降钙素基因相关肽对培养的血管内皮细胞缺氧再给氧的影响

目的:观察降钙素基因相关肽(CGRP)对培养的人脐静脉血管内皮细胞缺氧再给氧损伤的影响。方法:用培养的人脐静脉血管内皮细胞建立缺氧再给氧模型,观察血管内皮细胞在缺氧再给氧状态下台盼兰摄取率、细胞内乳酸脱氢酶(LDH)活性,钙、镁含量和丙二醛(MDA)含量的变化以及CGRP对培养的血管内皮细胞的影响。结果:1×10^-8mol/LCGRP可降低缺氧再给氧时血管内皮细胞的台盼兰摄取率、钙含量及MDA含量,降低LDH活性,减少细胞内镁的丢失。结论:CGRP对缺氧再给氧的血管内皮细胞具有直接保护作用,其作用可能与CGRP具有抗脂质过氧化,减轻细胞内钙超载以及减少镁与酶的丢失有关。

Effects of calcitonin generelated peptide on cultured human umbilical vein endothelial cells following anoxia andreoxygenation

In the present experiment, an anoxic-reoxygenation model wasestablished by using cultured human umbilical vein endothelial cells. The uptake rate of trypan-blue and calcium and magnesium contents of endothelial cells and lactic dehydrogenase (LDH) activity in medium and malondialdhyde (MDA) content of endothelial cells were measured 60,120 and 180 min after anoxia and 30 and 60 min after reoxygenation, and the effects of 1×10-8 mol／L CGRP on anoxic-reoxygenation endothelial cells were studied. RESULTS: The findings showed that, as anoxia prolonged, the uptake rate of trypan-blue and LDH activity and MDA content gradually elevated and, during reoxygenation, these parameters sharply increased. Calcium and magnesium levels gradually declined as anoxia prolonged, and during reoxygenation calcium content significantly increased. Meanwhile, 1×10-8 mol／L CGRP might significantly reduce the uptake rate of trypan-blue and LDH activity and MDA content during anoxia and reoxygenation and lessen the increase in calcium content and the loss of magnesium during reoxygenation. CONCLUSION: These results showed that CGRP might have a direct protective function to endothelial cells afflicted with anoxic-reoxygenation injury by inhibiting lipid peroxidation, attenuating calcium overload and loss of magnesium and enzyme.