関連する実験動画
Updated: Jun 6, 2026
07:23
Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury
Published on: March 7, 2022
サイレント・インフォメーション・レギュレータ1は,心臓をイシュケミア/再輸血から保護する
Chiao-Po Hsu1, Peiyong Zhai, Takanobu Yamamoto
1Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, University of Medicine and Dentistry of New Jersey, Newark, 07103, USA.
Circulation
|November 10, 2010
まとめ
サイレント・インフォメーション・レギュレータ1 (Sirt1) は,心臓をイシュケミア/再注射 (I/R) 損傷から保護する. Upregulating Sirt1は,保護遺伝子を活性化し,細胞死経路を阻害することによって,心臓損傷と酸化ストレスを軽減します.
科学分野:
- 心血管生物学 心血管生物学
- 分子心臓病学 分子心臓病学
- バイオケミストリー バイオケミストリー
背景:
- サイレント・インフォメーション・レギュレータ1 (Sirt1) はヒストン脱酸化酵素で,老化を遅らせ,酸化ストレスから保護することが知られている.
- 循環器疾患における重大な状態である心筋不全/再注射 (I/R) 損傷におけるその役割が調査されました.
研究 の 目的:
- Sirt1が心筋動脈不全/再注射 (I/R) 損傷に対する保護を与えるかどうかを判断する.
- 心臓におけるSirt1の潜在的な保護効果の基礎となる分子メカニズムを解明する.
主な方法:
- 心臓特異的なSirt1ノックアウトとトランスジェニック過剰発現マウスモデルを使用しました.
- 評価された心筋梗塞のサイズ,アポトーシスマーカー (TUNL染色),およびI/R後の心臓機能.
- 主要なプロ生存およびプロアポプトティック分子の表現を分析した.
- Sirt1媒介による保護におけるFoxO1転写因子の役割を調査した.
主要な成果:
- 心臓におけるSirt1発現が著しく低下した.
- Sirt1ノックアウトマウスは,対照群と比較して,心臓発作のサイズが増加した (44%対15%).
- Sirt1の過剰発現は,心臓発作のサイズ (15%対36%) とアポトーシスを減少させた.
- Sirt1は心臓機能の回復を向上させ,抗酸化酵素 (マングネス・スーパーオキシド・ディスミュータゼ,チオレドキシン-1) とBcl-xLを上位に調節し,バックスとカスパース-3を下位に調節し,カスパース-3を分裂させた.
- FoxO1のSirt1活性化は,抗酸化物質の調節を向上させ,酸化的ストレスを軽減するために不可欠でした.
結論:
- Sirt1は,心筋のI/R損傷に対する重要な保護作用を示しています.
- 保護は,FoxO1の活性化による抗酸化防御を上調し,プロアポプトシス要因を下調することによって媒介されます.
- Sirt1の活性化により,I/Rイベント中に心筋細胞の酸化ストレスが低下します.
関連する概念動画
01:17Ischemic Heart Disease: Overview
Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
Atherosclerosis, the primary malefactor, orchestrates this dangerous condition. It manifests as the accumulation of fatty deposits, akin to insidious plaques, within arterial walls. As time elapses, these plaques metamorphose, hardening and narrowing...
Atherosclerosis, the primary malefactor, orchestrates this dangerous condition. It manifests as the accumulation of fatty deposits, akin to insidious plaques, within arterial walls. As time elapses, these plaques metamorphose, hardening and narrowing...
01:31Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
01:31Regulation of Heart Rates
The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
01:27Regulation of Stroke Volume
The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
01:27Regulation of the Cardiovascular System
The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...