子宮内成長制限後の青春期の末期の血管成長障害
J Brodszki1, T Länne, K Marsál
1Department of Obstetrics and Gynecology, University Hospital of Lund, Lund, Sweden. jana.brodszki@gyn.lu.se
Circulation
|May 11, 2005
まとめ
異常な血流を有する胎児における子宮内成長制限 (IUGR) は,青春期のより小さな血管とより高い心拍数に関連しています. これらの血管の変化は,成人における長期的な心血管健康に影響を与える可能性があります.
科学分野:
- 心血管生理学 心血管の生理学
- 胎児の発達について
- 血管生物学 血管生物学
背景:
- 子宮内成長制限 (IUGR) は,妊娠年齢に対して小さい胎児における胎児の異常な血流によって診断されます.
- 以前の研究は,IUGRの潜在的な長期的な健康上の影響を示唆しています.
研究 の 目的:
- 胎児の異常な血流によるIUGRが,青春期に続く異常な血管形態と機能と関連しているかどうかを調査する.
主な方法:
- 前向きの研究では,IUGRと胎児大動脈血流の異常が既往歴のある若者および未経験の若者におけるエコー・トラッキング・ソノグラフィを用いて,血管の機械的性質 (一般的な大動脈,腹部大動脈,ポップリテアル大動脈) を評価した.
- 腕動脈の内皮依存および内皮依存の血管拡張は,高解像度超音波で測定されました.
主要な成果:
- IUGRを患った青年は,対照群と比較して,腹部大動脈とポプリテアル動脈の末端ダイアストリック血管直径が著しく小さかった.
- IUGRグループでは,より小さな常軌動脈の大きさの傾向が観察されました.
- IUGRグループは休息時の心拍数が高かったが,動脈の硬さや血管拡張の有意な違いは見つかりませんでした.
結論:
- 胎盤不全に起因するIUGRは,若い成人期に続く血管成長障害と関連しています.
- 観察された小動脈のサイズと,IUGRの病歴のある青少年における休息時の心拍数上昇は,将来の心血管健康に影響を及ぼす可能性があります.
関連する概念動画
Mechanism of Angiogenesis
Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
Regulation of Angiogenesis and Blood Supply
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 hydroxylase and factor...
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...
Development of Blood Vessels
The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
Signs of Puberty
Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...


