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Brain Structure and Function

, Volume 216, Issue 2, pp 123–135 | Cite as

Diffusion tensor MRI with tract-based spatial statistics and histology reveals undiscovered lesioned areas in kainate model of epilepsy in rat

  • Alejandra Sierra
  • Teemu Laitinen
  • Kimmo Lehtimäki
  • Lassi Rieppo
  • Asla Pitkänen
  • Olli GröhnEmail author
Original Article

Abstract

In this study, we used tract-based spatial statistics (TBSS) to analyze diffusion tensor MR imaging (DTI) data acquired from the rat brain, ex vivo, for the first time. The aim was to highlight potential changes in the whole brain anatomy in the kainic acid model of epilepsy, and further characterize the changes with histology. Increased FA was observed in dorsal endopiriform nucleus, external capsule, corpus callosum, dentate gyrus, thalamus, and optic tract. A decrease in FA was seen in the horizontal limb of the diagonal band, stria medullaris, habenula, entorhinal cortex, and superior colliculus. Some of the areas have been described in kainic acid model before. However, we also found regions that to our knowledge have not been previously reported to undergo structural changes, in this model, including stria medullaris, nucleus of diagonal band, habenula, superior colliculus, external capsule, corpus callosum, and optic tract. Four of the areas highlighted in TBSS (dentate gyrus, entorhinal cortex, thalamus and stria medullaris) were analyzed in more detail with Nissl, Timm, and myelin-stained histological sections, and with polarized light microscopy. TBSS together with targeted histology confirmed that DTI changes were associated with altered myelination, neurodegeneration, and/or calcification of the tissue. Our data demonstrate that DTI in combination with TBSS has a great potential to facilitate the discovery of previously undetected anatomical changes in animal models of brain diseases.

Keywords

Diffusion tensor imaging Animal models Epilepsy Kainic acid Tract-based spatial statistics Histology Anatomics 

Abbreviations

D||

Axial diffusivity

D

Radial diffusivity

DTI

Diffusion tensor imaging

FA

Fractional anisotropy

KA

Kainic acid

MD

Mean diffusivity

PLM

Polarized light microscopy

ROI

Region of interest

TBSS

Tract-based spatial statistics

Notes

Acknowledgments

This work was supported by Academy of Finland and Sigrid Juselius Foundation. We thank Ms. Maarit Pulkkinen for assistance in histology, Dr. Jari Nissinen for technical assistance, MSc Kari Mauranen for consultation in statistical analysis, and MSc Nick Hayward for revising the language of the manuscript.

Conflict of interest

The authors declare no competing financial interests.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Alejandra Sierra
    • 1
  • Teemu Laitinen
    • 1
  • Kimmo Lehtimäki
    • 2
  • Lassi Rieppo
    • 3
    • 4
  • Asla Pitkänen
    • 1
    • 5
  • Olli Gröhn
    • 1
    Email author
  1. 1.Department of Neurobiology, A. I. Virtanen Institute for Molecular SciencesUniversity of Eastern FinlandKuopioFinland
  2. 2.Department of Biotechnology and Molecular Medicine, A. I. Virtanen Institute for Molecular SciencesUniversity of Eastern FinlandKuopioFinland
  3. 3.Department of Physics and MathematicsUniversity of Eastern FinlandKuopioFinland
  4. 4.Department of Anatomy, Institute of BiomedicineUniversity of Eastern FinlandKuopioFinland
  5. 5.Department of NeurologyKuopio University HospitalKuopioFinland

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