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Updated: Mar 6, 2026
In vivo Measurement of the Mouse Pulmonary Endothelial Surface Layer
Published on: February 22, 2013
Increased Circulating Endothelial Microparticles Associated with PAK4 Play a Key Role in Ventilation-Induced Lung
Shuming Pan1, Aihua Fei1, Lihong Jing2
1Emergency Department, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China.
Abstract:
Inappropriate mechanical ventilation (MV) can result in ventilator-induced lung injury (VILI). Probing mechanisms of VILI and searching for effective methods are current areas of research focus on VILI. The present study aimed to probe into mechanisms of endothelial microparticles (EMPs) in VILI and the protective effects of Tetramethylpyrazine (TMP) against VILI. In this study, C57BL/6 and TLR4KO mouse MV models were used to explore the function of EMPs associated with p21 activated kinases-4 (PAK-4) in VILI. Both the C57BL/6 and TLR4 KO groups were subdivided into a mechanical ventilation (MV) group, a TMP + MV group, and a control group. After four hours of high tidal volume (20 ml/kg) MV, the degree of lung injury and the protective effects of TMP were assessed. VILI inhibited the cytoskeleton-regulating protein of PAK4 and was accompanied by an increased circulating EMP level. The intercellular junction protein of β-catenin was also decreased accompanied by a thickening alveolar wall, increased lung W/D values, and neutrophil infiltration. TMP alleviated VILI via decreasing circulating EMPs, stabilizing intercellular junctions, and alleviating neutrophil infiltration.
Insights
Mechanical ventilation can harm lungs, causing ventilator-induced lung injury (VILI). Tetramethylpyrazine (TMP) protects against VILI by reducing endothelial microparticles (EMPs) and stabilizing lung cell junctions.
Area of Science:
- Pulmonary Medicine
- Critical Care Medicine
- Cell Biology
Background:
- Inappropriate mechanical ventilation (MV) is a significant cause of ventilator-induced lung injury (VILI).
- Understanding the mechanisms of VILI and identifying protective strategies are crucial research areas.
- Endothelial microparticles (EMPs) are implicated in VILI pathogenesis.
Purpose of the Study:
- To investigate the role of EMPs associated with p21 activated kinases-4 (PAK-4) in VILI.
- To evaluate the protective effects of Tetramethylpyrazine (TMP) against VILI.
Main Methods:
- Utilized C57BL/6 and Toll-like receptor 4 knockout (TLR4KO) mouse models subjected to mechanical ventilation (MV).
- Assessed lung injury, circulating EMP levels, PAK-4, and β-catenin expression after 4 hours of high tidal volume MV.
- Administered TMP to assess its protective effects in MV-induced lung injury.
Main Results:
- VILI led to decreased PAK-4 and β-catenin levels, increased circulating EMPs, thickened alveolar walls, and neutrophil infiltration.
- TMP treatment alleviated VILI by reducing circulating EMPs and neutrophil infiltration.
- TMP stabilized intercellular junctions, mitigating lung injury.
Conclusions:
- EMPs, particularly those associated with PAK-4, play a role in VILI.
- TMP demonstrates protective effects against VILI by targeting EMPs and improving endothelial barrier function.
- Targeting EMPs represents a potential therapeutic strategy for preventing VILI.
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