Novel autoantibodies against 7SL RNA in patients with polymyositis/dermatomyositis.

Abstract

OBJECTIVE:

Autoantibodies against signal recognition particle (SRP) are detected in patients with polymyositis/dermatomyositis (PM/DM). The SRP consists of 7SL RNA and 6 protein components. We examined autoantibodies against deproteinized 7SL RNA in PM/DM patients with anti-SRP antibodies and evaluated the association of anti-7SL RNA antibodies with PM/DM clinically and serologically.

METHODS:

Sera from 10 Japanese and 22 North American PM/DM patients with anti-SRP antibodies were tested for the presence of anti-7SL RNA antibodies, using the sera to immunoprecipitate deproteinized RNA extracts derived from HeLa cells.

RESULTS:

The immunoprecipitation analysis indicated that 5 Japanese (50%) and one North American (5%) patient with anti-SRP antibodies had novel autoantibodies against deproteinized 7SL RNA. The frequency of anti-7SL RNA antibodies was significantly higher in Japanese than North American patients (p = 0.006). The presence of anti-7SL RNA antibodies appeared to be associated with DM (2 patients) and finger swelling (2 PM patients). The seasonal onset of the disease was different (p = 0.008) for Japanese PM/DM patients with anti-7SL RNA antibodies, who developed the disease between October and January (mean month November; p = 0.01) from that of patients without these antibodies, who developed it between June and August (mean month July; p = 0.01).

CONCLUSION:

Novel autoantibodies against 7SL RNA were identified in patients with PM/DM, and the presence of these antibodies was correlated to ethnic background, clinical features, and season of disease onset. These findings indicated that autoantibodies against 7SL RNA are a novel serological marker for a subset of PM/DM cases.

• Authors: Takashi Satoh, Tetsuroh Okano, Toshimichi Matsui, Hiroyuki Watabe, Takashi Ogasawara, Kouya Kubo, Masataka Kuwana, Noreen Fertig, Chester V Oddis, Hirobumi Kondo, Tohru Akahoshi
• Journal: The Journal of rheumatology (J Rheumatol) Vol. 32 Issue 9 Pg. 1727-33 (Sep 2005) ISSN: 0315-162X [Print] Canada
• PMID: 16142868 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• 7SL RNA
• Autoantibodies
• Biomarkers
• RNA, Small Cytoplasmic
• Signal Recognition Particle

Topics

• Adult
• Asian People
• Autoantibodies (analysis, immunology)
• Biomarkers
• Cohort Studies
• Dermatomyositis (blood, ethnology, immunology)
• Female
• Follow-Up Studies
• Humans
• Immunoprecipitation
• Male
• Middle Aged
• Polymyositis (blood, ethnology, immunology)
• Probability
• RNA, Small Cytoplasmic (analysis, immunology)
• Risk Assessment
• Sensitivity and Specificity
• Severity of Illness Index
• Signal Recognition Particle (analysis, immunology)
• White People