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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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The Extracellular Matrix01:42

The Extracellular Matrix

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Overview
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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

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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. 
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Golgi Matrix Proteins01:12

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Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
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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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相关实验视频

Updated: May 23, 2025

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 Nakajo, Ran Cao, Supriya A Mula

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    细胞外基质 (ECM) 对于大脑发育至关重要,它调节动态突触. 通过微质MMP14和布雷维坎进行ECM重塑,在发育过程中保持突触稳定性和可塑性.

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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:

    • 突触可塑性对大脑发育和功能至关重要.
    • 细胞外基质 (ECM) 影响突触可塑性,但其发育作用尚不清楚.
    • 现有的研究主要集中在成人突触可塑性机制上.

    研究的目的:

    • 调查ECM重塑在维持大脑发育过程中的动态神经突触中的作用.
    • 定义ECM组件调节突触稳定性和密度的机制.
    • 探索微质矩阵金属蛋白酶14 (MMP14) 和布雷维坎在突触可塑性的参与.

    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淘汰).
    • 在ECM的酶性消化.
    • 人类诱导的多能干细胞 (iPSC) 衍生的神经元培养.
    • 运动学习行为测试.
    • 数学的建模.数学建模.

    主要成果:

    • 观察到动态 (寿命短) 和稳定 (寿命长) 突触的双模分布.
    • ECM中断破坏了动态突触的稳定性,减少了整体突触密度.
    • 微质MMP14的损失导致了积和扩大了稳定的突触池,增加了突触密度.
    • 在运动学习任务中,MMP14和brevican对于体验依赖的突触可塑性至关重要.

    结论:

    • 在大脑发育过程中,ECM重塑对于维持突触的动态子集至关重要.
    • 微质MMP14在调节ECM组成和突触稳定性方面发挥着至关重要的作用.
    • 布雷维坎作为一个关键的ECM组件,影响突触动力学和可塑性.