简介：Apoptosismanifestsintwomajorexecutionprogramsdownstreamofthedeathsignal:thecaspasepathwayandorganelledysfunction.Animportantantiapoptosisfactor,Bcl-2protein,contributesincaspasepathwayofapoptosis.Calcium,animportantintracellularsignalelementincells,isalsoobservedtohavechangesduringapoptosis,whichmaybeaffectedbyBcl-2protein.WehavepreviouslyreportedthatinHarringtonine(HT)inducedapoptosisofHL-60cells,there'schangeofintracellularcalciumdistribution,ovingfromcytoplastespeciallyGolgi'sapparatustonucleusandaccumulatingtherewiththehighestconcentration.Wereportherethatcaspase-3becomesactivatedinHT-inducedapoptosisofHL-60cells,whichcanbeinhibitedbyoverexpressionofBcl-2protein.NosignofapoptosisorintracellularcalciummovementfromGolgi'sapparatustonucleusinHL-60cellsoverexpressingBcl-2ortreatedwithAc-DEVD-CHO,aspecificinhibitorofcaspase-3.Theresultsindicatethatactivatedcaspase-2canpromotethemovementofintracellularcalciumfromGolgi'sapparatustonucleus,andtheprocessisinhibitedbyAc-DEVD-CHO(inhibitorofcaspase-3),andthatBcl-2caninhibitthemovementandaccumulationofintracellularcalciuminnucleusthroughitsinhibitiononcaspase-3.Calciumrelocalizationinapoptosisseemstobeirreversible,whichisdifferentfromtheintracellularcalciumchangescausedbygrowthfactor.

简介：TherearetwopossibleoutcomeswhenDNAdamageoccursinnormalmammaliancells:eitherinductionofcell-cyclecheckpointwhichinhibitstheprogressofthecellcyclesaswellasactivatesDNArepairpathways,oractivationofapoptosistoeliminatedamagedcells.Thep53tumour-suppressorgeneplaysakeyroleinselectingthesepathways.Inourpresentworks,thehumangastriccancercelllineAGSwastreatedwithtripchlorolide,apotentantitumorcompoundpurifiedfromaChineseherbTripterygiumWilfordiiHook.Singlecellgelelectrophoresis(Cometassay)showedthatthetreatmentoftripchlorolideresultedinDNAdamageinAGScells.ThedamagedAGScellswentthroughapoptosis,whichwastime-anddose-dependent.

简介：Recentstudiesindicatethatcell-cyclecheckpointsaretightlycorrelatedwiththeregulationofapoptosis,inwhichp53playsanimportantrole.OurpresentworksshowthattheexpressionofE6/E7oncogenesofhumanpapillomavirusinHeLacellsisinhibitedinthepresenceofanti-tumorreagenttripchlorolide(TC),whichresultsintheup-regulationofp53inHeLacells.Interestingly,underthesameTC-treatment,thecellsattheearlyS-phasearemoresusceptibletoapoptosisthanthoseatthemiddleS-phasealthoughp53proteinisstabilizedtothesamelevelinbothsituations.Significantdifferenceisexhibitedbetweenthetwospecifiedexpressionprofiles.Furtheranalysisdemonstratesthatanti-apoptoticgenesurvivinisup-regulatedbyp53intheTC-treatedmiddle-Scells,whereasitisdown-regulatedbyp53intheTC-treatedearly-Scells.Takentogether,thepresentstudyindicatesthatthedifferentialp53-regulatedexpressionofsurvivinatdifferentstagesofthecellcycleresultsindifferentcellularoutputsunderthesameapoptosis-inducer.

