Determinants of leukocyte margination in rectangular microchannels.

Determinants of leukocyte margination in rectangular microchannels.
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DOI:
10.1371/journal.pone.0007104
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发表时间:
2009-09-21
期刊:
影响因子:
3.7
通讯作者:
Munn LL
Munn LL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jain A;Munn LL

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聚二甲基硅氧烷(PDMS)器件的微细加工为在真实的微血管尺度上研究血液的流体动力学提供了一套新的工具。然而,我们才刚刚开始了解这项技术的力量和局限性。为了确定PDMS微通道用于血流分析的适用性,我们研究了各种几何形状和血液成分的通道中的白色血细胞(WBC)边集。我们发现白细胞更喜欢在突然扩张的下游边缘化,红细胞(RBC)聚集促进了这一过程。与管相反,WBC边集在我们的低纵横比、伪2D矩形通道中限于侧壁,因此,在各种通道几何形状中实现了超过95%的边集效率。在这些伪2D通道中,血液流变学和细胞完整性在一定范围的流速下得以保持,其中上限范围受到垂直方向上的剪切力的限制。我们的结论是,有一定的局限性,矩形PDMS微流体通道是有用的工具,定量研究血液流变学。
Microfabrication of polydimethylsiloxane (PDMS) devices has provided a new set of tools for studying fluid dynamics of blood at the scale of real microvessels. However, we are only starting to understand the power and limitations of this technology. To determine the applicability of PDMS microchannels for blood flow analysis, we studied white blood cell (WBC) margination in channels of various geometries and blood compositions. We found that WBCs prefer to marginate downstream of sudden expansions, and that red blood cell (RBC) aggregation facilitates the process. In contrast to tubes, WBC margination was restricted to the sidewalls in our low aspect ratio, pseudo-2D rectangular channels and consequently, margination efficiencies of more than 95% were achieved in a variety of channel geometries. In these pseudo-2D channels blood rheology and cell integrity were preserved over a range of flow rates, with the upper range limited by the shear in the vertical direction. We conclude that, with certain limitations, rectangular PDMS microfluidic channels are useful tools for quantitative studies of blood rheology.
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