学科分类
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500 个结果
  • 简介:Thedamageofhumancornealcellsencounterwiththeproblemofavailabilityofcornealcellsforreplacement.Limitationofthesourceofcornealcellshasbeenrealized.Anattemptofdevelopmentofcornealepithelial-likecellsfromthehumanskin-derivedprecursor(hSKPs)hasbeenmadeinthisstudy.Combinationofthreeessentialgrowthfactors:epidermalgrowthfactor(EGF),keratinocytegrowthfactor(KGF)andhepatocytegrowthfactor(HGF)coulddemonstratesuccessfullyinductionofhSKPstodifferentiationintocornealcells.Theinducedcellsexpressedtheappearanceofmarkersofcornealepithelialcellsasshownbythepresenceofkeratin3(K3)byantibodylabelandWesternblotassay.TheK3geneexpressionofinducedhSKPscellsasshownbyreversetranscription-polymerasechainreaction(RT-PCR)technologywasalsodemonstrated.ThepresenceofthesemarkersatbothgeneandproteinlevelscouldleadtoourconclusionthatthedirectionaltransdifferentiationofhSKPscellsintocornealepithelialcellswassuccessfullydoneunderthiscellinductionprotocol.Thefindingshowsanewlyavailablestemcellsourcecanbeobtainedfromeasilyavailableskin.Cellsfromautologoushumanskinmightbeusedforcornealdisordertreatmentinfutureclinicalapplication.

  • 标签: CORNEAL epithelial-like CELL human skin-derived PRECURSOR
  • 简介:AIM:Toestablishanuntransfectedhumancornealstromal(HCS)celllineandcharacterizeitsbiocompatibilitytoacellularporcinecornealstroma(aPCS).·METHODS:PrimaryculturewasinitiatedwithapurepopulationofHCScellsinDMEM/F12media(pH7.2)containing20%fetalbovineserumandvariousnecessarygrowthfactors.Theestablishedcelllinewascharacterizedbygrowthproperty,chromosomeanalysis,tumorigenicityassay,expressionofmarkerproteinsandfunctionalproteins.Furthermore,thebiocompatibilityofHCScellswithaPCSwasexaminedthroughhistologicalandimmunocytochemistryanalysesandwithlight,electronmicroscopies.·RESULTS:HCScellsproliferatedtoconfluence2weekslaterinprimarycultureandhavebeensubculturedtopassage140sofar.AcontinuousuntransfectedHCScelllinewithapopulationdoublingtimeof41.44hoursatpassage80hasbeendetermined.Resultsofchromosomeanalysis,morphology,combinedwiththeresultsofexpressionofmarkerproteinandfunctionalproteinssuggestedthatthecellsretainedHCScellproperties.Furthermore,HCScellshavenotumorigenicity,andwithexcellentbiocompatibilitytoaPCS.·CONCLUSION:Anuntransfectedandnon-tumorigenicHCScelllinehasbeenestablished,andthecellsmaintainedpositiveexpressionofmarkerproteinsandfunctionalproteins.Thecellline,withexcellentbiocompatibilitytoaPCS,mightbeusedforinvitroreconstructionoftissue-engineeredHCS.

