関連する実験動画
Updated: Jul 6, 2026

13:21
In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila
Published on: November 27, 2016
ドロソフィラカスパース阻害剤DIAP1は細胞生存に不可欠であり,HIDによって陰性調節される
S L Wang1, C J Hawkins, S J Yoo
1Division of Biology MC 156-29, California Institute of Technology, Pasadena 91125, USA.
Cell
|September 11, 1999
まとめ
ドロソフィラ・リーパー (RPR),ヘッド・インヴォルション・デフェクト (HID),GRIMは,細胞死阻害剤であるDIAP1との相互作用を妨害することによって,アポトシスを促進する. DIAP1は,カスパースの活動を阻害し,胚細胞死亡を防ぐために不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
背景:
- カスパゼ依存アポトーシスは,発達に不可欠である.
- DIAP1のようなアポトーシスタンパク質 (IAP) の阻害剤は,アポトーシスを調節する.
- Reaper (RPR),Head Involution Defective (HID),およびGRIMは,ドロソフィラのプロアポプトティックなタンパク質である.
研究 の 目的:
- RPR,HID,GRIMがアポトーシスを誘発するメカニズムを調査する.
- これらのタンパク質と細胞死阻害剤DIAP1.1との相互作用を解明する.
- カスパース活性と細胞生存の調節におけるDIAP1の役割を理解する.
主な方法:
- タンパク質の相互作用を研究するための生化学分析.
- タンパク質の機能を評価するために,ドロソフィラの遺伝子操作.
- カスパース活性と胚死亡率の分析.
主要な成果:
- Head Involution Defective (HID) は,DIAP1のカスパース抑制機能を抑制することが示されました.
- 証拠によると,Reaper (RPR) とGRIMはHID.に似た行動をとっている.
- DIAP1機能の排除は,胚細胞死とカスパース活性の増加を広く引き起こした.
- RPR,HID,GRIMが存在しない場合でも,DIAP1は細胞生存に不可欠でした.
結論:
- RPR,HID,GRIMは,IAP-カスパースの相互作用を妨害することによってアポトーシスを促進します.
- DIAP1は,アポトーシスを誘発するカスパース活性を抑制し,細胞の生存を確保するために不可欠です.
- RPR/HID/GRIMとDIAP1の相互作用は,ドロソフィラの発達における重要な規制メカニズムである.
関連する概念動画
Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Caspases
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 cells.
The 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...
The 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...
The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...

