简介:目的:观察链脲佐菌素(STZ)诱发糖尿病大鼠在造模后血-视网膜屏障(blood—retinabarrier,BRB)变化情况,并以阳性药为对照研究中药芪灯明目胶囊对STZ诱发糖尿病大鼠的视网膜血管渗漏影响。方法:采用STZ腹腔注射制作糖尿病大鼠模型,在造模后6too内各时点(2wk;1,2,3,4,5,6mo)采用伊文思蓝灌注示踪显示血一视网膜的渗漏情况,在造模后3too开始用中药芪灯明目胶囊(低中高剂量组分别给予125,250,500mg/kg体质量剂量的胶囊内容物灌胃),对照组用安多明胶囊(200mg/kg体质量剂量,相当于10倍成人剂量),灌胃3mo,观察药物对BRB的影响。结果:STZ糖尿病大鼠在2wk即可出现BRB的损害,并随着高血糖状态的持续而不断加重。对造模3tooSTZ糖尿病模型大鼠连续灌胃中药芪灯治疗3mo,结果提示:中药芪灯对STZ糖尿病BRB有保护作用,可明显减少视网膜血管的渗漏。结论:STZ糖尿病模型大鼠在早期即可出现BRB损害,并随着高血糖的持续而加重,中药芪灯明目胶囊可减少高血糖导致的BRB损害。
简介:目的:观察不同浓度葛根素对体外培养的牛视网膜血管内皮细胞舒缩因子的影响。方法:取第8代牛视网膜血管内皮细胞用于实验。实验组中加入含不同浓度葛根素的培养液,对照组加入不含药物、无生长因子及血清的培养液。培养48h后用Westernblotting法测各组细胞eNOS及ET-1的表达。结果:与阴性对照组比较,葛根素组eNOS的相对表达量均升高(P〈0.01),且随着药物浓度的增加eNOS的表达也增加。葛根素组ET-1的相对表达量均降低(P〈0.01),且随着药物浓度的增加ET-1表达下降。结论:葛根素通过上调eNOS的表达,下调ET-1的表达,调节血管一氧化氮内皮素(NO/ET)的比值,从而发挥松弛视网膜血管平滑肌的作用。
简介:AIM:ToexploretheinhibitoryeffectofasustainedcyclosporinA(CsA)deliverymicrosphere(CsA-MS)onposteriorcapsularopacification(PCO)inrabbiteyesaftercataractextraction.·METHODS:TwentyNewZealandwhiterabbitsacceptedcataractextractionplusintraocularlensimplantationandtheirlefteyeswereintraoperativelyinjectedCsA-MSpreparedusingpolymerpolylactioglycolicacid(PLGA)asacarrierandtheirrighteyeswereinjectedwithemptyMS.Thechangesincornea,anteriorchamberreaction,intraocularpressure,PCOandCsAconcentrationinaqueoushumorwereexaminedpostoperativelyandalltheeyeswereenucleated3monthsaftersurgeryforhistopathologicalandmorphologicalexaminationwithlightmicroscopyandelectronmicroscopy.·RESULTS:Conjunctivalhyperemia,cornealedema,intraocularpressureandanteriorchamberresponseofexperimentalandcontroleyesweresimilar,whilePCOinCsAMSinjectedeyeswasgreatlyimprovedcomparedwiththatincontroleyes.PosteriorcapsulesinCsA-MSinjectedeyesweresmoothandlensepithelialcells(LEC)didnotproliferatesignificantly(P>0.05),whileLECinposteriorcapsuleofcontroleyeshaddifferentdegreesofproliferationandcorticalregeneration.LECinCsA-MSinjectedeyeswerenotfunctionallyactiveandunderwentapoptosis,whereasLECincontroleyeswerefunctionallyactive(F-test,P=0.025).Inaddition,thecornealultrastructureshowednodifferencesbetweenCsA-MSandMSinjectedeyes.CONCLUSION:CsA-MShashighbioavailabilityinrabbiteyesandcouldinhibitpostoperativePCOoccurrenceanddevelopmentduringthestudyperiod,suggestingthatCsA-MSmaybeapromising,effectiveandsafeadministrationroutetopreventPCOinclinic.
简介:目的:研究家兔静脉注射头孢哌酮钠/舒巴坦钠在眼内的透过性及蓄积作用。方法:用高效液相色谱法(highperformanceliquidchromatography,HPLC)测定给药后不同疗程时间点各组兔眼房水和玻璃体中的药物浓度。结果:房水中舒巴坦钠的药物浓度分别为23.4±4.8和23.6±3.7mg/L;头孢哌酮钠浓度分别为8.9±1.2和8.9±1.7mg/L;玻璃体中舒巴坦钠浓度分别为71.2±4.6和69.3±6.8mg/L,头孢哌酮钠未检出。结论:头孢哌酮Ca/舒巴坦钠静脉注射后在正常的眼内透过性不良。