Ambra1は,オートファギーと神経系の発達を調節する
Gian Maria Fimia1, Anastassia Stoykova, Alessandra Romagnoli
1National Institute for Infectious Diseases, IRCCS L. Spallanzani, 00149 Rome, Italy.
Nature
|June 26, 2007
まとめ
新しく発見されたタンパク質であるAmbra1は,胚の発達に不可欠な細胞リサイクルプロセスであるオートファギーを調節する. マウスにおけるその欠乏は重度の神経管の欠陥を引き起こし,哺乳類の神経発達におけるオートファギーの役割を強調する.
科学分野:
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学について
- 分子生物学は分子生物学である.
背景:
- オートファギーは,細胞の成分を分解し,リサイクルするための基本的な細胞プロセスです.
- 大人の場合,オートファギーの役割は極めて重要であるが,胚の発達,特に脊椎動物におけるその役割は,未だに十分に理解されていない.
- Beclin1は,胚の生存に不可欠な自己ファゴソーム形成の重要な調節体です.
研究 の 目的:
- 胚形成に関わるオートファギーの新しい調節体を特定し,特徴づけること.
- 新しく特定されたタンパク質Ambra1のオートファジーと胚の発達における機能を明らかにする.
主な方法:
- アムブラ1の過剰発現とRNAの干渉を含むインビトロ実験で,オートファギーの制御作用を評価した.
- アムブラ1欠乏症のマウスモデルを用いたインビボ研究で,胚の発達と関連する細胞欠陥を観察した.
主要な成果:
- Ambra1は,Beclin1に依存したオートファジー経路の正の調節剤として作用する.
- マウス胚におけるAmbra1欠乏は,重度の神経管の欠陥を引き起こす.
- アムブラ1欠乏の胚では,オートファギーの障害,タンパク質の蓄積,細胞増殖/アポトーシスの制御不全が観察されました.
結論:
- Ambra1は,哺乳類の胚形成において重要な役割を担う,新型で重要なオートファギーの調節体です.
- この研究は,神経発達におけるオートファジー,細胞成長,細胞死との相互作用について,in vivoの証拠を提供している.
さらに関連する動画
11:39Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry
Published on: July 21, 2017
32.6K
09:10siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
Published on: October 28, 2019
7.9K
関連する概念動画
Delivery Pathways to the Lysosome
10.6K
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...
10.6K
Autophagy
6.5K
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,...
6.5K
Autophagic Cell Death
5.1K
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...
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
5.1K
Gut-Brain Axis
151
The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such...
151
Cellular Injury V: Apoptosis and Autophagy
7
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...
7
