関連する実験動画
Updated: Apr 30, 2026

08:02
Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice
Published on: October 20, 2013
18.0K
慢性的な帯圧迫後の急性低酸素期における帯血流の改善:窒素酸化物の役割
David S Gardner1, Dino A Giussani
1Department of Physiology, University of Cambridge, Downing St, Cambridge, CB2 3EG, UK. david.gardner@nottingham.ac.uk
Circulation
|July 2, 2003
まとめ
胎児の羊における胎前帯圧縮は,酸化窒素 (NO) の活性を増大させる. これは,低酸素期における帯血流を高め,出産中の胎児防衛戦略の転換を示唆する.
科学分野:
- 胎児生理学 胎児生理学
- 心血管研究 循環器科の研究
- 新生児医学 新生児医学
背景:
- 産内発症は,出産前の妥協が胎児の出産への反応に影響を与えることから生じる可能性があります.
- 胎児の羊の帯圧縮は,酸化窒素 (NO) の活性を高め,低酸素期における股関節血管収縮を抑制する.
- この研究では,胎児の循環がを圧縮した後の低酸素症への反応におけるNOの役割を調査しています.
研究 の 目的:
- 胎児の上昇したNO活動が,循環における低酸素期における血管拡張を増加させるかどうかを調査する.
- 妊娠前の帯圧縮が,急性低酸素症に対する胎児の循環反応に与える影響を判断する.
主な方法:
- 15頭の胎児の羊を血管カテーテルと管流量探知器で慢性的に計測した.
- 8人の胎児で3日間,帯血流の30%の減少を誘導し,7人が対照として使用した.
- 塩素またはNO合成阻害/血管拡張治療の圧縮後の急性低酸素症への曝露.
主要な成果:
- 帯圧縮は,その後の急性低酸素症の間,帯高血症を著しく増加させた.
- この増強は,酸化窒素 (NO) に依存するメカニズムによって媒介された.
- NOの活性が上昇すると,胎児の循環に逆効果が示され,低酸素期には収縮または膨張する.
結論:
- 産前妥協は,低酸素症の管理のために胎児の戦略を血管収縮からNO依存の血管拡張にシフトさせます.
- この適応的反応は,出産に関連した低血圧的出来事に耐えるために決定的かもしれません.
- 発見は,胎児のストレスへの適応におけるNOの複雑な役割を強調しています.
さらに関連する動画
関連する概念動画
Regulation of Angiogenesis and Blood Supply
2.9K
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...
2.9K
Nitric Oxide Signaling Pathway
5.3K
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...
5.3K
Autoregulation of Blood Flow
10.0K
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....
10.0K
Fetal Circulation
5.0K
Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
5.0K
Oxygen Transport in the Blood
7.9K
Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
7.9K

