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时间:2019-05-24
《不同年龄小鼠缺血性心力衰竭后心室重塑程度的比较》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、·988·中国病理生理杂志ChineseJournalofPathophysiology2013,29(6):988-992[文章编号]1000-4718(2013)06-0988-05不同年龄小鼠缺血性心力衰竭后*心室重塑程度的比较△沈鑫,马依彤,杨毅宁,刘芬,于子翔,陈邦党,陈铀,黄莺(新疆医科大学第一附属医院冠心病一科,新疆乌鲁木齐830054)[摘要]目的:研究不同年龄小鼠缺血性心衰后心室重塑程度的变化。方法:选择3月龄和18月龄的雄性C57BL/6J小鼠共100只,每个月龄组50只,在
2、2组中分别随机选取40只,结扎左冠状动脉定量控制心梗面积,建立稳定缺血性心衰模型,每组其余10只作为假手术组,于术后8周行心脏超声评价各组心功能变化;称量全心脏及左心室重量并计算左心室质量指数(LVMI);免疫组化检测心肌Ⅰ、Ⅲ型胶原表达,Masson染色检测心肌纤维化的程度并计算心肌间质胶原分数(CVF)。结果:与低龄组相比,老龄组心脏破裂率(18%vs10%)和心力衰竭死亡率(22%vs10%)均高于低龄组(P<0.05);老龄组心室腔明显增大,心率较快,左室短轴收缩功能障碍更明显(P<0.
3、05);老龄组LVMI明显增加(P<0.05);老龄组CVF、Ⅰ型胶原的表达以及Ⅰ/Ⅲ型胶原的比值显著高于低龄组(P<0.05)。结论:老龄小鼠缺血性心衰后心肌胶原分布异常,心室重塑程度更重,心功能降低更明显。[关键词]心力衰竭;心室重塑;年龄;胶原[中图分类号]R541.4[文献标志码]Adoi:10.3969/j.issn.1000-4718.2013.06.005Effectsofdifferentagesonventricularremodelingafterischemicheartf
4、ailureinmiceSHENXin,MAYi-tong,YANGYi-ning,LIUFen,YUZi-xiang,CHENBang-dang,CHENYou,HUANGYing(FirstDepartmentofCoronaryHeartDisease,theFirstAffiliatedHospitalofXinjiangMedicalUniversity,Urumqi830054,China.E-mail:myt-xj@163.com)[ABSTRACT]AIM:Toobserveve
5、ntricularremodelinginducedbyischemicheartfailureinthemiceatdifferentages.METHODS:Three-month-old(younggroup,n=50)and18-month-old(oldgroup,n=50)maleC57BL/6Jmicewereselectedinthestudy.Fortymiceunderwentligationofleftcoronaryarterywithcertaininfarctsize
6、,and10weresham-operatedforcontrol.Echocardiographywasperformedafter8weeksofinfarction.Allmicewerekilledandtheheartswerecollectedforexaminations.Massontrichromestainingwasusedtodetectmyocardialfibrosis.TheexpressionoftypeIandtypeⅢcollagenswasmeasuredb
7、ythemethodofimmunohistochemistry.RESULTS:Theincidencesofcardiacrupture(18%vs10%,P<0.05)andheartfailure(22%vs10%,P<0.05)weresignificantlyhigherinagedmicethanthoseinyoungmice.Thedegreesofleftventriculardilation,contractiledysfunctionandheartrateweresig
8、nificantlyhigherinagedmicethanthoseinyoungmice(P<0.05).Theleftventricularmassindex,collagenvolumefraction,theexpressionoftypeIcollagenandratiooftypeⅠ/Ⅲcollagensweresignificantlyincreasedinagedmiceascomparedwithyoungmice(P<0.05).CONCLUSION:Afterheartf
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