ウビキチンヒドロラーゼUch-L1は,ベータアミロイド誘発によるシナプス機能と文脈的記憶の低下を救済する
Bing Gong1, Zixuan Cao, Ping Zheng
1Department of Pathology and Taub Institute, Columbia University, New York, NY 10032, USA.
Cell
|August 23, 2006
まとめ
ウビキチンC末端ヒドロラーゼL1 (Uch-L1) は,認知機能とシナプス体の健康に不可欠です. アルツハイマー病におけるUch-L1の活性回復
科学分野:
- 神経科学は神経科学である.
- 分子生物学は分子生物学である.
- 神経変性疾患 神経変性疾患とは
背景:
- ニューロンのユビキチン/プロテアソーマ系は,アルツハイマー病 (AD) の病原性に関与している.
- ウビキチンC末端ヒドロラーゼL1 (Uch-L1) は,シナプスおよび認知機能の維持に重要な役割を果たします.
研究 の 目的:
- シナプスおよび認知機能におけるUch-L1の役割を調査する.
- アルツハイマー病のモデルにおけるUch-L1タンパク質伝導の治療の可能性を評価する.
主な方法:
- オリゴメリックアミロイドβ (Abeta) で処理されたヒポカンプス切片を使用した.
- アルツハイマー病のAPP/PS1トランスジェニックマウスモデルを使用した.
- 投与されたUch-L1タンパク質は,HIVトランザクティベータータンパク質 (TAT) 変換領域と融合した.
主要な成果:
- Uch-L1-TAT融合タンパク質のトランスデュークションにより,アベタ処理したスライスで酵素活性とシナプス機能が回復しました.
- Uch-L1-TATの腹腔内注射は,APP/PS1マウスにおける文脈学習記憶を改善しました.
- 回復したPKA調節サブユニットIIalpha,PKA活性,CREBリン酸化と相関する有益な効果.
結論:
- Uch-L1は,正常なシナプスおよび認知機能に不可欠です.
- Uch-L1タンパク質伝導は,アルツハイマー病に対する有望な治療戦略を表しています.
- このメカニズムは,PKAとCREBを含む重要なシグナル伝達経路の回復を伴う.
関連する概念動画
Lysosomal Hydrolases
3.5K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.5K
The Unfolded Protein Response
5.6K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
5.6K
Export of Misfolded Proteins out of the ER
4.3K
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...
4.3K
Alzheimer Disease ll: Pathophysiology
35
Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
35
Dementia l: Introduction
35
Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
35


