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Related Experiment Video

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Visualization and Quantification of TGFβ/BMP/SMAD Signaling under Different Fluid Shear Stress Conditions using Proximity-Ligation-Assay

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Signaling crosstalk between TGFβ and Dishevelled/Par1b.

A Mamidi¹, M Inui, A Manfrin

¹Department of Biomedical Sciences, University of Padua, Italy.

Cell Death and Differentiation

|May 12, 2012

Summary

Dishevelled (Dvl) and Par1b protein interaction regulates transforming growth factor-beta (TGFβ) signaling. This crosstalk is crucial for embryonic development and tissue maintenance by preventing inhibitory ubiquitination of Smad4.

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Visualization and Quantification of TGFβ/BMP/SMAD Signaling under Different Fluid Shear Stress Conditions using Proximity-Ligation-Assay

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Area of Science:

Cellular signaling pathways
Developmental biology
Molecular mechanisms

Background:

Signaling pathway crosstalk is vital for metazoan development and homeostasis.
Transforming growth factor-beta (TGFβ) signaling is tightly regulated in vivo.
TGFβ serves as a model for inter-pathway modulation.

Purpose of the Study:

To identify novel regulatory steps in TGFβ signaling.
To investigate the role of Dishevelled (Dvl) and Par1b in TGFβ responsiveness.
To elucidate the mechanism of crosstalk between TGFβ, Wnt, and polarity pathways.

Main Methods:

Investigated protein interactions in Xenopus mesoderm development and mammalian cells.
Utilized molecular biology techniques to analyze signaling complex assembly.
Examined the effect of Wnt5a on complex formation and Smad4 ubiquitination.

Main Results:

Dishevelled (Dvl) and Par1b cooperate to facilitate TGFβ/BMP signaling in Xenopus and TGFβ responsiveness in mammals.
Wnt5a promotes the assembly of the Par1b/Dvl3/Smad4 complex.
Smad4 association with Dvl/Par1 prevents its inhibitory ubiquitination by ectodermin.

Conclusions:

A novel regulatory mechanism involving Dvl and Par1b in TGFβ signaling is identified.
This crosstalk coordinates TGFβ responses with Wnt-noncanonical and polarity pathways.
The findings provide insights into the complex regulation of developmental signaling.