简介:目的:通过比较两种肥大细胞模型RBL-2H3和P815细胞激活后脱颗粒反应的差异,寻找早期、稳定、敏感的肥大细胞脱颗粒体外检测模型,为进一步建立基于细胞水平的过敏原和抗过敏药物的体外筛选模型提供一定的参考。方法:10μg·mL^-1C48/80激活细胞15-60min,比色法检测组胺、β-氨基己糖苷酶及类胰蛋白酶等过敏介质的释放,中性红染色法进行形态学观察,流式细胞法检测AnnexinV阳性细胞率。结果:C48/80刺激P815、RBL-2H3细胞15-60min后组胺释放率均明显增加,并且相同刺激条件下,两种细胞模型的组胺释放率基本相当。C48/80刺激P815细胞15min以上,β-氨基己糖苷酶释放率、类胰蛋白酶释放率、AnnexinV阳性细胞率和中性红染色脱颗粒细胞率均明显增加;但相同浓度的C48/80需刺激RBL-2H3细胞30-45min以上,上述指标才出现显著增加。在相同的刺激条件下,P815细胞过敏介质释放率、AnnexinV阳性率和脱颗粒率均高于RBL-2H3细胞。结论:同RBL-2H3相比,在相同刺激条件下,P815细胞活化后脱颗粒时间出现更早、程度更高。提示除RBL-2H3细胞,P815细胞也可作为一种早期、稳定、敏感的肥大细胞脱颗粒体外检测模型。
简介:目的:研究清燥救肺汤对乌拉坦诱导肺癌模型鼠TGF-β1、Smad2和p38MAPK的影响。方法:选择清洁级KM小鼠,随机分为6组,即正常组、模型组、六味地黄丸4.6g/kg组、清燥救肺汤33.6g/kg、16.8g/kg、8.4g/kg组。除正常组外,其余各组小鼠腹腔注射乌拉坦800mg/kg,每周两次,连续五周,复制小鼠肺癌模型。给药与造模同时进行,1次/d,连续15周。清燥救肺汤33.6g/kg、16.8g/kg、8.4g/kg组、六味地黄丸4.6g/kg组分别给予等体积药物,正常组与模型组灌胃生理盐水。15周后,取肺脏检测。肉眼及镜下计数双肺小鼠肺肿瘤结节数,并计算小鼠肺肿瘤发生率;WesternBlot测定肺组织TGF-β1、Smad2和p38MAPK蛋白的表达;免疫组化检测肺组织TGF-β1、Smad2和p38MAPK活性的表达。结果:清燥救肺汤(8.4、16.8、33.6g/kg)均能使肺肿瘤发生率从91.7%降至58.3~75.0%,平均肿瘤结节数从5降至3,明显降低肺癌模型鼠肺组织TGF-β1、Smad2和p38MAPK蛋白的表达,并可使肺组织中TGF-β1、Smad2和p38MAPK活性的表达也显著下降。结论:清燥救肺汤可能通过抑制TGF-β1、Smad2和p38MAPK的过度表达,从而多靶点调控TGF-β1/Smad2及p38MAPK等信号通路来实现延缓肺癌的发生发展及转移。
简介:Inthepresentstudy,aseriesofnovelnitricoxide-hydrogensulfidereleasingderivativesof(S)-3-n-butylphthalide((S)-NBP)weredesigned,synthesized,andevaluatedaspotentialantiplateletagents.CompoundNOSH-NBP-5displayedthestrongestactivityininhibitingthearachidonicacid(AA)-andadenosinediphosphate(ADP)-inducedplateletaggregationinvitro,with3.8-and7.0-foldmoreeffectivenessthan(S)-NBP,respectively.Furthermore,NOSH-NBP-5couldreleasemoderatelevelsofNOandH2S,whichwouldbebeneficialinimprovingcardiovascularandcerebralcirculation.Moreover,NOSH-NBP-5couldrelease(S)-NBPwhenincubatedwithratbrainhomogenate.Inconclusion,thesefindingsmayprovidenewinsightsintothedevelopmentofnovelantiplateletagentsforthetreatmentofthrombosis-relatedischemicstroke.
