养血清脑血清拮抗溶血磷脂酸诱导大鼠血管平滑肌细胞增殖

目的:观察养血清脑药物血清对溶血磷脂酸(LPA)诱导的大鼠血管平滑细胞(VSMC)增殖作用的影响。方法:在培养的大鼠平滑肌细胞上,测定³H]-胸腺嘧啶核苷(³H]-thymidine,³H]-TdR)掺入、丝裂素活化蛋白激酶(mitogen-activated protein kinase,MAPK)活性及脂质过氧化终产物丙二醛(malonyldialdehyde,MDA)含量。结果:1×10^－9、1×10^－8和1×10^－7 mol·L^-1 LPA呈浓度依赖性引起VSMC³H]-TdR掺入量、MAPK活性及MDA含量增加。5％、10％和15％养血清脑血清预孵育使1×10^－7 mol·L^-1 LPA诱导VSMC³H]-TdR掺入量分别下降23.0％、42.0％和52.0％(P<0.01);使VSMC MAPK的活性分别下降13.9％(P<0.05)、29.6％(P<0.01)和48.9％(P<0.01);使细胞MDA含量分别下降19.4％、24.7％和43.2％(P<0.01)。结论:LPA呈浓度依赖性引起VSMC增殖及脂质过氧化,VSMC增殖与其细胞内信号转导MAPK途径有关。养血清脑血清可有效地拮抗LPA诱导的VSMC增殖、MAPK激活和脂质过氧化损伤。

Yangxue qingnao- containing serum inhibits rat vascular smooth muscle cell proliferation induced by lysophosphatidic acid

AIM: To observe the effects of Yangxue qingnao-containing serum on rat vascular smooth muscle cell (VSMC) proliferation induced by lysophosphatidic acid (LPA). METHODS: The ³H]-TdR incorporation and mitogen-activated protein kinasc (MAPK) activity were measured in cultured VSMC. End product of lipid peroxidation-MDA levels were also detected. RESULTS: 1×10^－9,1×10^－8 and 1×10^－7 mol/L LPA enhanced the cultured VSMC ³H]-TdR incorporation, increased MAPK activity and MDA content in a concentration-dependent manner. 5％, 10％ and 15％ Yangxue qingnao-containing serum concentration-dependently inhibited the increase in VSMC ³H]-TdR incorporation, MAPK activity and MDA content induced by LPA. CONCLUSIONS: LPA has a stimulating effect on VSMC proliferation. The LPA-induced intracellular signal transduction may be related to MAPK activity. Yangxue-qingnao can efficiently inhibit LPA -induced VSMC proliferation,MAPK activity and lipid peroxidation.