Abstract
Neurological disorders similar to parkinsonian syndrome and signal hyperintensity in brain on T1-weighted magnetic resonance (MR) images have been reported in patients receiving long-term total parenteral nutrition (TPN). These symptoms have been associated with manganese (Mn) depositions in brain. Although alterations of signal intensity on T1-weighted MR images in brain and of Mn concentration in blood are theoretically considered good indices for estimating Mn deposition in brain, precise correlations between these parameters have not been demonstrated as yet.
Male Sprague-Dawley rats received TPN with 10-fold the clinical dose of the trace element preparation (TE-5) for 7 d. At 0, 2, 4, 6, and 8 wk post-TPN, the cortex, striatum, midbrain, and cerebellum were evaluated by MR images, and Mn concentration in blood and Mn content in these brain sites were measured by atomic absorption spectrometry. Immediately after TPN termination, signal hyperintensity in brain sites and elevated Mn content in blood and brain sites were observed. These values recovered at 4 wk post-TPN. A positive correlation was observed between either the signal intensity in certain brain sites or Mn content in blood and the relevant brain sites.
Our observations suggest that the Mn concentration in blood and signal intensity in the brain sites on T1-weighted MR images are reliable indices for monitoring Mn contents in brain.
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Chaki, H., Furuta, S., Matsuda, A. et al. Magnetic resonance image and blood manganese concentration as indices for manganese content in the brain of rats. Biol Trace Elem Res 74, 245–257 (2000). https://doi.org/10.1385/BTER:74:3:245
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DOI: https://doi.org/10.1385/BTER:74:3:245