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31 个结果
  • 简介:Ionizingradiationisoneofthemosteffectivetoolsincancertherapy.Inapreviousstudy,wereportedthatproteintyrosinekinase(PTK)inhibitorsmodulatetheradiationresponsesinthehumanchronicmyelogenousleukemia(CML)celllineK562.Thereceptortyrosinekinaseinhibitor,genistein,delayedradiation-inducedcelldeath,whilenon-receptertyrosinekinaseinhibitor,herbimycinA(HMA)enhancesradiation-inducedapoptosis.Inthisstudy,wefocusedonthemodulationofradiation-inducedcelldeathbygenisteinandperformedPCR-selectsuppressionsubtractivehybridization(SSH)tounderstanditsmolecularmechanism.Weidentifiedhumanthymidinekinase1(TK1),whichiscellcycleregulatorygeneandconfirmedexpressionofTK1mRNAbyNorthernblotanalysis.ExpressionofTK1mRNAandTK1enzymaticactivitywereparallelintheirincreaseanddecrease.TK1isinvolvedinG1-Sphasetransitionofcellcycleprogression.Incellcycleanalysis,weshowedthatradiationinducedG2arrestinK562cellsbutitwasnotabletosustain.However,theadditionofgenisteintoirradiatedcellssustainedaprolongedG2arrestupto120h.Inaddition,theexpressionofcellcycle-relatedproteins,cyclinAandcyclinB1,providedtheevidencesofG1/SprogressionandG2-arrest,andtheirrelationshipwithTK1incellstreatedwithradiationandgenistein.TheseresultssuggestthattheactivationofTK1maybecriticaltomodulatetheradiation-inducedcelldeathandcellcycleprogressioninirradiatedK562cells.

  • 标签: 染料木素 胸腺嘧啶核苷激酶1 活化 辐射 细胞凋亡 K562
  • 简介:与一级的CD8约会主要组织亲和性抗原极大地提高T房间激活,但是这怎么被完成,不是清楚的。我们探讨CD8的调停抗体的结扎是否独自导致在T房间克隆改变的transcriptional的问题,用基因表示的连续分析。尽管它没能导致公开phenotypic变化,我们发现CD8结扎深刻地在T房间克隆改变抄写,在比得上由CD3的调停抗体的结扎导致了那的规模。然而,产生变化的特性与是实质地禁止的CD8结扎的网效果是不同的。我们推测那绑扎的CD8导致弱,T房间受体(TCR)调停了TCR对手的效果暗示的禁止的信号。我们的结果暗示CD8结扎独自不能因为它没能充分导致NFAT依赖的抄写,激活T房间克隆。

  • 标签: 受体触发 信令 基因表达 微分重建
  • 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。

  • 标签: TRAIL T细胞 PMA PKC BIS 细胞凋亡
  • 简介:它一致地被看了那oncoproteinp28GANK,它是在人的hepatocellular癌(HCC)的overexpressed,在HCC的tumorigenesis起一个关键作用。然而,内在的机制仍然保持不清楚。这里,我们证明p28GANK在endoplasmic蜂窝胃导致的HCC房间禁止apoptosis(嗯)应力。在期间嗯应力,p28GANK提高展开的蛋白质反应,支持嗯从翻译压抑的恢复,并且从而便于房间的能力应付压力条件。而且,p28GANKupregulates调整葡萄糖的蛋白质78(GRP78),一把钥匙嗯女伴蛋白质,它随后提高合拢能力的ER并且支持恢复从嗯应力。我们也证明p28GANK增加p38激活mitogen的蛋白质kinase和Aktphosphorylation,并且禁止原子因素kappaB(NF-B)激活在下面嗯强调upregulation,它接着贡献GRP78。一起拿,我们的结果显示p28GANK禁止嗯在HCC房间的导致压力的apoptosis,至少部分地,由提高适应反应和GRP78表示。我们建议p28GANK在ER压力条件下面为HCC前进有潜在的含意。

