関連する実験動画
Updated: Sep 9, 2025

07:00
Using Caco-2 Cells to Study Lipid Transport by the Intestine
Published on: August 20, 2015
19.0K
流れは,細胞外脂質を固定したタンパク質を,生きているCOS-7細胞の表面に運ぶ
bioRxiv : the preprint server for biology
|September 5, 2025
まとめ
細胞膜は流動的ですが 流動はタンパク質を組織することができます この研究は,細胞表面のタンパク質が 流体切断ストレスに反応して 移動し,グラデーションを形成し,細胞の流れを感知するための新しいメカニズムを明らかにしている.
科学分野:
- 細胞生物学
- バイオ物理学
- 膜ダイナミクス
背景:
- 細胞のプラズマ膜は液体であり,脂質とタンパク質の急速な拡散を可能にします.
- 分子運動は細胞骨格と細胞外グリコカリックスによって制限される.
- 生物学的流動は細胞表面に切断ストレスを及ぼし,生理学的プロセスに影響を与えます.
研究 の 目的:
- 膜タンパク質の分布に対する流体切断ストレスの影響を調査する.
- グライコカリクスが細胞膜をシアストレスから保護するか,またはフロー誘発による再分配を容易にするかどうかを判断する.
- 膜タンパク質の空間的組織化のためのメカニズムとして,受動的なフロー輸送を探求する.
主な方法:
- 生きたCOS-7細胞に制御されたシェアストレスを適用した.
- 活細胞画像を用いて2つの特定の脂質固定膜タンパク質の再分布を観察した.
- タンパク質濃度グラデーションのダイナミックと空間的特性を分析した.
主要な成果:
- 2つの異なる脂質に固定されたタンパク質は,適用されたフローの方向で細胞全体の可逆的濃度グラデーションを形成しました.
- 生理学的切断ストレスレベルでは,タンパク質の再配分が急速に (数分以内に) 発生した.
- グラデーションの動態は 流体による受動的輸送と一致していた.
結論:
- パッシブ・フロー・トランスポートは,膜タンパク質の空間的組織化のための有効なメカニズムです.
- このメカニズムは,フローにさらされた細胞で以前に観察されたタンパク質のパターンを説明するかもしれません.
- 流動誘発型タンパク質再配分は 細胞の流動感知における最初のステップです
関連する概念動画
COP Coated Vesicles
8.0K
Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
8.0K
Protein Diffusion in the Membrane
4.5K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
4.5K
Membrane Fluidity
11.9K
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
11.9K
Protein Translocation Machinery on the ER Membrane
4.9K
The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
4.9K
Fluid Mosaic Model
12.7K
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
12.7K
Transport Across the Golgi
4.4K
While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
4.4K

