Subcellular in vivo1H MR spectroscopy of Xenopus laevis oocytes

Seung Cheol Lee, Jee Hyun Cho, Daniel Mietchen, Young Sook Kim, Soo Hong Kwan, Chulhyun Lee, Dongmin Kang, Deok Park Ki, Byong Seok Choi, Chaejoon Cheong

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


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 μm)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.

Original languageEnglish
Pages (from-to)1797-1803
Number of pages7
JournalBiophysical Journal
Issue number5
StatePublished - Mar 2006


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