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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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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...
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Oral anticoagulants are vital tools in preventing and treating blood clotting disorders. This diverse class of medications can be categorized as vitamin K antagonists, exemplified by warfarin, and direct thrombin inhibitors (DTIs), such as dabigatran, as well as factor Xa inhibitors, including rivaroxaban.
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Related Experiment Video

Updated: Jul 7, 2026

Rat Mesentery Angiogenesis Assay
18:30

Rat Mesentery Angiogenesis Assay

Published on: June 18, 2011

Anti-angiogenic function of tocotrienol.

Teruo Miyazawa1, Akira Shibata, Kiyotaka Nakagawa

  • 1Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan. miyazawa@biochem.tohoku.ac.jp

Asia Pacific Journal of Clinical Nutrition
|May 28, 2008
PubMed
Summary

Tocotrienols (T3), found in rice bran and palm oil, are potent anti-angiogenic compounds. They inhibit new blood vessel formation, showing potential for preventing diseases like cancer and diabetic retinopathy.

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Assessment of the Anticoagulant and Anti-inflammatory Properties of Endothelial Cells Using 3D Cell Culture and Non-anticoagulated Whole Blood
07:08

Assessment of the Anticoagulant and Anti-inflammatory Properties of Endothelial Cells Using 3D Cell Culture and Non-anticoagulated Whole Blood

Published on: September 5, 2017

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nutritional Science

Background:

  • Angiogenesis, the formation of new blood vessels, is crucial in pathological conditions like tumor growth, rheumatoid arthritis, and diabetic retinopathy.
  • Controlling angiogenesis through drugs or dietary components offers a promising strategy for preventing related disorders.
  • Identifying natural anti-angiogenic food components is an active area of research.

Purpose of the Study:

  • To investigate the anti-angiogenic properties of food components.
  • To identify specific compounds with potent anti-angiogenic activity.
  • To elucidate the molecular mechanisms underlying the anti-angiogenic effects.

Main Methods:

  • In vitro studies using human umbilical vein endothelial cells (HUVECs) to assess proliferation, migration, and tube formation.
  • In vivo studies using a mouse dorsal air sac (DOS) assay to evaluate tumor cell-induced angiogenesis.
  • Western blotting to analyze the activation of key signaling pathways (ERK, Akt, eNOS, VEGFR2).

Main Results:

  • Tocotrienols (T3), particularly delta, beta, and gamma-T3, demonstrated significant anti-angiogenic activity in both in vitro and in vivo models.
  • T3 inhibited growth factor-induced proliferation, migration, and tube formation in HUVECs.
  • T3 suppressed tumor cell-induced angiogenesis in the mouse DOS assay, while Tocopherol (Toc) showed no such effect.
  • Mechanistically, T3 inhibited the activation of extracellular signal-regulated kinase (ERK), Akt, endothelial nitric oxide synthase (eNOS), and phosphorylation of vascular endothelial growth factor receptor 2 (VEGFR2) in a dose-dependent manner.

Conclusions:

  • Tocotrienols (T3) are potent inhibitors of angiogenesis.
  • The anti-angiogenic mechanism of T3 involves the suppression of key signaling pathways regulating endothelial cell survival, migration, and blood vessel formation.
  • T3 holds potential as a dietary intervention for preventing or managing angiogenic disorders in humans.