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The Extracellular Matrix01:42

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Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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软骨细胞外矩阵聚合物:层次结构,透性质和功能.

Ferenc Horkay1, Peter J Basser1, Erik Geissler2

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概括

软骨蛋白质糖因其等级结构而表现出增强的机械和透性质. 这种瓶架构改善了软骨的水分和压缩阻力.

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科学领域:

  • 生物物理学的生物物理.
  • 材料科学 材料科学 材料科学
  • 生物化学 生物化学

背景情况:

  • 蛋白质甘氨酸对软骨水分和压缩阻力至关重要.
  • 软骨矩阵表现出具有明显结构层次的层次组织.

研究的目的:

  • 在不同的等级层面确定软骨蛋白质糖的静态和动态特性.
  • 研究分子架构在生物机械功能中的作用.

主要方法:

  • 测量奥斯莫斯压力.
  • 小角度中子散射 (SANS). 微角中子散射.
  • 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS). 动态光散射 (DLS).

主要成果:

  • 随着结构复杂度的增加,奥斯莫斯模量增加:孔德里硫酸盐 (CS) <亚格雷坎 <亚格雷坎-氨酸 (HA) 复合物.
  • 层次的瓶结构增强了机械性能和透性抵抗.
  • 在CS溶液中,扩散系数 (D) 是快速的,且对离子的依赖程度较低;亚格兰和亚格兰-HA复合体对不敏感.

结论:

  • 蛋白质甘氨酸分子复杂性的增加显著改善了软骨的生物机械功能.
  • aggrecan的瓶刷配置是其承载能力的关键.
  • 原蛋白在拉伸强度中的作用补充了蛋白质甘氨酸的承载功能.