Wobbler mice modeling motor neuron disease display elevated transactive response DNA binding protein.
Wobbler mice model motor neuron disease with a substantial decline in motor neurons. TDP-43 is a nucleic acid binding protein that accumulates, along with ubiquitin, in the cytoplasm of amyotrophic lateral sclerosis (ALS) motor neurons. Recently, it was reported that Cu/Zn superoxide dismutase type 1 (SOD1) familial amyotrophic lateral sclerosis (fALS) model mice do not mimic the TDP-43 changes seen in sporadic ALS, although they share a large number of other properties with the human disorder. We examined ubiquitin inclusions and TDP-43 expression in wobbler mice. TDP-43 mRNA, measured by quantitative reverse transcription-coupled PCR, was elevated in the wobbler spinal cord. Immunohistochemistry revealed intracellular ubiquitin inclusions and abnormal distribution of TDP-43 into the cytoplasm in wobblers similar to the staining reported in ALS. Finally, nuclear and cytoplasmic fractions, examined by Western immunoblotting, confirmed a delocalization of TDP-43 in the neurodegenerative wobbler. These observations indicate that wobbler mice, which suffer motor neuron loss at 21 days, undergo TDP-43 and ubiquitin changes characteristic of sporadic ALS.
Dennis
J S
JS
Laboratory of Molecular Biology, Building 22, Room 123, Research and Development 151, Bay Pines VA Healthcare System, 10000 Bay Pines Boulevard, Bay Pines, FL 33744, USA.
Citron
B A
BA
D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004195:Disease Models, Animal; D005786:Gene Expression Regulation / Q000235:genetics; D051379:Mice; D008818:Mice, Neurologic Mutants; D016472:Motor Neuron Disease / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000378:metabolism*; D013116:Spinal Cord / Q000473:pathology; D025801:Ubiquitin / Q000378:metabolism
D004268:DNA-Binding Proteins; D012333:RNA, Messenger; D025801:Ubiquitin