学科分类
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5 个结果
  • 简介:囊包含域蛋白质属于phosphoinositide磷酸酶(PIPPase家庭)一个最新识别的家庭。尽管有描绘得好活动,这个哺乳动物囊领域PIPPase家庭生物功能仍然保持大部分未知。我们识别了新奇囊包含域蛋白质,老鼠Sac3(rSac3)它是广泛地各种各样纸巾表示了并且对endoplasmic蜂窝胃局部,Golgi复杂、再循环内涵体。rSac3vitro作为底层PI(3)P,PI(4)P和PI(3,5)P(2)显示PIPPase活动,并且囊域催化核心一个变化废除它活动。rSac3表示起来刺激神经生长因素(NGF)期间调整了PC12细胞neuronal区别,并且在这表示上,蛋白质PC12细胞支持神经突长出。相反地,由反感觉oligonucleotidesrSac3表示抑制减少刺激NGFPC12神经突长出,并且rSac3活跃地点变化消除它neurite-outgrowth-promoting活动。这些结果显示rSac3通过它PIPPase活动区分神经原支持神经突长出,建议囊领域PIPPase蛋白质可以参予从到血浆膜endoplasmic蜂窝胃和Golgi建筑群前面的膜交通国王,并且可以作为neuronal房间生长和区别的这个关键过程管理者工作。

  • 标签: 细胞内薄膜 神经突 PC12细胞 磷酸肌醇
  • 简介:<正>WeandothershavefirmlyestablishedthatsurfaceIgMreceptor(sIgM-R)crosslinkingwithantibodiestotheiheavychain(anti-i)leadstogrowtharrestandapoptosisinaseriesofwellcharacterizedB-celllymphomas.Thisrequiresablationofc-Mycproteinexpressionandtheconcomitantinductionofthecyclin-dependent-kinaseinhibitor,p27Kip1.Thesignalingmechanismsregulatingc-Mycandp27Kip1proteinexpressionarepoorlyunderstood.However,werecentlyestablishedthatsIgM-Rmediateddown-modulationofthePI-3Kpathwaydirectlyaffectedc-Mycandp27Kip1expressionandaccuratelypredictedgrowtharrest

  • 标签: CH12B细胞淋巴瘤 细胞生长阻滞 细胞凋亡 PI-3K通路 信号转导 IgM受体抗体
  • 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