Subcellular in vivo H-1 MR spectroscopy of Xenopus laevis oocytes

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In vivo magnetic resonance (MR) spectra are typically obtained from voxels whose spatial dimensions far exceed those of the cells they contain. This study was designed to evaluate the potential of localized MR spectroscopy to investigate subcellular phenomena. Using a high magnetic field and a home-built microscopy probe with large gradient field strengths, we achieved voxel sizes of (180 mu m)(3). In the large oocytes of the frog Xenopus laevis, this was small enough to allow the recording of the first compartment-selective in vivo MR spectra from the animal and vegetal cytoplasm as well as the nucleus. The two cytoplasmic regions differed in their lipid contents and NMR lineshape characteristics-differences that are not detectable with whole-cell NMR techniques. In the nucleus, the signal appeared to be dominated by water, whereas other contributions were negligible. We also used localized spectroscopy to monitor the uptake of diminazene acturate, an antitrypanosomal agent, into compartments of a single living oocyte. The resulting spectra from the nucleus and cytoplasm revealed different uptake kinetics for the two components of the drug and demonstrate that MR technology is on the verge of becoming a tool for cell biology.
Publisher
BIOPHYSICAL SOC
Issue Date
2006-03
Language
English
Article Type
Article
Keywords

MAGNETIC-RESONANCE-SPECTROSCOPY; NMR MICROSCOPY; SINGLE NEURONS; H-1-NMR SPECTROSCOPY; HUMAN BRAIN; DIFFUSION; CELLS; WATER; GRADIENT; PERMEABILITY

Citation

BIOPHYSICAL JOURNAL, v.90, no.5, pp.1797 - 1803

ISSN
0006-3495
DOI
10.1529/biophysj.105.073502
URI
http://hdl.handle.net/10203/91080
Appears in Collection
CH-Journal Papers(저널논문)
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