アンジオテンシンII誘発によるCHK1のセルリン-280へのリン酸化は,JAK1の直接リン酸化によって心臓のリモデリングを促し,マウンの心筋細胞におけるJAK1-STATのシグナリングを活性化させる
Zheng Xu1,2, Yihan Shen2, Xiaoting Luo3
1Heart Center, Department of Cardiovascular Medicine, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, China.
British journal of pharmacology
|August 24, 2025
まとめ
チェックポイントキナーゼ1 (CHK1) の活性化は,JAK1-STAT3経路経由で心臓の改造を誘発する. CHK1を阻害することは 心不全の潜在的な治療法です
科学分野:
- 心血管生物学
- 分子心臓科
- 細胞シグナリング
背景:
- 心臓の改造は心臓病の主要な要因です
- チェックポイントキナーゼ1 (CHK1) はDNA損傷反応において極めて重要であるが,心臓の改造におけるその役割は不明である.
- アンジオテンシンIIは心臓の改造をモデル化するために使用されます.
研究 の 目的:
- 心臓の改造におけるCHK1の活性化を研究する.
- アンジオテンシンII誘発の心臓改造におけるCHK1の役割と下流経路を決定する.
- 治療戦略としてCHK1抑制を評価する.
主な方法:
- CHK1基質を特定するための共免疫降水と質量スペクトロメトリー (Co-IP/MS)
- 実験室内 (ネズミの新生児心筋細胞) と体内 (マウスモデル) の研究
- CHK1阻害剤CCT245737とJAK1阻害剤ウパダシチニブによる薬理学的抑制
主要な成果:
- 心筋細胞におけるS280で選択的にリン酸化されたCHK1.
- CHK1抑制により,アンジオテンシンII誘発の心筋細胞高縮が抑制された.
- JAK1は,JAK1- STAT3シグナル活性化を媒介するCHK1基質として識別された.
- CHK1またはJAK1の阻害は,マウスの心臓の改造と機能障害を逆転させた.
結論:
- CHK1 S280のリン酸化は,アンジオテンシンII誘発の心臓再構成の重要な媒介である.
- この過程で,JAK1-STAT3経路はCHK1によって活性化されます.
- CHK1を標的とした治療は高血圧性心不全の有望な治療法である.
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...
G-Protein Gated Ion Channels
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Sensory organs,...
Transducer Mechanism: Enzyme-Linked Receptors
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
Myocarditis I: Introduction
Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...


