エンドセリウム由来のリラックスファクターの抑制は,エンドセリン媒介の血管収縮を高めます
A Lerman1, E K Sandok, F L Hildebrand
1Department of Internal Medicine, Mayo Clinic and Foundation, Rochester, Minn. 55905.
Circulation
|May 11, 1992
まとめ
内皮由来リラックス因子 (EDRF) を阻害すると,内皮素 (ET) の血管圧縮効果が著しく増幅されます. これは,血管トーンを調節するこれらの要因の間の重要なバランスを強調しています.
科学分野:
- 心血管生理学 心血管の生理学
- 内皮機能の機能について
- 血管生物学 血管生物学
背景:
- 内皮は,EDRFのような血管拡張剤や,ETのような血管収縮剤を通じて血管調節をします.
- 内皮機能不全は心血管疾患と関連しており,高いETレベルが観察されています.
- EDRFとETの不均衡は,疾患状態における血管トーンを変化させる可能性があります.
研究 の 目的:
- 固有のEDRFを阻害することで,高濃度のETによって誘発される血管収縮が強化されるという仮説を検証する.
- 血管トーンを調節するEDRFとETの相互作用を調査する.
主な方法:
- 麻酔を受けた犬を3グループに分けて実験を行った.
- グループ1:ET-1を注入して,循環中のET濃度を2倍にする.
- グループ2:EDRF阻害剤であるETとNG-モノメチルL-アルギニン (L-NMMA) の併用.
- グループ3:単独のL-NMMAの連続注入.
主要な成果:
- 血のET濃度が2倍に上昇すると,全身および腎臓の血管収縮が起こりました.
- EDRFの阻害は,全身,肺,冠動脈,腎臓の循環を通じてET誘発の血管収縮を著しく強化しました.
結論:
- 固有のEDRFの阻害は,ETの血管圧縮作用を強化する.
- これは,血管調節における内皮血管拡張および血管収縮因子のバランスのために重要な役割を果たしています.
関連する概念動画
Nitric Oxide Signaling Pathway
Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
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...
Antihypertensive Drugs: Vasodilators
Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
Vascular Spasm
The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Structure of Blood Vessels
Blood is circulated throughout the human body through a network of blood vessels called the circulatory system. This system includes arteries that transport blood from the heart to various body parts. These arterial pathways divide into smaller vessels until they reach the arterioles, which further split into capillaries. It is within these minuscule capillaries that the exchange of nutrients and waste products takes place. After this exchange, the blood is collected by venules, which fuse to...
Autoregulation of Blood Flow
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.


