学科分类
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175 个结果
  • 简介:Objective:ActivatingKRASmutationsarethemostcommondriversinthedevelopmentofnon-smallcelllungcancer(NSCLC).However,unsuccessoftreatmentbydirectinhibitionofKRAShasbeenproven.DeregulationofPI3KsignalingplaysanimportantroleintumorigenesisanddrugresistanceinNSCLC.TheactivityofPI3Kα-selectiveinhibitionagainstKRAS-mutatedNSCLCremainslargelyunknown.Methods:CellproliferationwasdetectedbysulforhodamineBassay.Cellcycledistributionandapoptosisweremeasuredbyflowcytometry.CellsignalingwasassessedbyWesternblotandimmunohistochemistry.RNAinterferencewasusedtodown-regulatetheexpressionofcyclinD1.HumanNSCLCxenograftswereemployedtodetecttherapeuticefficacyinvivo.Results:CYH33possessedvariableactivityagainstapanelofKRAS-mutatedNSCLCcelllines.AlthoughCYH33blockedAKTphosphorylationinalltestedcells,RbphosphorylationdecreasedinCYH33-sensitive,butnotinCYH33-resistantcells,whichwasconsistentwithG1phasearrestinsensitivecells.CombinedtreatmentwiththeCDK4/6inhibitor,PD0332991,andCYH33displayedsynergisticactivityagainsttheproliferationofbothCYH33-sensitiveandCYH33-resistantcells,whichwasaccompaniedbyenhancedG1-phasearrest.Moreover,down-regulationofcyclinD1sensitizedNSCLCcellstoCYH33.Reciprocally,CYH33abrogatedthePD0332991-inducedup-regulationofcyclinD1andphosphorylationofAKTinA549cells.Co-treatmentwiththesetwodrugsdemonstratedsynergisticactivityagainstA549andH23xenografts,withenhancedinhibitionofRbphosphorylation.Conclusions:SimultaneousinhibitionofPI3KαandCDK4/6displayedsynergisticactivityagainstKRAS-mutatedNSCLC.ThesedataprovideamechanisticrationaleforthecombinationofaPI3KαinhibitorandaCDK4/6inhibitorforthetreatmentofKRASmutatedNSCLC.

  • 标签: PI3Ka CDK4/6 KRAS NSCLC CYH33
  • 简介:Activationofthephosphoinositide3kinase(PI3K)/Akt/mammaliantargetofrapamycin(mTOR)pathwayiscommoninbreastcancer.Thereispreclinicaldatatosupportinhibitionofthepathway,andphaseⅠtoⅢtrialsinvolvinginhibitorsofthepathwayhavebeenorarebeingconductedinsolidtumorsandbreastcancer.Everolimus,anmTORinhibitor,iscurrentlyapprovedforthetreatmentofhormonereceptor(HR)-positive,humanepidermalgrowthfactorreceptor2(HER2)-negativebreastcancer.Inthisreview,wesummarisetheefficacyandtoxicityfindingsfromtherandomisedclinicaltrials,withsimplifiedguidelinesonthemanagementofpotentialadverseeffects.Educationofhealthcareprofessionalsandpatientsiscriticalforsafetyandcompliance.WhilethereissomeclinicalevidenceofactivityofmTORinhibitioninHR-positiveandHER2-positivebreastcancers,thebenefitsmaybemorepronouncedinselectedsubsetsratherthanintheoverallpopulation.FurtherdevelopmentofpredictivebiomarkerswillbeusefulintheselectionofpatientswhowillbenefitfrominhibitionofthePI3K/Akt/mTOR(PAM)pathway.

