Effect of amplitude and duration of impulsive pressure on endothelial permeability in in vitro fluid percussion trauma

BioMedical Engineering OnLine

Hiromichi Nakadate²  Koji Inuzuka²  Suguru Akanuma²  Akira Kakuta¹  Shigeru Aomura² 

[1] Advanced Course of Mechanical and Computer Systems Engineering, Tokyo National College of Technology, Tokyo, Japan

[2] Graduate School of System Design, Tokyo Metropolitan University, Tokyo, Japan

关键词: Vascular endothelial cadherin;    Transendothelial electrical resistance;    Endothelial permeability;    Pressure duration;    Pressure amplitude;    Negative pressure;    Positive pressure;    Fluid percussion;    Impulsive pressure;    Head impact;   

Others  :  794907
DOI  :  10.1186/1475-925X-13-44

 received in 2013-12-11, accepted in 2014-04-04,  发布年份 2014

【 摘 要 】

Background

Intracranial pressure changes during head impact cause brain injuries such as vasogenic edema and cerebral contusion. However, the influence of impulsive pressure on endothelial function has not yet been fully studied in vitro. In this study, we developed a pressure loading device that produced positive and negative pressures by modifying an in vitro fluid percussion model and examined the effects of the amplitude and duration of the pressures on endothelial permeability.

Methods

Human umbilical vein endothelial cells were subjected to three types of positive pressure (average amplitude/average duration of 352 kPa/23 ms, 73 kPa/27 ms, and 70 kPa/44 ms) and three types of negative pressure (−72 kPa/41 ms, −67 kPa/104 ms, and −91 kPa/108 ms), and the transendothelial electrical resistance (TEER) was measured between 15 min and 24 h after pressure loading for quantifying the formation of an integral monolayer of endothelial cells. After loading, vascular endothelial- (VE-) cadherin, an endothelium-specific cell-cell adhesion molecule involved in endothelial barrier function, was stained and observed using fluorescence microscopy.

Results

The pressure loading device could produce positive pressure pulses with amplitudes of 53–1348 kPa and durations of 9–29.1 ms and negative pressure pulses with amplitudes of −52–−93 kPa and durations of 42.9–179.5 ms. The impulsive pressure reduced the TEER associated with the change in VE-cadherin localization. Additionally, TEER decreased considerably at 15 min and 6 h post-loading, with these changes being significant in positive pressure with larger amplitude and shorter duration and in all types of negative pressures compared to pre-loading.

Conclusions

The changes in intracranial pressure during head impact impair endothelial barrier function by the disruption of the integrity of endothelial cell-cell junctions, and the degree of increase in endothelial permeability depends on the amplitude, duration, and direction (compressive and tensile) of the impulsive pressure.

【 授权许可】

   
2014 Nakadate et al.; licensee BioMed Central Ltd.

【 图 表 】

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