首页> 外文期刊>American Journal of Physiology >Thrombin increases permeability only in venules exposed to inflammatory conditions.
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Thrombin increases permeability only in venules exposed to inflammatory conditions.

机译:凝血酶仅在暴露于炎性疾病的小静脉中增加通透性。

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Thrombin is widely used to stimulate a variety of responses in cultured endothelial cell monolayers as a model of acute vascular endothelial response to inflammatory mediators. However, preliminary results indicated that rat mesenteric venules did not respond acutely to thrombin. We tested the hypothesis that rat venules would respond to thrombin 24 h after prior injury by microperfusion. Vessel responsiveness was measured as hydraulic conductivity (Lp). When venules were exposed to rat thrombin (10 U/ml) within 2 h of initial perfusion with vehicle control, there was no increase in Lp of any vessel from a mean baseline of 1.2 +/- 0.2 x 10(-7) cm.s-1.cmH2O-1. In contrast, when perfused with thrombin at 25-27 h after initial perfusion, every venule responded to thrombin with a transient increase in Lp. The mean peak Lp on day 2 in response to thrombin was 24 +/- 4.2 x 10(-7) cm.s-1.cmH2O-1. Our results suggest that prior endothelial injury modifies the endothelial cell phenotype and alters the response of endothelial cells to thrombin after 24 h. Phenotypic plasticity of endothelial cells may play a key role in the regulation of permeability of some endothelial cells in culture and in intact venules, where localized leaky sites may form where there had been a previous inflammatory response.
机译:凝血酶被广泛用于刺激培养的内皮细胞单层中的多种反应,作为对炎症介质的急性血管内皮反应的模型。但是,初步结果表明,大鼠肠系膜小静脉对凝血酶没有急性反应。我们检验了以下假设:大鼠微静脉在先损伤后2​​4小时会因微灌注对凝血酶产生反应。测得的容器响应度为水力传导率(Lp)。当在用媒介物对照进行初始灌注的2小时内,将小静脉暴露于大鼠凝血酶(10 U / ml)时,任何血管的Lp均未从平均基线1.2 +/- 0.2 x 10(-7)cm升高。 s-1.cmH2O-1。相反,在初次灌注后25-27 h灌注凝血酶时,每个小静脉对凝血酶的反应都是Lp的短暂升高。在第2天,对凝血酶的平均峰值Lp为24 +/- 4.2 x 10(-7)cm.s-1.cmH2O-1。我们的结果表明,先前的内皮损伤会改变内皮细胞表型,并在24小时后改变内皮细胞对凝血酶的反应。内皮细胞的表型可塑性可能在调节培养物中和完整小静脉中某些内皮细胞通透性的过程中起关键作用,在这些小静脉中可能在先前有炎症反应的地方形成局部渗漏部位。

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