简介:BackgroundTaxifolin(Tax)isanessentialnaturalantioxidant.MultiplestudieshaveshownthatTaxcanprotectcardiomyocytesfromischemia-reperfusioninjury.However,theunderlyingmechanismisstillunclear.MethodsH9C2cellswererandomlydividedintocontrol,H_2O_2group,Taxpretreatmentgroup(Tax+H_2O_2);Taxeffectgroup.CellactivitywasdetectedbyCCK-8andtheintracellularstructurewasobservedbytransmissionelectronmicroscopy.AutophagywasdeterminebyWesternblottinganalysisofBeclin-1,Bcl-2andPKC.ResultsTaxpretreatmentsignificantlyincreasedanti-apoptoticproteinBcl-2andautophagyproteinBeclin-1.ExpressionofPKCwasinhibitedbyTax.ConclusionsTaxpretreatmentcouldprotectH9C2cellsagainstH_2O_2-induceddamagethroughtheBcl-2andautophagypathways.
简介:目的探讨橙皮素(HES)对H2O2诱导的H9c2心肌细胞凋亡的影响.方法采用H2O2建立H9c2心肌细胞氧化应激损伤模型.实验分为4组:正常对照组(Control组)、H2O2损伤组(H2O2组)、单纯橙皮素处理组(HES组)、橙皮素预处理+H2O2组(HES+H2O2组).H2O2(400μM)处理2h建立心肌细胞氧化应激损伤模型,HES+H2O2组于建模前1h加入40μM橙皮素.采用CCK-8法确定H9c2细胞活性,DCFH-DA探针检测细胞活性氧簇(ROS)水平,流式细胞术检测心肌细胞凋亡,分光光度计检测Caspase-3活性.结果橙皮素预处理可明显改善H2O2诱导的H9c2心肌细胞活性降低,且浓度为40μM时保护作用最明显;给予40μM橙皮素预处理后ROS的产生明显减少,Caspase-3活性显著下降,心肌细胞凋亡率为(28.32±2.12)%,明显低于H2O2组(50.33±2.56)%(P〈0.05).结论橙皮素对氧化应激诱导的心肌细胞凋亡具有抑制效应.
简介:BackgroundComparedtoclopidogrel,Ticagrelorsignificantlyreducestheriskofcardiovasculareventsinpatientswithacutemyocardialinfarction(AMI)howeverincreasestheincidenceofbleedingandtheriskoffatalintracranialhemorrhage.Inthisstudy,wescreenedtheAMIpatientswithclopidogrelresistence,anddeterminedwhetherticagrelorsequentialtherapycouldreducetheriskofcardiovasculareventsandbleedingrisk.MethodsAtotalof319AMIpatientswereenrolledinthisprospectiveclinicalstudy.Theplateletinhibitionratesinadenosine5'-diphosphate(ADP)pathwaysweremeasuredbyathrombelastography(TEG)system.ThepatientswithclopidogrelresistanceweredividedintoTicagrelorsequentialtherapygroup(ticagrelorfor3monthsandclopidogrelfor9months,n=143)andClopidogrelgroup(clopidogrelfor12months,n=176).Theriskofmajoradversecardiacevents(MACE)andthesafetyendpointsat1-yearfollow-upwereanalyzed.ResultsTheratesofstentthrombosis(ST)(2.1%vs.8.0%,P=0.017)orMI(2.8%vs.10.2%,P=0.009)werelowerintheticagrelorsequentialtherapygroupthanintheclopidogrelgroup.Dyspneawasmoreoftenintheticagrelorsequentialtherapygroupthanintheclopidogrelgroup(17.5%vs.4.5%,P<0.001).Nosignificantdifferenceintherateofmajorbleedingwasfoundbetweenthegroups(3.4%vs.3.9%,P=0.528).ConclusionsInAMIpatientswithhyporesponsivenesstoclobidogrelticagrelorsequentialtherapygroupsignificantlydecreasedtheratesofSTandMIwithoutincreasedriskofmajorbleedingascomparedwithclopidolgrel.
