アポトーシス:複雑性のために (β) NACを持つプロセス
1Laboratory of Developmental Genetics, The Rockefeller University, New York, NY 10021, USA.
Cell
|September 25, 2003
まとめ
研究者らは,C. elegansのプログラム細胞死に対する新しい阻害剤,ICD-1を発見した. ICD-1の喪失は,鍵となる ced-3カスパースとは独立してアポトシスを促進し,新しい細胞死経路を明らかにします.
科学分野:
- 発達生物学 発達生物学について
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- プログラムされた細胞死,またはアポトーシスは,発達と組織ホメオスタシスにとって極めて重要です.
- nematode C. elegans では,アポトーシスは主に ced-3 caspase によって調節されます.
- 代替的な細胞死経路を理解することは,アポトーシス調節の完全なイメージのために不可欠です.
研究 の 目的:
- C. elegans.におけるプログラム細胞死の新たなレギュレータを特定する.
- ced-3カスパースの活性から独立して作用するアポトーシスのメカニズムを調査する.
主な方法:
- 細胞死に影響を与える突然変異を特定するために,C. elegansの遺伝子スクリーンを利用しました.
- 特定された遺伝子の機能を特徴付けるための分子および細胞分析を行った.
- 新型遺伝子と既知のアポトーシス調節体の間の遺伝的相互作用を調査した.
主要な成果:
- 死亡阻害剤をコードする新しい遺伝子,icd-1を特定し,特徴づけました.
- ICD-1における機能喪失変異がアポトーシスを促進することを実証した.
- ICD-1媒介によるアポトーシスは,CED-3カスパース活性とは独立して発生することを示した.
結論:
- icd-1は,C. elegans.におけるプログラム細胞死の新しい阻害剤です.
- C. elegans には,icd-3 独立したアポプトシス経路が存在し,icd-1 によって調節されます.
- この発見は,アポトーシスの複雑な調節に関する私たちの理解を広げています.
関連する概念動画
01:30Overview of Cell Death
Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
01:30Apoptosis
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 reduction of the tissue.
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...