简介:目的探讨PTEN-PI3K信号转导途径中PTEN与PI3K的蛋白表达与非小细胞肺癌(NSCLC)生物学行为的关系。方法采用第二代免疫组化Elivision法和Westernblot法检测59例NSCLC组织中PTEN与PI3K的蛋白表达。结果通过Westernblot和免疫组化检测PTEN、PI3K的蛋白表达结果一致,在NSCLC组织中阳性表达率分别为55.93%(33/59)、77.97%(46/59)。NSCLC组中PTEN、PI3K蛋白的阳性表达率分别与正常肺组织和癌旁增生肺组织相比,差异均有显著性(P〈0.05)。PTEN蛋白阳性表达率与肺癌的组织学分型、分化程度无关(P〉0.05),而与淋巴结转移有关(P=0.009)。PI3K蛋白的阳性表达率与NSCLC的组织学类型无关(P〉0.05),但与细胞分化程度以及与淋巴结转移均有关(P〈0.05)。PTEN与PI3K之间具有显著负相关性(P=0.003)。结论PI3K蛋白的过表达和PTEN蛋白的低表达与肺癌的发生以及肺癌的浸润转移密切相关。PTEN蛋白的低表达可能刺激了PI3K蛋白的强表达。
简介:InordertoinvestigatewhetherlipoxinA4(LXA4)hasanantagonisticeffectonlipopolysaccharide(LPS)-inducedsynthesisofinterleukin(IL)-1β,IL-6andIL-8inratpulmonarymicrovascularendothelialcells(PMVEC),andtoexplorethemolecularmechanismsofsignalpathwayinLXA4actions,culturedPMVECweretreatedwithLPS,withorwithoutpreincubationwithLXA4.ProteinsofIL-1β,IL-6andIL-8insupernatantwereanalyzedbyenzyme-linkedimmunosorbentassay(ELISA).ExpressionsofmRNAofIL-1β,IL-6andIL-8weredeterminedbyRT-PCR.Expressionsofphosphorylationofphosphoinositide3-kinase(PI3-K)andmyeloiddifferentiationfactor88(MyD88)wereanalyzedbyWesternblot.ActivitiesofDNA-bindingofnuclearfactor-kappaB(NF-κB)andactivatorprotein-1(AP-1)weremeasuredbyelectrophoreticmobilityshiftassay(EMSA).TheresultsshowedthatLPSinducedproductionofIL-1β,IL-6andIL-8inratPMVECviaMyD88/PI3-K/NF-κBandAP-1pathway-dependentsignaltransduction.LPS-stimulatedexpressionofPI3-K,activitiesofNFκBandAP-1,secretionofproteinandexpressionofmRNAofIL-1β,IL-6andIL-8butnotMyD88expressioninPMVECwereinhibitedbyLXA4inadose-dependentmanner.Inconclusion,LXA4inhibitssynthesisofIL-1β,IL-6andIL-8bydown-regulationofPI3-K/NF-κBandAP-1signalpathwayinPMVEC.
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简介:为研究乳宁Ⅱ号方(主药:生黄芪、太子参、当归、枸杞、天门冬、淫羊藿、鹿角片、米仁、莪术、八月札、露蜂房、山慈菇)的作用机理,将体外培养的MA891细胞接种在小鼠右腋皮下,然后将小鼠分为生理盐水组(A)、环磷酰胺(CTX)组(B)、CTX+乳宁Ⅱ号组(C)、乳宁Ⅱ号组(D)、扶正组(E)、祛邪组(F).各组小鼠分别给予相当于临床成人用量2倍的上述各种药物治疗.21天后处死小鼠,运用免疫组化和PT-PCR方法观察各组小鼠乳腺癌血管内皮生长因子(VEGF)及其受体f1K-1蛋白和mRNA的变化.结果:B、D、C、E、F组都能减少VEGF、f1K-1蛋白和mRNA的表达,其中C组效果最好,D组次之.提示:抑制VEGF、f1K-1的表达,从而抑制肿瘤的血管生成,可能是乳宁Ⅱ号的作用机理之一;乳宁Ⅱ号与化疗药CTX有协同作用.
简介:CHANGESOF6-K-PGF1aRELEASEFROMTHELUMINALSURFACEOFDACRONSEEDEDWITHAUTOLOOUSVENOUSTISSUEFRAGMENTSCHANGESOF6-K-PGF1aRELEASEFROMTH...
简介:临床上患者和牙医越来越重视天然牙根的保留,利用完善根管治疗过的牙根做桩冠修复,越来越普遍[1].前牙牙冠缺失,不仅影响切割和发音功能,而且影响面部外形美观.利用桩钉插入根管内得以获得固位的桩冠修复,特别是烤瓷桩冠的修复,不仅固位良好,颜色和形态均能接近天然牙.但是,如果在桩冠制作的过程中,桩钉选择不当,桩钉加工技术欠缺,或者因外部因素,如外伤,咬合创伤等,均可造成桩钉的折断或脱落.临床上常采用取出断端桩钉,重新修复.当断面发生在根中1/3处,根内部分牢固,X线片显示根内部分较长(大于5mm),且临床上又难以取出时,作者认为可以不取出断端,采用桩钉两端凹凸相嵌的办法,进行桩冠修复.
简介:Objective:AllelicpolymorphismsofCCR5△32、CCR2b-64I,CX3CR1-249I280MandSDF1-3’AassociatedwithHIV-1infectionanddiseaseprogressionwereinvestigatedinindigenousUygurpopulationsfromtheXinjiangUygurAutonomousRegionofChina.Mithods:Thestudypopulationcomprised316healthyUygursubjectswithanagerangeof1-80yearsold,fromwhomwholeperipheralbloodsampleswerecollectedandnonewereHIV-1seropositive.GenomicDNAsampleswerepurifiedusingaQiagenBloodKit.GenotypingoftheaforementionedfouralleleswasperformedusingPCRorPCR/RFLPassay,andfurtherconfirmedbydirectDNAsequencing.Results:TheallelicfrequenciesinChineseUygurpopulationwereasfollows:3.48%forCCR5△32;19.45%forCCR2b-64I;13.8%forCX3CRI-249I280Mhaplotype,and20.41%forSDFI-3’A.MutantalleledistributionsamongUygurpopulationswereinaccordancewiththeHardy-Weinbergequilibrium.NostatisticaldifferencewasfoundbetweenthefrequencyofthethreeHIVcoreceptorsandtheirrespectiveligandgenes.Conclusion:ThefrequencyofSDF1-3’AandCX3CR1-249I280MhaplotypemorecloselymatchedthehanChinese.ThefequencyofCCR5△32inUygurpopulationswasbetweenCaucasianandHanfrequencies,themorecloselymatchingthefrequencyinMedi-Asiapeople.NogeneticlinkagebetweenanytwoofthethreeHIVcoreceptorgeneswasfound,butobviousgeneticlinkagesexistedbetweenCX3CR1-249IandCX3CR1-280M,withevenhigherlinkagedegreesthanCaucasianpeople.
简介:“公共场所空气中可吸入颗粒物(PMl0)测定方法—光散射法”己作为卫生部标准正式发布实施。本文介绍了为执行该标准新研制的LD一3C型微电脑激光粉尘仪的性能指标和技术特点,并通过介绍激光粉尘仪质量浓度转换系数K值的测定实例,说明该仪器在公共场所空气质量检测中应用的可行性。