OBJECTIVE: Most TDP-43 mouse models of ALS do not display cytoplasmic mislocalisation or protein aggregation of TDP-43 in spinal motor neurons in vivo. Thus, we investigated whether a combination of defective dynein with a TDP-43 mutation could trigger TDP-43 pathology. METHODS: Using immunohistochemical methods we examined the intracellular motor neuron pathology of the offspring of TDP-43WT and TDP-43M337V transgenic mice bred to heterozygous Loa mice, which carry an autosomal dominant mutation in dynein cytoplasmic 1 heavy chain 1 (Dync1h1). RESULTS: These mice did not exhibit TDP-43 mislocalisation in spinal motor neurons, but the expression of mutant dynein in combination with wildtype human TDP-43 resulted in p62 upregulation and TDP-43 aggregation, thus partially recapitulating the human disease. CONCLUSIONS: These findings provide new insights into the possible relationship between dynein and TDP-43 and could prove useful in future studies looking to elucidate the mechanism behind the TDP-43 pathology observed in ALS.
Amyotroph Lateral Scler Frontotemporal Degener
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ALS, Amyotrophic lateral sclerosis, TDP-43, dynein, motor neuron disease