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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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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DOI: https://doi.org/10.1007/s00432-006-0109-5