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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...
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...
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TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
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Interactions Between Signaling Pathways

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Modified In Vivo Matrix Gel Plug Assay for Angiogenesis Studies
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AKT signaling in regulating angiogenesis.

Bing-Hua Jiang1, Ling-Zhi Liu

  • 1Lab. of Reproductive Medicine, Cancer Center, Nanjing Medical University, Nanjing 210029, Jiangsu, China. bhjiang@njmu.edu.cn

Current Cancer Drug Targets
|February 22, 2008
PubMed
Summary

The AKT signaling pathway is crucial for tumor angiogenesis. Inhibiting AKT and its targets offers a promising strategy for developing new cancer therapeutics by blocking tumor growth and metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • The AKT signaling pathway is a key regulator of cell survival, proliferation, and tumor growth.
  • Dysregulation of AKT pathway components like PI3K, PTEN, and Ras is common in human cancers.
  • AKT plays a significant role in both normal vascularization and pathological angiogenesis, essential for tumor progression.

Purpose of the Study:

  • To review the role and mechanisms of AKT signaling in regulating angiogenesis.
  • To explore how AKT influences the expression of key angiogenic factors like VEGF and HIF-1.
  • To discuss the therapeutic potential of targeting the AKT pathway for cancer treatment.

Main Methods:

  • Literature review of recent studies on AKT signaling and angiogenesis.

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  • Analysis of molecular mechanisms linking AKT activation to VEGF and HIF-1 expression.
  • Examination of upstream and downstream components of the AKT pathway involved in angiogenesis.

    • Main Results:

    • AKT activation is necessary and sufficient for regulating VEGF (Vascular Endothelial Growth Factor) and HIF-1 (Hypoxia-Inducible Factor 1) expression in cancer cells.
    • AKT influences VEGF and HIF-1 expression via downstream molecules HDM2 and p70S6K1.
    • AKT integrates signals from various upstream factors, including growth factors and oncogenes, to control angiogenesis.

    Conclusions:

    • Targeting AKT signaling and its downstream effectors presents a novel therapeutic strategy for inhibiting tumor angiogenesis.
    • Natural compounds that inhibit AKT activation and VEGF expression show potential for cancer prevention and treatment.
    • Understanding AKT's role in angiogenesis is vital for developing future anti-cancer therapies.