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Notch Signaling Pathway

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...

Regulation of Angiogenesis and Blood Supply

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...

Development of Blood Vessels

Development of Blood Vessels

The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...

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Related Experiment Video

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Light-sheet Fluorescence Microscopy to Capture 4-Dimensional Images of the Effects of Modulating Shear Stress on the Developing Zebrafish Heart

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Notch signalling limits angiogenic cell behaviour in developing zebrafish arteries.

Arndt F Siekmann¹, Nathan D Lawson

¹Program in Gene Function and Expression, University of Massachusetts Medical School, Lazare Research Building, 364 Plantation Street, Worcester, Massachusetts 01605, USA.

|January 30, 2007

Summary

Notch signaling restricts endothelial cell behavior to tip cells during zebrafish blood vessel development. Disrupting Notch signaling causes excessive sprouting and abnormal cell numbers, highlighting its crucial role in angiogenesis.

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Area of Science:

Developmental biology
Cell biology
Vascular biology

Background:

Endothelial cells in growing blood vessel sprouts exhibit diverse cell fates and behaviors.
The specific signals that dictate these cell characteristics remain largely unknown.

Purpose of the Study:

To investigate the role of Notch signaling in determining endothelial cell behavior during angiogenesis in zebrafish segmental arteries.
To identify the molecular mechanisms by which Notch signaling regulates cell fate and position within developing blood vessel sprouts.

Main Methods:

Utilized zebrafish embryos for in vivo studies.
Employed mosaic analysis to assess cell localization and behavior.
Conducted in vivo time-lapse imaging to observe endothelial cell dynamics during sprouting.
Investigated gene expression patterns of flt4 and dll4.
Performed gene knockout studies for Rbpsuh, flt4, and dll4.

Main Results:

Notch signaling is essential for restricting angiogenic behavior to tip cells in zebrafish segmental arteries.
Loss of Rbpsuh (a Notch signaling component) resulted in excessive sprouting and increased endothelial cell numbers.
Notch activation suppressed angiogenesis, excluding cells from tip-cell positions.
flt4 expression in tip cells was disrupted in the absence of Notch, and its loss partially rescued cell number defects.
Loss of the Notch ligand dll4 also led to increased endothelial cell numbers.

Conclusions:

Proper specification of endothelial cell identity, position, and behavior within sprouts is critical for normal angiogenesis.
The Notch signaling pathway plays a fundamental role in regulating these processes during blood vessel development.