Send to

Choose Destination
See comment in PubMed Commons below
FEBS Lett. 2002 Nov 20;531(3):565-9.

Activated Galphaq family members induce Rho GTPase activation and Rho-dependent actin filament assembly.

Author information

Physiology Department, 136 Harrison Avenue, Tufts University School of Medicine, Boston, MA 02111, USA.


Rho GTPase is required for actin filament assembly and serum response element (SRE)-dependent gene transcription. Certain G protein-coupled receptors (GPCRs) induce Rho-dependent responses, but the intermediary signaling steps are poorly understood. The heterotrimeric Galpha12 family can induce Rho-dependent responses. In contrast, there are conflicting reports on the role of the Galphaq family in Rho signaling. We report that expression of activated Galphaq members, or activation of endogenous Galphaq via GPCR stimulation, induces SRE reporter activation via Rho, and increased GTP-Rho levels. Moreover, microinjection of activated Galphaq in fibroblasts induces actin stress fiber formation via Rho. Galphaq functionally cooperates with Lbc Rho guanine nucleotide exchange factor. Overall, these findings indicate that Galphaq family signals are sufficient to induce Rho-dependent cellular responses.

[Indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Wiley
    Loading ...
    Support Center