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Platelet-derived growth factor receptor independent proliferation of human glioblastoma cells: selective tyrosine kinase inhibitors lack antiproliferative activity

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Abstract

Purpose: The aim of this study was to investigate the role of platelet-derived growth factor (PDGF) and PDGF receptors (PDGFRs) in the proliferation of human glioblastoma cells as a prerequisite for a new therapeutic approach to the treatment of malignant brain tumors with selective tyrosine kinase inhibitors such as imatinib. Methods and results: In the human glioblastoma cell lines U-87 MG, U-118 MG and U-373 MG different PDGF and PDGFR mRNAs were detected by RT-PCR, and the expression of the receptor proteins was demonstrated by immunostaining and flow cytometry. Moreover, functional activity of PDGFRs was demonstrated in PDGFRβ expressing glioblastoma cell variants by measuring the mobilization of intracellular Ca2+ upon PDGF-BB stimulation. However, addition of PDGF-BB to the serum-free culture medium had no stimulatory effect on cell proliferation. Furthermore, cell growth in serum-supplemented and serum-free medium was not affected by imatinib, leflunomide and AG-1296 at therapeutically relevant concentrations. Conclusion: Our results suggest that clinical antitumor effects of imatinib on glioblastoma, if any, are not mediated by the PDGFR.

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Abbreviations

CML:

Chronic myelogenous leukemia

FCS:

Fetal calf serum

DMSO:

Dimethyl sulfoxide

FITC:

Fluorescein isothiocyanate

MTT:

3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide

PDGF:

Platelet-derived growth factor

PDGFR:

Platelet-derived growth factor receptor

rhPDGF-BB:

Recombinant human PDGF-BB

RT-PCR:

Reverse transcription polymerase chain reaction

VEGF:

Vascular endothelial growth factor

bFGF:

Basic fibroblast growth factor

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Correspondence to Armin Buschauer.

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Gross, D., Bernhardt, G. & Buschauer, A. Platelet-derived growth factor receptor independent proliferation of human glioblastoma cells: selective tyrosine kinase inhibitors lack antiproliferative activity. J Cancer Res Clin Oncol 132, 589–599 (2006). https://doi.org/10.1007/s00432-006-0109-5

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