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Clinical and Developmental Immunology
Volume 2013 (2013), Article ID 390563, 7 pages
http://dx.doi.org/10.1155/2013/390563
Clinical Study

Assessment of T Regulatory Cells and Expanded Profiling of Autoantibodies May Offer Novel Biomarkers for the Clinical Management of Systemic Sclerosis and Undifferentiated Connective Tissue Disease

1Clinical Pathology and Microbiology, San Gallicano Dermatology Institute, Via Elio Chianesi 53, 00144 Rome, Italy
2Clinical Dermatology, San Gallicano Dermatology Institute, Via Elio Chianesi 53, 00144 Rome, Italy
3Biostatistic Unit, Regina Elena Cancer Institute, Via Elio Chianesi 53, 00144 Rome, Italy

Received 28 January 2013; Revised 21 March 2013; Accepted 11 April 2013

Academic Editor: Nicolaus Kroger

Copyright © 2013 Paola Cordiali-Fei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to identify disease biomarkers for the clinical and therapeutic management of autoimmune diseases such as systemic sclerosis (SSc) and undifferentiated connective tissue disease (UCTD), we have explored the setting of peripheral T regulatory (T reg) cells and assessed an expanded profile of autoantibodies in patients with SSc, including either limited (lcSSc) or diffuse (dcSSc) disease, and in patients presenting with clinical signs and symptoms of UCTD. A large panel of serum antibodies directed towards nuclear, nucleolar, and cytoplasmic antigens, including well-recognized molecules as well as less frequently tested antigens, was assessed in order to determine whether different antibody profiles might be associated with distinct clinical settings. Beside the well-recognized association between lcSSc and anti-centromeric or dcSSC and anti-topoisomerase-I antibodies, we found a significative association between dcSSc and anti-SRP or anti-PL-7/12 antibodies. In addition, two distinct groups emerged on the basis of anti-RNP or anti-PM-Scl 75/100 antibody production among UCTD patients. The levels of T reg cells were significantly lower in patients with SSc as compared to patients with UCTD or to healthy controls; in patients with lcSSc, T reg cells were inversely correlated to disease duration, suggesting that their levels may represent a marker of disease progression.