简介:目的建立海水浸泡颅脑挫裂伤模型,观察海水浸泡对实验性脑挫裂伤后创伤性脑水肿的影响及研究兔脑挫伤后不同时间caspase-8及caspase-3表达的变化。方法采用立体定向自由落体伤模型进行持续海水浸泡作为实验组,对照组采用同样的方法致伤后不进行海水浸泡。观察创伤组织的病理改变,并通过免疫组化染色和计算机图像分析技术用半定量化的方法检测不同干预不同时程caspase-8和caspase-3的活性表达强弱差异。结果实验组和对照组均发生了创伤性脑水肿.但水肿高峰期出现时间不一致,严重程度也不一致。实验组caspase-8和caspase-3活性表达强度均高于对照组。结论海水浸泡促进了挫裂伤周边缺血水肿区神经细胞凋亡的增加。
简介:摘要目的探讨不同级别胶质瘤中Caspase-8表达情况并分析与胶质瘤分级关系。方法选我院2012-2014年经病理证实的40例人脑胶质瘤组织标本和20例正常脑组织对照标本,其中低级别胶质瘤24例,高级别胶质瘤16例。采用免疫组化法检测脑组织中Caspase-8的表达。结果在低级别胶质瘤(LGG,I-Ⅱ级)和高级别胶质瘤(HGG,Ⅲ~Ⅳ级)中,Caspase-8的阳性率分别为83.3%(20/24)和50.0%(8/16)。胶质瘤病理分级越高,Caspase-8的阳性率越低(χ2=9.114,P=0.001<0.05)。胶质瘤的恶性程度与Caspase-8的表达呈负相关(γs=-0.417,P<0.01)结论胶质瘤细恶性程度与Caspase-8的表达呈负相关。
简介:摘要:目的:探讨中药烧伤膏对糖尿病并发皮肤溃疡小鼠创面抑制细胞凋亡作用及机理。方法:SPF级小鼠雄性40只,(STZ)诱导成模,将造模成功的糖尿病小鼠随机分为4组,每组10只;分别为模型组、湿润烧伤膏组)、康复新液照组、空白组,采用IHC法检测caspase3、caspase8的蛋白表达结果:湿润烧伤膏组,康复新液组溃疡面愈合量的比率明显优于模型组对照组(p
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简介:Apoptosisisprimarilyexecutedbyactivecaspases,whicharederivedfromtheinactiveprocaspasezymogensthroughproteolyticcleavage.Wedeterminedthecrystalstructuresofacaspasezymogen,procaspase-7,andanactivecaspase-7withoutanyboundinhibitors.Comparedtotheinhibitor-boundcaspase-7,procaspase-7zymogenexhibitssignificantstructuraldifferencessurroundingthecatalyticcleft,whichprecludestheformationofaproductiveconformation.Proteolyticcleavageinbetweenthelargeandsmallsubunitsallowsrearrangementofessentialloopsintheactivesite,primingactivecaspase-7forinhibitor/substratebinding.Strikingly,bindingbyinhibitorscausesa180-degree-flippingoftheN-terminusinthesmallsubunit,whichinteractswithandstabilizesthecatalyticcleft.Theseanalysesrevealthestructuralmechanismsofcaspaseactivationanddemonstratethattheinhibitor/substratebindingisaprocessof
简介:目的人胃癌组织中caspase-3表达的研究。探讨caspase-3表达-9胃癌预后的关系。方法应用免疫组织化学ABC法检测人胃癌组织中caspase-3的表达情况。结果周围正常胃粘膜上皮caspase-3阳性率为94/99(94.9%),胃癌组织中caspase-3的阳性率为62/99(63.5%),较周围正常胃粘膜上皮明显降低(P〈0.05)。caspase-3的表达与胃癌的预后指标(如组织学类型,TNM分期等)明显相关性。结论人胃癌组织中caspase-3的表达较低。这一结果提示caspase-3低表达导致的细胞凋亡异常降低及增生过度可能是胃癌的发病原因之一。这一结果亦提示caspase-3与胃正常粘膜及肿瘤细胞的凋亡有关。Caspase-3可能是胃癌的预后指标之一。
