脑心通对氧化低密度脂蛋白诱导血管平滑肌细胞增殖和自噬的影响

目的：观察脑心通对氧化低密度脂蛋白（ox-LDL）诱导血管平滑肌细胞（VSMC）增殖和自噬相关蛋白Beclin1、LC3表达的影响，探讨其抗动脉粥样硬化（AS）的可能机制。方法：将人脐动脉VSMC分为：对照组、ox-LDL组、脑心通组、ox-LDL+脑心通组。采用噻唑蓝（MTT）法和克隆形成实验检测细胞增殖作用，Western blot法检测自噬相关蛋白Beclin1与LC3表达水平的改变。结果：ox-LDL显著促进VSMC的增殖和克隆形成，而脑心通对VSMC的增殖和克隆形成无明显作用，但其抑制ox-LDL对VSMC增殖和克隆形成的促进作用。Western blot结果显示ox-LDL显著增加VSMC自噬相关蛋白Beclin1和LC3的表达水平；脑心通抑制ox-LDL增加的Beclin1和LC3的表达。MTT法检测发现自噬抑制剂3MA抑制ox-LDL对VSMC的增殖作用。结论：脑心通可能通过降低VSMC自噬抑制ox-LDL对VSMC的增殖作用。

The effects of naoxintong on vascular smooth muscle cells proliferation and autophagy induced by oxidized low-density lipoprotein

Objective: To investigate the effects of naoxintong on the vascular smooth muscle cells (VSMC) proliferation and the expression of Beclin1 and LC3 induced by oxidized low-density lipoprotein (ox-LDL). Methods: The VSMC were divided into four groups: control group, ox-LDL group, naoxintong group and ox-LDL+naoxintong group. MTT and colony formation assay was used to test the proliferation. Western blot was used to analysis the expression of Beclin1 and LC3. Results: ox-LDL significantly promoted the viability and colony formation of VSMC. Naoxintong had no effect on the proliferation and colony formation but inhibited the proliferation and colony formation of VSMC induced by ox-LDL. Western blot results demonstrated that ox-LDL significantly promoted the expression of Becli1 and LC3, naoxintong inhibited the expression of Beclin1 and LC3 induced by ox-LDL. Furthermore, MTT verified that autophagy inhibitors 3MA inhibited significantly the proliferation induced by ox-LDL. Conclusion: Naoxintong inhibited the VSMC proliferation induced by ox-LDL through inhibited the cell autophagy.