简介:WereportedinthismanuscriptthatTGF-β1inducesapoptosisinAML12murinehepatocytes,whichisassociatedwiththeactivationofp38MAPKsignalingpathway.SB202190,aspecificinhibitorofp38MAPK,stronglyinhibitedtheTGF-β1-inducedapoptosisandPAI-1promoteractivity.TreatmentofcellswithTGF-β1activatesp38.Furthermore,over-expressionofdominantnegativemutantp38alsoreducedtheTGF-β1-inducedapoptosis.Thedataindicatethattheactivationofp38isinvolvedinTGF-β1-mediatedgeneexpressionandapoptosis.
简介:目的探讨热休克蛋白(HSP70)在人胶质瘤细胞BT-325p38MAPK信号通路中的作用.方法用脂质体介导法将hsp70基因导入人胶质瘤细胞BT-325中,倒置显微镜观察转染细胞的形态学及粘附性变化,紫外线照射30min后,采用免疫组化和Western-blot方法测定转染前后HSP70的表达水平及照射前后p38MAPK表达情况.结果免疫组化和Western-blot证实hsp70基因成功转染入BT-325中,转染细胞受到紫外线照射后p38MAPK表达减弱.结论体外转染hsp70基因可抑制紫外线照射后BT-325细胞p38MAPK的表达.
简介:摘要急性肺损伤(ALI)/急性呼吸窘迫综合征(ARDS)是由弥漫性肺间质及肺泡水肿导致的急性呼吸功能不全。高迁移率族蛋白B1(HMGB1)作为ALI/ARDS炎症进展中重要的晚期炎性因子,可与其细胞表面受体Toll样受体4(TLR4)、晚期糖基化终产物受体(RAGE)等结合,激活下游通路,进而诱导转录多种炎性因子。HMGB1-TLR4/RAGE信号通路复杂,在ALI/ARDS进程中的作用机制尚不明确。本文就HMGB1-TLR4/RAGE信号通路在ALI/ARDS中的研究进展进行综述,以期发现ALI/ARDS的治疗新靶点。
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.