Losartan对神经肽Y诱导血管平滑肌

目的:观察神经肽Y(NPY)与血管紧张素受体拮抗剂losartan对体外培养的血管平滑肌细胞(VSMC)中PCNA、PDGF、c-myc癌基因表达的影响,从分子生物学的角度探讨NPY在高血压、动脉粥样硬化发生中的作用和losartan的逆转作用。方法:应用荧光免疫组化定量技术(ACAS570共聚焦激光扫描显微细胞仪)。结果:NPY刺激VSMC增殖,使其PCNA、PDGF和c-myc癌基因的表达明显高于对照组;losartan则可逆转NPY对VSMC增殖的刺激作用,使PCNA、PDGF和c-myc癌基因表达的平均荧光值降低。结论:NPY促进VSMC的增殖,其作用与高血压的发生有关;而losartan对高血压的治疗作用可能与拮抗NPY对VSMC增殖的刺激作用有关。

The stimulating effects of neuropeptide Y on cultured arterial smooth muscle cell proliferation and losartan treatment

AIM: To observe expression of proliferating cell nuclear antigen (PCNA), platelet derived growth factor (PDGF) and c-myc in cultured vascular smooth muscle cells which is effected by neuropeptide Y (NPY) and losartan (the receptor blocking agent of angiotensin Ⅱ) therefore exploring effects of NPY on the generation of hypertension and its relationship with losartan reverse treatment in molecular biology. METHODS: Applied the method of quantitative immunocytochemistry through ACAS570. RESULTS: 24 hours exposure of vascular smooth muscle cell to NPY caused an increase in expression of PCNA, PDGF and c-myc respectively. But losartan could reverse these expressions by NPY, decreased the expression of PCNA, PDGF and c-myc.CONCLUSION: NPY is closely related to the generation hypertension. But losartan could reverse these effects of NPR.