简介：人的免疫不全病毒类型1(HIV-1)Vpr导致房间死亡在哺乳动物并且分裂酵母房间，建议那Vpr可以影响一个保存细胞的过程。然而，导致Vpr的酵母房间死亡是否在哺乳动物的房间模仿调停Vpr的apoptosis，是不清楚的。我们最近识别了很多Vprsuppressors不仅在分裂酵母压制导致Vpr的房间死亡，而且在哺乳动物的房间堵住导致Vpr的apoptosis。这些调查结果建议在酵母的导致Vpr的房间死亡可以类似于一些哺乳动物的房间的apoptotic过程。这研究的目标是为apoptosis的未来研究开发并且验证一个分裂酵母模型系统。类似于在哺乳动物的房间的导致Vpr的apoptosis，我们这里证明在分裂酵母的Vpr支持phosphatidylserine外表表现并且导致线粒体的hyperpolarization，导致mitochondrial膜潜力的变化。而且，反应的氧种类(ROS)的Vpr扳机生产，显示象apoptotic一样细胞死亡可能被ROS调停。有趣地，Vpr在可以为在分裂酵母测量象apoptotic一样过程提供一个简单标记的线粒体导致唯一的词法变化。验证这可能性，我们测试了二Vprsuppressors(EF2和Hsp16)除了最新识别的Vprsuppressor(Skp1)在哺乳动物的房间压制导致Vpr的apoptosis。所有三蛋白质废除了房间死亡由Vpr调停了并且在酵母房间恢复了正常mitochondrial形态学。在结论，在分裂酵母的导致Vpr的房间死亡类似于哺乳动物的apoptotic过程。分裂酵母可以潜在地因此为Vpr和另外的proapoptotic代理人导致的象apoptotic一样过程的未来学习被用作一个简单模型有机体。

简介：Formationofapoptoticbodiesisatypicalcharacterofapoptoticcelldeath,buthowtheprocessesarecontrolledisnotknown.Inthisstudy,wecomparedtwoapoptosisinducingsystemsinvascularendothelialcells(VEC).Wefoundthattheformationofapoptoticbodiesduringapoptosisinducedbyrattlesnakevenom,whichisanuniqueandspecificapoptosisinducertovascularendothelialcells,wasmuchfasterthanthatinducedbydeprivationofsurvivalfactors(aFGFandserum).WhenweblockedthesynthesisofmRNAsincellstreatedwithrattlesnakevenombyDRB(5,6-dichloro-1-β-D-ribofuranosylbenzimidazole),aninhibitoroftranscription,theformationofapoptoticbodieswasdramaticallyinhibited.WeexaminedtheexpressionofP^53geneandfoundthatitsexpressionwasmuchhigherinapoptosisinducedbyrattlesnakevenomthatthatinapoptosisinducedbydeprivationofaFGFandserum.OurresultssuggestthatgeneexpressionisimportantandP^53genemayplayamajorroleininducingtheformationofapoptoticbodiesinVEC.

简介：肿瘤坏死因素(TNF)联系了导致apoptosisligand(TRAIL/APO2L)是在血缘的死亡受体的约会之上导致apoptosis的TNF基因总科的一个成员。当小道对正常房间相对无毒时，它有选择地在许多转变房间导致apoptosis。不过，胸肿瘤房间对小道的效果特别地抵抗。这里，我们报导在有cyclin依赖的kinase禁止者roscovitine的联合，落后于的暴露在检验的小道抵抗的乳癌房间线的多数导致了显著apoptosis。Roscovitine便于小道导致死亡的发信号的复杂形成和caspase-8的激活。FLICE禁止的蛋白质是的cFLIP(L)和cFLIP显著地下面调整的列在后面暴露到roscovitine并且，确实由siRNA的cFLIPisoforms击倒敏化的胸肿瘤房间到导致小道的apoptosis。另外，我们证明roscovitine强烈在胸肿瘤房间压制了Mcl-1表示和起来调整的E2F1蛋白质层次。显著地，由siRNA的Mcl-1的silencing敏化胸肿瘤房间到导致小道的apoptosis。而且，由减少的siRNA的E2F1蛋白质击倒在导致小道的apoptosis的roscovitine的敏化的效果。在摘要，我们的结果为roscovitine的pro-apoptotic影响揭示pleitropic机制，加亮它象在在有小道的联合的乳癌的一个反肿瘤代理人的潜力。

