Video Experimental Relacionado
Updated: Jul 12, 2026
11:00
Generation and Culture of Blood Outgrowth Endothelial Cells from Human Peripheral Blood
Published on: December 23, 2015
Las fases dependientes de la angiogénesis y las independientes de la hiperplasia íntima
Rohit Khurana1, Zhenwu Zhuang, Shalini Bhardwaj
1Centre for Cardiovascular Biology and Medicine, Department of Medicine, University College, London, UK.
Circulation
|October 13, 2004
Resumen
La angiogénesis adventitial estimula el engrosamiento íntimo, un factor clave en las enfermedades vasculares como la aterosclerosis y la restenosis. Sin embargo, este proceso no inicia el engrosamiento en sí.
Área de la Ciencia:
- Biología Vascular Biología Vascular
- Investigación Cardiovascular Investigación Cardiovascular Investigación Cardiovascular Investigación Cardiovascular Investigación Cardiovascular
- La Medicina Regenerativa es una Medicina Regenerativa.
Sus antecedentes:
- La proliferación de células vasculares lisas vasculares (VSMC) neointimales impulsa las enfermedades vasculares oclusivas como la aterosclerosis y la restenosis.
- Si bien la angiogénesis está relacionada con el ateroma temprano, su papel en la proliferación de VSMC sigue sin estar claro.
- Las intervenciones coronarias percutáneas pueden inducir la angiogénesis periadvental, lo que lleva a investigar su papel en la formación de neointima.
Objetivo del estudio:
- Para investigar el papel de la angiogénesis periadvental en la formación de neointima después de una lesión arterial.
- Para determinar si la estimulación o inhibición de la angiogénesis afecta el engrosamiento neointimal.
Principales métodos:
- Se utilizaron dos modelos animales de lesión arterial para inducir la angiogénesis periadvental y la formación de neointima.
- La angiogénesis se estimuló utilizando el factor de crecimiento endotelial vascular (VEGF-A165) o el péptido PR39.
- La angiogénesis fue inhibida utilizando el receptor soluble de VEGF 1 (sFlt1) o el receptor dominante negativo de FGF 1 (FGF-R1DN).
Principales resultados:
- La lesión arterial indujo tanto la angiogénesis periadvental como la formación de neointima.
- La estimulación de la angiogénesis con VEGF-A165 o PR39 aumentó significativamente el engrosamiento neointimal.
- La inhibición de la señalización VEGF o FGF redujo el engrosamiento impulsado por la angiogénesis, pero no impidió el engrosamiento después de la lesión por sí solo.
- Los inhibidores fueron ineficaces para prevenir el engrosamiento neointimal sin factores de crecimiento angiogénico.
Conclusiones:
- La angiogénesis adventitial actúa como un estímulo para el engrosamiento íntimo.
- La angiogénesis no inicia el proceso de engrosamiento íntimo; otros factores están involucrados en su iniciación.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:10Mechanism 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...
01:24Regulation 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...
01:16Vascular 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...
01:15Structure 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...
01:17Autoregulation of Blood Flow
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.
01:07Development 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...