Sarcoplasmic redistribution of nuclear TDP-43 in inclusion body myositis.
The nucleic acid binding protein TDP-43 was recently identified in normal myonuclei and in the sarcoplasm of inclusion body myositis (IBM) muscle. Here we found TDP-43 sarcoplasmic immunoreactivity in 23% of IBM myofibers, while other reported IBM biomarkers were less frequent, with rimmed vacuoles in 2.8%, fluorescent Congo red material in 0.57%, SMI-31 immunoreactivity in 0.83%, and focal R1282 beta-amyloid immunoreactivity in 0.00% of myofibers. The presence of as little as >1% of myofibers with nonnuclear sarcoplasmic TDP-43 was highly sensitive (91%) and specific (100%) to IBM among 50 inflammatory myopathy patient samples, although some patients with hereditary inclusion body myopathies and myofibrillar myopathy also had sarcoplasmic TDP-43. TDP-43 mutations were sought, and none were identified. TDP-43 could be one of many nucleic acid binding proteins that are abnormally present in IBM sarcoplasm. They could potentially interfere with the normal function of extranuclear RNAs that maintain myofiber protein production.
Salajegheh
Mohammad
M
Department of Neurology, Division of Neuromuscular Disease, Brigham and Women's Hospital, and Harvard Medical School, 75 Francis Street, Boston, Massachusetts 02115, USA. msalajegheh@partners.org
Pinkus
Jack L
JL
Taylor
J Paul
JP
Amato
Anthony A
AA
Nazareno
Remedios
R
Baloh
Robert H
RH
Greenberg
Steven A
SA
D016229:Amyloid beta-Peptides / Q000378:metabolism; D003224:Congo Red; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007211:Indoles; D018485:Muscle Fibers, Skeletal / Q000166:cytology*; D018979:Myositis, Inclusion Body / Q000378:metabolism* / Q000473:pathology*; D016900:Neurofilament Proteins / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D012519:Sarcoplasmic Reticulum / Q000378:metabolism*
D016229:Amyloid beta-Peptides; D004268:DNA-Binding Proteins; D007211:Indoles; D016900:Neurofilament Proteins; C051774:neurofilament protein H; D003224:Congo Red; C007293:DAPI