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首页> 外文期刊>Hypertension: An Official Journal of the American Heart Association >Effects of melatonin and Pycnogenol on small artery structure and function in spontaneously hypertensive rats.
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Effects of melatonin and Pycnogenol on small artery structure and function in spontaneously hypertensive rats.

机译:褪黑素和碧萝ogen对自发性高血压大鼠小动脉结构和功能的影响。

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摘要

It was suggested that oxidative stress has a key role in the development of endothelial dysfunction, as well as microvascular structural alterations. Therefore, we have investigated 2 substances with antioxidant properties: melatonin and Pycnogenol. We treated 7 spontaneously hypertensive rats (SHRs) with melatonin and 7 with Pycnogenol for 6 weeks. We compared results obtained with those observed in 7 SHRs and 7 Wistar-Kyoto normotensive control rats kept untreated. Mesenteric small resistance arteries were dissected and mounted on a wire myograph, and a concentration-response curve to acetylcholine was performed. Aortic contents of metalloproteinase 2, Bax, inducible NO synthase, and cyclooxygenase 2 were evaluated, together with the aortic content of total collagen and collagen subtypes and apoptosis rate. A small reduction in systolic blood pressure was observed. A significant improvement in mesenteric small resistance artery structure and endothelial function was observed in rats treated with Pycnogenol and melatonin. Total aortic collagen content was significantly greater in untreated SHRs compared with Wistar-Kyoto control rats, whereas a full normalization was observed in treated rats. Apoptosis rate was increased in the aortas of untreated SHRs compared with Wistar-Kyoto control rats; an even more pronounced increase was observed in treated rats. Bax and metalloproteinase 2 expressions changed accordingly. Cyclooxygenase 2 and inducible NO synthase were more expressed in the aortas of untreated SHRs compared with Wistar-Kyoto control rats; this pattern was normalized by both treatments. In conclusion, our data suggest that treatment with Pycnogenol and melatonin may protect the vasculature, partly independent of blood pressure reduction, probably through their antioxidant effects.
机译:有人提出,氧化应激在内皮功能障碍以及微血管结构改变的发展中起着关键作用。因此,我们研究了两种具有抗氧化性能的物质:褪黑激素和碧萝ogen。我们用褪黑素治疗了7例自发性高血压大鼠(SHRs),用碧容健治疗了7例,持续了6周。我们将获得的结果与7只SHR和7只未经治疗的Wistar-Kyoto血压正常对照大鼠中观察到的结果进行了比较。切开肠系膜小阻力动脉并将其安装在钢丝肌电图仪上,并绘制对乙酰胆碱的浓度-响应曲线。评估了金属蛋白酶2,Bax,诱导型NO合酶和环氧合酶2的主动脉含量,以及总胶原和胶原亚型的主动脉含量以及细胞凋亡率。观察到收缩压略有下降。在用碧容健和褪黑激素治疗的大鼠中,观察到肠系膜小阻力动脉结构和内皮功能的显着改善。与Wistar-Kyoto对照大鼠相比,未治疗的SHR中的总主动脉胶原含量明显更高,而在治疗的大鼠中观察到完全正常化。与Wistar-Kyoto对照大鼠相比,未经处理的SHRs的主动脉凋亡率增加。在治疗的大鼠中观察到甚至更明显的增加。 Bax和金属蛋白酶2的表达发生了相应的变化。与Wistar-Kyoto对照大鼠相比,未经处理的SHRs的主动脉中环氧合酶2和诱导型NO合酶的表达更高。两种治疗均使该模式正常化。总之,我们的数据表明,碧萝ogen和褪黑激素的治疗​​可能保护了脉管系统,部分与降压无关,可能是由于它们的抗氧化作用。

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