  • 标签: MTOR 乳腺癌 抑制剂 表皮生长因子受体 临床试验 生物标志物
  • 简介:目的优化建立一种敏感、简便、稳定地检测结肠癌患者K-Ras基因突变的方法。方法构建K-Ras基因第二外显子12、13密码子的野生型及突变型质粒,通过优化PCR及肽核酸与特异性引物的浓度关系,达到有效模板浓度低的样品K-Ras基因突变的检测。结果成功构建K-Ras基因第二外显子12、13密码子的野生型和突变型质粒。肽核酸钳制PCR条件优化包括:(1)最佳复性温度为58℃和60℃;(2)有效模板浓度为10^-6pg/μl;(3)引物浓度与肽核酸浓度的最佳比例为20∶1。在K-Ras突变型质粒与野生型质粒浓度比为1∶100时即可检测到突变。结论肽核酸钳制PCR技术较传统的测序方法更为敏感,可以应用于有效模板浓度低的样品,为结肠癌个体化治疗前相关基因检测的有效方法。

  • 标签: 肽核酸 结肠癌 K-RAS基因 西妥昔单抗 个体化治疗
  • 简介:Objective:Avarietyofionchannelshavebeenimplicatedinbreastcancerproliferationandmetastasis.VoltagegatedK+(Kv)channelsnotonlycauserepolarizationinexcitablecells,butarealsoinvolvedinmultiplecellularfunctionsinnon-excitablecells.InthisstudyweinvestigatedtheroleofKvchannelsinmigrationofBT474breastcancercells.Methods:Transwelltechniquewasusedtoseparatemigratorycellsfromnon-migratoryonesandthesetwogroupsofcellsweresubjecttoelectrophysiologicalexaminationsandmicrofluorimetricmeasurementsforcytosolicCa2+.CellmigrationwasexaminedintheabsenceorpresenceofKvchannelblockers.Results:Whencomparedwithnon-migratorycells,migratorycellshadmuchhigherKvcurrentdensities,butratherunexpectedly,moredepolarizedmembranepotentialandreducedCa2+influx.Reversetranscriptasepolymerasechainreaction(RT-PCR)analysisrevealedthepresenceofKv1.1,Kv1.3,Kv1.5,Kv2.1,Kv3.3,Kv3.4andKv4.3channels.Cellmigrationwasmarkedlyinhibitedbytetraethylammonium(TEA),adelayedrectifierKvchannelblocker,butnotby4-aminopyridine,anA-typeKvchannelblocker.Conclusions:Takentogether,ourresultsshowthatincreasedKvchannelexpressionplayedaroleinBT474cellmigration,andKvchannelscouldbeconsideredasbiomarkersorpotentialtherapeutictargetsforbreastcancermetastasis.Themechanism(s)bywhichKvchannelsenhancedmigrationappearedunrelatedtomembranehyperpolarizationandCa2+influx.

  • 标签: BREAST cancer Kv CHANNELS migration biomarkers
  • 简介:Objective:Tounderstandwhetherverapamil(VER)resistancedevelopmentinthemultidrug-resistantcelllineanditsmechanism.Methods:K562/ADM/VERcellsublineresistanttoverapamilwasestablishedthroughagradualincreaseofVERconcentrationinthemedia.MTTmethodwasusedtoassayresistancetoVER,crossresistancetodipyriamole(DPM),cyclosporinA(CsA)inthecells,andHPLCandspectrofluorometertodetectintracellularaccumulationofVERorADMrespectively,aswellasS-Pimmunocytochemicaltechniquefordetectionofgenesexpression.Results:Itwereobservedthat7.9-foldincreaseinVERresistance,significantlyreducedintracellularaccumulationofVERorADMandalsodevelopacrossresistancetoDPMandCsAinK562/ADM/VERcells,comparedwithitsparentcell,K562/ADM.High-levelofp-glycoprotein(pgp),middle-levelofp53,p16,waspresentintwocelllineswithoutexpressionofGSTPI,C-myc,C-myc,C-fosandC-erbB-2.Bc1-2proteinexpressionwasfoundonlyinK562/ADMcells.Conclusion:K562/ADMcellswerecapableofbeinginducedtodevelopresistancetoVER.

