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Mechanism of Angiogenesis01:10

Mechanism of Angiogenesis

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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...
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Regulation of Angiogenesis and Blood Supply01:24

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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...
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The Tumor Microenvironment02:17

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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Author Spotlight: Investigating Angiogenesis and Vessel Permeability Through a Modified Matrix Gel Plug Assay
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Angiogenesis in Disease.

Diego La Mendola1, Maria Letizia Trincavelli1, Claudia Martini1

  • 1Department of Pharmacy, University of Pisa, Via Bonanno Pisano 6, 56126 Pisa, Italy.

International Journal of Molecular Sciences
|September 23, 2022
PubMed
Summary

New blood vessel formation, or angiogenesis, is crucial for growth and healing. This process involves complex molecular signaling pathways that regulate capillary development from existing vasculature.

Area of Science:

  • Cardiovascular Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Angiogenesis is the physiological process of new blood vessel formation from pre-existing vessels.
  • This complex mechanism is essential for embryonic development, wound healing, and tissue repair.
  • Dysregulation of angiogenesis is implicated in various diseases, including cancer and ischemic disorders.

Discussion:

  • The intricate molecular mechanisms governing sprouting angiogenesis are critical for understanding vascular development.
  • Key signaling pathways, such as VEGF and Notch, play pivotal roles in endothelial cell behavior during vessel formation.
  • Understanding these pathways offers therapeutic targets for diseases characterized by aberrant angiogenesis.

Key Insights:

  • Angiogenesis involves a coordinated sequence of endothelial cell activation, migration, proliferation, and tube maturation.

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  • Specific growth factors and their receptors initiate and propagate the angiogenic cascade.
  • The tumor microenvironment often hijacks angiogenic processes to promote tumor growth and metastasis.

    • Outlook:

    • Further research into the fine-tuning of angiogenic signaling could lead to novel treatments for ischemic diseases.
    • Targeting aberrant angiogenesis presents a promising strategy for anti-cancer therapies.
    • Investigating the interplay between angiogenesis and other cellular processes will provide a more holistic view of vascular biology.