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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Oncotarget
2015 ; 6
(11
): 8788-806
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Targeted therapy of glioblastoma stem-like cells and tumor non-stem cells using
cetuximab-conjugated iron-oxide nanoparticles
#MMPMID25871395
Kaluzova M
; Bouras A
; Machaidze R
; Hadjipanayis CG
Oncotarget
2015[Apr]; 6
(11
): 8788-806
PMID25871395
show ga
Malignant gliomas remain aggressive and lethal primary brain tumors in adults.
The epidermal growth factor receptor (EGFR) is frequently overexpressed in the
most common malignant glioma, glioblastoma (GBM), and represents an important
therapeutic target. GBM stem-like cells (GSCs) present in tumors are felt to be
highly tumorigenic and responsible for tumor recurrence. Multifunctional magnetic
iron-oxide nanoparticles (IONPs) can be directly imaged by magnetic resonance
imaging (MRI) and designed to therapeutically target cancer cells. The targeting
effects of IONPs conjugated to the EGFR inhibitor, cetuximab (cetuximab-IONPs),
were determined with EGFR- and EGFRvIII-expressing human GBM neurospheres and
GSCs. Transmission electron microscopy revealed cetuximab-IONP GBM cell binding
and internalization. Fluorescence microscopy and Prussian blue staining showed
increased uptake of cetuximab-IONPs by EGFR- as well as EGFRvIII-expressing GSCs
and neurospheres in comparison to cetuximab or free IONPs. Treatment with
cetuximab-IONPs resulted in a significant antitumor effect that was greater than
with cetuximab alone due to more efficient, CD133-independent cellular targeting
and uptake, EGFR signaling alterations, EGFR internalization, and apoptosis
induction in EGFR-expressing GSCs and neurospheres. A significant increase in
survival was found after cetuximab-IONP convection-enhanced delivery treatment of
3 intracranial rodent GBM models employing human EGFR-expressing GBM xenografts.