Related Experiment Video
Updated: Jul 19, 2026
06:02
Anatomical Reconstructions of the Human Cardiac Venous System using Contrast-computed Tomography of Perfusion-fixed Specimens
Published on: April 18, 2013
MAPping out arteries and veins.
1Department of Biochemistry and Molecular Biology, University of Calgary, Calgary AB, Canada T2N 4N1, Canada. relamont@ucalgary.ca
Science'S STKE : Signal Transduction Knowledge Environment
|October 5, 2006
Summary
Two competing signaling pathways downstream of VEGF receptor 2 determine arterial or venous cell fate. The MAPK pathway promotes arterial identity, while PI3K-Akt inhibits it, favoring venous development.
Area of Science:
- Vascular biology
- Developmental biology
- Molecular signaling
Background:
- Artery and vein identity is genetically determined before circulation begins.
- Sonic hedgehog (Shh), VEGF, VEGFR2, Foxc1/2, Notch, and Gridlock are crucial for arterial marker expression.
- COUP-TFII is the sole previously identified factor for venous fate maintenance.
Purpose of the Study:
- To review recent findings on competing signaling pathways in arterial-venous specification.
- To discuss the role of MAPK signaling in promoting arterial fate.
Main Methods:
- Review of existing literature on signaling cascades in vascular development.
- Analysis of downstream pathways of VEGFR2 in cell fate determination.
Main Results:
- Two competing pathways downstream of VEGFR2 regulate arterial versus venous specification.
- The PLC-gamma-MAPK pathway is implicated in arterial specification.
- The PI3K-Akt pathway inhibits the PLC-gamma-MAPK pathway, promoting venous fate.
Conclusions:
- VEGFR2 signaling bifurcates into distinct pathways controlling arterial and venous fates.
- MAPK pathway activation is a key driver of arterial specification.
- Understanding these pathways provides insight into vascular development and potential therapeutic targets.
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