简介:目的:建立链脲佐菌素(streptozotocin,STZ)诱导的小鼠增殖性糖尿病视网膜病(proliferativediabeticretinopathy,PDR)动物模型,并观察在增殖性糖尿病视网膜病发生、发展过程中血管内皮生长因子(vascularendothelialgrowthfactor,VEGF)及其受体(VEGFR1,VEGFR2),金属基质蛋白酶(matrixmetalloproteinase,MMP)2,MMP9表达的变化。方法:C57BL/6J小鼠连续5d腹腔注射STZ(55mg/kg)。末次注射后7d检测血糖浓度。糖尿病诱导成功的小鼠和正常小鼠继续饲养3~5mo。实验结束后进行视网膜病理组织观察,并利用CD31免疫荧光染色检测视网膜血管的分布情况。采用实时定量荧光PCR分析检测VEGF,VEGFR1,VEGFR2,MMP2,MMP9的基因表达。结果:视网膜组织病理观察和CD31免疫荧光染色实验结果均表明5月龄的糖尿病小鼠视网膜组织中血管数目明显比同月龄正常小鼠多。同时,与同月龄正常小鼠相比,5月龄糖尿病小鼠视网膜组织中VEGF,VEGFR1,VEGFR2,MMP2,MMP9的基因表达也明显增加。结论:本研究表明STZ诱导的糖尿病小鼠在5月龄时发生了增殖性糖尿病视网膜病的病变,期间视网膜组织中VEGF,VEGFR1,VEGFR2,MMP2,MMP9的基因表达都明显增加。
简介:AIM:Tostudythedistributionofocularhigher-orderaberrations(HOAs)andmesopicpupilsizeinindividualsscreenedforrefractivesurgery.·METHODS:OcularHOAsandmesopicpupilsizewerestudiedin2458eyesof1240patientswithmyopia,myopicastigmatismandcompoundmyopicastigmatismand215eyesof110patientswithhyperopia,hyperopicastigmatismandcompoundhyperopicastigmatismusingtheZywaveaberrometer(Busch&Lomb).Allpatientshadcorrectablerefractiveerrorswithoutahistoryofrefractivesurgeryorunderlyingdiseases.Root-mean-squarevaluesofHOAs,totalsphericalaberration,totalcomaandmesopicpupilsizewereanalyzed.OcularHOAsweremeasuredacrossa≥6.0mmpupil,andpupilsizemeasurementswereperformedunderthemesopiccondition.·RESULTS:ThemeanvaluesofHOAs,totalsphericalaberrationandtotalcomainthemyopicgroupwere0.369μm,±0.233,0.133±0.112μmand0.330±0.188μm,respectively.InthehyperopicgroupthemeanvaluesofHOAs,totalsphericalaberrationandtotalcomawere0.418μm±0.214,0.202±0.209μmand0.343±0.201μm,respectively.HyperopesshowedgreatertotalHOAs(P<0.01)andtotalsphericalaberration(P<0.01)comparedtomyopes.Inage-matchedanalysis,onlytheamountoftotalsphericalaberrationwashigherinthehyperopicgroup(P=0.05).Mesopicpupilsizeinthemyopicgroupwaslarger(P≤0.05).·CONCLUSION:TheresultssuggestedthatsignificantlevelsofHOAswerefoundinbothgroupswhichareimportantforplanningrefractivesurgeriesonIranians.Thereweresignificantlyhigherlevelsoftotalsphericalaberrationinhyperopescomparedtomyopes.Mesopicpupilsizewaslargerinmyopicgroup.