  • 标签: 内质网应激 适应能力 肝细胞癌 诱导 P38丝裂原活化蛋白激酶 核因子KAPPA
  • 简介:在生长因素刺激之上,支架蛋白质,Gab1,是酷氨酸phosphorylated并且随后适配器蛋白质,Crk,从Gab1播送信号。我们以前证明了没有细胞外的刺激,Crkoverexpression,在各种各样的人的癌症可检测,导致Gab1的酷氨酸phosphorylation。在现在的学习,内在的机制进一步被调查。CrkII的Mutational分析证明SH2领域,然而并非SH3(N)或CrkII的规章的Y221残余,为Gab1-Y307phosphorylation的正式就职是批评的。CrkII的SH2变化也减少了和Gab1的相互作用。在GST下拉试金,而Crk-SH3(N)与Gab1异种交往了,Crk-SH2跳了到野类型的Gab1,它缺乏聚类的酷氨酸区域(残余242-410)。Gab1的酷氨酸phosphorylation被表明适配器的所有Crk家庭蛋白质,然而并非另外的包含SH2导致。Src家庭kinase禁止者,PP2,废除Gab1的导致Crk的酷氨酸phosphorylations。Y307phosphorylation在缺乏Src,是,和Fyn的成纤维细胞是无法发现的,甚至在Crk的overexpression之上,而缺乏仅仅是和Fyn的房间仍然与phosphorylatedY307包含了Gab1。而且,Crk导致了Src-Y416的phosphorylation;因此,在Crk和Csk之间的相互作用被增加。Gab1-Y307F异种没能近甚至在HGF之上本地化血浆膜刺激和减少的房间移植。而且,Gab1-Y307F扰乱了Crk,FAK,和paxillin的本地化,它是焦点的粘附的典型部件。一起拿,这些结果显示Crk通过Src便于Gab1-Y307的酷氨酸phosphorylation,贡献焦点的粘附和提高的房间移植的组织,可能从而支持人的癌症开发。

  • 标签: 酪氨酸磷酸化 细胞迁移 C蛋白 SRC 诱导 粘连
  • 简介:cAMPmediatedsignalingmayplayasuppressiveroleinimmuneresponse.WepreviouslyfoundthatthecAMP-elevators(CTxand8-Br-cAMP)inhibitedIL-12,IL-la,IL-6geneexpression,butincreasedthetranscriptionallevelsofIL-10andIL-1RainLPS-treatedmurineperitonealmacrophages.ThepresentstudyexaminedapossiblemolecularmechanisminvolvedincAMPelevators-inducedinhibitionofIL-12p40expressioninresponsetoLPS.OurdatademonstratedthatcAMPelevatorsdownregulatedIL-12p40mRNAexpressionandIL-12pT0productioninmurineperitonealmacrophages.SubsequentstudiesrevealedthatcAMP-elevatorsblockedphosphorylationofp38MAPK,butdidnotaffecttheactivityofNF-κBbindingtoIL-12promoter(-136/-112).ThisisthefirstreportthatcAMPelevatorsinhibitLPS-inducedIL-12productionbyamechanismthatisassociated,atleastinpart,withp38-dependentinhibitionbycAMPsignalingpathways.

  • 标签: 巨噬细胞 腹膜 鼠科动物 蛋白磷酸化 CAMP
  • 简介:细胞内部的氧化还原作用动态平衡在决定肿瘤房间的敏感到导致药的apoptosis起一个关键作用。这里,我们调查了thioredoxin-1(TRX1)的角色,氧化还原作用规定的一个关键部件,在砷三氧化物(作为(2)O(3))导致的apoptosis。在HepG(2)房间的野类型的TRX1的在表示上导致了抑制当(2)O(3)导致了细胞色素c(cytoc),释放,caspase激活和apoptosis,并且由RNAi的TRX1表示的绒毛规定敏化HepG(2)房间到当(2)O(3)导致了apoptosis。有趣地,到重量的单位(32/35)的从Cys(32/35)的TRX1的活跃地点的变化从一个apoptotic保护者把这个分子变换成一个apoptotic倡导者。以理解这变换的机制,我们从老鼠肝使用了孤立的线粒体并且发现了野类型的TRX1能保护的那重组体从apoptotic的线粒体变化。相反,TRX1的变异的形式独自得到了线粒体相关的apoptotic变化,包括mitochondrial渗透转变毛孔(mPTP)洞,mitochondrial膜潜力的损失,和cyto从线粒体的c版本。这些apoptotic效果被cyclosporineA(CsA)禁止,显示指向到mPTP的那变异的TRX1。到由2,4-dinitrochlorobenzene(DNCB)的氧化形式体内的从它的减少的形式的TRX1的改变,TRXreductase的一个特定的禁止者,也敏化的HepG(2)房间到当(2)O(3)导致了apoptosis。这些数据建议TRX1由任何一个变化在由堵住cytoc版本调整apoptosis,并且在TRX1的激活起一个中央作用或活跃地点半胱氨酸的氧化可以敏化肿瘤房间到当(2)O(3)导致了apoptosis。

