Table of Contents
International Journal of Molecular Imaging
Volume 2014 (2014), Article ID 471032, 5 pages
http://dx.doi.org/10.1155/2014/471032
Research Article

Comparison of 99mTc-Tetrofosmin and 99mTc-Sestamibi Uptake in Glioma Cell Lines: The Role of P-Glycoprotein Expression

1Neurosurgical Institute, University of Ioannina, Stavros Niarchos Avenue, 45500 Ioannina, Greece
2Department of Nuclear Medicine, University Hospital of Ioannina, Stavros Niarchos Avenue, 45500 Ioannina, Greece
3Department of Medical Physics, University of Ioannina, Stavros Niarchos Avenue, 45500 Ioannina, Greece

Received 19 July 2014; Accepted 17 October 2014; Published 10 November 2014

Academic Editor: Seigo Kinuya

Copyright © 2014 George A. Alexiou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tc-Tetrofosmin (Tc-TF) and Tc-Sestamibi (Tc-MIBI) are SPECT tracers that have been used for brain tumor imaging. Tumor’s multidrug resistance phenotype, namely, P-glycoprotein (p-gp), and the multidrug resistance related proteins (MRPs) expression have been suggested to influence both tracers’ uptake. In the present study we set out to compare Tc-MIBI uptake in high-grade glioma cell lines and to investigate the influence of gliomas p-gp expression on both tracers’ uptake. We used four glioma cell lines (U251MG, A172, U87MG, and T98G). The expression of p-gp protein was evaluated by flow cytometry. Twenty μCi (7.4·105 Bq) of Tc-TF and Tc-MIBI were used. The radioactivity in the cellular lysate was measured with a dose calibrator. P-gp was significantly expressed only in the U251MG cell line (). In all gliomas cell lines (U251MG, U87MG, A172, and T98G) the Tc-TF uptake was significantly higher than Tc-sestamibi. The U251MG cell line, in which significant p-gp expression was documented, exhibited the strongest uptake difference. Tc-TF uptake was higher than Tc-MIBI in all studied high-grade glioma cell lines. Thus, Tc-TF may be superior to Tc-MIBI for glioma imaging in vivo.