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Nanopodia - Thin, Fragile Membrane Projections with Roles in Cell Movement and Intercellular Interactions

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Role for Traf4 in polarizing adherens junctions as a prerequisite for efficient cell shape changes.

Sam J Mathew¹, Martina Rembold, Maria Leptin

¹Institute of Genetics, University of Cologne, Zülpicher Strasse 47, 50674 Cologne, Germany.

Molecular and Cellular Biology

|October 12, 2011

Summary

The study reveals Traf4

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Area of Science:

Developmental Biology
Cell Biology
Genetics

Background:

Apical constriction is a key cellular mechanism driving tissue morphogenesis.
In Drosophila, mesoderm invagination relies on apical constriction, regulated by Twist and involving adherens junctions and acto-myosin networks.

Purpose of the Study:

To investigate the role of Traf4, a tumor necrosis factor receptor-associated factor (TRAF) family member, in the apical constriction of Drosophila mesodermal cells.
To elucidate the mechanism by which Traf4 influences adherens junction remodeling during ventral furrow formation.

Main Methods:

Genetic analysis in Drosophila embryos.
Observation of mesodermal cell behavior during ventral furrow formation.
Co-immunoprecipitation and functional interaction assays between Traf4 and Armadillo.

Main Results:

Traf4 is essential for efficient apical constriction and mesoderm internalization.
Traf4 is required for correct apical localization of Armadillo in constricting cells.
Traf4 physically and functionally interacts with Armadillo, independent of TNF receptor and JNK signaling.

Conclusions:

Traf4 plays a critical role in regulating adherens junction dynamics during epithelial morphogenesis.
Traf4 fine-tunes adherens junction assembly through interaction with Armadillo, distinct from its known roles in immunity.