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Mediators of Inflammation
Volume 2013, Article ID 406483, 7 pages
http://dx.doi.org/10.1155/2013/406483
Clinical Study

Growth Arrest Specific Gene 6 Protein Concentration in Cerebrospinal Fluid Correlates with Relapse Severity in Multiple Sclerosis

1AOU “Maggiore della Carità,” 28100 Novara, Italy
2(Interdisciplinary Research Center of Autoimmune Diseases) IRCAD, Via Solaroli 17, 28100 Novara, Italy
3Department of Translational Medicine, “A. Avogadro” University, 28100 Novara, Italy

Received 29 January 2013; Revised 8 April 2013; Accepted 22 April 2013

Academic Editor: Carmen Guaza

Copyright © 2013 P. P. Sainaghi 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

Background. Growth arrest specific gene 6 (Gas6) protein enhances survival of oligodendrocytes and neurons, and it is involved in autoimmunity. Therefore, we aimed to verify whether cerebrospinal-fluid (CSF) Gas6 concentration may represent a biomarker of disease activity in multiple sclerosis. Methods. Sixty-five patients who underwent a spinal tap during relapse of relapsing/remitting multiple sclerosis (RR-MS)(McDonald-criteria) were studied. Forty patients affected by noninflammatory/nonautoimmune neurological diseases served as controls. Relapse was defined according to Schumacher criteria. Symptoms were grouped according to Kurtzke-Functional System (FS). Clinical characteristics of the relapse, duration, Expanded-Disability-Status Scale (EDSS) change, number of FS involved, completeness of recovery, age, steroid therapy, were categorised. Patients were followed at 6-month intervals to assess relapse rate and EDSS progression. Gas6 was measured (CSF, plasma) by in-house-enzyme-linked immunoassay (ELISA). Results. Higher CSF Gas6 concentrations were observed in relapses lasting ≤60 days (8.7 ± 3.9 ng/mL) versus >60 days (6.5 ± 2.6) or controls (6.5 ± 2.4; ), with ≤2 FS involved (8.5 ± 3.8) versus >2 FS (5.6 ± 2.5) ( ) and EDSS change ≤2.5 points (8.8 ± 3.7) versus >2.5 (6.5 ± 3.5) ( ). Conversely, CSF Gas6 was not predictive of the completeness of recovery. Plasma and CSF concentrations were not related ( ), and neither were predictive of relapse rate or EDSS progression after first relapse. Conclusions. CSF concentration of Gas6 is inversely correlated with the severity of relapse in RR-MS patients but does not predict the subsequent course of the disease.