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Increased Serum Levels of Nε-(hexanoyl)lysine, A New Marker of Oxidative Stress, in Systemic Sclerosis KAZUHIRO SHIMIZU, FUMIHIDE OGAWA, YUICHIRO AKIYAMA, EIJI MUROI, AYUMI YOSHIZAKI, YOHEI IWATA, KAZUHIRO KOMURA, SANGJAE BAE, and SHINICHI SATO
ABSTRACT. Methods. Serum HEL levels from 26 patients with limited cutaneous SSc (lSSc), 34 with diffuse cutaneous SSc (dSSc), 20 with systemic lupus erythematosus (SLE), 20 with dermatomyositis (DM), and 40 healthy individuals were examined by enzyme linked immunosorbent assay. Results. Serum HEL levels were elevated in patients with SSc compared with healthy controls (n = 40) with similar levels between patients with lSSc and dSSc (p < 0.0001). SSc patients with elevated HEL levels had increased serum levels of anti-agalactosyl IgG antibody, rheumatoid factor (RF), and IgM than those with normal HEL levels (p < 0.05). HEL levels correlated positively with anti-agalactosyl IgG antibody (p = 0.013, r = 0.408) and RF titer (p = 0.0028, r = 0.426). Conclusion. Our results suggest that oxidative stress may play an important role in immunological abnormalities of SSc, especially in the production of autoantibodies including anti-agalactosyl IgG antibody and RF. (J Rheumatol First Release Sept 1 2008) Key Indexing Terms:
Nε-(HEXANOYL)LYSINE
From the Department of Dermatology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. K. Shimizu, MD, PhD; F. Ogawa, MD, PhD; Y. Akiyama, MD; E. Muroi, MD, PhD; A. Yoshizaki, MD; Y. Iwata, MD; K. Komura, MD, PhD; S. Bae, MD, PhD; S. Sato, MD, PhD, Department of Dermatology, Nagasaki University Graduate School of Biomedical Sciences. Address reprint requests to Dr. S. Sato, Department of Dermatology, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan. E-mail: s-sato@net.nagasaki-u.ac.jp Accepted for publication June 3, 2008.
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