简介：Theeventsofcelldeathandtheexpressionofnuclearmatrixprotein(NMP)havebeeninvestigatedinapromyelocyticleukemiccelllineHL-60inducedwithetoposide.BymeansofTUNELassay,thenucleidisplayedacharacteristicmorphologychange,andtheamountofapoptoticcellsincreasedearlyandreachedmaximunabout39%aftertreatmentwithetoposidefor2h.NucleosomalDNAfragmentationwasobservedaftertreatmentfor4h.ThemorphologicalchangeofHL-60cells,thus,occurredearlierthantheappearanceofDNAladder.Totalnuclearmatrixproteinswereanalyzedby2-dimensionalgelelectrophoresis.Differentialexpressionof59nuclearmatrixproteinswasfoundin4hetoposidetreatedcells.Westernblottingwasthenperformedonthreenuclearmatrixacssociatedproteins,PML,HSC70andNuMA.TheexpressionofthesuppressorPMLproteinandheatshockproteinHSC70weresignificantlyupregulatedafteretoposidetreatment,whileNuMA,anuclearmitoticapparatusprotein,wasdownregulated.Theseresultsdemonstratethatsignificantbiochemicalalterationsinnuclearmatrixproteinstakeplaceduringtheapoptoticprocess.

简介：Itiswellknownthatduringmammalianovarianfolliculardevelopment,themajorityoffolliclesundergoatresiaatvariousstagesoftheirdevelopment.However,themechanismscontrollingthisselectionprocessremainunknown.Inthisstudy,weinvestigatedapoptosisingranulosacellsduringgoatfollicularatresiabyterminaldeoxynucleotidyltransferase-mediateddUTPnickendlabeling(TUNEL).Thechangesinthelevelsofsteroids,insulin-likegrowthfactors(IGFs)andIGFreceptorswerestudiedbyradioimmunoassay(RIA)andsemi-quantitativereversetranscription-PCR.Wefoundthatthepercentageofapoptoticgranulosacellsintheatretic(A)follicleswassignificantlyhigherthanthatintheslightlyatretic(SA)andhealthy(H)follicles.ThelevelofestradiolandtheratioofestradioltoprogesteroneinHfolliclesweresignificantlyhigherthanthoseinAfollicles.Ontheotherhand,thelevelofprogesteronewasnotsignificantlydifferentamongthesefollicletypes.WealsofoundthatthelevelofIGF-IinHfollicleswashigherthaninSAandAfollicles,whereastheamountofIGF-Ⅱdidnotvarysignificantly.TheexpressionofIGFreceptoralsodecreasedinAfolliclesascomparedtothatinHandSAfollicles.TheseresultssuggestedthatestradiolandIGF-Imightbeinvolvedincontrollingapoptosisingranulosacellsduringfollicularatresia.

简介：Acanthamoebaarefree-livingprotozoaorganismsthatliveabroadinnature.PathogenicAcanthamoebacancauseafatalgranulomatousamoebicencephalitisandkeratitis.SomespeciesofAcanthamoebacaninducesometumorcellsapoptosisinvitro.Prom1996wehaveprovedthatAcanthamoebaLstrain(A.lugdunensis-A.quina),firstlygotbyusfromkeratitispatientsinChina,couldinducetumorcells'apoptosis,includingPC12,B16cellsetal.InthisresearchweprovedthatboththebodyandthelysisofAcanthamoebacouldinducemousemelanomaB16cellsapoptosis.Buttheapoptosismechanismwaspoorlyunderstood.