简介:目的:观察甘草次酸对哮喘大鼠气道炎症、气道重塑及肺组织Casepase-3、Bax、Bcl-2表达的影响,探讨其抗哮喘机制。方法:将60只雄性大鼠随机分为正常对照组、哮喘模型组、地塞米松组及甘草次酸(200、100、50mg/kg)剂量组。以卵清蛋白加氢氧化铝致敏复制大鼠哮喘动物模型,病理观察甘草次酸对哮喘大鼠肺组织气道炎症浸润和气道重塑的影响;采用RT-PCR和Western-blot法检测哮喘大鼠肺组织Casepase-3、Bax及Bcl-2mRNA和蛋白表达。结果:与哮喘模型组比较,甘草次酸200mg/kg可减少哮喘大鼠肺组织炎症浸润,改善或逆转气道重塑;甘草次酸200、100mg/kg可上调哮喘大鼠肺组织Bax、Caspase-3mRNA和蛋白表达水平,下调Bcl-2mRNA和蛋白表达水平。结论:甘草次酸对哮喘大鼠气道炎症及气道重塑有较好的改善作用,其机制可能与上调促凋亡因子Bax、Caspase-3和下调抗凋亡因子Bcl-2有关。
简介:ThesaponinginsenosideRk1isamajorcompoundisolatedfromginseng.GinsenosideRk1hasbeenreportedtohaveanti-inflammatoryandanti-tumorpropertiesandtobeinvolvedintheregulationofmetabolism.However,theeffectandmechanismofanti-inflammatoryactionofginsenosideRk1hasnotbeenfullyclarified.WeinvestigatedwhetherginsenosideRk1couldsuppresstheinflammatoryresponseinlipopolysaccharide-stimulatedRAW264.7macrophagesandtoexploreitsmechanismoftheaction.RAW264.7cellsweretreatedwithLPS(1μg×mL~(–1))intheabsenceorthepresenceofGinsenosideRk1(10,20,and40μmol×L~(–1)).ThentheinflammatoryfactorsweretestedwithGriessreagents,ELISA,andRT-PCR.TheproteinswereanalyzedbyWesternblotting.GinsenosideRk1inhibitedlipopolysaccharide-inducedexpressionofnitricoxide(NO),interleukin(IL)-6,IL-1β,tumornecrosisfactor(TNF)-α,andmonocytechemotacticprotein(MCP)-1.GinsenosideRk1inhibitedthelipopolysaccharide-stimulatedphosphorylationofNF-κBandjanuskinase(Jak)2andsignaltransducerandactivatoroftranscription(Stat)3atSer727andTyr705.ThesedatasuggestedthatginsenosideRk1couldinhibitexpressionofinflammatorymediatorsandsuppressinflammationfurtherbyblockingactivationofNF-κBandtheJak2/Stat3pathwayinLPS-stimulatedRAW264.7cells.
简介:目的:考察长期用药在血脑屏障上是否引起耐药性及P-糖蛋白(P-gp)表达增强.方法:原代牛脑微血管内皮细胞(BCEC)加入环孢素A(CsA),长春新碱(VCR),阿霉素(Dox),或粉防己碱(Tet),初始剂量分别为0.0083,0.091,0.34,或0.32μmol/L,培养至传代剂量翻倍.连续作用21,37,51或69d后,用罗丹明123(Rh123)检测P-gp功能.将各药物诱导69天的BCEC制膜,用酶联免疫吸附法(ELISA)测定P-gp表达.结果:Dox用药37d使胞内Rh123浓度降低38%.连续给药51和69d后,Dox分别使胞内Rh123浓度降低47%和57%,VCR组分别降低36%和40%.而CsA和Tet组一直未见明显变化.维拉帕米(10μmol/L)分别使CsA、Tet、Dox和VCR诱导组BCEC内Rh123的摄取增加92%、85%、143%和186%.Dox和VCR连续用药69d使P-gp的表达增强45%和32%.结论:长期使用Dox或VCR可在血脑屏障上诱导P-gp介导的耐药性以及P-gp表达增强.
简介:Thepresentstudywasdesignedtosynthesize2-Cyano-3,12-dioxooleana-1,9(11)-en-28-oate-13β,28-olide(1),alactonederivativeofoleanolicacid(OA)andevaluateitsanti-inflammatoryactivity.Compound1significantlydiminishednitricoxide(NO)productionanddown-regulatedthemRNAexpressionofiNOS,COX-2,IL-6,IL-1β,andTNF-αinlipopolysaccharide(LPS)-stimulatedRAW264.7cells.FurtherinvivostudiesinmurinemodelofLPS-inducedacutelunginjury(ALI)showedthat1possessedmorepotentprotectiveeffectsthanthewell-knownanti-inflammatorydrugdexamethasonebyinhibitingmyeloperoxidase(MPO)activity,reducingtotalcellsandneutrophils,andsuppressinginflammatorycytokinesexpression,andthusamelioratingthehistopathologicalconditionsoftheinjuredlungtissue.Inconclusion,compound1couldbedevelopedasapromisinganti-inflammatoryagentforinterventionofLPS-inducedALI.
简介:Thymoquinone(TQ),anactivecomponentderivedfromthemedialplantNigellasativa,hasbeenusedformedicalpurposesformorethan2000years.RecentstudieshavereportedthatTQblockedangiogenesisinanimalmodelandreducedmigration,adhesion,andinvasionofglioblastomacells.WehaverecentlyshownthatTQcouldexhibitapotentcytotoxiceffectandinduceapoptosisinmouseneuroblastoma(Neuro-2a)cells.Inthepresentstudy,TQtreatmentmarkedlydecreasedtheadhesionandmigrationofNeuro-2acells.TQdown-regulatedMMP-2andMMP-9proteinexpressionandmRNAlevelsandtheiractivities.Furthermore,TQsignificantlydown-regulatedtheproteinexpressionoftranscriptionfactorNF-κB(p65)butnotsignificantlyalteredtheexpressionofN-Myc.Takentogether,ourdataindicatedthatTQ'sinhibitoryeffectonthemigrationofNeuro-2acellswasmediatedthroughthesuppressionofMMP-2andMMP-9expression,suggestingthatTQtreatmentcanbeapromisingtherapeuticstrategyforhumanmalignantneuroblastoma.
