Rheumatology Advance Access originally published online on January 31, 2006
Rheumatology 2006 45(7):815-818; doi:10.1093/rheumatology/kel012
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Serum levels of 8-isoprostane, a marker of oxidative stress, are elevated in patients with systemic sclerosis
Department of Dermatology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki and 1 Department of Dermatology, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan.
Correspondence to: S. Sato, Department of Dermatology, Nagasaki University Graduate School of Biomedical Sciences, 171 Sakamoto, Nagasaki 852-8501, Japan. E-mail: s-sato{at}net.nagasaki-u.ac.jp
Objective. To determine serum levels and clinical correlation of 8-isoprostane, which is produced in vivo through free radical-catalysed peroxidation of arachidonic acid and reflects oxidative stress, in patients with systemic sclerosis (SSc).
Methods. Serum 8-isoprostane levels from 32 patients with diffuse cutaneous SSc (dSSc) and 25 patients with limited cutaneous SSc (lSSc) were examined by enzyme-linked immunosorbent assay.
Results. Serum 8-isoprostane levels were elevated in dSSc and lSSc patients by 75-fold compared with normal controls (n=32). Serum 8-isoprostane levels correlated negatively with pulmonary function, such as percentage vital capacity and diffusion capacity for carbon monoxide, and correlated positively with renal vascular damage determined by colour flow Doppler ultrasonography. Serum 8-isoprostane levels also correlated positively with serum levels of IgG and anti-agalactosyl IgG autoantibody.
Conclusion. Increased 8-isoprostane levels correlated with the severity of pulmonary fibrosis, the extent of renal vascular damage and immunological abnormalities in SSc, suggesting that enhanced oxidative stress is related to the development of SSc.
KEY WORDS: Systemic sclerosis, Oxidative stress, 8-isoprostane, Pulmonary fibrosis, Renal vascular damage, Immunological abnormalities
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