简介:目的构建肺炎链球菌自溶素(pneumococcalautolysin,LytA)核酸疫苗,并研究其免疫原性。方法采用聚合酶链反应方法从肺炎链球菌基因组中克隆肺炎链球菌自溶素基因,然后将该基因插入到pVAX1真核表达载体中,构建表达LytA的重组质粒,制备成超螺旋比例大于90%的核酸疫苗。实验组:BALB/c小鼠5只,对其分3次肌内注射核酸疫苗(100μg);对照组:BALB/c小鼠5只,肌内注射pVAX1空载体(100μg)3次。分别采集小鼠血清,采用间接酶联免疫吸附方法测定血清LytA特异性抗体水平。结果扩增出的LytA基因(957bp)与基因库中LytA的编码序列(957bp)一致。成功构建了LytA核酸疫苗。实验组小鼠的血清LytA抗体水平明显高于对照组,差异有统计学意义(P〈0.01)。结论成功克隆了LytA基因,制备了LytA核酸疫苗,后者可在小鼠体内诱导较强的特异性体液免疫反应。
简介:目的探讨纤维蛋白封闭剂(fibrinsealing,FS)在功能性鼻内镜鼻窦手术中的临床应用价值。方法随机将163例行鼻内镜鼻窦手术患者分成FS组、Merocel高膨胀材料组和凡士林油纱条组,比较不同填塞材料的术后临床表现及远期影响。结果FS组在鼻内镜鼻窦手术中止血效果差于高膨胀材料及凡士林油纱条组,但术后头痛及鼻腔疼痛较轻,鼻黏膜反应轻,创口愈合快,鼻黏膜上皮化快,鼻腔粘连少。结论鼻内镜鼻窦手术中应用FS术后头痛及鼻黏膜反应轻,值得临床进一步实践、应用。
简介:目的探讨用改良圈匙娩核并注重粘弹剂应用对防止小切口非超声乳化白内障囊外摘出人工晶体植入术并发症的作用。方法用改良圈匙娩核并注重粘弹剂应用对355例白内障行小切口非超声乳化白内障人工晶体植入术。结果术后三天矫正视力≥0.5者291眼达82%,脱残339眼(95.5%)脱盲315眼(98.9%)。术后角膜水肿39眼,占10.98%均在3~6天后恢复透明。后囊破裂7眼,占1.97%,前房出血4眼,占1.13%。瞳孔轻度变形10眼,占2.8%,暂时性高眼压4眼,占1.13%。结论在行小切口白内障囊外摘出人工晶体植入时,应用改良后的圈匙娩核并注重粘弹剂应用,就会明显减少并发症,达到良好的效果。
简介:·AIM:Toexploretheeffectofimmunizationwithcopolymer-1(COP-1)andretinalstemcells(RSCs)transplantationoninterferon-gamma(IFN-γ)levelsinaratexperimentalglaucomamodel.·METHODS:Anexperimentalglaucomawasinducedbyargonlaserphotocoagulationoftheepiscleralveinsandlimbalplexusintherighteyeofrats.Immediatelyfollowingglaucomainduction,ratswereimmunizedwithCOP-1.RSCswereculturedandtransplantedintravitreallyintotheeyesofglaucomamodelanimals1weekpost-lasertreatment.Sixexperimentalgroupswereused:COP-1/RSC,PBS/RSC,COP-1/PBS,PBS/PBS,glaucomamodelgroup,andanormalcontrolgroup.TheconcentrationofIFN-γinaqueoushumor(AH)andserumwasmeasuredbyenzyme-linkedimmunosorbentassay(ELISA)ineachofthesixgroups.Retinalganglioncell(RGC)survivalwasassessedbyquantifyingapoptosisusingHoechststaining.·RESULTS:ConcentrationsofIFN-γinAHandserumofratsthathadundergoneglaucomainductionwerehigherthanthoseofnon-inducedcontrolrats.TheconcentrationsofIFN-γinAHandserumoftheCOP-1/RSCstreatedgroupweredeterminedtobe2371.9ng/Land710.9ng/L,respectively,whichweresignificantlylowerthanthoseintheothertreatedgroups(P<0.05).Infact,IFN-γlevelsinthedualtreatedgroupwerereducedtobackgroundlevels.TheCOP-1/RSCgrouphadlowernumberofapoptoticRGCsthantheotherthreeexperimentalgroups(P<0.05).·CONCLUSION:ThereducedlevelsofIFN-γinAHandserumoftheCOP-1/RSCgroupmayberelatedtosynergisticeffectsbetweenRSCstransplantationandCOP-1immunemodulation.ItislikelythatthelowerlevelsofIFN-γpreventedRGCsglaucomatousapoptosis.·