Abstract:
:The degenerating muscle (dmu) mouse harbors a loss-of-function mutation in the Scn8a gene, which encodes the alpha subunit of the voltage-gated sodium channel (VGSC) Na(V)1.6. The distribution of c-Fos and c-Jun was examined in spinal and cranial motoneurons of the dmu mouse. In the cervical spinal cord, trigeminal motor nucleus (Vm), facial nucleus (VII), dorsal motor nucleus of the vagus (X), and hypoglossal nucleus (XII) of wild-type mice, motoneurons expressed c-Fos and c-Jun-immunoreactivity. The immunoreactivity in wild-type mice was mostly weak and localized to the nucleus of these neurons whereas in the spinal cord and brain stem of dmu mice motoneurons showed intense c-Fos and c-Jun-immunoreactivity. The number of c-Fos-immunoreactive motoneurons was dramatically elevated in the cervical spinal cord (wild type, 4.8 +/- 1.0; dmu, 17.3 +/- 1.6), Vm (wild type, 76.2 +/- 21.6; dmu, 216.9 +/- 30.9), VII (wild type, 162.4 +/- 43.3; dmu, 533.3 +/- 41.2), and XII (wild type, 58.2 +/- 43.3; dmu, 150.9 +/- 25.7). The mutation also increased the number of c-Jun-immunoreactive motoneurons in the cervical spinal cord (wild type, 1.6 +/- 0.8; dmu, 12.1 +/- 2.1), Vm (wild type, 41.4 +/- 18.0; dmu, 123.1 +/- 11.7), and X (wild type, 39.1 +/- 10.7; dmu, 92.8 +/- 17.8). The increase of these transcription factors may be associated with the uncoordinated and excessive movement of forelimbs and degeneration of cardiac muscles in dmu mice.
journal_name
Cell Mol Neurobioljournal_title
Cellular and molecular neurobiologyauthors
Ichikawa H,Kano M,Shimizu Y,Suzuki T,Sawada E,Ono W,Chu LW,Côté PDdoi
10.1007/s10571-010-9498-8subject
Has Abstractpub_date
2010-07-01 00:00:00pages
737-42issue
5eissn
0272-4340issn
1573-6830journal_volume
30pub_type
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