Involvement of Akt and endothelial nitric oxide synthase in ventilation-induced neutrophil infiltration: a prospective, controlled animal experiment.

Involvement of Akt and endothelial nitric oxide synthase in ventilation-induced neutrophil infiltration: a prospective, controlled animal experiment.
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DOI:
10.1186/cc6101
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发表时间:
2007
期刊:
Critical care (London, England)
影响因子:
--
通讯作者:
Quinn DA
Quinn DA
中科院分区:
其他
文献类型:
--
作者:
Li LF;Liao SK;Lee CH;Huang CC;Quinn DA

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大潮气量的正压通气已被证明会导致细胞因子的释放,包括巨噬细胞炎症蛋白 2 (MIP-2)(相当于人类 IL-8 的功能)和中性粒细胞浸润。高氧已被证明会增加呼吸机引起的肺损伤,但调节大潮气量和高氧之间相互作用的机制尚不清楚。我们假设使用高氧的大潮气量通气会通过丝氨酸/苏氨酸激酶/蛋白激酶 B (Akt) 途径和内皮一氧化氮合酶 (eNOS) 途径增加 MIP-2 的产生和中性粒细胞浸润。 C57BL/6 小鼠接受大潮气量 (30 ml/kg) 机械通气(室内空气或高氧)1-5 小时。使用高氧诱导中性粒细胞迁移至肺部的大潮气量通气、MIP-2 的产生以及 Akt 和 eNOS 的激活以时间依赖性方式进行。 Akt 突变小鼠的大潮气量通气和 LY294002 对 Akt 的药理学抑制均减弱了中性粒细胞隔离、MIP-2 蛋白产生以及 Akt 和 eNOS 激活。我们得出的结论是,高氧通过激活 Akt 和 eNOS 途径增加了大潮气量诱导的 MIP-2 产生和中性粒细胞流入。
Positive pressure ventilation with large tidal volumes has been shown to cause release of cytokines, including macrophage inflammatory protein-2 (MIP-2), a functional equivalent of human IL-8, and neutrophil infiltration. Hyperoxia has been shown to increase ventilator-induced lung injury, but the mechanisms regulating interaction between a large tidal volume and hyperoxia are unclear. We hypothesized that large tidal volume ventilation using hyperoxia would increase MIP-2 production and neutrophil infiltration via the serine/threonine kinase/protein kinase B (Akt) pathway and the endothelial nitric oxide synthase (eNOS) pathway. C57BL/6 mice were exposed to large tidal volume (30 ml/kg) mechanical ventilation with room air or hyperoxia for 1–5 hours. Large tidal volume ventilation using hyperoxia induced neutrophil migration into the lung, MIP-2 production, and Akt and eNOS activation in a time-dependent manner. Both the large tidal volume ventilation of Akt mutant mice and the pharmacological inhibition of Akt with LY294002 attenuated neutrophil sequestration, MIP-2 protein production, and Akt and eNOS activation. We conclude that hyperoxia increased large tidal volume-induced MIP-2 production and neutrophil influx through activation of the Akt and eNOS pathways.
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高氧通过促丝分裂原激活的蛋白激酶增加了呼吸机诱导的肺损伤:一种前瞻性,受控的动物实验。
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