  • 标签: 人的白血病的房间试验性的治疗 Multidrug 抵抗 钙隧道 blocker 基因表示
  • 简介:目的评价髓核摘除联合K-Rod动态固定治疗腰椎间盘突出症的临床疗效及影像学变化。方法2009年1月至2011年11月,对39例单节段或双节段腰椎间盘突出症患者分别采用髓核摘除联合K-Rod动态固定(A组,19例)和经椎间孔椎体间融合(transforaminallumbarinterbodyfusion,TLIF)(B组,20例)治疗。两组患者一般资料比较差异无统计学意义(P>0.05),有可比性。手术前后采用疼痛视觉模拟评分(visualanaloguescale,VAS)及Oswestry功能障碍指数(oswestrydisabilityindex,ODI)进行比较评价,并动态观察术后责任椎间隙高度及腰椎活动度变化情况。结果A组随访时间18~32个月,平均22个月;B组随访时间18~37个月,平均23个月。末次随访两组患者腰腿痛症状明显改善。A组末次随访时VAS为1.16±0.50,ODI为(3.72±3.63)%,较术前VAS5.52±1.58及ODI(50.83±20.28)%有明显降低(P<0.001);B组末次随访时VAS为2.13±0.69,ODI为(18.61±4.07)%,较术前VAS6.50±1.21及ODI(60.56±9.92)%有明显降低(P<0.001)。A组术后手术节段ROM减小,但末次随访时已恢复至术前近60%,B组术后手术节段将为0°。两组相邻节段及腰椎总活动度维持在术前水平。A组末次随访时手术节段椎间隙高度较术前降低约10%,但术后维持在一个较稳定的水平。两组相邻椎间隙高度无明显差异。两组均未见内固定松动、物断裂等情况。结论与融合相比,K-Rod系统保留了腰椎生理曲度和固定节段的活动度,对相邻节段退变无明显影响,短期临床疗效满意,长期疗效有待进一步观察。

  • 标签: 椎间盘退行性变 椎间盘移位 腰椎 脊柱疾病
  • 简介:Objective:TostudythedifferencesandsimilaritiesoftheantisensedrugswithdifferentstructuresonthebiologicalfunctionsofK562cells.Methods:Cytotoxiceffectsweremeasuredbyuseofacellviabilityassay.FlowcytometricanalysisandagarosegelelectrophoresisofDNAfragmentationwerealsoperformed.Theexpressionlevelofproteinwasassayedbyimmunofluorescenceusingfluoresceisothiocyanatelabel.Results:PNAtargetingthecodingregionoftheBcl-2messengerRNAcouldeffectivelyinhibitK562cellviability,down-regulatethesynthesisoftheBcl-2proteinandincreasecellapoptosis.By72haftertheBcl-2antisensePNAtreatment,K562cellsshowedmorereductioninthelevelofBcl-2proteincomparedwithcellstreatedwiththeantisenseODN.Aftertreatmentwith10μmol/LofBcl-2antisensePNAorantisenseODNfor72h,apoptoticratesofK562cellswere13.15±1.13and11.72±1.12,respectively.Furthermore,therewassignificantdifferenceinthepercentageofapoptoticcellsbetweenantisensePNAgroupandantisenseODNgroup.Conclusion:TheresultssuggestthatantisensePNAtargetingthecodingregionofBcl-2mRNAhasbetterantisenseeffectsthantheantisenseoligonucleotidesoninducingapoptosisofK562cells.

  • 标签: BCL-2 反义基因 不同结构 生物结构 K562细胞 细胞毒素
  • 简介:脑胶质瘤是最常见的颅内原发性肿瘤,因多数呈浸润性生长,治疗效果不佳,寻找有效的治疗手段势在必行。目前研究表明,胶质瘤的恶性进展涉及信号转导通路的异常,这为开辟新的治疗手段提供了新思路。现已初步证实,磷酸磷脂酰肌醇-3-羟基激酶信号转导通路异常与胶质瘤的发生、发展关系最为密切,故本文着重对该通路的相关内容作简要介绍。

