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16740261

Source:http://linkedlifedata.com/resource/pubmed/id/16740261

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pubmed-article:16740261pubmed:abstractTextMagnetic resonance imaging (MRI) has provided important information in characterizing amyotrophic lateral sclerosis (ALS) in humans and in animal models. A frequently used animal model to study mechanisms of pathogenesis and the efficacy of drugs in ALS is a transgenic mouse over-expressing the human mutated G93A-superoxide dismutase 1 (G93A-SOD1). In our study, we applied MRI to find suitable progression markers, which can be used to monitor the development of ALS and to evaluate therapeutic approaches at early stages of the disease. Therefore, we generated parameter maps of the spin-spin relaxation time (T2) and the apparent diffusion coefficient (ADC) starting at day 70 after birth, i.e., before motor scores decline around day 90. Depending on the progression of the disease, G93A-SOD1 mice showed significantly increased values of T2 in the brain stem motor nuclei Nc. V (trigeminal nucleus), VII (facial nucleus), and XII (hypoglossal nucleus), and spinal cord compared to non-transgenic wild-type mice and transgenic mice over-expressing the non-mutated wild-type human SOD1 (tg-SOD1). Similar effects in these motor nuclei were revealed by ADC mapping. Furthermore, in the upper spinal cord, a dorsal-ventral difference with significantly higher T2 values in the ventral part was demonstrated by T2 mapping. While both T2 and ADC might prove useful as progression markers and enable the longitudinal non-invasive evaluation of ALS in G93A-SOD1 mice, the potential is limited by age-dependent effects in case of ADC mapping.lld:pubmed
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pubmed-article:16740261pubmed:articleTitleIn vivo quantification of spinal and bulbar motor neuron degeneration in the G93A-SOD1 transgenic mouse model of ALS by T2 relaxation time and apparent diffusion coefficient.lld:pubmed
pubmed-article:16740261pubmed:affiliationDepartment of Neurology II, Otto-Von-Guericke University Magdeburg, Leipziger Str 44, Magdeburg, Germany. heiko.niessen@medizin.uni-magdeburg.delld:pubmed
pubmed-article:16740261pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16740261pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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