简介:目的探讨肾上腺素对THP-1源巨噬细胞三磷酸腺苷结合盒转运体A1(ABCA1)与清道夫受体AI(SR-AI)mRNA表达的影响。方法不同浓度肾上腺素(1pmol/L~1μmol/L)处理THP-1源巨噬细胞24h,运用逆转录多聚酶链反应检测其ABCAl与SR-AImRNA表迭。结果1pmol/L~10nmol/L的肾上腺素对受试基因mRNA的表达与相应对照组比较其差异无统计学意义(P〉0.05)。而100nmol/L及1μmol/L的肾上腺素上调SR-AImRNA水平和下调ABCA1mRNA水平,与各自对照组比较其差异有统计学意义(P〈0.05)。结论肾上腺素上调THP-1源性巨噬细胞SR-AImRNA水平,下调其ABCA1mRNA水平。
简介:Objective:Toobservetheinfluenceofintra-articularinjectionofsodiumhyaluronate(HA)onthemRNAexpressionsofmatrixmetalloproteinase-1,-3(MMP-1,-3)andtissueinhibitorofmetalloproteinase-1(TIMP-1)incartilageandsynoviumoftraumaticosteoarthritis(OA).Methods:Sixteenwhiterabbitsunderwentunilateralanteriorcruciateligamenttransection(ACLT)weredividedinto2groupsrandomly5weeksaftertransection.Theexperimentalgrouprabbitsreceived0.3mlof1%HAbyintra-articularinjectiononceaweek.Animalsinthecontrolgroupweretreatedunderthesameconditionsusingphysiologicalsaline.Tenweeksfollowingsurgery,cartilageandsynoviumwereharvested.ThemRNAexpressionsofMMP-1,MMP-3andTIMP-1wereanalyzedusingreversetranscription-polymerasechainreaction(RT-PCR).Results:Insynovium,themRNAexpressionofMMP-3wassuppressedintheHAinjectiongroup.HAtreatmenthadnoeffectontheMMP-3expressionincartilage.NosignificantdifferenceofMMP-1andTIMP-1expressionsincartilageandsynoviumwasfoundbetweentheHAinjectiongroupandthecontrolgroup.Conclusions:OneofthemechanismsofthetherapeuticeffectofHAmaybetheinhibitionofexpressionofMMP-3insynoviumduringearlystageoftraumaticOA.
简介:用体外造血祖细胞集落形成技术,观察人参皂甙Rg1和Rb1对正常人粒-巨噬系祖细胞(CFU-GM)的刺激增殖作用,实验结果表明;Rg1浓度为2.5,5,10和50ug/ml时CFU-GM集落产率均显著高于对照组(P<0.01),提高率分别为(39.8±3.6)%,(70.6±6.8)%,(63.0±6.4)%和(60.8±5.9)%,Rb1浓度为0.5,2.5,5,10和50ug/ml时CFU-GM集落产率均明显高于对照组(P<0.05)。提高率分别为(24.5±2.3)%,(45.6±4.7)%,(54.6±6.1)%,(65.1±6.3)%和(58.3±5.7)%。高浓度(50ug/ml)不显示抑制作用,上述结果说明,Rg1和Rb1对CFU-GM具有明显的刺激增殖作用,且高浓度时亦不抑制。
简介:目的:研究共刺激分子4-1BB在γδT细胞表面的表达及其在γδT细胞活化和增殖中的应用。方法:用结核杆菌(Mtb)低分子多肽抗原刺激人外周血单个核细胞,利用流式细胞术(FCAS)检测不同时相γδT细胞膜表面4-1BB的表达;用4-1BBL高表达的Jurkat细胞提供4-1BBL/4-1BB共刺激信号,同时用4-1BBL单抗阻断其刺激信号,PCAS检测γδT细胞的增殖比率和细胞内IFN-γ的表达情况。结果:静止的γδT细胞膜表面不表达4-1BB分子,Mtb抗原刺激48h4-1BB表达达到高峰(4979%);阻断4-1BBL/4-1BB共刺激途径后,γδT细胞的增殖和细胞内IFN-γ的分泌均明显下降(P<0.05)。结论:4-1BB在γδT细胞活化后能迅速表达,4-1BBL/4-1BB共刺激信号在γδT细胞活化和增殖中发挥重要的作用。
简介:目的:1,25-二羟维生素D3[1,25-(OH)2D3]对连续多次小剂量链脲菌素(themultiplelowdosestreptozotocin,MLDS)诱导的自身免疫性糖尿病小鼠的预防作用及其机制初探.方法:小鼠分为三组.正常对照组:连续5天腹腔注射与糖尿病组等容量柠檬酸盐缓冲液;糖尿病组:连续5天腹腔注射STZ(40mg·kg^-1),以血糖水平持续高于16.7mmol/L为成模标准;预防组:先隔日腹腔注射1,25-(OH)2D3(5μg·kg^-1),共15次,然后再连续5天腹腔注射STZ(40mg·kg^-1).实验结束后各组动物处死收集血清并采集胰腺检测诱导型一氧化氮合酶(iNOS)活性及血清胰岛素水平.结果:MLDS诱发的自身免疫性糖尿病模型在第四周基本建成.MLDS使小鼠血糖、血清及胰腺iNOS活性升高,血清胰岛素水平下调;预防组小鼠注射STZ前给予1,25-(OH)2D3有明显降血糖和上调血清胰岛素水平作用,同时抑制血清及胰腺iNOS活性,与糖尿病组比较有显著性差异(P<0.05).结论:1,25-(OH)2D3可有效预防MLDS诱导的自身免疫性糖尿病的发生.该效应可能与1,25-(OH)2D3抑制iNOS活性有关.
