Antihistone Antibodies in Systemic Sclerosis

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Abstract
Objective. To determine the prevalence and clinical significance of antihistone antibodies (AHA) in systemic sclerosis (SSc).Methods. Serum samples from patients with limited cutaneous SSc (n = 44), diffuse cutaneous SSc (dcSSc; n = 48), and other SSc‐related disorders (n = 22) were examined by enzyme‐linked immunosorbent assay and immunoblotting for AHA.Results. AHA were demonstrated in 29% of the 92 SSc patients and in 44% of those with dcSSc. The presence of AHA correlated with severe pulmonary fibrosis in those with dcSSc. Immunoblotting revealed that the predominant antigen was histone H1.Conclusion. AHA might be a serologic indicator of the severity of pulmonary fibrosis in SSc.

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