简介:槐果碱可明显升高正常大鼠血浆6-酮-PGF1a含量,对TXB2无明显影响。小剂量(1mg/100g)阿斯匹林轻度降低血浆6-酮-PGF1a含量,但明显阻断槐果碱升高6-酮-PGF1a的作用。
简介:ThefruitsofPaulowniacatalpifoliaGongTongareusedasaChinesefolkherbalmedicineforthetreatmentofenteritis,tonsillitis,bronchitis,anddysentery,etc.OurpreviousstudyhasidentifiednewC-geranylatedflavanoneswithobviousanti-proliferativeeffectsinlungcancerA549cells.Inthepresentstudy,anewC-geranylatedflavone,paucatalinoneC(1)andfiveknownC-geranylatedflavanones(2-6)wereisolated.Inaddition,atotalof34C-geranylatedflavonoidsweredetectedbyHPLC-DAD-ESI-MS/MScouplingtechniquesfromtheCH_2Cl_2extractofP.catalpifolia.Futhermore,anti-agingeffectsofisolatedcompoundswereevaluatedinvitrowithprematuresenescent2BScellsinducedbyH_2O_2.PhytochemicalresultsindicatedthatP.catalpifoliawasanaturalresourceofabundantC-geranylatedflavonoids.Diplacone(3)andpaucatalinoneA(5)werethepotentanti-agingagentsintheprematuresenescent2BScellsinducedbyH_2O_2andtheC-geranylsubstituentmaybeanimportantfactorbecauseofitslipophiliccharacter.
简介:目的:探讨野西瓜挥发油(CapparisspinosaL.essentialoil,CSEO)对人肝癌HepG-2抑制生长和诱导凋亡作用及其机制。方法:MTT法研究CSEO对人肝癌HepG-2的抑制生长;荧光显微镜观察HepG-2细胞形态;流式细胞仪研究CSEO对HepG-2细胞周期的影响及诱导凋亡作用,罗丹明123单染观察CSEO对线粒体膜电位的改变;激光共聚焦显微镜检测CSEO对HepG-2细胞内Ca^2+浓度的影响。结果:CSEO对人肝癌HepG-2细胞生长具有明显的抑制作用,并且有剂量依赖性,IC50为127.5μg·mL^-1;CSEO作用48h后,HepG-2细胞在出现特征性凋亡形态特征,300μg·mL^-1组的凋亡细胞比率高达44.447%;75和150μg·mL^-1下出现G1期细胞阻滞,S期细胞比例下降,G2期细胞比例下降的趋势;CSEO各组线粒体膜电位(Δψm)有所降低,表现为曲线相左移行,此外,中、高浓度的CSEO还可以显著增加细胞内Ca^2+浓度。结论:CSEO对人肝癌HepG-2有明显的抑制生长和诱导凋亡作用,其机制可能与线粒体膜电位降低和钙超载有关。
简介:试图在安息香perkinsiae的bark学习化学成分。混合物与色析法的方法被孤立的方法,和他们的化学结构被阐明根据光谱数据。结果十混合物作为5-(2-propen-1-one)被孤立并且鉴别-7-methoxy-2-(3,4-methylenedioxyphenyl)benzofuran(1),1-hydryoxyegonolgentiobioside(2),obassiosideB(3),egonol(4),egonol配糖物(5),egonolgentiobioside(6),egonolgentiotrioside(7),styraxlignolideB(8),styraxjaponosideC(9),和masutakeside我(10)。结论混合物1和2是新2-phenylbenzofurans。
简介:目的:研究何首乌不同炮制品含药血清对H2O2诱导PC12细胞损伤的保护作用。方法:将何首乌生品、清蒸品、黑豆汁蒸品按20g/kg剂量小鼠灌胃给药,分别将其含药血清分别分成20%、10%、5%含药血清组,采用MTT法测定其对正常PC12细胞增殖的影响和对H2O2致PC12细胞损伤的保护作用,并用比色法测定SOD活性、LDH和MDA含量。结果:何首乌不同炮制品含药血清对正常PC12细胞增殖均无明显影响,含何首乌生品、黑豆汁蒸品各浓度血清和10%,5%含清蒸品血清可显著增强受损细胞内SOD活性(P〈0.05-0.01);10%,5%含生品血清、含黑豆汁蒸品各浓度血清和10%含清蒸品血清能明显降低受损细胞LDH释放量(P〈0.05-0.01);含清蒸品各浓度血清和20%,5%含黑豆汁蒸品血清能降低受损细胞的MDA释放量(P〈0.05),而含生品各浓度血清对细胞内MDA水平无显著降低作用。结论:含何首乌黑豆汁蒸品和清蒸品血清对H2O2致PC12细胞损伤有保护作用。