口服によるビタミンB投与後,血管内皮機能の改善: プラズマの自由ホモシステイン濃度が低下することによって媒介される効果
J C Chambers1, P M Ueland, O A Obeid
1National Heart and Lung Institute, Imperial College School of Medicine, Hammersmith Hospital, London, UK.
Circulation
|November 15, 2000
まとめ
葉酸とビタミンB12を含むB族ビタミンサプリメントは,冠動脈性心疾患 (CHD) の患者の血管内皮機能を改善しました. この改善は,より低いフリープラズマホモシステインレベルと相関しており,心血管疾患のリスクが低下していることを示唆しています.
科学分野:
- 心血管医学は,心臓血管医学である.
- 栄養科学とは,栄養科学である.
- 血管生物学 血管生物学
背景:
- ハイパーホモシステイン血症は,冠動脈性心疾患 (CHD) の既知の危険因子です.
- ビタミンBサプリメントは,血のホモシステインレベルを下げることができます.
- CHD患者の血管機能に対するホモシステインの低下の影響は不明である.
研究 の 目的:
- 葉酸とビタミンB12のサプリメントが,心臓病の男性における血管内皮機能に与える影響を調査する.
- ビタミンB療法によって血ホモシステイン濃度が変化し,フロー媒介の膨張が改善されるかどうかを判断する.
主な方法:
- CHDの89人の男性は,葉酸 (5 mg) とビタミンB12 (1 mg) を1日1回,またはプラセボを8週間投与されました.
- 腕動脈の流れ媒介の膨張 (内皮質依存) とニトログリセリン誘発の膨張 (内皮質独立) を測定した.
- 血ホモシステイン,血葉酸,ビタミンB12のレベルは,治療開始時および治療後に評価されました.
主要な成果:
- ビタミンBの治療は,フローメディエーションによる膨張を有意に改善しました (2.5%から4.0%,P=0.002),而プラセボは変化を示しませんでした.
- ビタミン療法は,血のホモシステインの総量,タンパク質結合,および自由濃度を下げました.
- フローメディエーションによる拡張の改善は,プラズマの自由ホモシステインの減少と相関する (r=-0.26,P=0.001).
- ニトログリセリン誘発の膨張は変化せず,内皮に特異的な効果を示した.
結論:
- 葉酸とビタミンB12のサプリメントは,心血管疾患患者の血管内皮機能を強化します.
- この有益な効果は,フリーホモシステインの血濃度の低下によって媒介される可能性が高い.
- ビタミンBサプリメントによるホモシステインの低下は,心血管疾患のリスクを軽減する可能性があります.
関連する概念動画
Atherosclerosis III: Management
576
Management of atherosclerosis involves an integrated strategy encompassing pharmacological treatment, surgical interventions, lifestyle changes, and nutrition therapy to address the multifactorial nature of the disease.Pharmacological TherapyA cornerstone of atherosclerosis management is the use of pharmacological agents. Statins, such as atorvastatin, are pivotal in inhibiting HMG-CoA reductase, an enzyme that catalyzes an initial step in cholesterol synthesis in the liver. This reduction in...
576
Vitamins
2.9K
Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced...
2.9K
Antihypertensive Drugs: Vasodilators
2.5K
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...
2.5K
Role of Vitamins in Maintaining Bone Health
6.0K
The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
6.0K
Regulation of Angiogenesis and Blood Supply
3.9K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
3.9K
Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers
733
Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
733