简介:目的评价CHADS22及CHA2DS2-VASc评分系统在冠心病外科治疗中的意义.方法选择2006年1月至2010年1月行不停跳冠状动脉旁路移植术的768例患者,术后新发房颤患者97例.回顾患者的围术期及随访资料,应用CHADS2及CHA2DS2-VASc评分系统进行分析.结果768例患者术后新发房颤发生率12.6%,分为术后新发房颤组与非房颤组.新发房颤组与非房颤组平均年龄分别为(70.74±8.21)岁和(65.90±9.83)岁,围术期脑卒中分别为8例和9例,CHADS2评分值分别为3.20±1.26和2.13±0.94,CHA2DS2-VASc评分值分别为4.20±1.50和3.23±1.07.CHADS2和CHA2DS2-VASc评分是术后新发房颤的预测因素,与围术期脑卒中显著相关(P<0.01).结论冠心病外科治疗中应用CHADS2及CHA2DS2-VASc评分系统可预测术后新发房颤及围术期脑卒中,对冠心病术后新发房颤的抗凝及抗血小板治疗决策提供了依据,对卒中风险及预后有一定的评估价值.
简介:Inspiteofrecentadvancesintreatmentandcontrol,theprevalenceofCVDandpulmonaryhypertension(PH)aroundtheworldhasincreasedsignificantly.Webelievethataconceptualbreakthroughisneededandnoveldrugtargetsmustbediscoveredinanattempttocontrolandtreatthem.ACE2,thenewestmemberoftherenin-angiotensinsystem(RAS),appearstoholdthispotential.Ourstudieshaveestablishedanovelconcept:abalancebetweenthevasodeleteriousaxis(ACE/AngⅡ/ATlR)andthevasoprotectiveaxis(ACE2/Ang-1-7/Mas)oftheRASiscriticalinmaintainingnormalCVfunctionsandanyimbalanceinitiatesvasculardysfunctionsleadingtocardiopulmonarydiseases.ThuswehypothesizethatACE2,whichisakeyenzymeindecreasingAngⅡandincreasingAng-1-7,wouldbeanidealforconsiderationasatherapeutictarget.Theobjectiveofmypresentationwillbetopresentevidenceinsupportofthisconcept.ThedatapresentedwilldemonstratethatoverexpressionofACE2bygeneticmeansoritsactivationbenovelACE2activatorsproteststheheartfromhypertension-andMi-inducedcardiacdamage.Also,thisstrategyisextremelyeffectiveinpreventionandreversalofPHandpulmonaryfibrosis.Astructure-baseddrugdiscoveryapproachwillbepresentedtoidentifysmallmoleculeACE2acti-vatorsandtheirpotentialinproducingbeneficialoutcomesonCVDandpulmonaryhypertensionwillbediscussed.
