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Non-invasive diffusion tensor imaging detects white matter degeneration in the spinal cord of a mouse model of amyotrophic lateral sclerosis.
Neuroimage. 2011 Mar 15; 55(2):455-61.N

Abstract

Amyotrophic lateral sclerosis (ALS) is characterized by selective degeneration of motor neurons. Here we examine the ability of magnetic resonance imaging (MRI) to measure axonal degeneration in the lumbar spinal cord of the SOD1 mouse model of ALS. Diffusion tensor imaging (DTI) was successful in detecting axonal spinal cord damage in vivo. Fractional anisotropy (FA) values were reduced exclusively in the ventral white matter tracts of the lumbar spinal cord of ALS-affected SOD1 mice compared to wild-type littermates, with this effect becoming more pronounced with disease progression. The reduced FA values were therefore limited to white matter tracts arising from the motor neurons, whereas sensory white matter fibers were preserved. Significant decreases in water diffusion parallel to the white matter fibers or axial diffusivity were observed in the SOD1 mice, which can be attributed to the axonal degeneration observed by electron microscopy. At the same time, radial diffusivity perpendicular to the spinal column increased in the SOD1 mice, reflecting reduced myelination. These results demonstrate the usefulness of MRI in tracking disease progression in live animals and will aid in the assessment of treatment efficacy. This method could also potentially be adapted to aid the diagnosis and assessment of ALS progression in humans.

Authors+Show Affiliations

Queensland Brain Institute, University of Queensland, Brisbane, Queensland, Australia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21185943

Citation

Underwood, Clare K., et al. "Non-invasive Diffusion Tensor Imaging Detects White Matter Degeneration in the Spinal Cord of a Mouse Model of Amyotrophic Lateral Sclerosis." NeuroImage, vol. 55, no. 2, 2011, pp. 455-61.
Underwood CK, Kurniawan ND, Butler TJ, et al. Non-invasive diffusion tensor imaging detects white matter degeneration in the spinal cord of a mouse model of amyotrophic lateral sclerosis. Neuroimage. 2011;55(2):455-61.
Underwood, C. K., Kurniawan, N. D., Butler, T. J., Cowin, G. J., & Wallace, R. H. (2011). Non-invasive diffusion tensor imaging detects white matter degeneration in the spinal cord of a mouse model of amyotrophic lateral sclerosis. NeuroImage, 55(2), 455-61. https://doi.org/10.1016/j.neuroimage.2010.12.044
Underwood CK, et al. Non-invasive Diffusion Tensor Imaging Detects White Matter Degeneration in the Spinal Cord of a Mouse Model of Amyotrophic Lateral Sclerosis. Neuroimage. 2011 Mar 15;55(2):455-61. PubMed PMID: 21185943.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Non-invasive diffusion tensor imaging detects white matter degeneration in the spinal cord of a mouse model of amyotrophic lateral sclerosis. AU - Underwood,Clare K, AU - Kurniawan,Nyoman D, AU - Butler,Tim J, AU - Cowin,Gary J, AU - Wallace,Robyn H, Y1 - 2010/12/24/ PY - 2010/06/24/received PY - 2010/11/12/revised PY - 2010/12/14/accepted PY - 2010/12/28/entrez PY - 2010/12/28/pubmed PY - 2011/6/11/medline SP - 455 EP - 61 JF - NeuroImage JO - Neuroimage VL - 55 IS - 2 N2 - Amyotrophic lateral sclerosis (ALS) is characterized by selective degeneration of motor neurons. Here we examine the ability of magnetic resonance imaging (MRI) to measure axonal degeneration in the lumbar spinal cord of the SOD1 mouse model of ALS. Diffusion tensor imaging (DTI) was successful in detecting axonal spinal cord damage in vivo. Fractional anisotropy (FA) values were reduced exclusively in the ventral white matter tracts of the lumbar spinal cord of ALS-affected SOD1 mice compared to wild-type littermates, with this effect becoming more pronounced with disease progression. The reduced FA values were therefore limited to white matter tracts arising from the motor neurons, whereas sensory white matter fibers were preserved. Significant decreases in water diffusion parallel to the white matter fibers or axial diffusivity were observed in the SOD1 mice, which can be attributed to the axonal degeneration observed by electron microscopy. At the same time, radial diffusivity perpendicular to the spinal column increased in the SOD1 mice, reflecting reduced myelination. These results demonstrate the usefulness of MRI in tracking disease progression in live animals and will aid in the assessment of treatment efficacy. This method could also potentially be adapted to aid the diagnosis and assessment of ALS progression in humans. SN - 1095-9572 UR - https://www.unboundmedicine.com/medline/citation/21185943/Non_invasive_diffusion_tensor_imaging_detects_white_matter_degeneration_in_the_spinal_cord_of_a_mouse_model_of_amyotrophic_lateral_sclerosis_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1053-8119(10)01628-9 DB - PRIME DP - Unbound Medicine ER -