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Related Experiment Video

Updated: Jun 5, 2026

Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos

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Shroom2 regulates contractility to control endothelial morphogenesis.

Matthew J Farber¹, Ryan Rizaldy, Jeffrey D Hildebrand

¹Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA.

Molecular Biology of the Cell

|January 21, 2011

Summary

Shroom2 (Shrm2) protein regulates endothelial cell contractility, crucial for forming blood vessels. Its depletion increases sprouting and migration, disrupting vascular network formation.

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Area of Science:

Cell Biology
Developmental Biology
Vascular Biology

Background:

Endothelial cells' contractile, migratory, and adhesive properties are key to vascular network formation.
Shroom2 (Shrm2) is expressed in endothelial cells and localized to actin and cell-cell adhesions.
Shrm2 contains a Rho kinase (Rock) binding domain, suggesting a role in regulating endothelial cell behavior.

Purpose of the Study:

To investigate the role of Shroom2 in regulating endothelial cell behavior during vascular morphogenesis.
To determine if Shrm2 influences endothelial cell contractility, migration, and angiogenesis.

Main Methods:

Depletion of Shrm2 in endothelial cells and embryonic stem cells.
Analysis of angiogenic behavior, branching, and sprouting.
Assessment of cell contractility, stress fiber organization, and collagen contraction.
Investigation of Shrm2's interaction with Rho kinase (Rock) and myosin II localization.

Main Results:

Shrm2 depletion led to increased endothelial cell branching and sprouting (angiogenesis).
This effect was observed in human umbilical vein endothelial cells and during embryonic stem cell-derived vasculogenesis.
Shrm2 depletion resulted in decreased cell contractility, reduced stress fibers, and impaired collagen contraction.
Loss of Shrm2 caused Rock and activated myosin II to detach from cell-cell adhesion sites, increasing cell migration.

Conclusions:

Shroom2 facilitates the formation of a contractile endothelial network.
Loss of Shrm2 disrupts this network, leading to increased endothelial sprouting, migration, and angiogenesis.
Shrm2 plays a critical role in regulating vascular morphogenesis through its interaction with Rock and myosin II.