関連する実験動画
Updated: Jun 23, 2026

06:09
Assaying the Kinase Activity of LRRK2 in vitro
Published on: January 18, 2012
スタチンはAMP活性化タンパク質キナーゼをインビトロおよびインビボで活性化します
Wei Sun1, Tzong-Shyuan Lee, Minjia Zhu
1Division of Biomedical Sciences, University of California, Riverside, Riverside, CA 92521-0121, USA.
Circulation
|November 23, 2006
まとめ
スタチンはAMP活性化タンパク質キナーゼ (AMPK) を活性化させ,内皮酸化窒素合成酵素 (eNOS) の活性性を高めます. このAMPK活性化が,酸化窒素の産生と血管新生を促進することによって,スタチンの心血管上の利点を説明しています.
科学分野:
- 心血管薬理学について
- 分子生物学は分子生物学である.
- 細胞の代謝について
背景:
- スタチンは,部分的に酸化窒素 (NO) の生物利用性を高めることによって,心血管の利点を提供しています.
- AMP活性化タンパク質キナーゼ (AMPK) は,細胞のエネルギーと代謝に不可欠です.
- スタチン,AMPK活性化,および内皮 NO 合成酵素 (eNOS) 経由の NO 生成の関係については,解明が必要である.
研究 の 目的:
- スタチンがAMPKを活性化するかどうかを調査する.
- 活性化されたAMPKがENOSを通じてNOの産生と血管新生を調節するかどうかを判断する.
- スタチンの心血管性プレイオトロプ効果の背後にあるメカニズムを探求する.
主な方法:
- 人間の静脈内皮細胞は,アトルバスタチンで治療されました.
- ウェスタン・ブロッティングとSAMSアッセイでは,AMPKとそのターゲットリン酸化を評価した.
- 抑制試験では,支配的陰性AMPK (Ad-AMPK-DN) と化合物Cを用いた.
- In vivo研究では,アトルバスタチンをマウスに投与した.
主要な成果:
- アトルバスタチンは,AMPKのリン酸化と内皮細胞の活性を,投与量と時間によって増加させた.
- AMPKの活性化は,アセチル-CoAカルボキシラーゼとENOSのリン酸化につながった.
- AMPKの抑制は,アトルバスタチン誘発のNO生成,cGMPの蓄積,および血管新生を阻害しました.
- vivoでは,アトルバスタチンはマウスの大動脈と心筋にAMPK,ACC,eNOSのリン酸化を増加させた.
結論:
- スタチンは,Thr-172のリン酸化により,AMPKを迅速に活性化させ,in vitroとin vivoの両方で活性化します.
- この活性化により,eNOSが刺激され,NOの生産が増加します.
- スタチンによるAMPK活性化は,心血管保護効果のための新しいメカニズムを提供します.
関連する概念動画
Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
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...
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Lipid-Lowering Drugs: Statins and Miscellaneous Agents
Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...

