Noninvasive and repetitive measurement of cellular metabolite from human osteosarcoma cells (MG-63) using 3.0 tesla proton (1H) MR spectroscopy

Abstract

Purpose: This study suggests a noninvasive and repetitive measurement method using 1H magnetic resonance spectroscopy to monitor changes in cellular metabolites within a single sample. Methods: Longitudinal acquisition of cellular metabolites from three-dimensional cultured human osteosarcoma (MG-63) cells was conducted using 3.0 Tesla 1H MRS for 2 weeks at three time points: days 1, 7, and 14. During the MR spectroscopy (MRS) scan, cell specimen temperatures were kept constant at 37°C by a lab-developed magnetic resonance compatible thermostatic device. A DNA assay and live/dead staining of the cell specimens were carried out at each time point to verify the MRS measurements. Results: Cell viability in the proposed device did not significantly differ from that of cells in a conventional incubator (P = 0.946). Cell proliferation and choline concentration increased during the first week, but remained constant during the second week. Lactate did not change during the first week, but increased during the second week. Likewise, cell viability remained constant until day 7, then decreased. Conclusion: The proposed MRS technique results in a survivable environment for longitudinal studies of cells and provides a new way to measure metabolomic changes over time in single specimens of cells. Magn Reson Med 76:1912–1918, 2016. © 2016 International Society for Magnetic Resonance in Medicine.