简介:BackgroundH9c2celllineismononucleatedmyoblastderivedfromembryonicrathearttissue.ActivitiesofTGF-β1,MMP-2andMMP-9increaseinH9c2cellsaftertreatmentwithfibrosisstimuli.MicroRNA(miRNA),akindofendogenoussmallnon-codingRNA,participatesincardiacfibrosis.Inthepresentstudy,expressionsoffibrosis-relatedgenesandmicroRNAsinTGF-β1treatedH9c2cellswereinvestigated.MethodsExpressionsoffibrosis-associatedgenes,includingCol3a1,α-SMA,FN1,CTGFandTSP-1,weremeasuredinTGF-β1treatedH9c2cellsbyquantitativereversetranscriptionandPCR(qRTPCR).Levelofα-SMAinH9c2cellswasdemonstratedbyfluorescenceimmunohistochemistry(FIHC)assay.ExpressionsofmaturemiR-16,-21a,-29binH9c2cellsweredeterminedbyqRT-PCRassay.ActivationsofSmad3andNF-kBsignalinginTGF-β1-treatedH9c2cellswerestudiedbydualluciferaseassay.ExpressionsofCol3a1,α-SMA,FN1,CTGFandTSP-1weredetectedinH9c2cellswithadenovirus-mediatedoverexpressionofmiR-21a.ResultsqRT-PCRassayshowedthatα-SMA,FN1,CTGF,TSP-1,butnotCol3a1,wereup-regulatedinTGF-β1treatedH9c2cells.FIHCresultalsorevealedthatα-SMAwasincreasedinTGF-β1-treatedH9c2cells.Consistently,dualluciferaseassayshowedthatSmad3andNF-kBsignalingproteinswereactivatedinTGF-β1-treatedH9c2cells.miR-21a,butnotmiR-16and-29b,wassignificantlyup-regulated.Additionally,over-expressionofmiR-21asignificantlyincreasesmRNAexpressionsofα-SMA,FN1,CTGFandTSP-1inH9c2cells.ConclusionsMiR-21aisup-regulatedinTGF-β1treatedH9c2cells,andmaycontributetoup-regulationsoffibrosis-associatedgenes.
简介:目的本研究旨在观察钙敏感受体(calcium-sensingreceptor,CaSR)在高糖诱导H9C2心肌细胞中的表达以及其对氧化应激的作用.方法将H9C2细胞在不同条件下干预24h,包括正常糖浓度组(NG组)、高糖组(HG组)、高糖+CaSR激动剂组(HG+GdCl3组)、高糖+CaSR抑制剂组(HG+NPS2390组).用CCK8试剂盒检测细胞存活率;DCFH-DA荧光探针检测细胞内活性氧簇(ROS)含量;用比色法检测细胞超氧化物歧化酶(SOD)和谷胱甘肽过氧化物酶(GSH-Px)活性以及丙二醛(MDA)含量.用Westernblot检测细胞CaSR蛋白表达水平.结果细胞存活率呈糖浓度依赖性降低[(89.00±1.54)%比(98.83±0.47)%,P<0.01],CaSR蛋白表达量呈糖浓度依赖性增加2.14±0.09比1.06±0.05,P<0.01).高糖诱导可使细胞发生氧化应激,SOD(14.14±0.57比22.86±0.58,P<0.01)与GSH-Px(2.62±0.59比3.04±0.89,P<0.01)活性降低,ROS(0.040±0.002比0.020±0.001,P<0.01)与MDA(0.83±0.05比0.54±0.02,P<0.01)生成增多.与HG组相比,HG+GdCl3组细胞氧化损伤加重(P<0.05).而HG+NPS2390组细胞氧化损伤减轻(P<0.05).结论高糖能上调CaSR蛋白表达进而促进氧化应激的发生.
简介:目的探讨血半胱氨酸蛋白酶抑制剂C(CystatinC)及β2微球蛋白(β2-MG)在高血压患者早期肾功能损害中的诊断价值。方法测定48例原发性高血压患者与40例健康成人的血尿素氮(BUN)、肌酐(Cr)、β2-MG与CystatinC,并进行对比分析。结果原发性高血压患者组的血CystatinC及β2-MG高于健康对照组[分别为(1.84±0.58)比(1.08±0.28)mg/L,P〈0.05;(2.60±0.58)比(1.92±0.15)mg/L,P〈0.01].结论血CystatinC及β2-MG可显示原发性高血压患者早期肾功能损害,其敏感性优于血BUN和Cr。
简介:目的:研究轻中度原发性高血压患者血栓索A2(TXA2)和前列环素(PGI2)含量及二者比值的变化,评价吲哒帕胺对轻、中度原发性高血压的降压疗效以及对TXA2、PGI2和TXA2/PGI2的影响,探讨吲哒帕胺对血管内皮功能和血小板活性影响的机制.方法:对30例轻、中度高血压患者和20例正常对照者的血浆采用放射免疫法测定TXA2、PGI2的水平,对高血压患者给予吲哒帕胺治疗2周,并进行治疗前、后对照比较.结果:高血压组TXA2水平明显高于对照组,而PGI2水平明显低于对照组,TXA2/PGI2明显高于对照组(P均<0.01).吲哒帕胺治疗组,降压有效率为60%,治疗后TXA2水平明显降低,PGI2水平明显升高,TXA2/PGI2明显下降(P均<0.01).结论:原发性高血压患者TXA2及TXA2/PGI2升高,PGI2水平下降.吲哒帕胺对轻、中度原发性高血压患者疗效显著,可引起TXA2水平显著下降,PGI2水平显著升高,对高血压所致的血管内皮损害具有保护作用.
