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:目的:探讨延胡索乙素(Tetrahydropalmatine,Tet)逆转人乳腺癌细胞MCF-7多药耐药的作用机制.方法:采用SRB法测定药物对细胞的毒性作用;通过免疫细胞化学技术分析药物对细胞Pgp、Lrp、Mrp、Gst、TopoⅡ等多药耐药相关蛋白表达的影响.结果:Tet在浓度小于2.5μg/ml时对MCF-7无毒性作用,2.5μg/ml的Tet可明显逆转MCF-7/ADM耐药细胞的耐药性.MCF-7/S细胞不表达Pgp,而高表达TopoⅡ;MCF-7/ADM细胞Pgp高表达,但TopoⅡ低表达.Lrp、Mrp、Gst在MCF-7/S及MCF-7/ADM中的表达无明显差异.加入Tet后MCF-7/ADM细胞Pgp蛋白的表达明显下降,Topo的表达显著升高,其它几种蛋白的表达无明显变化.结论:Tet具有逆转MCF-7细胞MDR的作用,主要通过下调肿瘤细胞内Pgp的表达、上调TopoⅡ的表达而达到逆转耐药的效果.
简介:Thestereochemistryoftwo6,9-oxygenbridgedibenzocyclooctadienelignansfromKadsuracoccinea,aredifficulttoseparateandveryunstable.Thepresentstudywasdesignedtodevelopahigh-performanceliquidchromatographyusingcirculardichroismdetectionfortheanalysisofthestereochemistry.Anew6,9-oxygenbridgedibenzocyclooctadienelignansnamedKadsulignanQwasfirstlyfoundwithanS-biphenylconfiguration.TheothercompoundwasidentifiedasKadsulignanLwithanR-biphenylconfiguration.Inordertoobtainkineticdataontheirreversibleinterconversion,thestabilitywasmeasuredatdifferentdeuteratedsolventssuchasdeuteratedmethanol,deuteratedchloroformanddeuterateddimethylsulfoxide.Thelignansweremoreunstableandconvertedmoreeasilyindeuteratedmethanolthanindeuteratedchloroformanddeuterateddimethylsulfoxide.
简介:目的:研究四逆汤及拆方水煎液对体外培养的缺血缺氧大鼠心肌细胞H9C2的保护作用。方法:利用厌氧培养盒构建厌氧环境,以D-Hanks液模拟缺血液,构建H9C2的缺血缺氧模型;将加有D-Hanks稀释过的四逆汤及拆方水煎液的H9C2置于厌氧盒中培养,MTT法测定H9C2的存活率;ELISA法测定细胞培养上清中肿瘤坏死因子-α(TNF-α)、肌酸激酶同工酶(CK-MB)的含量。结果:四逆汤及拆方加药组(四逆汤加药组、附子+干姜加药组、附子+甘草加药组、甘草+干姜加药组、甘草加药组、附子加药组、干姜加药组)在浓度均为5mg生药/ml时,与模型组比较均能提高H9C2的存活率;其中附子+干姜组(108.2±5.0)、四逆汤全方组(82.3±2.0)、附子组(78.4±10.0)均能明显提高缺血缺氧H9C2的存活率;细胞上清中CK-MB含量与TNF-α含量呈正相关(r=0.866),细胞存活率与TNF-α含量呈负相关(r=-0.0846)。结论:四逆汤及拆方水煎液通过抑制细胞TNF-α的释放,显著减少H9C2的凋亡,提高细胞存活率,对缺血缺氧的H9C2有直接保护作用。
简介:Capsaicin(trans-8-methyl-N-vanillyl-6-nonenamide)isthemaincomponentinhotpeppers,includingredchilipeppers,alapenos,andhabanero,belongingtothegenusCapsicum.Capsaicinisapotentantioxidantthatinterfereswithfreeradicalactivities.Inthepresentstudy,thepossibleprotectiveeffectofcapsaicinwasstudiedagainstmethylmethanesulphonate(MMS)inducedtoxicityinthirdinstarlarvaeoftransgenicDrosophilamelanogaster(hsp70-lacZ)Bg~9.ThethirdinstarwasallowedtofeedonthediethavingdifferentdosesofcapsaicinandMMSseparatelyandincombination.TheresultssuggestedthattheexposureofthirdinstarlarvaetothediethavingMMSaloneshowedsignificanthsp70expressionaswellastissueDNAandoxidativedamage,whereasthelarvaefeedonthediethavingMMSandcapsaicinshowedadecreaseinthetoxiceffectsfor48-hofexposure.Inconclusion,capsaicinshowedadose-dependentdecreaseinthetoxiceffectsinducedbyMMSinthethirdinstarlarvaeoftransgenicDrosophilamelanogaster.
