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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...
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The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
Mechanism of Angiogenesis01:10

Mechanism of Angiogenesis

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Diabetic Retinopathy

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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Related Experiment Video

Updated: Jul 10, 2026

Trophoblast Cell Recovery from Angiogenesis-Tube Formation Assay for Differentiation Marker Expression Analysis
05:30

Trophoblast Cell Recovery from Angiogenesis-Tube Formation Assay for Differentiation Marker Expression Analysis

Published on: November 8, 2024

Preeclampsia and angiogenic imbalance.

Sharon Maynard1, Franklin H Epstein, S Ananth Karumanchi

  • 1Renal Division, Department of Medicine, George Washington University School of Medicine, USA.

Annual Review of Medicine
|October 17, 2007
PubMed
Summary

Preeclampsia involves placental antiangiogenic factors like soluble Flt1 and soluble endoglin, which cause endothelial dysfunction and pregnancy hypertension. Understanding these factors may improve preeclampsia detection and treatment.

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Trophoblast Cell Recovery from Angiogenesis-Tube Formation Assay for Differentiation Marker Expression Analysis
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Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas
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Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas

Published on: January 26, 2024

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Vascular Biology

Background:

  • Preeclampsia is a pregnancy syndrome causing endothelial dysfunction, originating in the placenta.
  • The molecular causes of preeclampsia were unclear until recent focus on placental antiangiogenic factors.

Purpose of the Study:

  • To explore the role of antiangiogenic factors in preeclampsia pathogenesis.
  • To investigate the molecular basis of placental dysregulation in preeclampsia.

Main Methods:

  • Analysis of maternal circulation for antiangiogenic factors.
  • Exploration of angiogenic proteins in early placental vascular development.

Main Results:

  • Increased placental antiangiogenic factors (soluble Flt1, soluble endoglin) detected in maternal circulation before preeclampsia onset.
  • These factors induce systemic endothelial dysfunction, leading to hypertension and proteinuria.

Conclusions:

  • Altered placental expression of antiangiogenic factors is key to preeclampsia development.
  • Discoveries offer potential for transforming preeclampsia detection and treatment.