TDP-43 accumulation in inclusion body myopathy muscle suggests a common pathogenic mechanism with frontotemporal dementia

C. C. Weihl, P. Temiz, S. E. Miller, G. Watts, C. Smith, M. Forman, P. I. Hanson, V. Kimonis, A. Pestronk

Research output: Contribution to journalArticle

192 Scopus citations

Abstract

TAR DNA binding protein-43 (TDP-43) is found in ubiquitinated inclusions (UBIs) in some frontotemporal dementias (FTD-U). One form of FTD-LJ, due to mutations in the valosin containing protein (VCP) gene, occurs with an inclusion body myopathy (IBMPFD). Since IBMPFD brain has TDP-43 in UBIs, we looked for TDP-43 inclusions in IBMPFD muscle. In normal muscle, TDP-43 is present in nuclei. In IBMPFD muscle, TDP-43 is additionally present as large inclusions within UBIs in muscle cytoplasm. TDP-43 inclusions were also found in 78% of sporadic inclusion body myositis (sIBM) muscles. In IBMPFD and sIBM muscle, TDP-43 migrated with an additional band on immunoblot similar to that reported in FTD-U brains. This study adds sIBM and hereditary inclusion body myopathies to the growing list of TDP-43 positive inclusion diseases.

Original languageEnglish
Pages (from-to)1186-1189
Number of pages4
JournalJournal of Neurology, Neurosurgery and Psychiatry
Volume79
Issue number10
DOIs
StatePublished - Oct 1 2008

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