简介：Apoptosisplaysanimportantroleinembryonicdevelopment,tissueremodeling,immuneregulationandtumorregression.Twogroupsofmolecules(Bcl-2familyand“Deathfactor”family)areinvolvedinregulatingapoptosis.InordertoknowabouttheeffectofBcl-2onapoptosisinducedbyFas,atypicalmemberof“Deathfactor”family,thetransfectionexperimentswithexpressionvectorspcDNA3-flandpcDNA3-bcl-2wereperformedinBEL-7404cells,ahumanhepatocellularcarcinomacelllinewhichexpressesendogenousFas,butnotFasLandBcl-2.ThedatashowedthattheexpressionofFasLinpcDNA3-fltransfectedhepatomacellsobviouslyinducedtheapoptosisofthecells.However,theoverexpressionofBcl-2inpcDNA3-bcl-2transfected7404/b-16cellscounteractedpcDNA3-fltransienttransfectionmediatedapoptosis.FurtherstudybycotransfectionexperimentsindicatedthatBidbutnotBax(bothwerepro-apoptoticproteinsofBcl-2family)blockedtheinhibitoryeffectofBcl-2onFas-mediatedapoptosis.TheseresultssuggestedthatFas-mediatedapoptosisinhumanhepatomacellsispossiblyregulatedbyBcl-2familyproteinsviamitochondriapathway.

简介：门高血压(PHT)gastropathy是肝肝硬化的经常的复杂并发症，带之一从肝硬化死亡引起。Apoptosis广泛地被认为从坏死的房间死亡是房间死亡和一个不同实体的一个活跃精力依赖者模式。胃的mucosalapoptosis是否涉及PHTgastropathy，是不清楚的。通过cyclooxygenase(艇长)生产的前列腺素(PG)被认为从损害和apoptosis在胃肠的mucosa的保护起一个关键作用。然而，在PHTgastropathy的艇长的角色仍然不清楚地被理解。这研究的目的是调查(1)胃的mucosalapoptosis是否涉及PHTgastropathy，(2)艇长的downregulation贡献这apoptosis。在这研究，当mucosal增长在PHT老鼠被禁止时，我们证明胃的mucosalapoptosis显著地被增加。胃的mucosalCOX-1显著地在mRNA和蛋白质层次被压制，并且PGE2在PHT老鼠被减少。进一步，PGE2处理在PHT老鼠压制了胃的mucosalapoptosis。然而，胃的mucosalCOX-2层次没在假冒操作老鼠和PHT老鼠之间不同。肿瘤坏死因素的胃的mucosal层次--(TNF-)并且船边交货ligand，然而并非TNF相关的导致apoptosisligand，被增加，并且激活的caspase-8和caspase-3层次是在PHT老鼠的upregulated。到cytosol的从线粒体的细胞色素c的版本没在PHT老鼠被观察。我们的数据显示COX-1的downregulation经由死亡涉及胃的mucosalapoptosis调停信号的类型--我在PHT老鼠的房间死亡。

简介：WereportedinthismanuscriptthatTGF-β1inducesapoptosisinAML12murinehepatocytes,whichisassociatedwiththeactivationofp38MAPKsignalingpathway.SB202190,aspecificinhibitorofp38MAPK,stronglyinhibitedtheTGF-β1-inducedapoptosisandPAI-1promoteractivity.TreatmentofcellswithTGF-β1activatesp38.Furthermore,over-expressionofdominantnegativemutantp38alsoreducedtheTGF-β1-inducedapoptosis.Thedataindicatethattheactivationofp38isinvolvedinTGF-β1-mediatedgeneexpressionandapoptosis.

简介：Peroxisome激活proliferator的受体鲸鱼群妈(PPARγ)coactivator-1高山哈(PGC-1α)coactivates多重抄写因素并且调整几个代谢过程。Thecurrent学习在人的上皮的卵巢的癌症房间在apoptosis的正式就职调查了PGC-1α的角色。在人的卵巢和人的卵巢的上皮的肿瘤之间的PGC-1α信使rna水平被量的RT-PCR检验。更少的PGC-1α表示与正常卵巢相比在恶意的肿瘤的表面上皮被发现。在人的上皮的卵巢的癌症房间线Ho-8910的PGC-1α的Overexpression通过Bcl-2和Bax表示的协调规定导致了房间apoptosis。Microarray分析证实PGC-1α戏剧性地在Ho-8910房间影响了apoptosis相关的基因。Mitochondrial功能的试金证明apoptosis的正式就职通过由细胞色素c.Furthermore的版本的终端阶段，导致的apoptosis部分是，然而并非完全，由PPARγantagonist(GW9662)堵住了的PGC-1α-，并且由siRNA的PPARγ表示的抑制也在Ho-8910房间禁止了PGC-1α-inducedapoptosis。这些数据建议PGC-1α通过aPPARγ-依赖者小径施加了它的效果。我们的调查结果显示PGC-1α涉及apoptoticsignaltransduction小径，PGC-1α的down规定可以是在支持上皮的卵巢的癌症生长和前进的一个关键点。

