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Cord Blood Stem Cells Inhibit Epidermal Growth Factor Receptor Translocation to Mitochondria in Glioblastoma

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Title: Cord Blood Stem Cells Inhibit Epidermal Growth Factor Receptor Translocation to Mitochondria in Glioblastoma
Author(s): Dasari, Venkata Ramesh; Velpula, Kiran Kumar; Alapati, Kiranmai; Gujrati, Meena; Tsung, Andrew J.
Abstract: Background: Overexpression of EGFR is one of the most frequently diagnosed genetic aberrations of glioblastoma multiforme (GBM). EGFR signaling is involved in diverse cellular functions and is dependent on the type of preferred receptor complexes. EGFR translocation to mitochondria has been reported recently in different cancer types. However, mechanistic aspects of EGFR translocation to mitochondria in GBM have not been evaluated to date. Methodology/Principle Findings: In the present study, we analyzed the expression of EGFR in GBM-patient derived specimens using immunohistochemistry, reverse-transcription based PCR and Western blotting techniques. In clinical samples, EGFR co-localizes with FAK in mitochondria. We evaluated this previous observation in standard glioma cell lines and in vivo mice xenografts. We further analyzed the effect of human umbilical cord blood stem cells (hUCBSC) on the inhibition of EGFR expression and EGFR signaling in glioma cells and xenografts. Treatment with hUCBSC inhibited the expression of EGFR and its co-localization with FAK in glioma cells. Also, hUCBSC inhibited the co-localization of activated forms of EGFR, FAK and c-Src in mitochondria of glioma cells and xenografts. In addition, hUCBSC also inhibited EGFR signaling proteins in glioma cells both in vitro and in vivo. Conclusions/Significance: We have shown that hUCBSC treatments inhibit phosphorylation of EGFR, FAK and c-Src forms. Our findings associate EGFR expression and its localization to mitochondria with specific biological functions in GBM cells and provide relevant preclinical information that can be used for the development of effective hUCBSC-based therapies.
Issue Date: 2012-02
Publisher: Public Library of Science
Citation Info: Dasari, V. R., Velpula, K. K., Alapati, K., Gujrati, M., & Tsung, A. J. 2012. Cord blood stem cells inhibit epidermal growth factor receptor translocation to mitochondria in glioblastoma. PLoS One, 7(2): e31884. doi:10.1371/journal.pone.0031884
Type: Article
Description: © 2012 Dasari et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. doi:10.1371/journal.pone.0031884
ISSN: 1932-6203
Sponsor: This research is supported by a grant from Illinois Neurological Institute (to AJT). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Date Available in INDIGO: 2012-08-21

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