简介:IAPs(inhibitorsofapoptosis)areafamilyofproteinscontainingoneormorecharacteristicBIRdomains.Theseproteinshavemultiplebiologicalactivitiesthatincludebindingandinhibitingcaspases,regulatingcellcycleprogression,andmodulatingreceptor-mediatedsignaltransduction.OurrecentstudiesfoundtheIAPfamilymembersXIAPandc-IAP1areubiquitinatedanddegradedinproteasomesinresponsetoapoptoticstimuliinTcells,andtheirdegradationappearstobeimportantforTcellstocommittodeath.InadditiontothreeBIRdomains,eachoftheseIAPsalsocontainsaRINGfingerdomain.Wefoundthisregionconfersubiquitinproteaseligase(E3)activitytoIAPs,andisresponsiblefortheauto-ubiquitinationanddegradationofIAPsafteranapoptoticstimulus.GiventhefactthatIAPscanbindavarietyofproteins,suchascaspasesandTRAFs,itwillbeofinteresttocharacterizepotentialsubstratesoftheE3activityofIAPsandtheeffectsofubiquitinationbyIAPsonsignaltransduction,cellcycle,andapoptosis.
简介:4+4等于8,2+6等于8,6+2也等于8,但有人却奇迹般地让2+6或6+2大于了4+4,这是为什么呢?事情还要从美国的金门大桥说起。金门大桥是“4+4”8车道模式,但由于上下班的车流在不同时段出现两个半边分布不均匀的现象,
简介:AIM:Toevaluatetheroleofsurvivinandcaspase-3inapoptosisofgastriccarcinoma,aswellasinprognosisofpatientswithgastriccarcinoma.METHODS:Expressionsofsurvivinandcaspase-3wereinvestigatedimmunohistochemicallyin80gastriccarcinomapatientswithoutahistoryofchemo-radiationtherapy.TumorcellapoptosiswasexaminedbyTUNELmethod.RESULTS:Immunohistochemicalanalysisshowedthatsurvivinexpressionwaspositivein61of80patients(76%)withgastriccarcinoma.Incontrast,noexpressionofsurvivininadjacentnormaltissueswasdetected.Expressionlevelofcaspase-3washigherinnormaltissuesthanincarcinoma.Patientswithhigherexpressionofsurvivinhadworsehistologicalgradesandpathologicalstages.Expressionofcaspase-3wassignificantlyassociatedwithhistologicalstages,butnotwiththepathologicalstages.Althoughsurvivinexpressionincarcinomawasnotinverselyrelatedtocaspase-3,patientswithsurvivin(-)andcaspase-3(+)hadthemaximumapoptosisindex.CONCLUSION:Expressionlevelofsurvivinwasassociatedwithhistologicalgradesandpathologicalstagesofthetumor,indicatingthatsurvivinmaybeapoorprognosisfactorforgastriccarcinoma.Unlikecaspase-3,survivin(anapoptosisinhibitor)canmarkedlyinhibittheapoptosisoftumorcells.
简介:摘要目的探讨Caspase-3、Caspase-9、Bcl-2蛋白对骨质疏松症发病机理的影响。方法收集20例患者(骨质疏松症组、正常组各10例)髋关节置换手术中取下股骨头或股骨颈中松质骨,分别进行成骨细胞体外培养,通过ELISA方法检测正常人和骨质疏松症患者成骨细胞中Caspase-3、Caspase-9、Bcl-2蛋白表达情况。结果对比于正常组,骨质疏松症组中Caspase-3、Caspase-9的表达较正常组增高,差异有统计学意义(P<0.05),而Bcl-2表达水平在骨质疏松症组中较正常组下降,差异亦有统计学意义(P<0.05)。结论在骨质疏松症的成骨细胞凋亡过程中,Caspase依赖性凋亡途径激活,而Bcl-2途径受到抑制。