低切应力作用下体外培养动脉内皮细胞内皮素的表达

研究了切应力对完整血管的生物学作用以及应力引起血管重建过程中内皮素(ET)的变化．采用血管体外应力培养系统，将一段完整的猪颈总动脉在体外进行培养，设切应力分别为2Pa(％组)和0．5Pa(S5组)，设置2、4、6．8．10．12、14．16和18h共9个时相观察点，非平衡法放射免疫检测灌流液中的ET含量．通过Logistic曲线方程拟合，分析切应力作用下完整动脉ET表达变化规律。结果显示：S20组ET总体变化不明显；S5组分泌速率在前12．37h内明显上升，而后又逐渐下降趋于稳定，且始终高于S20组。说明低切应力作用下ET的表达及分泌增高．结果提示，在低切应力引起的血管重建中，ET可能起着重要作用。

Expression of endothelin in organ-cultured artery under low shear stress

The biological effect of shear strees on intact artery and the change of Endothelin (ET) during the stress-induced vascular remodeling was studied. The common carotid arteries of pigs were cultured with a artery organ-culture system under different shear stress, 0.5 and 2 Pa respectively, 1.33×10-4 Pa of pressure and stable flow in vitro. Cultured for 2, 4, 6, 8, 10, 12, 14, 16 and 18 h, the content of ET in the perfusate was examined with radio-immunity method, and the data were described by Logistic equation. The secretion velocity of ET didn't change obviously in S20 group, while in S5 group it rised evidently at the first 12 h and then descend to a stable level which was higher than S20 group all the time. The secretion and expression of ET rised under low shear stress. It may play an important role in vascular remodeling induced by low shear stress.