関連する実験動画
Updated: Aug 18, 2026

10:31
Real-time Live Imaging of T-cell Signaling Complex Formation
Published on: June 23, 2013
まとめ
この研究は,ヒトリンパ球の中間線維の重要な成分であるヴィメンチンが,キャピング中に細胞表面キャップに再分配されることを明らかにしています. これは,中間の繊維がウロポッド内に固定されていることを示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 細胞骨格ダイナミクス
- 免疫学 免疫学とは
背景:
- 中間フィラメント (IFs) は,真核細胞における主要な細胞プラズマネットワークを形成し,アクチンとマイクロチューブルとは異なる.
- ビメンチンは,メゼンキマ細胞および培養された非メゼンキマ細胞における主要なIFタンパク質です.
- ヴァメンチンに対するモノクローナル抗体は,ウォルデンストロームのマクログロブリン血症の患者から確認された.
研究 の 目的:
- ヒトリンパ球におけるヴィメンチンの存在と組織を調査する.
- リンパ球における中間線維網に対する表面分子封鎖の影響を測定する.
- リンパ球のキャピングとウロポッドの形成における中間フィラメントの潜在的な役割を調査する.
主な方法:
- モノクローナル抗-ヴィメンティン抗体を用いた直接免疫光検査.
- 細胞をコルセミドで処理して,中間線維の集積を誘発する.
- 表面分子キャピング (β2-マイクログローブリンまたは膜免疫グロブリン) の誘導.
- キャピングに対する反応としてヴィメンチン再分布の顕微鏡観察.
主要な成果:
- 人間のB型およびT型リンパ球は,ヴィメンチンで構成された中間線維を持っています.
- コルセミドによる治療により,ヴィメンチンは核酸を明らかに集積した.
- 表面分子のキャッピングは,キャップの下のヴィメンチン再分配につながった.
- コルセミドで処理された細胞では,キャップの位置が一貫してヴィメンチン集積物と重なり合っていた.
結論:
- ビメンチンは,ヒトリンパ球における主要な中間線維タンパク質である.
- リンパ球の表面封鎖は,ヴィメンチンネットワークのダイナミックな再編成を誘導する.
- この発見は,中間繊維がウロポッド内に固定され,リンパ球のキャピングに役割を果たしていることを示唆しています.
関連する概念動画
Adaptability of Cytoskeletal Filaments
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
Formation of Intermediate Filaments
Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.
Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Disassembly of Intermediate Filaments
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Immunoglobulin-like Cell Adhesion Molecules
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...

