Grb7 and Filamin-a Associate and Are Colocalized to Cell Membrane Ruffles Upon EGF Stimulation

Overview

Journal J Mol Recognit

Specialty Molecular Biology

Date 2013 Oct 4

PMID 24089360

Citations 11

Authors

Prakash Paudyal

Sanjay Shrestha

Thushara Madanayake

Charles B Shuster

Larry R Rohrschneider

Aaron Rowland

Barbara A Lyons

Affiliations

Soon will be listed here.

Abstract

Grb7 is an adaptor molecule mediating signal transduction from multiple cell surface receptors to diverse downstream pathways. Grb7, along with Grb10 and Grb14, make up the Grb7 protein family. This protein family has been shown to be overexpressed in certain cancers and cancer cell lines. Grb7 and a receptor tyrosine kinase, ErbB2, are overexpressed in 20-30% of breast cancers. Grb7 overexpression has been linked to enhanced cell migration and metastasis, although the participants in these pathways have not been fully determined. In this study, we report the Grb7 protein interacts with Filamin-a, an actin-crosslinking component of the cell cytoskeleton. Additionally, we have demonstrated the interaction between Grb7 and Flna is specific to the RA-PH domains of Grb7, and the immunoglobulin-like repeat 16-19 domains of Flna. We demonstrate that full-length Grb7 and Flna interact in the mammalian cellular environment, as well as in vitro. Immunofluorescent microscopy shows potential co-localization of Grb7 and Flna in membrane ruffles upon epidermal growth factor stimulation. These studies are amongst the first to establish a clear connection between Grb7 signaling and cytoskeletal remodeling.

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