アンジオテンシン変換酵素2は,病理的な高縮,心筋線維症,心機能不全を抑制する
JiuChang Zhong1, Ratnadeep Basu, Danny Guo
1Division of Cardiology, Department of Medicine, Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, T6G 2S2, Canada.
Circulation
|August 4, 2010
まとめ
アンジオテンシン変換酵素2 (ACE2) は,アンジオテンシンII (Ang II) の負の調節によって心臓を保護します. リコンビナントヒトACE2 (rhACE2) 治療は,Ang II誘発の心臓病と不良心改造を弱めた.
科学分野:
- 心血管科学 心血管科学
- 酵素学 酵素学とは
- 分子生物学は分子生物学である.
背景:
- アンジオテンシン変換酵素2 (ACE2) は,ペプチド基板を代謝する酵素です.
- ACE2は,アンジオテンシンII (Ang II) 媒介のシグナル伝達とその心血管効果を否定的に調節すると仮定されています.
研究 の 目的:
- Ang II誘発の心血管損傷の負の調節体としてのACE2の役割を調査する.
- 再結合ヒトACE2 (rhACE2) の治療の可能性を評価し,Ang II媒介の心臓病を緩和する.
主な方法:
- 利用されたACE2ノックアウト (Ace2(-/y)) と野生型 (WT) のマウスは,Ang II注入を受けた.
- Ang IIを注入したWTマウスに rhACE2を投与し,心臓の構造,機能,分子マーカーを評価した.
- rhACE2が単離された心筋細胞と心筋線維芽細胞に与える影響を研究した.
主要な成果:
- ACE2欠乏症は,Ang II誘発の心筋線維症と縮を悪化させた.
- rhACE2治療は,Ang II誘発の心筋縮,線維症,および透析機能不全を鈍化させた.
- rhACE2は,Ang II媒介の超酸化物生成と主要なシグナル伝達経路 (PKC,ERK,JAK2,STAT3) を抑制しました.
- rhACE2は,圧力過負荷のマウスの拡張性心筋症を部分的に予防しました.
結論:
- ACE2は,Ang II誘発の心臓病の重要な負の調節剤として作用する.
- rhACE2は,Ang IIと圧力過負荷によって引き起こされる有害な心筋リモデリングを効果的に緩和します.
- ACE2欠乏症は,Ang II誘発の心血管疾患を悪化させ,その保護的役割を強調する.
関連する概念動画
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
2.7K
Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
2.7K
Antihypertensive Drugs: Angiotensin II Receptor Blockers
2.9K
In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
2.9K
Antihypertensive Drugs: Direct Renin Inhibitors
1.9K
The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
1.9K
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
1.9K
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...
1.9K
Heart Failure II: Pathophysiology
1.9K
Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
1.9K
Hypertension II: Pathophysiology
1.8K
Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
1.8K


