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Modeling Paracrine Noncanonical Wnt Signaling In Vitro

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Published on: December 10, 2021

Rictor regulates cell migration by suppressing RhoGDI2.

N K Agarwal¹, C-H Chen, H Cho

¹Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.

|July 11, 2012

Summary

Rictor protein suppresses RhoGDI2, enhancing Rho protein activity and promoting cell migration. This finding clarifies rictor

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Rictor is a key component of mTORC2, a signaling complex regulating AGC kinases involved in cell proliferation and survival.
Rictor's ortholog in Dictyostelium regulates cell migration, but the underlying mechanisms are not well understood.

Purpose of the Study:

To elucidate the mechanism by which rictor regulates cell migration.
To investigate the role of rictor in controlling Rho protein activity.

Main Methods:

Proteomics analysis to identify rictor-dependent changes in protein expression.
Investigation of Rho-GDP dissociation inhibitor 2 (RhoGDI2) levels and activity of Rho proteins (Rac and Cdc42).
Functional assays to assess cell migration.

Main Results:

Rictor deficiency leads to increased RhoGDI2, which inhibits Rho protein activity (Rac and Cdc42) and impairs cell migration.
Rictor directly suppresses RhoGDI2, independent of Sin1 (mTORC2) or raptor (mTORC1) function.
Suppression of RhoGDI2 by rictor is crucial for promoting Rho protein activity and facilitating cell migration.

Conclusions:

Rictor regulates cell migration by controlling RhoGDI2 levels.
Rictor's suppression of RhoGDI2 enhances Rho protein activity, thereby promoting cell migration.
This mechanism highlights a novel role for rictor in cytoskeletal dynamics and cell motility.