関連する実験動画
Updated: Jul 5, 2026
08:35
Examining BCL-2 Family Function with Large Unilamellar Vesicles
Published on: October 5, 2012
Bcl-2の抗アポプトシスタンパク質は,ベクリン1依存の自を阻害する
Sophie Pattingre1, Amina Tassa, Xueping Qu
1Department of Medicine, Columbia University College of Physicians & Surgeons, New York, New York 10032, USA.
Cell
|September 24, 2005
まとめ
また,抗アポプトシスタンパク質Bcl-2は,Beclin 1と相互作用することで,オートファギーを抑制する. この相互作用は,オートファギーのレベルを調節し,過剰な細胞死を防ぐことで,細胞生存を維持するのに役立ちます.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- アポトーシスとオートファギーは,組織ホメオスタシス,発達,疾患に関与する重要な生物学的プロセスです.
- 抗アポプトシスタンパク質Bcl-2は,オートファギータンパク質Beclin 1と相互作用することが知られているが,この相互作用の機能的意義は不明である.
研究 の 目的:
- Bcl-2とBeclinの相互作用の機能的意義を調査する 1.
- Bcl-2がBeclinとの相互作用によって自を調節するかどうかを判断する 1.
主な方法:
- 酵母と哺乳類の細胞モデルを用いて,野生型のBcl-2とBeclin 1が,欠陥のある変異体と結合し,自閉性の作用を研究した.
- マウスの心臓筋におけるオートファギーの心臓Bcl-2トランスジェニック発現の役割を調査した.
- Bcl-2を結合できないBeclin 1変異体が,オートファギーの誘導と細胞死亡に及ぼす影響を調査した.
主要な成果:
- 野生型Bcl-2,ベクリン1結合欠陥変異体ではないが,酵母と哺乳類の細胞の両方でベクリン1依存の自を阻害した.
- 心臓Bcl-2のトランスジェニック発現は,マウスの心臓筋におけるオートファギーの抑制につながった.
- Bcl-2に結合できないBeclin 1変異体は,野生型Beclin 1と比較して,より高いレベルのオートファギーを誘発し,細胞死を促進しました.
結論:
- Bcl-2は,抗アポプトシスタンパク質として機能するだけでなく,Beclin 1との抑制相互作用を通じて,抗オートファジータンパク質としても機能します.
- Bcl-2の抗オートファジー機能は,適切なオートファジーレベルを維持するために決定的に重要であり,それによって細胞死よりも細胞生存を促進する可能性があります.
関連する概念動画
01:36Delivery Pathways to the Lysosome
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
01:27Autophagy
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
01:17The Extrinsic Apoptotic Pathway
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
01:31The Intrinsic Apoptotic Pathway
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
01:18Autophagic Cell Death
Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
01:22Cellular Injury V: Apoptosis and Autophagy
Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...