関連する実験動画
Updated: Jul 18, 2026

15:39
Studying Organelle Dynamics in B Cells During Immune Synapse Formation
Published on: June 1, 2019
付属体とエクソサイトーシス
1Department of Pharmacology, University of Virginia, Charlottesville 22908.
まとめ
アネキシンとは,細胞膜を橋渡しするカルシウム結合タンパク質です. この研究では,細胞内通信の重要なプロセスであるエクソサイトーシス (exocytosis) 中の膜融合におけるそれらの役割を調査しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- アネキシン (Annexin) は,カルシウムに依存した方法でフォスホリピドを結合することが知られているタンパク質の一族です.
- これらのタンパク質は"二価"な活動を持ち,カルシウム活性化時に2つの膜を橋渡しすることができる.
- 彼らの機能は,細胞膜と細胞プラズマの間のコミュニケーションを媒介する役割を果たすことを示唆しています.
研究 の 目的:
- 付属体が膜の接触と融合を媒介するという仮説を検証する.
- エキソサイトーシスの過程におけるアネキシンの特定の役割を探求する.
主な方法:
- この研究は,膜結合と相互作用に関連する付属体の機能特性に焦点を当てています.
- アネクシンのカルシウムに依存する二価活性性を調査する.
主要な成果:
- アネクセインは,カルシウムに依存した方法でリンパ脂に結合する.
- アネキシンには二価活性があり,カルシウムの存在で2つの膜を一緒に引き寄せます.
- この活動は,膜融合における彼らの提案された役割をサポートしています.
結論:
- アネキシンは,カルシウム依存性膜相互作用の重要な媒介者である.
- アネクシンの二価活性性は,膜の接触と融合の開始に不可欠です.
- アネキシンは,分泌膀とプラズマ膜融合を促進することによって,エクソサイトーシス経路において重要な役割を果たしている可能性が高い.
関連する概念動画
Exocytosis
Exocytosis is used to release material from cells. Like other bulk transport mechanisms, exocytosis requires energy.
Maturation of Endosomes
The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
Exocytosis
Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
Enlargement of the Plasma Membrane
Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
The Phragmoplast
Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
The...
The...
Distribution of Cytoplasmic Content
Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of small...
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of small...

