Abstract
BackgroundOverexpression 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 FindingsIn 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/SignificanceWe 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.
Highlights
Epidermal growth factor receptor (EGFR) expression in glioblastoma multiforme (GBM) has both diagnostic and prognostic significance [1,2,3,4]
Once we confirmed the presence of EGFR and FAK in GBM-patient derived samples, we checked for the co-localization of active forms of FAK and EGFR in mitochondria
Having confirmed the expression of EGFR in clinical samples and its association with FAK, we evaluated the significance of human umbilical cord blood stem cells (hUCBSC) treatment in glioma cells and xenografts in regards to EGFR status
Summary
Epidermal growth factor receptor (EGFR) expression in glioblastoma multiforme (GBM) has both diagnostic and prognostic significance [1,2,3,4]. Substantial experimental evidence support a causal role for aberrant EGFR signaling in cancer pathogenesis and resistance to treatment [8]. GBM show very high resistance to treatment with radiation and chemotherapy and aberrant EGFR signaling contributes to this resistance. Overexpression of EGFR is one of the most frequently diagnosed genetic aberrations of glioblastoma multiforme (GBM). EGFR translocation to mitochondria has been reported recently in different cancer types. Mechanistic aspects of EGFR translocation to mitochondria in GBM have not been evaluated to date
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