関連する実験動画
Updated: Feb 12, 2026

10:59
Human Blastocyst Biopsy and Vitrification
Published on: July 26, 2019
23.7K
マウス 胚 の 芽細胞 形成 の ため の 膨張 アクチン リング の リッパー
Jennifer Zenker1, Melanie D White1, Maxime Gasnier1
1Institute of Molecular and Cell Biology, A(∗)STAR, Singapore.
Cell
|March 27, 2018
まとめ
胚胞形成の際に胚の密封は,新しいアクチン-ジッパーメカニズムを含みます. このプロセスは,非収縮性アクチンリングを使用して,早期開発のための重要な透過性障壁を確立します.
科学分野:
- 細胞生物学
- 発達生物学
- バイオ物理学
背景:
- ブラストシストの形成には,パラセル透過性バリアの確立が必要です.
- このバリアは 芽胞腔の膨張と胚の適切な発達に不可欠です
研究 の 目的:
- モルラからブラストシストへの移行中の胚の密封の分子メカニズムを解明する.
- ブラストシストの透過性バリアの確立におけるアクチンダイナミクスの役割を特定する.
主な方法:
- 移植前のマウス胚の生体画像
- 高解像度顕微鏡で細胞骨格の動態 (F-アクチン,マイクロチューブル) を可視化する.
- 交差点タンパク質とミオシンIIの免疫光染色
主要な成果:
- 非収縮性F-アクチンリングは,外部のブラストメアの頂点に集合する.
- 極小管はF-アクチンを排除し,リング形成を誘導する.
- アクチン環は細胞の結合に広がり,アデレンスと緊密な結合タンパク質を集めます
- 交差点におけるミオシンIIの蓄積は,張力に依存するジッパーメカニズムをシール開始します.
結論:
- 新しいアクチン・ジッパーメカニズムで 収縮リングとは異なり 胚の密閉を促します
- このメカニズムは,ブラストシスト形成に必要なパラセルラーバリアの確立に不可欠です.
- この発見は,アクチンベースの細胞結合制御の新たな仕組みを明らかにした.
関連する概念動画
Formation of Higher-order Actin Filaments
3.7K
The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin...
The high-order actin...
3.7K
Actin Treadmilling
9.8K
Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
9.8K
Introduction to Actin
6.7K
Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution. Actin coding genes are conserved within species and across...
6.7K
Actin Polymerization
8.6K
Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶ nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
8.6K
Actin Filament Depolymerization
4.0K
Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
In F-actin, the ADF/cofilin proteins...
4.0K
The Role of Actin and Myosin in Non-muscle Cells
5.0K
Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They are held...
5.0K

