大鼠心肌缺氧缺血再灌注损伤及心肌重塑的相关研究

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中华妇幼临床医学杂志(电子版)2009年2月第5卷第1期Chin J Obs/Gyne&Pediatr(Electronic Edition),Febuary 2009,Vo1.5,No.1 ・21・ 

大鼠心肌缺氧缺血再灌注损伤及 

心肌重塑的相关研究 

徐书珍 王彩霞 赵炜 初建芳 

【摘要】 目的 观察窒息大鼠心肌缺氧缺血再灌注损伤后,心肌组织基质金属蛋白酶(matrix metal1oproteinases,MMPs)、转化生长因子一p1(transforming growth factor—p1,TGF—p1)的表达与损伤修复 及窒息后心肌重塑的相关性。方法模拟大鼠常压窒息模型,制作缺氧缺血再灌注损伤大鼠动物模型。将 6O只7 d--10 d Wistar鼠,随机分成窒息组(n一45)和对照组(D组,n一15,不窒息处理)。窒息组根据窒息 后复氧时间不同分为A,B,C组(分别为复氧后1 d,7 d,14 d),每组各15只。快速定量检测血清心肌肌钙 蛋白I(cardiac troponin I,cTn I),Masson染色测定胶原组织容积测算(collagen volume fraction,CVF), 同时利用HE染色观察心肌组织病理学改变,免疫组化法测定心肌组织基质金属蛋白酶一3,一9的活性;免疫 组化法进行定性及半定量分析心肌转化生长因子一81的表达。结果 血清心肌肌钙蛋白I呈一过性增高, A组明显高于D组(P%0.01);B,C组下降,与D组比较,差异无显著意义(P>O.05)。心肌组织基质金属 蛋白酶一3活性呈驼峰样增高,与D组比较,A,B,C组均升高,以B组升高最显著(P<0.05)。基质金属蛋 白酶9活性A,B,C组呈逐渐升高趋势,与D组比较,差异有显著意义(P<0.05)。窒息后,A,B,C组胶原 组织容积测算值逐渐升高,A组与D组比较,差异无显著意义(P>O.05);B,C组与D组比较,差异有显著 意义(P<O.O1),且c组最高。A,B,c组转化生长因子一B 表达,随窒息时间延长而升高明显,A组与D组 比较,差异无显著意义(P>0.05);B,C组与D组比较,差异有显著意义(P<0.01)。胶原组织容积与转化 生长因子~8 表达呈正相关(r一0.574,P<0.O1);基质金属蛋白酶一3,一9与胶原组织容积呈正相关(r一 0.482,0.679;P<0.05)。结论新生鼠窒息后造成缺氧缺血再灌注损伤,心肌组织基质金属蛋白酶一3,一9 激活,转化生长因子一p 表达增强,继发胶原组织容积增高。基质金属蛋白酶一3,一9与转化生长因子一8 ,可 能参与心肌与缺氧缺血再灌注损伤的自我修复损伤后心肌重塑。 【关键词】基质金属蛋白酶; 转化生长因子一8 ; 心肌胶原容积; 心肌重塑; 再灌注损伤 

Correlation Study Between the Myocardial Anoxia lschemia Reperfusion Injury and Myocardium Remodeling in Asphyxiated Newborn Rats. XUShu—zhen,WANG Cai—xia,ZHAO Wei,CHUJian—fang.Department of Pediatrics,Qingdao Municipal Hospital,Qingdao 26601 1,China.(C0rrPs 0 g author:XU Shu— zhen,Email:xushuzhenO01@163.COTrZ) 【Abstract] Objective To observe the expression of matrix metalloproteinases(MMPs)and transforming growth factor—G1(TGF-I;1)and their effectiveness on myocardial repairing and remodeling after anoxia ischemia reperfusion injury in rats.Methods The anoxia ischemia reperfusion injury animal model was set up in this study.Sixty Wistar rats were randomly divided into 4 groups:the group A,B,C(at the first day,the seventh day and the fourteenth day after the myocardial anoxia ischemia reperfusion injury) and the control group(without any asphyxia treatment)(1 5 rats for each group).The blood serum cardiac troponin I(cTn I)was measured by the rapid quantifying.Masson staining was used to study the collagen volume fraction(CVF),and myocardial histopathological integration was tested by the HE staining.The myocardial matrix meta11oproteinase 3,9 activities was measured by the immunohistochemical assay, and the transforming growth factor—pl expression of myocardium were measured by the immunohistochemistry assay and semiquantitative analysis.Results Serum cardiac troponin I provisionality raised,the level of the group A were obviously higher than those of the control group(P<O.01),but the level of the group B and C declined(P>O.05);matrix metalloproteinase-3 activity in the group A,B and C were significantly higher than those of the control group,reaching a peak on the group B(P<0.05).The meta1loproteinase一9 activity in the group A,B and C were significantly higher than those of the control group(P<0.05). Collegen volume fractions were gradually increased after asphyxia(P>O.05,P<O.05,P<0.05, 

作者单位:266011青岛,青岛市市立医院小儿科 通讯作者徐书珍(Email:xushuzhen001@163.corn) ・论著・

 中华妇幼临床医学杂志(电子版)2009年2月第5卷第1期Chin J Obs/(;yne&Pediatr(Eleetronic Fxtition),Febuary 2009,Vo1.5,No.1 

respectively)and the group C reached the highest leve1.The expression of transforming growth factor一81 enhanced by the change of the time(P ̄0.05,P<O.O1,P<O.01,respectively).Collegen VO1Ume fractions were positively correlated with transforming growth factor—B1(r=0.574,P<0.01).Matrix metal1oproteinase一3,一9 activities positively correlated with collegen volume fractions(r一0.482,0.679; P<O.05).Conclusion There has anoxia ischemia reperfusion injury in rats myocardium.After the asphyxia,the matrix metalloproteinase 3, 一9 activities are activited and the expression of transforming growth factor- ̄l are enhanced,myocardial collagens increase. Matrix meta1loproteinase一3,9,transforming growth factor—pl may relate with the myocardial remodeling after the anoxia ischemia reperfusion inj ury. [Key words] matrix metalloproteinases(MMPs);transforming growth factor—G1(TGF- ̄1); collagen volume fraction(CVF); myocardial remodeling; reperfusion injury 

新生儿窒息是围生期新生儿死亡的主要原因之 

一。新生儿窒息后组织器官血流灌注不足导致低氧血 

症,使葡萄糖有氧代谢转为无氧酵解,j三磷酸腺苷 (adenosine—triphosphate,ATP)产生锐减,细胞膜离 

子泵产生功能障碍,Na。。,Ca 大量内流,造成细胞水 肿、坏死。缺氧缺血还可导致细胞凋亡 。当窒息给 

氧复苏时,血管痉挛解除发生再灌注,氧自由基生成进 

一步增多,微血管病变导致中性粒细胞聚集、炎性介质 (肿瘤坏死因子、白介素和血小板活化因子等)释放,使 

心肌细胞损伤加重,导致缺氧缺血性损伤,最终导致心 

脏扩大、心力衰竭。自20世纪70年代提出缺血再灌 

注损伤(ischemic reperfusion injury,IRI)以来,IRI已 成为心血管医师的研究热点。IRI过程中,是否存在 

心肌问质重塑,国内外文献报道较少。本研究通过动 物实验研究窒息复苏过程中基质金属蛋白酶(matrix