[Histopathological Diagnostic Marker for ALS: Phosphorylated Transacting Response DNA-Binding Protein of 43kDa in Intramuscular Nerve Bundles].

The discovery of transacting response DNA-binding protein of 43 kDa (TDP-43) led to a deeper understanding of the pathogenesis of amyotrophic lateral sclerosis (ALS). Since this discovery, blood and cerebrospinal fluid biomarkers of ALS have been reported. However, these biomarkers do not exhibit sufficient specificity for ALS. Our case-control postmortem and retrospective muscle biopsy cohort studies revealed phosphorylated TDP-43 in intramuscular nerve bundles, which precedes the clinical fulfillment of the Gold Coast criteria. We attempted to establish a histopathological biomarker for ALS and identify molecular targets for the treatment of lower motor dysfunction in patients with ALS.