简介:Objective:Toanalyzesubtypesandquasi-speciesofisolatedvirusesfromHIV-1infectedindividualsamongthepopulationepidemiologicaldynamicsoflocalHIV-1isolates,thuslayingafoundationfordesigningacandidateAIDSvaccine.Methods:Byhetero-duplexmobilityassay(HMA)andsinglestrandconformationpoly-morphism(SSCP)analysisonampliconsfromsingle-primedpolymerasechainreaction(SP-PCR),subtypesandquasi-speciesoftestedHIV-1isolateswereelucidated,andampliconsweresequencedforconfirmation.Results:Specificampliconsfromdifferentsubtypesandquasi-speciesofHIV-1couldbediscerniblebyHMAandSSCPanalysis.HIV-1isolatesfromdifferentpatientsmightbeeitheradifferentsrbtypeoranidenticalsubtype,andHIV-1isolatesfromanindividualwerepresentinapopulationofquasi-species.
简介:Objective:ToevaluatethehumoralimmuneinductioninratsofacandidateAIDSvaccineexpressingthegagp24genefromasubtypeBHIV-1isolate.Methods:Theamplifiedp24genewasinsertedintoaneukaryoticexpressionvectortoformthesupercoiledDNAvaccine.ThelinearizedexpressedDNAvaccinewaspreparedfromtheexpressionplasmidbypolymerasechainreaction(PCR).TheantigengeneexpressioninratsofthelinearizedandsupercoiledDNAvaccineswereinvitroandinvivodetected.Results:InvitrotranscriptionandNorthernhybridizationshowedthatthelinearizedDNAvaccinecouldsynthesizeamountsofp24mRNAsimilartothesupercoiledDNAvaccine.AntibodyassaysofinoculatedratsconfirmedthatthelinearizedexpressionDNAcouldinduceaslightlyhigherantibodytiterthantheexpressionplasmid,whilethehighestantibodytiterhadbeeninducedbyplasmidplusadjuvantinoculation.Conclusion:TheconstructionofacandidateAIDSvaccinebasedonthep24genecouldshedlightonapotentialHIVvaccine,meritingevaluationinarhesusmacaqueSHIV-AIDSmodel.
简介:RecombinanthumanGABAAreceptorswereinvestigatedinvitrobycoexpressionofcDNAscodingforα1,β2andγ2subunitsinthebaculovirus/Sf-9insectcellsystem,Asingleaminoacidexchangeα1(asparaticacid151toasparaginorα1(threonine149toglutamine)intheN-terminal,extracellularpartoftheα1subunitinducedabout10folddecreaseinanantagonistpitrazepineaffinity.OtherGABAAreceptorligandshadlittledifferenceintheiraffinity.Itwaslikelythat151and149aminoacidresidueswereessentialforthebindingaffinityandefficacyofpitrazepinetoGABAAreceptorcombinationscontainiαααααααααnganα1subunit.