简介:目的探讨瑞舒伐他汀对血脂正常的2型糖尿病患者血清高敏C反应蛋白(hs-CRP)的影响.方法选取2008年3月至2013年10月于我院诊治的血脂正常的2型糖尿病患者104例,按其就诊顺序进行编号并随机分为对照组(52例)和观察组(52例).对照组患者行常规降糖治疗;观察组患者在常规治疗基础上加用瑞舒伐他汀治疗,10mg/次,1次/d.观察两组患者治疗前后血脂(HDL-C、LDL-C、TG、TC)及hs-CRP水平变化情况,采用统计学软件对两组患者观察指标进行对比分析.结果观察组患者治疗后TC[(4.28±0.86)mmol/L]、TG[(3.25±0.89)mmol/L]、LDL-C[(2.09±0.57)mmol/L]、HDL-C[(1.38±0.43)mmol/L]水平均明显优于对照组患者相应指标[(5.33±1.00)mmol/L、(3.58±1.01)mmol/L、(3.18±0.74)mmol/L、(1.16±0.31)mmol/L],差异有统计学意义(P<0.05).观察组患者治疗后hs-CRP水平明显低于对照组,差异有统计学意义(P<0.05).结论瑞舒伐他汀在进一步改善血脂正常的2型糖尿病患者血脂水平的同时,可有效降低患者hs-CRP水平,对于减轻患者动脉粥样硬化程度、减少心脑血管意外具有重要意义.
简介:1临床资料与心电图例1男,69岁,因头昏、心慌、胸闷反复发作3个月就诊入院.听诊心律不齐,平均心率80次/min,无病理性杂音,血压160/90mmHg.临床诊断冠心病.入院时心电图(图1)示窦律,除aVF的P7(房早)外,PP匀齐,心率90次/min.QRS形态、时限、电压均正常,但节律明显不齐,且与P波无相互关系.据aVF导联的梯形图分析,P(心房激动)与QRS(心室激动)呈三度阻滞状态,阻滞区平面在房室交接区上层,在此平面之下形成加速性交接区节律,此节律逆传受阻,前传至心室呈文氏型传导.再据“文氏周期等同传导时间”的规律[1],从而推算出加速性交接区节律的频率约为84次/min,RR间期呈现“渐短突长”的特点,长RR间期将该导联分为3:2、4:3、2:1和4:3四个文氏周期,为此该例房室交接区的下层是加速性交接区节律伴结室文氏传导阻滞区.该患者适合安装人工心脏起搏器,但患者及家属拒绝而自动出院.
简介:目的:评价射频消融治疗阵发性室上性心动过速的延迟作用及其临床意义.方法:2例阵发性室上性心动过速患者住院行射频消融术.例1:镜像右位心,左侧隐匿性旁道在室房近融合处进行射频消融;例2:房室结双径路,进行了慢径改良术.结果:在消融放电时,例1患者的房室旁路可被阻断,但因停止放电后旁道复发而致术中消融失败,术后7天再次行心内电生理检查提示无旁道传导,随访5个月无心动过速复发.例2术后第5天出现胸闷、心悸、乏力症状,心电图及心内电生理检查提示房室传导阻滞,阻滞位置位于房室结.结论:认识和理解射频消融过程中发生的延迟作用具有非常重要的临床意义.