Two critical events in the development of the vascular system: pruning and remodeling

Domenico Ribatti1

  • 1Department of Translational Biomedicine and Neuroscience, University of Bari, Bari, Italy. domenico.ribatti@uniba.it.

Insights

Embryonic cardiovascular development involves forming blood vessels via vasculogenesis and angiogenesis. This is followed by essential pruning and remodeling, where some vessels stabilize and others regress during organogenesis.

Area of Science:

  • Developmental biology
  • Cardiovascular science
  • Embryology

Background:

  • The cardiovascular system is the first functional organ system to develop in vertebrate embryos.
  • Primitive heart and vascular plexus formation occur through vasculogenesis and angiogenesis.

Purpose of the Study:

  • To describe common pruning and remodeling processes in cardiovascular development.
  • To detail these processes during organogenesis in experimental and human systems.

Main Methods:

  • Review of established literature on embryonic cardiovascular development.
  • Analysis of common pruning and remodeling forms observed during organogenesis.

Main Results:

  • Vasculogenesis and angiogenesis establish the initial vascular network.
  • Post-formation, vascular networks undergo significant pruning and remodeling.
  • Some vascular branches stabilize, while others regress, shaping the final cardiovascular system.

Conclusions:

  • Pruning and remodeling are critical, highly regulated processes in cardiovascular organogenesis.
  • Understanding these mechanisms is vital for studying congenital heart defects and vascular diseases.

Related Concept Videos

Development of Blood Vessels01:07

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...
1.4K
Mechanism of Angiogenesis01:10

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...
6.7K
Regulation of Angiogenesis and Blood Supply01:24

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...
3.3K
Overview of the Vascular System01:20

Overview of the Vascular System

The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
3.4K
Vascular Spasm01:16

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...
3.4K
Meristems and Plant Growth02:36

Meristems and Plant Growth

Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
49.1K