Anti-Cortactin Autoantibodies Are Associated With Key Clinical Features in Adult Myositis but Are Rarely Present in Juvenile Myositis

on behalf of the Childhood Myositis Heterogeneity Collaborative Study Group

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Abstract

Objective: To define the prevalence and clinical phenotype of anti-cortactin autoantibodies in adult and juvenile myositis. Methods: In this longitudinal cohort study, anti-cortactin autoantibody titers were assessed by enzyme-linked immunosorbent assay in 670 adult myositis patients and 343 juvenile myositis patients as well as in 202 adult healthy controls and 90 juvenile healthy controls. The prevalence of anti-cortactin autoantibodies was compared among groups. Clinical features of patients with and those without anti-cortactin autoantibodies were also compared. Results: Anti-cortactin autoantibodies were more common in adult dermatomyositis (DM) patients (15%; P = 0.005), particularly those with coexisting anti–Mi-2 autoantibodies (24%; P = 0.03) or anti–NXP-2 autoantibodies (23%; P = 0.04). In adult myositis, anti-cortactin was associated with DM skin involvement (62% of patients with anti-cortactin versus 38% of patients without anti-cortactin; P = 0.03), dysphagia (36% versus 17%; P = 0.02) and coexisting anti–Ro 52 autoantibodies (47% versus 26%; P = 0.001) or anti-NT5c1a autoantibodies (59% versus 33%; P = 0.001). Moreover, the titers of anti-cortactin antibodies were higher in patients with interstitial lung disease (0.15 versus 0.12 arbitrary units; P = 0.03). The prevalence of anti-cortactin autoantibodies was not different in juvenile myositis patients (2%) or in any juvenile myositis subgroup compared to juvenile healthy controls (4%). Nonetheless, juvenile myositis patients with these autoantibodies had a higher prevalence of “mechanic's hands” (25% versus 7%; P = 0.03), a higher number of hospitalizations (2.9 versus 1.3; P = 0.04), and lower peak creatine kinase values (368 versus 818 IU/liter; P = 0.02) than those without anti-cortactin. Conclusion: The prevalence of anti-cortactin autoantibodies is increased in adult DM patients with coexisting anti–Mi-2 or anti–NXP-2 autoantibodies. In adults, anti-cortactin autoantibodies are associated with dysphagia and interstitial lung disease.

Original languageEnglish (US)
JournalArthritis and Rheumatology
DOIs
StatePublished - Feb 2022

Bibliographical note

Funding Information:
We would like to thank the Childhood Myositis Heterogeneity Collaborative Study Group (see Appendix A).

Publisher Copyright:
© 2021 American College of Rheumatology. This article has been contributed to by US Government employees and their work is in the public domain in the USA.

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

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