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Mechanism of Angiogenesis

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

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...

Structure and Function of Platelets

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Formation of the Platelet Plug

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.

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Related Experiment Video

Updated: Jul 17, 2026

Isolation of Endothelial Progenitor Cells from Healthy Volunteers and Their Migratory Potential Influenced by Serum Samples After Cardiac Surgery

Isolation of Endothelial Progenitor Cells from Healthy Volunteers and Their Migratory Potential Influenced by Serum Samples After Cardiac Surgery

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Platelet-derived microparticles induce angiogenesis and stimulate post-ischemic revascularization.

Alexander Brill¹, Olga Dashevsky, Julia Rivo

¹Coagulation Unit, Hematology Department, Hadassah Hebrew University Medical Center, Jerusalem 91120, Israel. brilla@hadassah.org.il

Cardiovascular Research

|May 10, 2005

Summary

Platelet-derived microparticles (PMP) promote new blood vessel growth (angiogenesis) in laboratory models and in animals with heart ischemia. PMP may improve revascularization in ischemic conditions.

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Area of Science:

Cardiovascular Biology
Cell Biology
Biomedical Research

Background:

Platelet activation releases microparticles, but their role in angiogenesis is unclear.
Platelet-derived microparticles (PMP) are implicated in various physiological and pathological processes.

Purpose of the Study:

To investigate the effect of PMP on angiogenesis.
To elucidate the underlying mechanisms of PMP-mediated angiogenesis.

Main Methods:

In vitro studies: rat aortic ring assay, endothelial cell invasion assays.
In vivo studies: agarose bead transplantation in mice, artificial cardiac ischemia model in rats.

Main Results:

PMP demonstrated a dose-dependent pro-angiogenic effect in vitro, mediated by VEGF, PI 3-kinase, Src kinase, and ERK.
PMP enhanced endothelial cell invasion, involving VEGF, heparanase, and PDGF.
PMP promoted angiogenesis in vivo and improved capillary function in a rat model of chronic myocardial ischemia.

Conclusions:

PMP significantly induce angiogenesis both in vitro and in vivo.
PMP administration may enhance revascularization in ischemic myocardium, suggesting therapeutic potential.