Endosomal Accumulation of APP in Wobbler Motor Neurons and Its Implications for ALS
Author Information
Author(s): Ralf Palmisano, Panagiota Golfi, Peter Heimann, Christopher Shaw, Claire Troakes, Thomas Schmitt-John, Jörg W Bartsch
Primary Institution: King's College London
Hypothesis
Does impaired vesicle trafficking in wobbler motor neurons reflect similar mechanisms in human motor neuron disease?
Conclusion
The study found that endosomal APP/Rab7 staining indicates impaired vesicle trafficking in wobbler mouse motor neurons, which is also observed in some human ALS cases.
Supporting Evidence
- Enlarged vesicles were found in wobbler motor neurons but not in wild-type or SOD1(G93A) mice.
- Six out of fourteen human ALS cases showed APP-positive enlarged vesicles.
- APP and Rab7 were co-localized in enlarged vesicles in wobbler motor neurons.
Takeaway
The study shows that certain mouse models of ALS have problems with how cells transport proteins, which might also happen in some human cases.
Methodology
The study used ultrastructural analysis and immunohistochemistry to examine motor neurons in wobbler mice and human ALS tissues.
Limitations
The study did not find mutations in the VPS54 gene in the human ALS cases examined.
Participant Demographics
The study included 14 human MND cases with varying ages and genders.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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