p35からp25への変換は,Cdk5の活性を解除し,神経変性を促進します
G N Patrick1, L Zukerberg, M Nikolic
1Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|December 22, 1999
まとめ
切断されたタンパク質であるp25が,アルツハイマー病の脳に蓄積され,Cdk5の活性が増加します. これはタウの高酸化,細胞骨格の損傷,神経死につながるため,神経変性における役割を示唆する.
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.
- 細胞生物学 細胞生物学
背景:
- サイクリン依存キナーゼ5 (Cdk5) は,哺乳類の中央神経系の発達に不可欠です.
- Cdk5の活性化には,その調節サブユニット,p35.5との結合が必要です.
研究 の 目的:
- アルツハイマー病の病原性における切断されたp35タンパク質,p25の役割を調査する.
- Cdk5活動とニューロン機能に対するp25蓄積の影響を決定する.
主な方法:
- アルツハイマー病患者の脳組織の分析.
- Cdk5キナーゼ活性を測定するための生化学分析.
- 細胞培養実験で,p25/Cdk5複合体の効果を研究する.
主要な成果:
- p25は,アルツハイマー病の脳内のニューロンに蓄積され,Cdk5の活性増加と相関する.
- Cdk5へのp25結合は,構成的活性化,細胞の局所化変化,および基板特異性につながる.
- p25/Cdk5複合体はタウを高酸化し,微小管を不安定化し,神経変性およびアポトーシスをインビトロで誘発する.
結論:
- p25を形成するためにp35の割れ方とその後の蓄積は,アルツハイマー病の細胞骨格異常とニューロン死亡に寄与する可能性があります.
- 異常なp25/Cdk5複合体は,神経変性疾患の病原性に関与している.
関連する概念動画
01:23Negative 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.
02:34Inhibition 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...
02:15M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
02:23Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
02:34Inhibition 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...
02:15M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...