的表达。用免疫组织化学方法检测光凝后14 d各组血管内皮生长因子(vascular endothelial growth factor, VEGF)及碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)的表达。 结果 对照组，光凝后14 d脉络膜新生血管的发生率为64.3%，低剂量组和高剂量组脉络膜新生血管的发生率分别为51.2%（P＜0.05）、44.1%（P＜0.01）。组织学检查显示治疗组脉络膜新生血管(choroidal neovascularization,CNV)范围小于对照组，与剂量呈正相关，高剂量组差异有显著性的意义(P＜0.05) ,而且CD105的表达，治疗组少于对照组(P＜0.05)。VEGF及bFGF的表达在对照组与治疗组之间差异无显著性的意义。 结论 Kringle4-5对激光诱导小鼠的实验性CNV具有抑制作用，在此剂量范围，对VEGF及bFGF的表达无明显影响。（中华眼底病杂志，2003，19：201-268）

Inhibitory effect of kringle 4-5 on experimental choroidal neovascularization

Objective To determine whether kringle 4-5 could inhibit choroidal neovascularization (CNV) in mice induced by argon laser photocoagulat ion. Methods Fundus laser photocoagulation was performed on C57BL/6J mice to induce CNV. In treatment group, 20 μg (low dosage group) and 50 μg (high dosage group) kringle 4-5 were injected retrobulbarly after photocoagulation. In control group, equilibrium liquid was injected retrobulbarly. Choroidal neovascularization was evaluated on the 7th and 14th day after photocoagulation by fundus fluorescein ang iography. The mice were killed on the 14th day after photocoagulation, the lesions were evaluated histologically and immunohistochemically, and the expression of CD105 was detected. The Expression of VEGF and bFGF was detected by immunohist ochemistry on the 4th day after photocoagulation.Results The incidence of CNV was 64.3% in control group, 51.2%（P＜0.05）in low dosage group, and 44. 1% (P＜0.01) in high dosage group. The CNV lesions were smaller in kringle 4-5 injected eyes in a dose-dependent manner and the number of proliferative vascular endothelial cells in the subretinal membrane of the treated eyes was smaller than that of the control eyes. There was no significant difference of the expression of VEGF and bFGF between the mice in control and treatment group.Conclus ions Kringle 4-5 could inhibit the development of choroidal neovascularization in the experimental mice model.(Chin J Ocul Fundus Dis，2003，19：201-268)