脂联素对钙化大鼠血管组织的影响

Influence of adiponectin on vascular calcification in rats

目的观察脂联素及其受体在钙化大鼠血管组织中的变化,探讨脂联素(adiponectin,APN)对钙化组织的作用。方法大鼠随机分为正常对照组、钙化组和脂联素组。制备大鼠血管钙化模型。用ELISA法测定血浆和血管组织中脂联素的含量,用real-time PCR方法检测组织中脂联素与其受体adipo R1的mRNA水平,用Western blot方法检测组织中受体adipo R1蛋白含量,测定血管中钙含量及碱性磷酸酶活性。结果与对照组相比,钙化大鼠血浆和血管组织中脂联素的含量明显降低,分别降低了47.1%和57.1%;钙化组大鼠血管组织中APN和adipo R1 mRNA水平较对照组有显著降低,分别降低了65.0%和72.0%;钙化大鼠的血管组织中adipo R1蛋白降低了77.2%(均P<0.01)。给予脂联素的大鼠血管组织中钙含量和碱性磷酸酶活性分别降低68.5%和34.8%(P<0.01)。结论钙化的血管组织中APN与其受体adipoR1系统是明显下调,APN可明显抑制钙化大鼠血管组织中钙含量和碱性磷酸酶的活性,提示APN可抑制维生素D3和尼古丁引起的血管钙化。

Objective To observe the changes of adiponectin and its receptors in vascular calcification,and the role of adiponectin on calcified tissues. Methods Male SD rats were induced vascular calcification by vitamin D3 and nicotine,with or without adiponectin. Calcium and alkaline phosphatase（ ALP） were assayed. The levels of APN in plasma and vascules were measured by ELISA. The mRNA levels of APN and adipo R1 were detected by using real-time PCR,the level of adipo R1 protein was detected by Western blotting. Results Compared with control group,the APN concentrations in plasma and calcified blood vessels decreased by47. 1% and 57. 1%,respectively. The mRNA levels of APN and adipo R1 decreased by 65. 0% and 72. 0%. The adipo R1 protein decreased by 77. 2%（ P〈0. 01）. 6. 55 fold increase calcium and 83. 4% increase in ALP activity were observed in calcified blood vessels than that in control group,while APN treatment down-regulated the calcium and ALP activity by 68. 5% and 34. 8%（ P〈0. 01）.Conclusions In calcified blood vessels,the APN and adipo R1 system are down-regulated,and APN decreases the calcium and ALP activity,suggesting that APN may have cardiovascular protection by antagonizing calcification.