简介:目的:研究血竭素高氯酸盐(DracorhodinPerchlorate,DP)抗乳腺癌作用及作用机制。方法:四甲基噻唑蓝法分析60μmol·L^-1DP作用不同时间后,其对肿瘤细胞的抑制率;细胞形态学分析、细胞核形态学分析和DNA片段化分析确定细胞凋亡的发生;Rhodamine123染色分析细胞线粒体膜电位;Western检测细胞凋亡相关特别是线粒体相关蛋白表达。结果:60μmol·L^-1DP时间依赖性地抑制人乳腺癌MCF-7细胞生长;DP抑制细胞生长通过诱导MCF-7细胞凋亡来实现;DP诱导细胞凋亡时,其活化了线粒体通路蛋白caspase-9,剪切了DNA损伤修复蛋白PARP;进一步研究发现DP诱导细胞凋亡的主要原因是其降低了细胞线粒体膜电位(正常膜电位细胞百分比93.11%;DP处理后正常膜电位细胞百分比37.45%);而线粒体上Bcl-2、Bcl—XL表达减少,Bax、Bak增多是DP改变线粒体膜电位的主要原因。结论:DP通过调节线粒体通路来促进细胞凋亡。
简介:目的:观察温阳通脉方含药血清是否在内质网应激相关通路对心肌细胞缺氧/复氧损伤的作用,并探究体外培养时最佳给药剂量。方法:以20%含药血清处理,用四甲基偶氮唑盐(MTT)法测得CoCl2烫最佳浓度和各组细胞存活率;比色法检测各组半胱氨酸蛋白酶3(Caspase3)酶活性和上清液中乳酸脱氢酶(LDH)活性;Hoechst33342荧光染色观察各组细胞凋亡形态变化;流式细胞术检测各组细胞凋亡率;WesternBlot法检测各组内质网应激相关蛋白GRP78、Caspase12、CHOP表达以及凋亡相关蛋白Bcl-2、Bax表达情况。结果:与空白对照组血清相比,模型组细胞活性明显降低,Caspase3酶活性和LDH活性明显升高,细胞凋亡数量明显增多,凋亡率明显升高,GRP78、Caspase12、CHOP和Bax表达明显增多,Bcl-2表达明显减少;与模型组相比,3.24、6.48、12.96g/kg组含药血清能够不同程度改善细胞活性,Caspase3酶活性和LDH活性明显减少,凋亡率不同程度降低,GRP78、Caspase12、CHOP和Bax表达明显减少,Bcl-2表达不同程度增多。结论:温阳通脉方能减轻缺氧/复氧后H9C2心肌细胞损伤,其机制可能与温阳通脉方抵抗内质网应激介导的细胞凋亡有关,其抗凋亡程度呈剂量依赖性,以温阳通脉方12.96g/kg组效果最佳。
简介:目的:研究白藜芦醇四甲氧基衍生物(TMS)对人乳腺癌细胞MCF-7和耐阿霉素(doxorubicin,DOX)的人乳腺癌细胞MCF-7/DOX这两株细胞增殖的影响,探讨白藜芦醇四甲氧基衍生物能否提高耐药细胞MCF-7/DOX对阿霉素的敏感性。方法:用SRB法检测白藜芦醇四甲氧基衍生物的细胞毒性,同时检测白藜芦醇四甲氧基衍生物和DOX联用后对细胞株MCF-7/DOX药物敏感性的影响,用Western-blot方法检测不同浓度的白藜芦醇四甲氧基衍生物对P-gp蛋白表达的影响,罗丹明转运实验考察白藜芦醇四甲氧基衍生物对P-gp转运活性的影响。结果:白藜芦醇四甲氧基衍生物(7.5、15、30μg/ml)能够有效抑制耐药细胞MCF-7/DOX的增殖,然而与此相应的浓度范围内白藜芦醇的细胞增殖抑制作用较差,使用非细胞毒性剂量(3、6μg/ml)的白藜芦醇四甲氧基衍生物能有效提高MCF-7/DOX对阿霉素的敏感性,Western-blot结果显示6μg/ml的白藜芦醇四甲氧基衍生物能够明显下调P-gp的表达,此外,罗丹明转运实验显示白藜芦醇四甲氧基衍生物组(3、6μg/ml)细胞内罗丹明123积累量均有上升,表明白藜芦醇四甲氧基衍生物可以抑制P-gp的转运活性。结论:白藜芦醇四甲氧基衍生物可通过抑制P-gp表达和活性的方式增加MCF-7/DOX对阿霉素的敏感性,从而逆转耐药。
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.