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本实验采用酶联免疫分析法检测猪主动脉内皮细胞培养液中ｔＰＡ抗原、ｔＰＡ活性和ＰＡＩ活性，并观察了ＬＤＬ和Ｌ精氨酸对ｔＰＡ和ＰＡＩ的影响。结果表明：ＬＤＬ能明显降低ｔＰＡ抗原含量。同时伴有ｔＰＡ活性的降低和ＰＡＩ活性增高；Ｌ精氨酸能增加ｔＰＡ抗原含量伴ｔＰＡ活性增高，但对ＰＡＩ活性无明显影响。实验提示Ｌ精氨酸能保护血管内皮细胞，增加其ｔＰＡ合成，并能部分地拮抗ＬＤＬ降低ｔＰＡ合成的作用，可能对动脉粥样硬化早期防治有重要应用价值。
In this experiment, enzyme-linked immunosorbent assay was used to detect t-PA antigen, t-PA activity and PAI activity in porcine aortic endothelial cell culture medium and the effects of LDL and L-arginine on t-PA and PAI were observed. The results showed that: LDL can significantly reduce t PA antigen content. Accompanied by decreased activity of PA and PA PAI activity increased; L arginine can increase t PA antigen content with PA activity increased, but no significant effect on PAI activity. Experimental results suggest that L-arginine can protect vascular endothelial cells, increase their t PA synthesis and LDL can be partially antagonized the role of reducing t PA synthesis may have an important value in the early prevention and treatment of atherosclerosis.