  • 标签: 胶质瘤 信号转导通路 磷酸磷脂酰肌醇-3-羟基激酶
  • 简介:目的将在对待matrine的K562房间上调查CGI-100-击倒的K562房间的特征和CGI-100RNA干扰(RNAi)的效果。指向CGI-100基因和与一个不同序列包含一样的核苷酸作文的一双否定控制的三oligonucleotides被设计并且化学上综合了的方法。由在K562房间的shRNA-CGI-100的CGI-100表示的抑制效率用semiquantitativeRT-PCR和点污点杂交被决定。K562房间的生长上的CGI-100RNAi的效果用MTT试金被检验,房间区别被不同途径包括流动cytometry,benzidine染色和电子显微镜测量。在CGI-100-konckdownK562细胞为48h与matrine的0.2mg/ml或hemin的30mol/L被孵化以后,GlycophorinA(GPA)(CD235a)和生长因素independence-1BmRNA(Gfi-1BmRNA)的表示层次被RT-PCR和GPA的蛋白质层次测量,CD14和CD15被流动cytometry检测。结果CGI-100RNAi的真核细胞的表示向量成功地被构造。K562/shRNA-CGI-100房间线在由shRNA-CGI-100的CGI-100基因表示的抑制效率在哪个是54%被建立。CGI-100-knockdown禁止了增长并且在K562房间导致了erythroid区别。与控制K562房间相比,K562/shRNA-CGI-100房间证明减少的吸收度价值由MTT试金,减少的enchromation,增加的heterochromation,G0/G1阶段房间的增加的百分比,S阶段房间的减少的人口,减少的PI(房间的增长索引),和benzidine积极的房间的提高的百分比检测了。而且,到matrine或hemin的K562/shRNA-CGI-100房间的敏感被提高,到matrine的这些房间的敏感对hemin比那高。与控制K562房间相比,在K562/shRNA-CGI-100房间的matrine处理导致了增长,benzidine积极的房间的提高的百分比,GPA和Gfi-1B的显然起来调整的mRNA表达式,和GPA的增加的吝啬的荧光紧张(MFI)的增加的禁止的率。没有CD14表示被检测,没有统计意义被作出对有利的裁决检测CD15。最后,在与hemin对待并�

  • 标签: CGI-100 RNA 干扰 白血病 Erythroid 区别 MATRINE
  • 简介:Objective:ToinvestigatetheeffectsofCAL-101,particularlywhencombinedwithbortezomib(BTZ)onmantlecelllymphoma(MCL)cells,andtoexploreitsrelativemechanisms.Methods:MTTassaywasappliedtodetecttheinhibitoryeffectsofdifferentconcentrationsofCAL-101.MCLcellsweredividedintofourgroups:controlgroup,CAL-101group,BTZgroup,andCAL-101/BTZgroup.TheexpressionofPI3K-p110σ,AKT,ERK,p-AKTandp-ERKweredetectedbyWesternblot.TheapoptosisratesofCAL-101group,BTZgroup,andcombinationgroupweredetectedbyflowcytometry.Thelocationchangesofnuclearfactorkappa-B(NF-κB)of4groupswasinvestigatedbyNF-κBKitexploring.Westernblotwasappliedtodetectthelevelsofcaspase-3andthephosphorylationofAKTindifferentgroups.Results:CAL-101dose-andtime-dependentlyinducedreductioninMCLcellviability.CAL-101combinedwithBTZenhancedthereductionincellviabilityandapoptosis.WesternblotanalysisshowedthatCAL-101significantlyblockedthePI3K/AKTandERKsignalingpathwayinMCLcells.ThecombinationtherapycontributedtotheinactivationofNF-κBandAKTinMCLcelllines.However,cleavedcaspase-3wasup-regulatedaftercombinedtreatment.Conclusion:OurstudyshowedthatPI3K/p110σisanoveltherapeutictargetinMCL,andtheunderlyingmechanismcouldbetheblockingofthePI3K/AKTandERKsignalingpathways.ThesefindingsprovidedabasisforclinicalevaluationofCAL-101andarationaleforitsapplicationincombinationtherapy,particularlywithBTZ.

