Toll-like receptor 4-myeloid differentiation factor 88 signaling contributes to ventilator-induced lung injury in mice.
Toll-like receptor 4-myeloid differentiation factor 88 signaling contributes to ventilator-induced lung injury in mice.
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DOI：
10.1097/aln.0b013e3181e89ab2
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发表时间：
2010-09
期刊：
影响因子：
8.8
通讯作者：
Zhang LM
中科院分区：
文献类型：
--
作者：
Li H;Su X;Yan X;Wasserloos K;Chao W;Kaynar AM;Liu ZQ;Leikauf GD;Pitt BR;Zhang LM
The mechanisms of ventilator-induced lung injury, an iatrogenic inflammatory condition induced by mechanical ventilation, are not completely understood. Toll-like receptor 4 (TLR4) signaling via the adaptor protein, myeloid differentiation factor 88 (MyD88) is proinflammatory and plays a critical role in host immune response to invading pathogen and noninfectious tissue injury. The role of TLR4-MyD88 signaling in ventilator-induced lung injury remains incompletely understood. Mice were ventilated with low or high tidal volume (HTV), 7 or 20 ml/kg, after tracheotomy for 4 h. Control mice were tracheotomized without ventilation. Lung injury was assessed by: alveolar capillary permeability to Evans blue albumin, wet/dry ratio, bronchoalveolar lavage analysis for cell counts, total proteins and cytokines, lung histopathology, and plasma cytokine levels. Wildtype mice subjected to HTV had increased: pulmonary permeability; inflammatory cell infiltration/lung edema; and interleukin-6/macrophage-inflammatory protein-2 in the lavage compared to control. In HTV, inhibitor of κB alpha decreased whereas phosphorylated extracellular signal-regulated kinases increased. TLR4 mutant and MyD88−/− mice showed markedly attenuated response to HTV, including less lung inflammation; pulmonary edema; and cell number, protein content, and the cytokines in the lavage. Furthermore, compared to wildtype, both TLR4 mutant and MyD88−/− mice had significantly higher inhibitor of κB alpha and reduced extracellular signal-regulated kinases phosphorylation following HTV. TLR4-MyD88 signaling plays an important role in the development of ventilator-induced lung injury in mice, possibly through mechanisms involving nuclear factor-κB and mitogen-activated protein kinase pathways.
