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Antihypertensive Drugs: Action of β1 Blockers01:17

Antihypertensive Drugs: Action of β1 Blockers

β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this, β1-blockers...
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

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: Angiotensin II Receptor Blockers01:30

Antihypertensive Drugs: Angiotensin II Receptor Blockers

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...
Antihypertensive Drugs: Direct Renin Inhibitors01:25

Antihypertensive Drugs: Direct Renin Inhibitors

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,...
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

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...
Antianginal Drugs: Nitrates and β-Blockers01:16

Antianginal Drugs: Nitrates and β-Blockers

In cardiovascular health, antianginal drugs combat angina pectoris — a condition marked by chest pain owing to diminished blood flow to the heart.
Organic nitrates,  such as nitroglycerin, play a pivotal role. Once metabolized, they liberate nitric oxide, a molecular marvel. Nitric oxide triggers guanylyl cyclase and augments cGMP production. This biochemical cascade orchestrates the relaxation of vascular smooth muscles, ushering in vasodilation and enhancing coronary blood flow. Administered...

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関連する実験動画

Updated: Jul 20, 2026

Subcutaneous Angiotensin II Infusion using Osmotic Pumps Induces Aortic Aneurysms in Mice
07:21

Subcutaneous Angiotensin II Infusion using Osmotic Pumps Induces Aortic Aneurysms in Mice

Published on: September 28, 2015

スタチンに敏感なAT1受容体の機能と密度が調節不良で,高コレステロール血症の男性におけるAT1受容体の機能と密度が調節不良である.

G Nickenig1, A T Bäumer, Y Temur

  • 1Klinik III für Innere Medizin, Universität Köln, Germany. georg.nickenig@uni-koeln.de

Circulation
|November 26, 1999
PubMed
まとめ

男性の高コレステロールは,アンジオテンシンII型1受容体発現と血圧応答を増加させる. スタチンは,この受容体発現を効果的に低下させ,血圧を改善し,新しい治療法を提供します.

さらに関連する動画

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
12:03

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors

Published on: June 7, 2016

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension
05:57

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension

Published on: May 17, 2024

関連する実験動画

Last Updated: Jul 20, 2026

Subcutaneous Angiotensin II Infusion using Osmotic Pumps Induces Aortic Aneurysms in Mice
07:21

Subcutaneous Angiotensin II Infusion using Osmotic Pumps Induces Aortic Aneurysms in Mice

Published on: September 28, 2015

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
12:03

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors

Published on: June 7, 2016

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension
05:57

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension

Published on: May 17, 2024

科学分野:

  • 心血管科学 心血管科学
  • エンドクリノロジー エンドクリノロジー
  • 薬理学 薬理学とは

背景:

  • 高コレステロール血症は,血管のアンジオテンシンII型1 (AT1) 受容体発現の増加と関連しています.
  • 以前の研究では,細胞培養と動物モデルでこの効果が示されました.

研究 の 目的:

  • 高コレステロール血症の男性におけるAT1受容体の過剰発現を調査する.
  • AT1受容体発現と機能に対するHMG CoA還元酵素阻害剤 (スタチン) の治療効果を評価する.

主な方法:

  • ノルモコレステロール血症および高コレステロール血症の男性におけるアンジオテンシンII輸注に対する血圧反応の評価.
  • 単離された血小板のAT1受容体発現を測定した.
  • スタチン治療前・後の患者さんの評価.

主要な成果:

  • 高コレステロール血症は,アンジオテンシンII誘発の血圧上昇を著しく増加させた.
  • AT1受容体発現は,高コレステロール血症の個体において有意に高かった.
  • スタチンの治療は,高血圧反応を逆転させ,AT1受容体の密度を低下させました.

結論:

  • 高コレステロール血症はAT1受容体の過剰発現を誘発し,男性ではアンジオテンシンIIの効果を高めます.
  • 発見は高血圧と動脈硬化症の病原性についての洞察を提供します.
  • AT1受容体を標的とした新しい治療戦略の可能性を示唆しています.