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1、[基金项目]国家自然科学基金面上项目(30872363)[通信作者]何於娟,电话:(023)68485859,E-mail:yjhemail@126.com肺炎链球菌溶血素诱导THP-1细胞凋亡涉及MAPK1/3信号途径姜慧,贺潇,袁军,王虹,李忱炜,董杰,崔瑾,董姗姗,周爱娥,张雪梅,胥文春,尹一兵,何於娟(400016重庆,重庆医科大学检验系临床检验诊断学教育部重点实验室)[摘要]目的探讨肺炎链球菌溶血素(pneumolysin,Ply)对人急性单核细胞白血病单核细胞株THP-1细胞的增殖抑制和诱导凋亡作用及机制。方法MTT法检测Ply对THP-1细胞的增殖抑制
2、。瑞氏染色观察Ply对人THP-1细胞形态的影响。AnnexinV-FITC/PI双标法检测细胞凋亡。琼脂糖凝胶电泳观察凋亡细胞DNA片段化现象。免疫组化和Westernblot检测MAPK1/3蛋白表达的变化。结果将人THP-1细胞分别与0.05、0.1、0.5、1、2.5、5μg/mlPly共同孵育后,在24、48、72、96h用MTT法检测细胞增殖抑制率,发现Ply对人THP-1细胞具有明显的增殖抑制作用,并且呈剂量和时间依赖性,IC50(24h)为1.31μg/ml;0.05μg/ml和0.1μg/mlPly分别处理THP-1细胞12h后,通过瑞氏染色法观察
3、人THP-1细胞可见凋亡小体及核碎裂象等典型的凋亡形态学改变;用0.05μg/mlPly和0.1μg/mlPly作用THP-1细胞12h后细胞早期凋亡率分别为11.83%和48.45%(P<0.05);提取凋亡THP-1细胞DNA,进行琼脂糖凝胶电泳可见典型的“梯状”条带;Ply作用于人THP-1细胞后,胞内MAPK1/3蛋白表达降低(P<0.05)。结论Ply可诱导人THP-1细胞凋亡,此作用涉及MAPK1/3信号通路的参与。[关键词]肺炎链球菌溶血素;THP-1细胞;凋亡;MAPK1/3通路[中图法分类号][文献标志码]APneumolysininducedap
4、optosisinhumanTHP-1cellsinvolvedMAPK1/3signalpathwayJiangHui,HeXiao,YuanJun,WangHong,LiChenwei,DongJie,CuiJin,DongShanshan,ZhouAi’e,ZhangXuemei,XuWenchun,YinYibing,HeYujuan(KeyLaboratoryofClinicalLaboratoryDiagnostics,MinistryofEducation,ChongqingMedicalUniversity,Chongqing,400016,Chin
5、a)[Abstract]ObjectiveTostudythemechanismofproliferationinhibitionandapoptosisofhumanacutemonocyticleukemiaTHP-1cellsinducedbypneumolysin(Ply).MethodsThegrowthinhibitionrateofTHP-1cellswasmeasuredbyMTTassay.MorphologyofTHP-1cellswasdetectedbyWright’sstaining.TheapoptosisrateofTHP-1cells
6、wasexaminedbyAnnexinV-FITC/PI-stain.DNAfragmentationwasexaminedbysepharoseelectrophoresis.TheexpressionofMAPK1/3wasinvestigatedbyimmunocytochemistryandWestern-blot.ResultsTHP-1cellswerecoculturedwithPlyattheterminalconcentrationof0.05,0.1,0.5,1,2.5,5μg/ml,thegrowthinhibitionratewasmeas
7、uredbyMTTassayat24,48,72,96haftercoculture,PlypresentedtheapparentproliferationinhibitiononTHP-1cellsinatime-anddose-dependentmanner,withIC50(24h)being1.31μg/ml;Thetypicalmorphologicalfeaturesofapoptosis,suchasnuclearfragmentationandapoptosisbody,wereobservedinTHP-1cellsafterPlytreat