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相关概念视频

Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

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Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
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Extracellular Matrix01:26

Extracellular Matrix

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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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The Extracellular Matrix01:42

The Extracellular Matrix

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Overview
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The Extracellular Matrix01:29

The Extracellular Matrix

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Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...
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Neuroplasticity01:01

Neuroplasticity

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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
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相关实验视频

Updated: Jan 8, 2026

Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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细胞外矩阵蛋白质溶解在大脑发育期间保持突触可塑性.

Haruna Nakajo1, Ran Cao1, Supriya A Mula1

  • 1Department of Psychiatry and Behavioral Sciences/Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, CA, USA.

Nature neuroscience
|December 22, 2025
PubMed
概括

细胞外基质 (ECM) 维持动态突触,这对大脑发育和运动学习至关重要. 微质MMP14和布雷维坎是突触稳定性和可塑性的关键调节者.

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Last Updated: Jan 8, 2026

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Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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科学领域:

  • 神经科学是一个神经科学.
  • 发展生物学 发展生物学
  • 细胞生物学 细胞生物学

背景情况:

  • 细胞外基质 (ECM) 影响突触可塑性,但其发育作用尚未完全理解.
  • 以前的研究主要集中在成人大脑中的ECM功能上.

研究的目的:

  • 研究ECM重塑在调节突触动力学和脑发育过程中的可塑性中的作用.
  • 确定布雷维坎和矩阵金属蛋白酶14 (MMP14) 对突触稳定的特定贡献.

主要方法:

  • 斑马鱼后脑中激发性突触的实时成像.
  • 基因操纵 (沟删除,MMP14损失) 和ECM消化.
  • 分析突触密度,寿命和经验依赖的可塑性.
  • 利用人类诱导的多能干细胞衍生培养和数学建模.

主要成果:

  • 突触表现出动态和稳定的群体的双模分布.
  • ECM中断破坏了动态突触的稳定性,降低了整体突触密度.
  • 微质MMP14的损失增加了沟水平,延长了动态突触寿命并增加了密度.
  • MMP14和brevican对于经验依赖的运动学习是必不可少的.

结论:

  • 在发育过程中,ECM重塑对于维持突触的动态子集至关重要.
  • 微质MMP14和brevican在调节突触稳定性和可塑性方面发挥着重要的协调作用.
  • 这些发现为管理大脑发育和突触功能的分子机制提供了新的见解.