  • 标签: 细胞凋亡 淋巴瘤 抑制剂 CASPASE-3 BLOT分析 CASPASE-3
  • 简介:在染色体9p21的Ink4地点编码P15Ink4b,P14Arf,P16Ink4a,MTAP,ncRNAANRIL/p15AS和p16AS,它在干细胞自强的规定起一个重要作用。这些基因的功能的损失通过绕过在房间周期的G1和S阶段之间的检查点支持房间增长。由在开始地点(TSS)的抄写附近的CpG岛的methylation的Transcriptional沉默是在carcinogenesis的早阶段的一个经常的事件。长期的发炎是为Ink4a基因的CpG岛的methylation的一个强壮的开始者。象Polycomb那样的transcriptionalsilencers的联合有基因特定的ncRNA的组(PcG)蛋白质能epigenetically第一在H3K27,然后在H3K9包括trimethylation导致histone修正。在抄写的长期的沉默的情况中,CpG地点的methylation在目标基因的完整的CpG岛以内日益增多地开始并且传播。就算它的宿主细胞与Ink4a活跃细胞被熔化,Ink4aCpG岛的methylation地位是很稳定的。

  • 标签: METHYLATION INK4 CpG 岛 Ink4 基因
  • 简介:进展期胃癌大体分型由德国病理学家Borrmann[1]于1926年提出,最初版本分为4型,各型描述的形态基本上涵盖了内镜所见和手术切除标本的形态,主要根据肿瘤生长的方向、肿瘤界线是否清楚和是否弥漫性浸润等因素进行分型.Borrmann分型业已运用于上消化道钡餐和内镜检查对病变的描述,远东地区和德国使用最为普遍.该分型与组织学分型有一定相关性,即分化程度较高的乳头状或管状腺癌多为Borrmann1、2型,分化程度较低的腺癌和印戒细胞癌多为Borrmann3、4型,因此,Borrmann分型与胃癌预后也有相关性,当今仍然被广泛采用.

  • 标签:
  • 简介:一、概述趋化因子是一类小分子分泌型(8-14KDa)蛋白,是目前已知的最大的细胞因子家族,已发现超过50种.多数趋化因子氨基端(N端)有4个特征性的保守的半胱氨酸(Cys),相互形成二硫键.

  • 标签: 轴肿瘤
  • 简介:PI3K/Akt信号通路是许多细胞外因子的下游信号传导通路,在细胞生长、增殖、分化和凋亡中起到重要作用,该通路异常广泛存在于许多恶性肿瘤中,与肿瘤发生、发展密切相关。在子宫内膜癌发生发展中,PI3K/Akt信号传导通路异常起到重要的作用,通过对该通路的进一步研究,可能为子宫内膜癌的发生机制、诊断以及为临床靶向治疗提供新的思路。

  • 标签: PI3K/AKT信号通路 PIK3CA AKT PTEN 子宫内膜癌
  • 简介:食管癌相关基因4(esophagealcancerrelatedgene4,ECRG4)是一个在基因表达和蛋白作用方式方面独具特点的抑癌基因。生物信息学分析显示ECRG4的基因结构在不同种属中十分保守,提示其在维持细胞的正常生理功能方面可能发挥着重要作用。本文对ECRG4的生物学背景和其在生理条件及病理条件下的表达情况和功能进行了综述,并对ECRG4在精准医疗中的可能作用进行了讨论,以期为以ECRG4为靶点的诊断和治疗提供可能的线索。

  • 标签: 食管癌相关基因4 抑癌基因 表达和功能 诊断和治疗
  • 简介:黏蛋白是上皮细胞分泌的一类高分子量的糖基化蛋白,是黏液中含量最为丰富的大分子物质,主要表达在人体管腔器官的上皮细胞表面,对细胞有保护及润滑作用[1]。迄今为止共发现黏蛋白家族成员20个,均是高分子量的糖蛋白大分子,按存在形式主要分为三类:分泌型黏蛋白,可溶性黏蛋

  • 标签: MUC4 黏蛋白 肿瘤
  • 简介:为研究肝癌发生过程中RTN4C基因突变,利用直接序列分析、PCR-SSCP等研究了肝癌(HCC)中RTN4C突变与杂合性缺失(LOH).HCC中,RTN4CP突变为62.9%,LOH为68.4%.90%LOH的肝癌中RTN4C发生突变.RTN4C突变相关的肝癌发生中LOH起重要作用.

  • 标签: 肝癌 发生 RTN4C 基因突变 研究