粒细胞-巨噬细胞集落刺激因子对大鼠急性心肌损伤血管新生的作用

目的 观察粒细胞-巨噬细胞集落刺激因子(GM-CSF)预处理对异丙肾上腺素(Iso)所致大鼠急性心肌损伤后新生血管密度的影响.方法 雄性、成年Wistar大鼠60只,体质量约190 g.按体质量将大鼠随机分成3组:对照组,GM-CSF预处理组(GM-CSF组),Iso损伤组,每组20只.GM-CSF组提前给予注射用人重组(rh)GM-CSF 5.0μg/kg,1次/d,尾静脉注射,连续3 d.在注射后的第3天,GM-CSF组和Iso损伤组同时给予Iso,按15.0 mg/kg腹腔注射,1次/d,连续3 d;对照组给予等量次生理盐水.注射后第10天.观察各组大鼠心肌损伤的病理改变和坏死灶面积;免疫组化方法测量、等大鼠心肌组织中新生血管密度指数:RT-PCR法检测大鼠心肌组织中多肽抗原(CD34)、血管内皮生长因子(VEGF)及VEGF受体(KDR/flk-1)的表达.结果 大鼠心肌坏死面积组问比较差异有统计学意义(F=10.07,P<0.01),其中GM-CSF组[(37.37 ±12.98)%]明显少于Iso损伤组[(45.51±14.96)%,P<0.05].大鼠心肌组织中新生血管密度指数组间比较差异有统计学意义(F=25.54,P<0.05),其中GM-CSF组[(3980.05±477.22)个/mm2]显著高于Iso损伤组[(2605.93 ±361.49)个/mm2,P<0.01].大鼠心肌CD34、VEGF、KDR/flk-1 mRNA表达组间比较差异有统计学意义(F值分别为17.83、4.29、4.10,P均<0.01);GM-CSF组[CD34(44.04±10.13).VEGF(49.40±11.59),KDR/flk-1(46.49 ±7.90)]均高于Iso损伤组[CD34(23.85±6.06),VEGF(31.80±8.05),KDR/flk-1(30.16±8.01).P均<0.01].大鼠心肌VEGF mRNA表达与其受体KDR/flk-1 mRNA表达呈正相关(r=0.725,R2=0.526,P<0.01).结论 GM-CSF预处理可增加大鼠心肌中新生血管密度.减轻Iso所致的大鼠心肌损伤.

Abstract：

Objective To study the effect of granulocyte-macrophage colony-stimulating factor(GM-CSF)on angiogenesis of rat with acute myocardial injury induced by isoproterenol(Iso). Methods A total of 60 adult male Wistar rats were randomly divided into 3 groups: normal control group, GM-CSF pretreatment group (GM-CSF group), and lso injury group, 20 rats in each group. GM-CSF group was administered recombinant human(rh)GM-CSF(5.0 μg/kg), through tail intravenous injection once a day for three days. Then the GM-CSF group and the Iso injury group were anesthetized by intraperitoneal injection of lso( 15.0 mg/kg) once a day for three days. The same dose of saline was administered in the same way to the control rats. Ten days after injection, pathological changes of myocardial damage and infarct area were examined by immunohistochemistry. The mRNA expression levels of polypeptide antigen (CD34), vascular endothelial growth factor (VEGF) and its receptor KDR/flk- 1 were measured by RT-PCR. Results The difference of myocardial necrosis area between groups was statistically significant(F=10.07, P < 0.01), in which GM-CSF group[(37.37 ± 12.98)%] was significantly less than Iso injury group[(45.51 ±14.96)%, P < 0.05]. The difference of myocardial neovascularization density index of rats between groups was statistically significant ( F = 25.54, P < 0.05 ), in which GM-CSF group [(3980.05 ± 477.22) No/mm2] was significantly higher than Iso injury group((2605.93±361.49)No/mm2,P<0.01).The differences of myocardial CD34,VEGF,KDR/flk-1 mRNA expression between groups were statistically significant(F=17.83,4.29,4.10,all P<0.01).Compared to Iso mjury group[CD34(23.85±6.06),VEGF(31.80±8.05),KDR/flk-1(30.16±8.01)]were higher in the GM-CSF group[CD34(44.04±10.13),VEGF(49A±11.59),and KDR/flk-1(46A9±7.90),all P<0.01].The expressions of myocardiM VEGF mRNA and its receptor KDR/flk-1 mRNA was positively correlated(r=0.725,R2=0.526,P<0.01).Conclusions GM-CSF prelreatmcnt increases the density ofnew blood vessels in myocardium,and reduces the Iso-induced myocardial injury in rats.

Role of granulocyte-macrophage colony-stimulating factor in promoting angiogenesis of rat with acute myocardial injury

Objective To study the effect of granulocyte-macrophage colony-stimulating factor(GM-CSF)on angiogenesis of rat with acute myocardial injury induced by isoproterenol(Iso). Methods A total of 60 adult male Wistar rats were randomly divided into 3 groups: normal control group, GM-CSF pretreatment group (GM-CSF group), and lso injury group, 20 rats in each group. GM-CSF group was administered recombinant human(rh)GM-CSF(5.0 μg/kg), through tail intravenous injection once a day for three days. Then the GM-CSF group and the Iso injury group were anesthetized by intraperitoneal injection of lso( 15.0 mg/kg) once a day for three days. The same dose of saline was administered in the same way to the control rats. Ten days after injection, pathological changes of myocardial damage and infarct area were examined by immunohistochemistry. The mRNA expression levels of polypeptide antigen (CD34), vascular endothelial growth factor (VEGF) and its receptor KDR/flk- 1 were measured by RT-PCR. Results The difference of myocardial necrosis area between groups was statistically significant(F=10.07, P < 0.01), in which GM-CSF group[(37.37 ± 12.98)%] was significantly less than Iso injury group[(45.51 ±14.96)%, P < 0.05]. The difference of myocardial neovascularization density index of rats between groups was statistically significant ( F = 25.54, P < 0.05 ), in which GM-CSF group [(3980.05 ± 477.22) No/mm2] was significantly higher than Iso injury group((2605.93±361.49)No/mm2,P<0.01).The differences of myocardial CD34,VEGF,KDR/flk-1 mRNA expression between groups were statistically significant(F=17.83,4.29,4.10,all P<0.01).Compared to Iso mjury group[CD34(23.85±6.06),VEGF(31.80±8.05),KDR/flk-1(30.16±8.01)]were higher in the GM-CSF group[CD34(44.04±10.13),VEGF(49A±11.59),and KDR/flk-1(46A9±7.90),all P<0.01].The expressions of myocardiM VEGF mRNA and its receptor KDR/flk-1 mRNA was positively correlated(r=0.725,R2=0.526,P<0.01).Conclusions GM-CSF prelreatmcnt increases the density ofnew blood vessels in myocardium,and reduces the Iso-induced myocardial injury in rats.