Inclusion body myositis and paraproteinemia: Incidence and immunopathologic correlations

Marines C. Dalakas*, Isabel Illa, Eduard Gallardo, Candido Juarez

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

50 Citations (Scopus)


Serum from 70 patients with sporadic inclusion body myositis (IBM) was subjected to agarose gel immunofixation electrophoresis. The IgG extracted from 9 patients with monoclonal proteins, 3 without, and 2 control subjects and was purified, biotinylated, and applied to muscle biopsy sections for immunocytochemistry and to purified muscle protein fractions for immunoblots. Sixteen of 70 (22.8%) patients with IBM, compared with 2% of age-matched controls, had a monoclonal gammopathy characterized as IgGλ in 9 patients, IgGκ in 4, IgMκ in 2, and IgAλ in 1. The mean age of IBM patients with gammopathy was 60.6 years (range, 35-77 years), compared with 66.1 years (range, 42-80 years) of the IBM patients without gammopathy. The IgG of the patients, more often than that of the control subjects, immunostained myonuclei and recognized various muscle proteins of 35 to 145 kd. We conclude that IBM, regardless of age, is frequently associated with monoclonal gammopathies, which often recognize various muscle components, especially myonuclei, suggesting disturbed immunoregulation.

Original languageEnglish
Pages (from-to)100-104
Number of pages5
JournalAnnals of Neurology
Issue number1
Publication statusPublished - 1997


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