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人参三七川芎提取物对增龄和高血压大鼠血管平滑肌细胞的影响

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近日,中国中医科学院医学实验中心研究人员发表论文,旨在观察和比较增龄与高血压对大鼠主动脉血管平滑肌细胞(vascular smooth muscle cells,VSMCs)的影响及人参三七川芎提取物的干预作用。

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研究指出,增龄和高血压均可造成大鼠主动脉VSMCs过度增殖及相关细胞活性因子的表达改变,中药人参、三七、川芎提取物能够降低其增殖水平,减少负性细胞因子的表达以降低增龄和高血压对VSMCs的损害,延缓血管细胞的老化。该文发表在2013年第10期《中国中西医结合杂志》上。

采用原代细胞培养的方法建立大鼠主动脉VSMCs模型,其中增龄实验分5组:青年对照组(Yon组)、老龄组(Old组)、老龄+普罗布考组(Old+Pro组)、老龄+中药低剂量组(Old+Low组)和老龄+中药高剂量组(Old+High组);高血压实验分5组:Wist-ar-Kyoto对照组(WKY组)、自发性高血压大鼠(spontaneously hypertensiverat,SHR)组、SHR+缬沙坦组(SHR+Val组)、SHR+中药低剂量组(SHR+Low组)和SHR+中药高剂量组(SHR+High组)。采用MTT法检测细胞增殖,免疫细胞化学法检测基质金属蛋白酶-9(MMP-9)表达,RT-PCR和Western blot分别检测过氧化物酶增殖物激活受体γ(peroxisome proliferator

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activated receptor-γ,PPAR-γ)mRNA和蛋白表达。

与Yon组比较,Old组VSMCs增殖水平和MMP-9表达升高,PPAR-γmRNA和蛋白表达减少,差异均有统计学意义(P<0.05)。与Old组比较,Old+Pro组、Old+High组和Old+Low组VSMCs增殖水平和MMP-9表达明显降低,PPAR-γmRNA表达明显增加(均P<0.05),Old+Pro组和Old+Low组PPAR-γ蛋白表达明显增加(均P<0.05)。与WKY组比较,SHR组VSMCs增殖水平和MMP-9表达明显升高,PPAR-γmRNA和蛋白表达明显减少(均P<0.05);与SHR组比较,SHR+Val组、SHR+High组和SHR+Low组VSMCs增殖水平和MMP-9表达明显降低,PPAR-γmRNA和蛋白表达增加(均P<0.05)。

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