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首页> 外文期刊>Journal of Biomechanics >A numerical study to determine pericellular matrix modulus and evaluate its effects on the micromechanical environment of chondrocytes.
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A numerical study to determine pericellular matrix modulus and evaluate its effects on the micromechanical environment of chondrocytes.

机译:数值研究确定细胞周围基质模量并评估其对软骨细胞微机械环境的影响。

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摘要

Chondrocyte biosynthesis is highly sensitive to mechanical strain. A thin pericellular matrix (PCM) surrounds the cell and plays an important role in mechanotransduction. PCM material properties are difficult to measure directly because of its size and connectivity to both cell and extracellular matrix (ECM). The purpose of this study was to develop a method of calculating linear elastic properties of the PCM using an inverse finite element approach with experimental properties of cell and chondron taken from the literature. Finite element models were constructed of both the equivalent chondron case and the chondrocyte-PCM structure, and a Fibonacci search obtained PCM moduli that matched the ECM strain field between the two cases. The most important result was that ECM strain adjacent to a chondron inclusion was sensitive to the chondron properties and may be used to calculate PCM mechanical properties, consistent with our strain field hypotheses. PCM moduli obtained through this method range from 43 to 240 kPa, were significantly higher than previously published but resulted in only a 0.5-21% decrease in relative effective cell strain. Similarities between effective strain ratios led to the conclusion that matching experimental techniques used to measure cell and PCM properties was more important than absolute values of the properties.
机译:软骨细胞的生物合成对机械应变高度敏感。薄的细胞周围基质(PCM)围绕细胞并在机械转导中起重要作用。由于PCM材料的尺寸以及与细胞和细胞外基质(ECM)的连接性,因此很难直接测量PCM材料的性能。这项研究的目的是开发一种使用逆有限元方法计算PCM线性弹性特性的方法,该方法具有从文献中获得的细胞和软骨素的实验特性。构造了等效的软骨细胞情况和软骨细胞-PCM结构的有限元模型,并通过斐波那契搜索获得了与两种情况之间的ECM应变场相匹配的PCM模量。最重要的结果是,与软骨素夹杂物相邻的ECM应变对软骨素特性敏感,可用于计算PCM力学特性,这与我们的应变场假设一致。通过此方法获得的PCM模量范围为43至240 kPa,显着高于以前发表的方法,但相对有效细胞株仅降低了0.5-21%。有效应变比之间的相似性得出这样的结论:用于测量单元和PCM特性的匹配实验技术比特性的绝对值更为重要。

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