関連する実験動画
Updated: Jun 26, 2026

10:23
Evaluation of Caspase Activation to Assess Innate Immune Cell Death
Published on: January 20, 2023
HIN-200タンパク質は,異種の細胞質DNAへの反応としてカスパース活性化を調節する
Tara L Roberts1, Adi Idris, Jasmyn A Dunn
1The University of Queensland, Institute for Molecular Bioscience, QLD 4072, Australia.
まとめ
哺乳類の細胞にある外来DNAは,免疫反応を誘発する. HIN-200タンパク質p202はDNA誘発の細胞死を抑制し,AIM2はそれを促進し,先天的な免疫における役割を明らかにする.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
背景:
- 生まれながらの免疫系は,二重鎖DNA (dsDNA) を含む外来核酸を認識する.
- 細胞プラズマのdsDNA検出は,カスパース活性化によって抗ウイルス反応とマクロファージ細胞死を引き起こします.
研究 の 目的:
- HIN-200ファミリータンパク質がサイトプラズマ dsDNAを感知する役割を調査する.
- DNA誘発免疫反応におけるp202とAIM2の機能を明らかにする.
主な方法:
- 骨髄由来マクロファージを用いて,感染したdsDNAに対する反応を研究した.
- カスパース活性化におけるp202の機能を評価するために,ノックダウン研究を使用した.
- p202.2.のdsDNA結合特性を調査しました.
主要な成果:
- サイトプラズマのdsDNAは,カスパース3とカスパース1を迅速に活性化させました.
- p202は,DNA誘発のカスパース活性化を阻害するdsDNA結合タンパク質として特定されました.
- AIM2は,dsDNA誘発のカスパース活性化に不可欠であることが判明しました.
結論:
- p202 と AIM2 を含む HIN-200 タンパク質は,細胞質の dsDNA のパターン認識受容体として機能する.
- p202は阻害剤として作用し,AIM2はdsDNA感知経路の活性化剤として作用する.
- これらの発見は,外来DNAに対する先天的な免疫反応の分子メカニズムを明らかにしています.
関連する概念動画
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 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 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...
CRISPR and crRNAs
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
Apoptosis
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.
NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...

