简介:Objective:Tostudythevaccinepotencyofgene-modifiedtumorcells.Methods:TheEL-4lymphomawastransducedwithrecombinantretroviruscontainingthemurineGM-CSFgeneorB7-1gene.Theeffectofgenetransductiononantitumorimmunitywasinvestigated.Results:Flowcytometryanalysisshowedthatexpressionoftheirsurfacemarkerbetweenwild-typeEL-4cellsandgenetransducedtumorcellswasthesameexceptforCD80positiveinB7-1genetransducedcells.GM-CSFgeneorB7-1genetransducedEL-4cellsresultedinremarkablelossoftumorigenicityinsyngeneticmice.ThesystemicprotectiveimmunitywasinducedagainstthechallengewithEL-4/wtcells.TherapeuticvaccinewithEL-4/GM-CSForEL/7-1cellscouldretardthegrowthofestablishedearly-stageEL-4/wttumorsignificantly,butnotretardthegrowthoflate-stageEL-4/wttumor.IrradiatedGM-CSFgenetransducedEL-4cellsshowedstrongvaccineeffectagainstEL-4cellchallenge,butirradiatedB7-1genetransducedEL-4cellsshowedweakvaccineeffect.RemarkablecooperativeantitumoreffectagainstEL-4cellchallengewasobservedwhenbothirradiatedEL-4/GM-CSFandEL-4/B7-1wereinoculatedtogether.Conclusion:GM-CSFgeneorB7-1genetransducedcombinationofthetwokindsofvaccinemayhavepotentialapplicationvalueinhumancancertreatment.
简介:目的探索bcl-2-9GM-CSF的长链dsRNA(LongerdoublestrandRNA,LdsRNA)对肿瘤细胞生长的抑制作用。方法使用体外转录法制备地高辛标记的bcl一2和GM—CSF基因的LdsRNA,转染THP1、HL-60和K562髓系白血病细胞系,分别以MTT法、免疫组化、免疫荧光技术和紫外分光光度计检测细胞LdsRNA转染水平,细胞增殖,特异性bcl-2蛋白表达和细胞总蛋白含量。结果LdsRNA能显著抑制THP1细胞增殖(P<0.05)和蛋白质合成,对HL-60和K562细胞系也有一定的抑制作用。结论LdsRNA能抑制肿瘤细胞的增殖,为以后利用LdsRNA用于肿瘤的治疗奠定一定的理论基础。
简介:胃癌是导致癌症患者死亡的主要疾病之一,而现有的治疗手段有限。当前免疫检测点抑制剂在肿瘤的治疗中取得了突破进展,相关研究迅速覆盖到胃癌。针对免疫检查点抗程序性死亡分子1(PD-1)/PD-1配体(PD-L1)抗体的临床研究正在广泛开展。本文对胃癌发生的免疫机制,PD-1/PD-L1表达,抗PD-1/PD-L1抗体早期临床研究及抗PD-1/PD-L1抗体预测疗效的生物标志物的研究进行文献复习。
简介:Objective:Toinvestigatethepost-transcriptionalregulationofp21WAF1/CIP1byp53.Methods:TheMDA-MB-468cellshaveendogenousmutantp53andtheMCF7cellslineshavewtp53.Recombinantp53expressionandp21WAF1/CIP1inductionweredetectedbyWesternblotanalysis.Northernblotanalysiswascarriedouttoexaminewhetherchangesinp21WAF1/CIP1proteinlevelsinMCF7cellstreatedwithAdCMVp53arereflectedatthemRNAlevel.FlowcytometricanalysisofMCF7cellsfollowingoverexpressionofrecombination.Results:Theratioofp53:p21WAF1/CIP1wasbelow1attheearlystagesofAdCMVp53infection,butincreasedto1.6byday3andto9.7byday5post-infection.Asexpected,p21WAF1/CIP1expressionwasnotdetectableinMDA-MB-468cellsdespitethepresenceofhighlevelsofmutantp53protein.TheG1/SratiosinuntreatedcontrolsandAdCMVβgalinfectedMCF7cellswere1.10and1.35,respectively.ByNorthernblotanalyzingthep21WAF1/CIP1:GAPDHratiosatdifferenttimepointsagainsttheratioattimepoint0,amaximum3-foldinductionofp21WAF1/CIP1mRNAexpressionrelativetountreatedcontrolwasobservedonday1post-infection.TheflowcytometricanalysisindicatedthatMCF7cellsinfectedwithAdCMVp53undergoG1arrestatbothtimepointsstudied,withG1/Sratiosrangingfrom5.54atday1to5.65atday7.TheG1/SratiosinuntreatedcontrolsandAdCMVβgalinfectedMCF7cellswere1.10and1.35,respectively.Conclusion:Thisstudydemonstratedthatp53couldregulatep21WAF1/CIP1geneexpressionatboththetranscriptionalandpost-transcriptionallevelsinMCF7cells.Thelattermechanismmaybeinvolvedinorberesponsiblefor,theinductionofcellcyclearrestbytranscription-defectivemutantsofp53.
简介:妊娠合并脑瘤后,由于早孕反应和晚期妊娠中毒,出现头痛、恶心、呕吐等症状,易与脑瘤所致之颅内压增高的症状相混淆,延误诊治。一28岁女性患者,因停经8月,头痛、恶心、呕吐,右上、下肢无力半月,于2003年6月7日入我院。检查:神志清楚,右侧上、下肢肌力Ⅲ级,肌张力增高,右侧Babinski征阳性。腹围91cm,宫高31cm,头先露,浮,胎心144次/分。MRI检查:左额叶4×3.5×5cm分叶状占位病变。T1等、低、混杂信号,T2高、等、混杂信号。周围脑白质水肿,灰质受压,左侧脑室变窄,中线结构右移。诊断:右额叶胶质瘤,妊娠8月。2003年6月17日手术,先在腰麻下行剖腹产,娩出2250克重男婴,成活良好。随即