Muscle atrophy and motor neuron degeneration in human NEDL1 transgenic mice.
Amyotrophic lateral sclerosis (ALS) is the most frequent adult-onset motor neuron disease. Approximately 20% cases of familial ALS show the mutation in the superoxide dismutase-1 (SOD1) gene. We previously demonstrated that homologue to E6AP carboxyl terminus- (HECT-) type ubiquitin protein E3 ligase (NEDL1) physically bind to mutated SOD1 protein but not wild-type SOD1 and promote the degradation of mutated SOD1 protein through ubiquitin-mediated proteasome pathway. To further understand the role of NEDL1 involved in the pathogenesis of familial ALS, we generated transgenic mice with human NEDL1 cDNA. The transgenic mice with human NEDL1 expression showed motor dysfunctions in rotarod, hanging wire, and footprint pattern examination. Histological studies indicated degeneration of neurons in the lumbar spinal cord and muscle atrophy. The number of activated microglia in the spinal cord of transgenic mice was significantly higher than that of wild-type mice, suggesting that inflammation might be observed in the spinal cord of transgenic mice. In conclusion, these findings suggest that the human NEDL1 transgenic mice might develop ALS-like symptoms, showing signs of motor abnormalities, accompanied with significant reduction in muscle strength.
Zhang
Lin
L
Division of Biochemistry and Innovative Cancer Therapeutics, Chiba Cancer Center Research Institute, 666-2 Nitona, Chuoh-Ku, Chiba 260-8717, Japan.
Haraguchi
Seiki
S
Koda
Tadayuki
T
Hashimoto
Kenji
K
Nakagawara
Akira
A
D000690:Amyotrophic Lateral Sclerosis / Q000235:genetics* / Q000473:pathology*; D000818:Animals; D004195:Disease Models, Animal; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D017628:Microglia / Q000378:metabolism; D009046:Motor Neurons / Q000378:metabolism / Q000473:pathology*; D009133:Muscular Atrophy / Q000473:pathology; D009410:Nerve Degeneration; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism*; D013116:Spinal Cord / Q000473:pathology; D013482:Superoxide Dismutase / Q000235:genetics / Q000378:metabolism*; D000072105:Superoxide Dismutase-1; D044767:Ubiquitin-Protein Ligases / Q000235:genetics* / Q000378:metabolism*
D009419:Nerve Tissue Proteins; C000606290:SOD1 protein, human; C000606291:Sod1 protein, mouse; D013482:Superoxide Dismutase; D000072105:Superoxide Dismutase-1; C485367:HECW1 protein, human; D044767:Ubiquitin-Protein Ligases