Evidence of altered age-related brain cytoarchitecture in mouse models of down syndrome: A diffusional kurtosis imaging study

Xingju Nie, Eric D. Hamlett, Ann Charlotte Granholm, Edward S. Hui, Joseph A. Helpern, Jens H. Jensen, Heather A. Boger, Heather R. Collins, Maria F. Falangola (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

Mouse models of Down syndrome (DS) exhibit abnormal brain developmental and neurodegenerative changes similar to those seen in individuals with DS. Although DS mice have been well characterized cognitively and morphologically there are no prior reports utilizing diffusion MRI. In this study we investigated the ability of diffusional kurtosis imaging (DKI) to detect the progressive developmental and neurodegenerative changes in the Ts65Dn (TS) DS mouse model. TS mice displayed higher diffusional kurtosis (DK) in the frontal cortex (FC) compared to normal mice at 2. months of age. At 5. months of age, TS mice had lower radial kurtosis in the striatum (ST), which persisted in the 8-month-old mice. The TS mice exhibited lower DK metrics values in the dorsal hippocampus (HD) at all ages, and the group difference in this region was larger at 8-months. Regression analysis showed that normal mice had a significant age-related increase in DK metrics in FC, ST and HD. On the contrary, the TS mice lacked significant age-related increase in DK metrics in FC and ST. Although preliminary, these results demonstrate that DK metrics can detect TS brain developmental and neurodegenerative abnormalities.

Original languageEnglish
Pages (from-to)437-447
Number of pages11
JournalMagnetic Resonance Imaging
Volume33
Issue number4
DOIs
Publication statusPublished - 1 May 2015
Externally publishedYes

Keywords

  • Diffusion
  • DKI
  • Down syndrome
  • Kurtosis
  • Mouse
  • MRI

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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