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Regulation of Angiogenesis and Blood Supply

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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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Interactions Between Signaling Pathways01:19

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Paracrine signaling allows cells to communicate with their immediate neighbors via secretion of signaling molecules. Such a signal can only trigger a response in nearby target cells because the signal molecules degrade quickly or are inactivated if not taken up. Prominent examples of paracrine signaling include nitric oxide signaling in blood vessels, synaptic signaling of neurons, the blood clotting system, tissue repair/wound healing, and local allergic skin reactions. Nitric oxide as a...
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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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In multicellular organisms, many molecules transmit signals between cells to pass information. These signals vary in complexity and include small peptides, nucleotides, steroids, fatty acid derivatives, and dissolved gases such as nitric oxide. Some signaling molecules diffuse through the plasma membrane to act locally between neighboring cells or travel long distances. Others remain attached to the cell surface, transmitting information to other cells only when they make contact. In some...
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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Related Experiment Video

Updated: Jul 20, 2025

Author Spotlight: Studying Brain Endothelial Barrier in Metastatic Cancer Using Impedance-Based Biosensors
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Mechanosignalling pathways that regulate endothelial barrier function.

Anna McQueen1, Christina M Warboys1

  • 1Department of Comparative Biomedical Sciences, Royal Veterinary College, Royal College Street, London, NW1 0NN, UK.

Current Opinion in Cell Biology
|August 2, 2023
PubMed
Summary

Blood vessel endothelial cells control permeability. Flowing blood

Area of Science:

  • Cardiovascular biology
  • Endothelial cell function
  • Vascular physiology

Background:

  • Endothelial cells form a vital barrier in blood vessels.
  • Increased endothelial permeability is linked to diseases like atherosclerosis.
  • Endothelial cells sense mechanical forces, particularly shear stress from blood flow.

Purpose of the Study:

  • To review how blood flow patterns (disturbed vs. undisturbed) affect endothelial barrier permeability.
  • To identify cellular targets for therapies against cardiovascular disease.

Main Methods:

  • Literature review of recent advances in understanding endothelial permeability regulation.
  • Focus on paracellular and transcellular pathways.

Main Results:

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In Vitro Model Integrating Substrate Stiffness and Flow to Study Endothelial Cell Responses
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In Vitro Model Integrating Substrate Stiffness and Flow to Study Endothelial Cell Responses

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The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
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  • Undisturbed blood flow enhances endothelial resilience and reduces macromolecule permeability.
  • Disturbed blood flow leads to endothelial dysfunction and barrier disruption.
  • Specific mechanisms of flow-induced permeability changes are discussed.

Conclusions:

  • Understanding flow-induced endothelial permeability is crucial for cardiovascular health.
  • Targeting cellular mechanisms offers potential therapeutic strategies for cardiovascular diseases.