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Comparative proteomic analysis implicates eEF2 as a novel target of PI3K? in the MDA-MB-231 metastatic breast cancer cell line.


ABSTRACT: Cancer cell migration is fundamentally required for breast tumour invasion and metastasis. The insulin-like growth factor 1 tyrosine kinase receptor (IGF-1R) and the chemokine G-protein coupled receptor, CXCR4 have been shown to play an important role in breast cancer metastasis. Our previous study has shown that IGF-1R can transactivate CXCR4 via a physical association in the human MDA-MB-231 metastatic breast cancer cell line and that this plays a key role in IGF-I-induced migration of these cells. In the present study we used pharmacological inhibition and RNAi to identify PI3K? as an important migration signalling molecule downstream of receptor transactivation in MDA-MB-231 cells. To identify PI3K?-regulated proteins upon transactivation of CXCR4 by IGF-I, we undertook a comparative proteomics approach using 2-D- Fluorescence Difference Gel Electrophoresis (DIGE) and identified the proteins by mass spectrometry.These experiments identified eukaryotic elongation factor 2 (eEF2) as a novel downstream target of PI3K? after activation of the IGF-1R-CXCR4 heterodimer by IGF-I. Further analysis demonstrated that eEF2 is phosphorylated in MDA-MB-231 cells in response to IGF-I and that this is dependent on PI3K? activity.Our data imply a novel role for PI3K? in facilitating cell migration by regulating phosphorylation of eEF2.

SUBMITTER: Niu M 

PROVIDER: S-EPMC3564858 | biostudies-other | 2013 Jan

REPOSITORIES: biostudies-other

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Comparative proteomic analysis implicates eEF2 as a novel target of PI3Kγ in the MDA-MB-231 metastatic breast cancer cell line.

Niu Meizhi M   Klingler-Hoffmann Manuela M   Brazzatti Julie A JA   Forbes Briony B   Akekawatchai Chareeporn C   Hoffmann Peter P   McColl Shaun R SR  

Proteome science 20130115 1


<h4>Unlabelled</h4><h4>Background</h4>Cancer cell migration is fundamentally required for breast tumour invasion and metastasis. The insulin-like growth factor 1 tyrosine kinase receptor (IGF-1R) and the chemokine G-protein coupled receptor, CXCR4 have been shown to play an important role in breast cancer metastasis. Our previous study has shown that IGF-1R can transactivate CXCR4 via a physical association in the human MDA-MB-231 metastatic breast cancer cell line and that this plays a key role  ...[more]

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