Hemodynamics alter arterial low-density lipoprotein metabolism.

Hemodynamics alter arterial low-density lipoprotein metabolism.
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血流动力学改变动脉低密度脂蛋白代谢。

DOI:
10.1067/mva.1989.13732
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发表时间:
1989
影响因子:
4.3
通讯作者:
Borovetz,HS
Borovetz,HS
中科院分区:
医学2区
文献类型:
--
作者:
Warty,VS;Calvo,WJ;Berceli,SA;Pham,SM;Durham,SJ;Tanksale,SK;Klein,EC;Herman,IM;Borovetz,HS

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我们研究了血流动力学因素对完整动脉壁低密度脂蛋白转运和代谢的作用。将新鲜切除的犬颈动脉血管暴露于体外明确的脉动流中,持续时间长达20小时。我们选择在我们的测试颈动脉上施加以下血液动力学条件:正常血压、高血压(在生理流动条件下)和高血压伴犬血清灌注液流量升高。在几个实验中,内皮剥脱的影响进行了检查,在颈动脉暴露于正常血压脉动流。采用捕获配体法定量测定动脉壁低密度脂蛋白的摄取和代谢。完整的和降解的低密度脂蛋白组分的分布测定的放射性标记的低密度脂蛋白活性内薄径向切片灌注动脉。我们的研究结果表明,这两种高血压血流动力学模拟加剧了动脉壁内低密度脂蛋白的摄取(3至9倍)。经历不可逆降解的低密度脂蛋白的百分比从正常血压条件下的41%福尔斯到施加高血压条件时的30%以下,表明降解过程不随加速流入而成比例地升高。对于去内皮化的血管观察到类似的模式。(J Vasc Surg1989;10:392-9.)
We have investigated the role of hemodynamic factors on low-density lipoprotein transport and metabolism in the intact arterial wall. Freshly excised canine carotid blood vessels were exposed to well-defined pulsatile flow in vitro for continuous periods up to 20 hours. We chose to impose the following hemodynamic conditions on our test carotid arteries: normotension, hypertension (at physiologic flow conditions), and hypertension coupled with elevated flow of canine serum perfusate. In several experiments the effect of endothelial denudation was examined in carotid arteries exposed to normotensive pulsatile flow. A trapped ligand method was used for quantitating low-density lipoprotein uptake and metabolism in the arterial wall. The distribution of both intact and degraded low-density lipoprotein fractions was determined from measurements of radiolabelled low-density lipoprotein activity within thin radial sections of perfused arteries. Our results suggest that both hypertensive hemodynamic simulations exacerbate the uptake of low-density lipoprotein within the arterial wall (by a factor of three to nine). The percentage of low-density lipoprotein that undergoes irreversible degradation falls from 41% under normotensive conditions to below 30% when hypertensive conditions are imposed, indicating that degradative processes are not proportionally elevated with the accelerated influx. A similar pattern is observed for deendothelialized vessels. (J Vasc Surg1989;10:392–9.)
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