Objective: We aimed to investigate the potential of Growth Differentiation Factor 15 (GDF-15) as a novel biomarker for disease activity in Juvenile Dermatomyositis (JDM).
Methods: We recruited children with juvenile myositis including juvenile dermatomyositis (n = 77), polymyositis (n = 6), and healthy controls (n = 22). GDF-15 levels in plasma were measured using ELISA. Statistical analyses were performed using non-parametric tests.
Results: Levels of GDF-15 were significantly elevated in JDM compared with healthy controls (p< 0.001). GDF-15 levels exhibited strong positive correlations with disease activity scores, including the Disease Activity Score (DAS) total score, DAS skin score, DAS muscle score, and Childhood Myositis Assessment Scale (CMAS). Additionally, GDF-15 levels could differentiate between active disease and remission based on the Physician Global Assessment of muscle score. Positive correlations were observed between levels of GDF-15 and creatine kinase, neopterin, and nailfold end row loops, indicating the potential involvement of GDF-15 in muscle damage, immune activation, and vascular pathology. ROC curve analysis showed GDF-15 to be more effective in assessing disease activity in JDM than creatine kinase (AUC 0.77, p= 0.001 and AUC 0.6369, p= 0.0738, respectively).
Conclusion: GDF-15 may serve as a valuable biomarker for assessing disease activity in JDM. It exhibits better sensitivity and specificity than creatine kinase, and the levels correlate with various disease activity scores and functional measures. GDF-15 may provide valuable information for treatment decision-making and monitoring disease progression in JDM.
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