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The protein tyrosine phosphatase Shp-2 regulates RhoA activity.
S M Schoenwaelder1, L A Petch, D Williamson
1Australian Center for Blood Diseases, Monash University Department of Medicine, 3128,., Melbourne, Australia. Simone.Schoenwaelder@med.monash.edu.au
Current Biology : CB
|December 15, 2000
Summary
This study identifies Shp-2, a protein tyrosine phosphatase (PTPase), as a key regulator of RhoA activity. Inhibiting Shp-2 increases active RhoA, impacting cell movement and cytoskeletal organization.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Actin remodeling is controlled by Rho GTPases, with RhoA critical for cell adhesion, spreading, and migration.
- Signaling pathways activating RhoA are not fully understood, but tyrosine phosphorylation is implicated.
- A calpeptin-sensitive protein tyrosine phosphatase (PTPase) acts upstream of RhoA.
Purpose of the Study:
- To identify the calpeptin-sensitive PTPase upstream of RhoA.
- To investigate the role of Shp-2 in RhoA regulation and cell migration.
Main Methods:
- In vitro and in vivo assays to assess Shp-2 catalytic activity and signaling.
- Genetic manipulation to perturb Shp-2 activity.
- Measurement of active RhoA levels.
Main Results:
- Shp-2 was identified as the calpeptin-sensitive PTPase.
- Calpeptin inhibited Shp-2 activity in vitro and in vivo.
- Perturbation of Shp-2 activity led to increased active RhoA levels.
Conclusions:
- Shp-2 acts upstream of RhoA, regulating its activity through a calpeptin-sensitive mechanism.
- Shp-2 plays a crucial role in controlling cell movement by modulating RhoA.
- These findings contribute to understanding the coordinated control of cell migration.