関連する実験動画
Updated: May 2, 2026

08:55
Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
Published on: August 7, 2018
10.1K
SIRT2は死滅のために必要ですか?
Kim Newton1, Joanne M Hildebrand2, Zhirong Shen3
1Genentech, Inc., South San Francisco, California 94080, USA.
Nature
|February 28, 2014
まとめ
この研究では,プログラム細胞死の一種である死滅におけるSIRT2の役割を調査しました. 研究者らは,SIRT2を阻害または除去することは,細胞を死滅から保護しないことを発見し,この経路におけるその重要性を疑問視した.
科学分野:
- 細胞生物学 細胞生物学
- 細胞死亡の分子メカニズム
背景:
- タンパク質の一種であるサートゥインは,脱エチル化によって細胞のプロセスを調節する.
- 以前の研究によると,SIRT2は,細胞死亡の制御された経路である死滅に不可欠であると示唆されていた.
研究 の 目的:
- SIRT2の死滅における役割を確認し,調査する.
- SIRT2が死滅を引き起こす必要性に関する既存の仮説に異議を唱える.
主な方法:
- 複数のSIRT2阻害剤 (AGK2) と遺伝子サイレンシング技術 (siRNAs) を利用した.
- ノックアウトマウスモデル (Sirt2-/-) とワイルドタイプのコントロールを使用した.
- 腫瘍死滅因子 (TNF) と全身性炎症反応症候群 (SIRS) 誘導に対する反応として細胞死が評価された.
主要な成果:
- SIRT2の抑制または減少は,死滅に対して保護を与えませんでした.
- Sirt2-/-マウスは,野生型のマウスと比較して,TNF誘発のSIRSに対する感受性の増加を示した.
- Ripk3 (Ripk3-/-) 欠乏したマウスは死滅に抵抗し,陽性対照として機能した.
結論:
- この発見は,死滅経路におけるSIRT2の確立された役割に異議を唱えている.
- SIRT2は,以前に示唆されたように,死滅の重要な調節因子ではないかもしれません.
- 細胞死におけるSIRT2の機能を完全に解明するには,さらなる研究が必要である.
関連する概念動画
Necrosis
5.2K
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become...
5.2K
Overview of Cell Death
7.7K
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...
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...
7.7K
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
Autophagic Cell Death
3.3K
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...
3.3K
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
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

