Interactions of Cartilage Extracellular Matrix Macromolecules.

Interactions of Cartilage Extracellular Matrix Macromolecules.
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DOI:
10.1002/polb.23191
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发表时间:
2012-12-15
影响因子:
--
通讯作者:
Horkay, Ferenc
Horkay, Ferenc
中科院分区:
工程技术3区
文献类型:
--
作者:
Horkay, Ferenc

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关节软骨是位于关节表面的低摩擦、承重组织。软骨的细胞外基质 (ECM) 由纤维状胶原蛋白网络组成,该网络通过嵌入胶原蛋白网络中的带负电的蛋白聚糖聚集体施加的渗透膨胀压力而产生预应力。主要的蛋白聚糖是洗瓶刷状聚集蛋白聚糖,它与线性透明质酸链形成复合物。我们使用一组互补的物理测量来量化聚集蛋白聚糖和透明质酸之间自组装产生的微观和宏观变化,通过结合散射技术(包括小角度 X 射线散射、小角度中子散射和动态光散射与宏观渗透压测量)来确定结构和相互作用。研究表明,决定软骨承载能力的渗透压主要由 ECM 的主要大分子成分(聚集蛋白聚糖和胶原蛋白)决定。了解软骨 ECM 大分子成分之间的相互作用对于了解生物功能和开发成功的软骨修复组织工程策略至关重要。
Articular cartilage is a low-friction, load-bearing tissue located at joint surfaces. The extracellular matrix (ECM) of cartilage consists of a fibrous collagen network, which is pre-stressed by the osmotic swelling pressure exerted by negatively charged proteoglycan aggregates embedded in the collagen network. The major proteoglycan is the bottlebrush shaped aggrecan, which forms complexes with linear hyaluronic acid chains. We quantify microscopic and macroscopic changes resulting from self-assembly between aggrecan and hyaluronic acid using a complementary set of physical measurements to determine structure and interactions by combining scattering techniques, including small-angle X-ray scattering, small-angle neutron scattering, and dynamic light scattering with macroscopic osmotic pressure measurements. It is demonstrated that the osmotic pressure that defines the load bearing ability of cartilage is primarily governed by the main macromolecular components (aggrecan and collagen) of the ECM. Knowledge of the interactions between the macromolecular components of cartilage ECM is essential to understand biological function and to develop successful tissue engineering strategies for cartilage repair.
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