Evidence
J Neuropathol Exp Neurol. 2024 Jun 25:nlae052. doi: 10.1093/jnen/nlae052. Online ahead of print.
ABSTRACT
Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder. The etiology of sporadic ALS (sALS) has not yet been clarified. An increasing body of evidence suggests the involvement of viral infections and interferons (IFNs). Human myxovirus resistance protein A (MxA) is an IFN-induced dynamin-like GTPase that acts as a potent antiviral factor. This study examined MxA expression in ALS patient spinal cords using immunohistochemistry. Thirty-two cases of sALS (pathologically proven ALS-TDP), 10 non-ALS, other neurological disease control cases were examined. In most ALS cases, MxA cytoplasmic condensates were observed in the remaining spinal anterior horn neurons. The ALS group had a significantly higher rate of MxA-highly expressing neurons than the non-ALS group. Colocalization of MxA cytoplasmic condensate and transactive response DNA-binding protein 43 kDa (TDP-43)-positive inclusions was rarely observed. Because MxA has antiviral activity induced by IFNs, our results suggest that IFNs are involved in the pathogenesis of ALS in spinal cord anterior horn neurons. Our study also suggests that monitoring viral infections and IFN activation in patients with ALS may be critically important.
PMID:38916909 | DOI:10.1093/jnen/nlae052
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