白蒺藜皂苷对慢性高眼压兔视网膜SOD活性和MDA含量的影响

目的:观察白蒺藜皂苷对慢性高眼压兔SOD活性和MDA含量的影响,探讨其对兔慢性高眼压模型视网膜氧化损伤的抑制作用。方法:将24只健康新西兰白兔随机分为正常对照组(A组),高眼压模型空白组(B组),高眼压模型灯盏细辛(erigeron brevicapas hand mass,EBHM)治疗组(C组),高眼压模型蒺藜皂苷(gross saponins of tribulus terrestris,GSTT)治疗组(D组);以20g/L甲基纤维素前房注射建立兔慢性高眼压模型,EBHM治疗组实验兔每日耳缘静脉推注EBHM注射液4.5mg/kg,GSTT治疗组实验兔每日耳缘静脉推注GSTT针剂5mg/kg,连续用药4wk并每日测眼压,于第28d摘取眼球检测兔视网膜组织中超氧化物歧化酶(superoxide dismutase,SOD)活性和丙二醛(maleic dialdehyde,MDA)含量。结果:兔眼造成青光眼模型后,其眼压在观察期内维持在32～39mmHg;高眼压模型空白组与正常对照组、EBHM治疗组、GSTT组比较,视网膜中MDA和SOD的含量差异有统计学意义(P<0.05),EBHM治疗组、GSTT组之间数值差异无统计学意义(P>0.05),EBHM治疗组、GSTT组与正常对照组比较视网膜中MDA的含量仍略高(P<0.05),SOD的含量略降低(P<0.05)。结论:白蒺藜皂苷能有效提高慢性高眼压下兔视网膜中SOD活性,降低MDA含量,从而对持续性高眼压视网膜氧化应激具有保护作用。

Influence of gross saponins from tribulus terrestris L on SOD activity and MDA content for chronic high intraocular pressure in rabbit

AIM:To observe influence of gross saponins from tribulus terrestris L(GSTT)on SOD activity and MDA content for chronic high intraocular pressure in rabbit, and discusses the retina oxidative damage inhibition on chronic high intraocular pressure model of rabbit.

METHODS:Totally 24 healthy New Zealand rabbits were randomly divided into 4 groups: normal control group(A group); high intraocular pressure model blank group(B group); high intraocular pressure model with GSTT treated group(C group); high intraocular pressure model with Erigeron brevicapas hand mass(EBHM)treated group(D group). High intraocular pressure model was induced by 20g/L methylcellulose injection into the anterior chamber in B group, C group and D group. D group was injected 5 mg/kg GSTT and C group was injected 4.5mg/kg EBHM and measured intraocular pressure with Schiotz tonometer every day for 4 weeks. The retina tissue superoxide dismutase(SOD)and maleic dialdehyde(MDA)content were detected 28 days later.

RESULTS: After glaucoma model of rabbit eyes were established, the intraocular pressure during observation period was maintained in 32-39mmHg; High intraocular pressure model blank group and normal control group, EBHM treatment group, GSTT treatment group were compared, the differences of retina MDA, SOD content had statistical significance(P<0.05); numerical difference between EBHM treatment group and GSTT group was not statistically significant(P>0.05); EBHM treatment group, GSTT treatment group and normal control group were compared, the content of MDA in the retina was still slightly higher(P<0.05), the content of SOD slightly lower(P<0.05)

CONCLUSION: GSTT can effectively improve the retina SOD activity of chronic high intraocular pressure in rabbit and reduce the content of MDA, which has a protective effect of persistent high intraocular retinal oxidative stress.