首页> 外文期刊>Life sciences >Involvement of altered arginase activity, arginase I expression and NO production in accelerated intimal hyperplasia following cigarette smoke extract.
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Involvement of altered arginase activity, arginase I expression and NO production in accelerated intimal hyperplasia following cigarette smoke extract.

机译:香烟烟雾提取物后加速的内膜增生涉及改变的精氨酸酶活性,精氨酸酶I表达和NO的产生。

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In the present experiments, we tried to elucidate whether changes in arginase activity, protein expression of arginase-I and -II, and NO production are involved in accelerating the intimal hyperplasia following administration of cigarette smoke extract (CSE). The intimal hyperplasia was caused by removing endothelial cells with the aid of balloon embolectomy catheter in the right carotid artery of the male rabbit. The left carotid artery underwent sham operation and served as control. CSE was prepared by bubbling a stream of cigarette smoke into phosphate buffered saline. Rabbits were given subcutaneously with CSE once a day for 5 weeks from 1 week before to 4 weeks after the surgery. The specimens were assessed histologically and the intima/media ratio (%) was evaluated as an index of the intimal hyperplasia. The accelerated intimal hyperplasia with CSE was accompanied by the augmentation of the impaired cyclic GMP production, enhanced overall arginase activity and up-regulation of arginase-I. Pearson's correlation coefficient analyses revealed the close relationships among the arginase activities in endothelial cells and smooth muscle layer, the intimal/media ratio and cyclic GMP production. These results suggest that the enhanced arginase activity together with facilitated up-regulation of arginase-I with CSE, which was associated with the augmented impairment of NO production, shed a new light on the processes associated with accelerating the intimal hyperplasia in rabbit carotid arteries following CSE.
机译:在本实验中,我们试图阐明在服用香烟烟雾提取物(CSE)后内膜增生促进过程中是否涉及精氨酸酶活性的变化,精氨酸酶I和-II的蛋白表达以及NO的产生。内膜增生是通过在雄性兔的右颈动脉中通过球囊栓塞切除术导管去除内皮细胞引起的。左颈动脉进行假手术并作为对照。通过将卷烟烟气吹入磷酸盐缓冲盐水中来制备CSE。从手术前1周到手术后4周,每天一次给兔子皮下注射CSE,持续5周。对组织进行组织学评估,并将内膜/中膜比率(%)评估为内膜增生的指标。伴有CSE的内膜增生加速伴随着循环GMP产生受损,增强的总精氨酸酶活性和精氨酸酶I上调。 Pearson的相关系数分析揭示了内皮细胞和平滑肌层中精氨酸酶活性,内膜/中膜比和循环GMP产生之间的密切关系。这些结果表明,增强的精氨酸酶活性以及CSE促进的精氨酸酶I的上调,这与NO产生的损伤增加有关,为加速兔颈动脉内膜增生后的相关过程提供了新的思路。 CSE。

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