関連する実験動画
Updated: May 1, 2026

13:21
In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila
Published on: November 27, 2016
8.6K
DCC遺伝子製品は,受容体タンパク質分解を必要とするメカニズムによってアポトーシスを誘発する
P Mehlen1, S Rabizadeh, S J Snipas
1Program on Aging, The Burnham Institute, La Jolla, California 92037, USA.
Nature
|October 31, 1998
まとめ
結腸直腸がん (DCC) で削除された遺伝子は,そのリガンドであるネトリン-1が欠けると,アポトーシスを誘導することによって腫瘍を抑制します. カスパーゼ-3によるDCC分裂は,この腫瘍抑制機能に不可欠である.
科学分野:
- 分子生物学は分子生物学である.
- がん研究 がん研究
- 細胞シグナリング
背景:
- 結腸直腸がんの発症には,候補腫瘍抑制剤DCCを含む遺伝子変異が伴う.
- DCCは,軸索誘導に不可欠なネトリン-1受容体をコードする.
- DCC発現の喪失は腫瘍発生性と相関しているが,そのメカニズムは不明である.
研究 の 目的:
- DCCが腫瘍形成を抑制するメカニズムを解明する.
- DCC機能におけるネットリン-1結合とカスパース分裂の役割を調査する.
主な方法:
- ネトリン-1を併用して,または併用せずに,アポトーシスに対するDCCの効果を調査した.
- カスパース基板としてDCCを特定した.
- アポトーシスへの影響を評価するために,DCCのカスパース-3分裂部位を変異させた.
主要な成果:
- DCCは,ネットリン-1結合とは無関係にアポトーシスを誘発する.
- DCCに結合するネットリン-1はアポトーシスを阻害する.
- カスパーゼ3によるDCCの割れは,そのプロアポプトティック活動のために,特にAsp 1,290.0で必要です.
結論:
- DCCは,ネットリン-1が利用できないときにアポトーシスを促進することによって,腫瘍抑制剤として機能します.
- このプロアポプトシス機能は,カスパースカスケードによって媒介され,Asp 1,290.0でDCC割れを必要とします.
- DCCのメカニズムは,腫瘍抑制に不可欠なカスパーゼ媒介の割れ方によるリガンド独立のアポトーシス誘導を含む.
関連する概念動画
Apoptosis
12.0K
Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
12.0K
Caspases
8.7K
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
8.7K
The Extrinsic Apoptotic Pathway
6.2K
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...
6.2K
The Intrinsic Apoptotic Pathway
6.2K
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...
6.2K
Phagocytosis of Apoptotic Cells
3.9K
Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or immature dendritic cells. Non-professional phagocytes such as epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes.
Normal cells contain receptors that prevent them from being recognized...
Normal cells contain receptors that prevent them from being recognized...
3.9K
Cellular Injury V: Apoptosis and Autophagy
99
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...
99