  • 标签: human CORNEAL STROMAL cells cell line
  • 简介:AIM:Todemonstratethemorphologyandstructureofinvitroreconstructedtissue-engineeredhumancornealepithelium(TE-HCEP)withseedercellsfromanuntransfectedHCEPcellline.·METHODS:TheTE-HCEPswerereconstructedinvitrowithseedercellsfromanuntransfectedHCEPcellline,andscaffoldcarriersofdenudedamnioticmembrane(dAM)inair-liquidinterfaceculturefor3,5,7and9days,respectively.Thespecimenswereexaminedwithhematoxylin-eosin(HE)stainingofparaffin-section,immunocytochemicalstaining,scanningandtransmissionelectronmicroscopy.·RESULTS:DuringinvitroreconstructionofTE-HCEP,HCEPcellsformeda3-4,6-7and8-10layersofanHCEP-likestructureondAMsinair-liquidinterfaceculturefor3,5and7days,respectively.Butthecellsdeceasedto5-6layersandthestructureofstraifiedepitheliumbecamelooseatday9.Andthecellsmaintainedpositiveexpressionofmarkerproteins(keratin3andkeratin12),cell-junctionproteins(zonulaoccludens-1,E-cadherin,connexin43andintegrinβ1)andmembranetransportproteinofNa+-K+ATPase.TheHCEPcellsinTE-HCEPwererichinmicrovillionapicalsurfaceandestablishednumerouscell-cellandcell-dAMjunctionsatday5.·CONCLUSION:ThemorphologyandstructureofthereconstructedTE-HCEPweresimilartothoseofHCEPinvivo.TheHCEPcellsinthereconstructedTE-HCEPmaintainedthepropertiesofHCEPcells,includingabilitiesofformingintercellularandcell-extracellularmatrixjunctionsandabilitiesofperformingmembranetransportation.TheuntransfectedHCEPcellsanddAMscouldpromisinglybeusedinreconstructionHCEPequivalentforclinicalcornealepitheliumtransplantation.

  • 标签: tissue-engineered HUMAN CORNEAL epithelium in VITRO
  • 简介:AIM:Toinvestigatethelevelsofserumsolubleintercellularadhesionmolecules-1(sICAM-1)andneutrophilicexpressionofCD18inpatientswithvariousstagesofdiabeticretinopathyandtodeterminetheirdifferentexpressionpatterninthedevelopmentofdiabeticretinopathy(DR).·METHODS:LevelsofserumsICAM-1andCD18onthesurfaceofneutrophileweremeasuredin41DRpatients,theywereclassifiedinthreesubgroupsaccordingtothestageofretinopathyasdeterminedbyfund’sophthalmoscopy;10controlsubjectswerealsostudied.sICAM-1weremeasuredbyenzyme-linkedimmunosorbentassayandCD18byflowcytometry.·RESULTS:TheneutrophilicCD18expressionandserumsICAM-1levelwereallsignificantlyelevatedinalldiabeticsubgroupscomparedtocontrolsubjects(P<0.01).ThedifferencesofCD18andsICAM-1amongthediabeticsubgroupsweresignificantinCD18butnotinsICAM-1.TheprogressionofretinopathywasassociatedwithanincreasebothinCD18andinsICAM-1levelsbysimplecorrelationanalysis(β=0.74,P<0.001;β=0.38,P<0.01,respectively).ButstepwisemultipleregressionanalysisrevealedthatonlyCD18wasindependentdeterminantofretinopathy(β=1.04,P<0.01).·CONCLUSION:OurresultsconfirmthecontributionofendothelialandneutrophilicactivationinthedevelopmentofDRasindicatedbyincreasedlevelsofCD18andsICAM-1.However,adirectimplicationofCD18andICAM-1intheprogressionofDRcanbesupportedonlyintheCD18butnotICAM-1.CD18andICAM-1mayplaydifferentroleinthedevelopmentofdiabeticretinopathy.

  • 标签: diabetic RETINOPATHY serum soluble INTERCELLULAR adhesion
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  • 简介:在我家里挂着这样一幅字:“不积小流,无以成江海,不积跬步,无以至千里。”爸爸说:“它告诉我们凡事要从小做起。”

  • 标签: 小学生 作文 语文学习 阅读知识
  • 简介:生她时,父亲已年过50,所以急着望女成凤吧,4岁就训练她跑步,5岁时一天就要跑3小时,6岁时她就开始参赛,背负着爸爸希望,完成了42公里马拉松。

  • 标签: 小学生 作文 语文学习 阅读知识
  • 简介:大眼睛,塌鼻子,小嘴巴。这就是我形象。真是无巧不成书——我写字就和我形象一样:“眼睛”大、“鼻子”塌、“嘴巴”小。用两个字概括,就是:难看。世界上恐怕很难找到一个天生写好字的人。好字是后天练出来,不是先天带来。我毛病恐怕就出在这个“练”字上——练得不认真。

