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Expression, Purification, and Antimicrobial Activity of S100A12
Published on: May 13, 2017
S100A12 Is Associated with Response to Therapy in Juvenile Idiopathic Arthritis
Faekah Gohar1,2, Janneke Anink1,2, Halima Moncrieffe1,2
1From the Department of Pediatric Rheumatology and Immunology, University Children's Hospital Münster, Münster, Germany; Department of Pediatrics/Pediatric Rheumatology, Erasmus MC Sophia Children's Hospital Rotterdam, Rotterdam, the Netherlands; Center for Autoimmune Genomics and Etiology, Cincinnati Children's Hospital Medical Center; Department of Pediatrics, University of Cincinnati, College of Medicine, Cincinnati, Ohio, USA; Emma Children's Hospital, Academic Medical Centre and Amsterdam Rheumatology and Immunology Centre, Reade location, Jan van Breemen Institute; Department of Pediatrics/Pediatric Rheumatology, Onze Lieve Vrouwe Gasthuis, Amsterdam; Department of Pediatrics/Pediatric Rheumatology, St. Maartenskliniek and Radboud University Medical Centre, Nijmegen; Leiden University Medical Centre, Leiden, the Netherlands; School of Biological Sciences, Royal Holloway, University of London; Infection, Immunity, Inflammation Programme, University College London (UCL) Great Ormond Street (GOS) Institute of Child Health; UK National Institute for Health Research (NIHR) GOS Hospital Biomedical Research Centre (BRC); Arthritis Research UK Centre for Adolescent Rheumatology at UCL, London, UK; Centre of Pediatric Rheumatology, Department of General Pediatrics, Asklepios Clinic Sankt Augustin, Sankt Augustin; German Pediatric Pain Centre, Children's and Adolescents' Hospital, Datteln; Klinik für Kinderheilkunde III, Zentrum für Kinder- und Jugendmedizin, Universitätsklinikum Essen, Essen, Germany.
Objective:
Around one-third of patients with juvenile idiopathic arthritis (JIA) fail to respond to first-line methotrexate (MTX) or anti-tumor necrosis factor (TNF) therapy, with even fewer achieving ≥ American College of Rheumatology Pediatric 70% criteria for response (ACRpedi70), though individual responses cannot yet be accurately predicted. Because change in serum S100-protein myeloid-related protein complex 8/14 (MRP8/14) is associated with therapeutic response, we tested granulocyte-specific S100-protein S100A12 as a potential biomarker for treatment response.
Methods:
S100A12 serum concentration was determined by ELISA in patients treated with MTX (n = 75) and anti-TNF (n = 88) at baseline and followup. Treatment response (≥ ACRpedi50 score), achievement of inactive disease, and improvement in Juvenile Arthritis Disease Activity Score (JADAS)-10 score were recorded.
Results:
Baseline S100A12 concentration was measured in patients treated with anti-TNF [etanercept n = 81, adalimumab n = 7; median 200, interquartile range (IQR) 133-440 ng/ml] and MTX (median 220, IQR 100-440 ng/ml). Of the patients in the anti-TNF therapy group, 74 (84%) were also receiving MTX. Responders to MTX (n = 57/75) and anti-TNF (n = 66/88) therapy had higher baseline S100A12 concentration compared to nonresponders: median 240 (IQR 125-615) ng/ml versus 150 (IQR 87-233) ng/ml, p = 0.021 for MTX, and median 308 (IQR 150-624) ng/ml versus 151 (IQR 83-201) ng/ml, p = 0.002, for anti-TNF therapy. Followup S100A12 could be measured in 44/75 MTX-treated patients (34/44 responders) and 39/88 anti-TNF-treated patients (26/39 responders). Responders had significantly reduced S100A12 concentration (MTX: p = 0.031, anti-TNF: p < 0.001) at followup versus baseline. Baseline serum S100A12 in both univariate and multivariate regression models for anti-TNF therapy and univariate analysis alone for MTX therapy was significantly associated with change in JADAS-10.
Conclusion:
Responders to MTX or anti-TNF treatment can be identified by higher pretreatment S100A12 serum concentration levels.
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