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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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関連する実験動画

Updated: Jan 8, 2026

Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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脳発達におけるシナプス可塑性を維持する細胞外マトリックスのタンパク質分解

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
まとめ

細胞外マトリックス（ECM）は、脳の発達および運動学習に不可欠な動的シナプスを維持します。ミクログリア由来のMMP14とブレビカンは、シナプス安定性と可塑性の重要な調節因子です。

キーワード:
細胞外マトリックスシナプス可塑性脳発達MMP14ブレビカン運動学習

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Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Implantation of a Cranial Window for Repeated In Vivo Imaging in Awake Mice

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関連する実験動画

Last Updated: Jan 8, 2026

Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
08:30

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Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Implantation of a Cranial Window for Repeated In Vivo Imaging in Awake Mice
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科学分野:

  • 神経科学;発生生物学;細胞生物学

背景:

  • 細胞外マトリックス（ECM）はシナプス可塑性に影響を与えますが、その発達における役割は完全には理解されていません。; 以前の研究は、主に成人脳におけるECMの機能に焦点を当てていました。

研究 の 目的:

  • 脳発達中のシナプス動態と可塑性の調節におけるECMリモデリングの役割を調査すること。; シナプス安定性に対するブレビカンとマトリックスメタロプロテアーゼ14（MMP14）の寄与を定義すること。

主な方法:

  • ゼブラフィッシュ後脳における興奮性シナプスのライブイメージング。; 遺伝子操作（ブレビカン欠損、MMP14喪失）およびECM消化。; シナプス密度、寿命、および経験依存的可塑性の分析。; ヒトiPS細胞由来培養および数理モデリングを利用しました。

主要な成果:

  • シナプスは、動的および安定した集団の二峰性分布を示します。; ECMの破壊は動的シナプスを不安定化させ、全体的なシナプス密度を低下させました。; ミクログリア由来のMMP14の喪失はブレビカンレベルを増加させ、動的シナプスの寿命を延長し、密度を増加させました。; MMP14とブレビカンは、経験依存的な運動学習に不可欠でした。

結論:

  • ECMリモデリングは、発達中のシナプスの動的なサブセットを維持するために重要です。; ミクログリア由来のMMP14とブレビカンは、シナプス安定性と可塑性の調節において、重要かつ協調的な役割を果たします。; これらの発見は、脳の発達とシナプス機能に関わる分子メカニズムに新たな洞察を提供します。