RT Journal Article
SR Electronic
T1 Novel autoantibodies against 7SL RNA in patients with polymyositis/dermatomyositis.
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 1727
OP 1733
VO 32
IS 9
A1 Takashi Satoh
A1 Tetsuroh Okano
A1 Toshimichi Matsui
A1 Hiroyuki Watabe
A1 Takashi Ogasawara
A1 Kouya Kubo
A1 Masataka Kuwana
A1 Noreen Fertig
A1 Chester V Oddis
A1 Hirobumi Kondo
A1 Tohru Akahoshi
YR 2005
UL http://www.jrheum.org/content/32/9/1727.abstract
AB 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.