  • 标签: 形象 “眼睛” “练” 鼻子
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  • 简介:画完《湘江·1934》之后,张庆涛病倒。这场画布上"战争",没有硝烟炮火,没有人喊马嘶……这是张庆涛一个人"战争",他"运筹"了23年,"策划"了3年,"厮杀"了1年。立身在220cm×470cm画布前,他具有了化身伟人或士兵自由,他既要如演员般地去体会画中人物情绪和心境,又要如美工般地营造紧张危难场景和氛围,更要如导演般地将整个画面调度、

  • 标签: 史诗 大海 战争 士兵
  • 简介:口语课上,大家正进行口头表达训练,这次讨论主题是“我最喜欢老师”。轮到皮皮猴了,他站起来清了清嗓子说:“我最喜欢大象老师。

  • 标签: 口头表达 口语课 老师
  • 简介:那是1987年,我读小学三年级。老师让我加入学校“小蕾”校刊通讯组,我成了学校校刊通讯员之一。同年“六一”儿童节,我们在老师带领下,跟着大队人马来到剧院参加《小花朵》优秀作品领奖会。看着喜气洋洋上去领奖同学们,我真是好羡慕啊。

  • 标签: “六一”儿童节 成长 小学三年级 优秀作品 通讯员 校刊
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  • 简介:我向来认为,诗人是天生——任何后天修炼与模仿可以产生诗作,但诞生不了真正诗人,有些诗作永远在三流水平徘徊,那必定因为作者不是一个天生诗人,这样的人还是不写为妙。天生诗人即使不写诗也能让你感到诗歌律动,天生诗人一旦写作,语词就会散发一种光芒,朴素内敛,不动声色中自有无尽诗性绵延,这样品质不会因岁月更替、环境变迁而被损伤。小海就是这样诗人。

  • 标签: 诗人 天生 灵魂 歌唱 诗作 诗歌
  • 简介:<正>生活中,一些细节却能折射出真善美。社会每个角落里都流动着动人歌,就像一首歌中唱到:"只要人人都献出一点爱,世界就会变成美好明天。"爱是推动社会走向文明、进步催化剂。过去,雷锋精神是人们学习榜样。他曾经帮助过许多人,他助人为乐,舍己为人,许多人都以他为榜样。

  • 标签: 催化剂 真善美 雷锋精神 社会走向 力量 无穷
  • 简介:没钱时候,养鸡;有钱时候,养狗。没钱时候,在家里吃泡饭:有钱时候,在酒店吃泡饭,没钱时候,墙角下蹲着打玻璃弹子:有钱时候,草原上立着打高尔夫球。没钱时候,在马路上骑自行车:

  • 标签: 高尔夫球 自行车 养狗
  • 简介:昨天,我们送走了动荡2011年,送走了一年辛劳,收获了一年成果,今天,伴随着读者脚步,带着新希望,我们走进了转型2012年。挑战——应对——进步……人类就在这样循环中不断前进,不断成长。成功喜悦意味着更大挑战,失败苦涩则为我们指出成功方向。就这样,承载着70亿乘客地球方舟在挑战与希望中驶向2011年行进终点,开启了2012年新航程。

  • 标签: 《UPS应用》 期刊 编辑部 读者
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  • 简介:摘要归根结底,摄影艺术就是光艺术,是运用光艺术。运用好光前提条件是探究摄影本质、了解光性质、最后理解光表达效果所要依靠等一系列问题,从而为我们提高摄影艺术表现力和感染力做好理论准备。

  • 标签: 摄影光表达效果
  • 简介:近年来,穿越剧流行于各大主流电视台,频频占据同时段收视率榜首,同时以迅雷不及掩耳之势成为了观众期待和关注影视剧中之一。穿越剧既有激发大众学习历史、慰藉情感和点亮主体意识积极影响,也会导致价值判断感性化、文化观念娱乐化、生活观念享乐化、价值主体自我化、脱离现实浪漫化等消极影响。

  • 标签: 穿越剧热播 感想 发展态势