関連する実験動画
Updated: May 13, 2026

07:08
Fractionation for Resolution of Soluble and Insoluble Huntingtin Species
Published on: February 27, 2018
アセチル化により,突然変異したハンティングチンは,分解のためにオートファゴソームに標的にされます
Hyunkyung Jeong1, Florian Then, Thomas J Melia
1Department of Neurology, Massachusetts General Hospital, Harvard Medical School, MassGeneral Institute for Neurodegeneration, Charlestown, MA 02129, USA.
Cell
|April 7, 2009
まとめ
K444における変異ハンティングチンタンパク質のアセチル化は,オートファギーの経由でそのクリアランスを強化し,ハンティントン病のモデルにおける有毒効果を逆転させます. この改変は,神経変性障害の予防に極めて重要です.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- ハンチントン病 (HD) は致命的な神経変性疾患である.
- ニューロンに突然変異したハンティングチンタンパク質 (Htt) の蓄積が特徴です.
- 変異性Httのクリアランスの強化は,HDの治療目標である.
研究 の 目的:
- 変異したHttのクリアランスにおける翻訳後の改変の役割を調査する.
- Httのアセチル化により,Httの分解が容易になるかどうかを判断する.
- ハンチントン病の治療戦略としてアセチル化を調査する.
主な方法:
- リスイン残留444 (K444) のアセチル化がHtt.に与える影響を研究した.
- プライマリニューロン培養 (striatalとcortical) とHDのトランスジェニックC. elegansモデルを使用した.
- Httの集積,オートファゴソームへの密輸,マクロオートファギーによるクリアランスを評価した.
- アセチル化および非アセチル化Htt.に対する反応として研究された神経変性.
主要な成果:
- K444でのHttのアセチル化により,マクロオートファギーの経由でHttのクリアランスが著しく増加します.
- 増加したK444アセチル化により,突然変異のHttがオートファゴソームに密輸されやすくなります.
- アセチル化に抵抗する変異性Httが蓄積され,神経細胞培養とマウスモデルで神経変性が生じます.
- アセチル化により,HDモデルにおける変異したHttの毒性効果が逆転した.
結論:
- アセチル化は,ハンティントン病の累積された変異性Httをクリアするための重要なメカニズムです.
- Httアセチル化をターゲットにすることで,オートファギーの経由で分解を促進し,潜在的な治療手段を提供することができます.
- この研究は,自滅性分解のためのタンパク質を標的としたアセチル化のより広範な役割を強調しています.
さらに関連する動画
関連する概念動画
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Delivery Pathways to the Lysosome
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Autophagy
Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
Export of Misfolded Proteins out of the ER
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
Huntington Disease l: Introduction
Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...

