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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Nitric Oxide Signaling Pathway01:28

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 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: Vasodilators01:23

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...
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: May 14, 2026

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
08:58

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries

Published on: February 25, 2016

ヒドロキシメチルグルタリル共酵素A還元酵素の阻害は,カベオリン (caveolin) の豊富さの低下を通じた内皮酸化窒素合成酵素の活性化を促進する.

O Feron1, C Dessy, J P Desager

  • 1Department of Medicine, Unit of Pharmacology and Therapeutics, University of Louvain Medical School, Brussels, Belgium.

Circulation
|January 4, 2001
PubMed
まとめ
この要約は機械生成です。

アトルバスタチンは,内皮細胞内のカベオリン-1を減少させ,酸化窒素 (NO) の生成を改善します. このコレステロールを下げる効果は,高コレステロール血症の内皮機能不全を修正するのに役立ちます.

さらに関連する動画

Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements
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Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements

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Measurement of Cyclic Guanosine Monophosphate (cGMP) in Solid Tissues using Competitive Enzyme-Linked Immunosorbent Assay (ELISA)
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Measurement of Cyclic Guanosine Monophosphate (cGMP) in Solid Tissues using Competitive Enzyme-Linked Immunosorbent Assay (ELISA)

Published on: July 3, 2025

関連する実験動画

Last Updated: May 14, 2026

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
08:58

En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries

Published on: February 25, 2016

Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements
07:19

Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements

Published on: July 29, 2021

Measurement of Cyclic Guanosine Monophosphate (cGMP) in Solid Tissues using Competitive Enzyme-Linked Immunosorbent Assay (ELISA)
07:15

Measurement of Cyclic Guanosine Monophosphate (cGMP) in Solid Tissues using Competitive Enzyme-Linked Immunosorbent Assay (ELISA)

Published on: July 3, 2025

科学分野:

  • 心血管科学 心血管科学
  • 分子生物学は分子生物学である.
  • 薬理学 薬理学とは

背景:

  • 高コレステロール血症は,内皮中の酸化窒素 (NO) に依存する血管拡張を損なう.
  • 内皮細胞のコレステロールが上昇すると,カベオリン-1が増加し,内皮NO合成酵素 (eNOS) との阻害複合体を安定させ,NOの放出を減少させます.

研究 の 目的:

  • アトルバスタチンが,細胞のコレステロールを低下させ,カベオリン濃度,eNOS活性,NO放出を調節するかどうかを調査する.

主な方法:

  • 内皮細胞は,LDLコレステロールとまたはそれなしのアトルバスタチンのさまざまな用量で治療されました.
  • カベオリン-1とeNOSの相互作用,eNOSの活性,eNOSとHsp90との関連を評価した.

主要な成果:

  • アトルバスタチンは,LDLコレステロールレベルに関係なく,カヴェオリン-1発現を著しく低下させた.
  • この減少は,カベオリン-1/eNOS阻害の低下と,回復/強化されたeNOS活性をもたらした.
  • アトルバスタチンは,eNOS/Hsp90の相互作用を促進し,eNOSの活性化をさらに強化しました.

結論:

  • アトルバスタチンは,カベオリン-1発現を減少させることで,内皮細胞のNO産生を高めます.
  • コレステロール合成を阻害することは,高コレステロール血症における内皮機能不全の治療戦略を提供します.