简介：

简介：Twomajorapoptosispathwayshavebeendefinedinmammaliancells,theFas/TNF-R1deathreceptorpathwayandthemitochondriapathway.TheBcl-2familyproteinsconsistofbothanti-apoptosisandpro-apoptosismembersthatregulateapoptosis,mainlybycontrollingthereleaseofcytochromecandothermitochondrialapoptoticevents.However,deathsignalsmediatedbyFas/TNF-R1receptorscanusuallyactivatecaspasesdirectly,bypassingtheneedformitochondriaandescapingtheregulationbyBcl-2familyproteins.Bidisanovelpro-apoptosisBcl-2familyproteinthatisactivatedbycaspase8inresponsetoFas/TNF-R1deathreceptorsignals.ActivatedBidistranslocatedtomitochondriaandinducescytochromecrelease,whichinturnactivatesdownstreamcaspases.Suchaconnectionbetweenthetwoapoptosispathwayscouldbeimportantforinductionofapoptosisincertaintypesofcellsandresponsibleforthepathogenesisofanumberofhumandiseases.

简介：小道，肿瘤坏死因素相关的导致apoptosisligand，是一个新奇有势力通过房间表面死亡受体Trail-R1和Trail-R2的激活的房间死亡小径的内长的使活跃之物。它的角色象在导致激活的房间死亡(AICD)的FasL一样，在免疫系统被表明了。然而，小道的机制导致了apoptosis遗体不清楚。在这份报告，重组体小道蛋白质被表示并且净化。导致apoptosis活动和JurkatT房间上的重组体小道的规定机制是探索试管内。Trypan蓝排除试金证明重组体小道蛋白质活跃地以一种剂量依赖者方式杀死了JurkatT房间。在JurkatT房间的导致小道的apoptosis被Bcl-2显著地在Bcl-2基因transfected房间在表示上减少。有PMA(phorbol12十四酸盐13醋酸盐)的处理，PKC使活跃之物，在JurkatT房间的压制的导致小道的apoptosis。由PMA的apoptosis的抑制被预告的处理与二度废除，一个PKC禁止者。总起来说，Bcl-2在表示上和PMA激活PKC，这被建议活跃地下面调整在JurkatT的调停小道的apoptosis房间。

简介：<正>Uponactivation,naiveT-helpercellscandifferentiateintotwomajordistinctsubsets,Thelper1(Th1)andThelper2(Th2),asdefinedbytheireffectorfunctionsandcytokinesecretionpatterns.CytokinemilieuandcostimulatorymoleculeshavebeenshowntoplayanessentialroleindeterminingThelperdifferentiation.However,itisstillunclearhowtheeffectsofsignalsofco-stimulatorymoleculesandcytokinesareexertedduringThelperdifferentiation.Weshowevidencesuggestingthatwhilecytokinesignalsinitiatedifferentiationprogram,theselectiveactionofdeatheffectorsdeterminestheendpointbalanceofdifferenti-

简介：<正>WeandothershavefirmlyestablishedthatsurfaceIgMreceptor(sIgM-R)crosslinkingwithantibodiestotheiheavychain(anti-i)leadstogrowtharrestandapoptosisinaseriesofwellcharacterizedB-celllymphomas.Thisrequiresablationofc-Mycproteinexpressionandtheconcomitantinductionofthecyclin-dependent-kinaseinhibitor,p27Kip1.Thesignalingmechanismsregulatingc-Mycandp27Kip1proteinexpressionarepoorlyunderstood.However,werecentlyestablishedthatsIgM-Rmediateddown-modulationofthePI-3Kpathwaydirectlyaffectedc-Mycandp27Kip1expressionandaccuratelypredictedgrowtharrest

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