関連する実験動画
Updated: Jul 5, 2026
10:31
Real-time Live Imaging of T-cell Signaling Complex Formation
Published on: June 23, 2013
人間の記憶T細胞の活性化に無関係な結合が,粘着分子ELAM-1に結合する
1Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
Nature
|February 28, 1991
まとめ
内皮細胞粘着分子1 (ELAM-1) を含む新たに特定された経路は,インテグリン経路とは異なる炎症性内皮へのメモリT細胞粘着を媒介する. これは,ELAM-1が,記憶T細胞の炎症部位への移行の鍵であることを示唆しています.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 内皮細胞生物学 内皮細胞生物学
背景:
- 炎症性サイトカインは,Tリンパ球サブセットの移動に不可欠な内皮細胞に粘着分子を誘導します.
- 2つの経路であるVLA-4とLFA-1インテグリンは,T細胞が活性化された内皮に付着することを媒介する.
研究 の 目的:
- T細胞が活性化された内皮に粘着する第三の経路を調査する.
- T細胞結合における内皮細胞粘着分子1 (ELAM-1) の役割を特徴づける.
主な方法:
- 休息中のCD4+T細胞のIL-1誘発ヒト内皮細胞への結合を研究した.
- 浄化されたELAM-1に対するT細胞の粘着を調査した.
主要な成果:
- ELAM-1を含む第三の経路は,活性化された内皮に休息中のCD4+T細胞の結合に寄与する.
- ELAM-1は,急激な活性化イベントとは独立して,メモリT細胞結合を独占的に媒介する.
- この3つの経路 (VLA-4,LFA-1,ELAM-1) はすべて,ネイブT細胞よりも高いメモリT細胞粘着に寄与する.
結論:
- ELAM-1は,メモリT細胞が炎症した内皮に最初結合する際に重要な役割を果たします.
- ELAM-1は,メモリT細胞が組織や炎症部位に優先的に移動する上で重要な役割を果たす可能性がある.
関連する概念動画
01:15Activation of Integrins
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
01:17Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
01:03Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...