  • 标签: 肝癌 三氧化砷 线粒体 细胞色素 细胞凋亡
  • 简介:Amurinemacrophage-likecelllineJ774,acquired,inresponsetoLPS,anabilitytokilltumornecrosisfactor(TNF)-insensitivetargetP815mastocytomacellswhereasanothercellline,P388D1didnot,LPStriggeredsignalingmechanismsbetweenthetwocelllineswerecomparedwithanaimtoinquireaboutthepossiblenatureoftheabove-mentioneddifference,TheresultswhowedthattwocelllinesrespondtoLPS-treatmentbyparallelactivationofbothphospholipasesCandA2(PLCandPLA2)toapproximatelythesameextent.ThemaximumresponseoftothenzymesofJ774cellswasnotedwithin10minthetreatmentwhereasthatofP388D1cellsrequiredmorethan20min,TheotherpropertiesofLPS-responsiveenzymesstudiedweresimilarbetweentwocelllines,includingActivationofPLCandPLA2andPKCinmacrophagesbyLPS.Ca2+augmentationofenzymeactivation,participationofguaninenucleotidebinding(G)proteinsintheinitialactivationpreocesses,andinhibitionofenzymeactivationbythepriortreatmentofcellswithcholeraorpertussistoxinsetc.Moreover,LPS-triggeredactivationofPLCandPLA2wasfoundtobefollowedbytheincreaseofPKCactivitiesinbothcelllines.Inspiteofthesesimilarities.J774cellspossessedbothbasicandacidicformsofPKCactivities,whileP388D1cellsownedonlyPKCofbasicform,Nevertheless,thequestionwhyJ774cellsbutnotP388D1cells,canacquirethetumoricidalactivity,aganistP815,cellsfollowingLPStreatmentrematinstobeanswered.

  • 标签: 鼠巨噬细胞细胞系 磷脂酶A2 磷脂酶C 蛋白激酶C LPS诱导激活
  • 简介:Amurinemacrophage-likecellline,J774,acquried,inresponsetoLPS,anabilitytokilltumornecrosisfactor(TNF)-insensitivetargetP815mastocytomacells,whereasanothercellline,P388D1,didnot.LPS-triggeredsignalingmechanismsbetweenthetwocelllineswerecomparedwithanaimtoinquireaboutthepossiblenatureoftheabove-mentioneddifference.TheresultsshowedthattwocelllinesrespondtoLPS-treatmentbyparallelactivationofbothphospholipasesCandA2(PLCandPLA2)toapproximatelythesameextent.ThemaximumresponseofbothenzymesofJ774cellswasnotedwithin10minofthetreatment,whereasthatofP388D1cellsrequiredmorethan20min.TheotherpropertiesofLPS-responsiveenzymesstudiedweresimilarbetweentwocelllines,ineludingActivationofPLCandPLA2andPKCinmacrophagesbyLPSCa2+augmentationofenzymeactivation,participationofguaninenucleotidebinding(G)proteinsintheinitialactivationprocesses,andinhibitionofenzymeactivationbythepriortreatmentofcellswithcholeraorpartussistoxinsetc.Moreover,LPS-triggeredactivationofPLCandPLA2wasfoundtobefollowedbytheincreaseofPKCactivitiesinbothcelllines.Inspiteofthesesimilarities,J774cellspossessedbothbasicandacidicformsofPKCactivities,whileP388D1cellsownedonlyPKCofbasicform.Nevertheless,thequestionwhyJ774cells,butnotP388D1cells,canacquirethetumoricidalactiyity,aganistP815cellsfollowingLPS-treatmentremainstobeanswered.

  • 标签: MURINE macrophagss LPS-induced activation PLO PLA2