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The myokine GDF-15 is a potential biomarker for myositis and associates with the protein aggregates of sporadic inclusion body myositis
Cytokine ( IF 3.7 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.cyto.2019.154966
Boel De Paepe 1 , Fien Verhamme 2 , Jan L De Bleecker 1
Affiliation  

BACKGROUND The cytokine growth differentiation factor-15 (GDF-15) has been associated with inflammatory and mitochondrial disease, warranting exploration of its expression in myositis patients. METHODS GDF-15 protein levels are evaluated in 35 idiopathic inflammatory myopathy (IIM) serum samples using enzyme-linked immunosorbent assays, comparing with levels in samples from healthy individuals and from patients with genetically confirmed hereditary muscular dystrophies and mitochondrial disorders. Muscle tissue expression of GDF-15 protein is evaluated using immunofluorescent staining and Western blotting. RESULTS GDF-15 protein levels are significantly higher in IIM sera (625 ± 358 pg/ml) than in that of healthy controls (326 ± 204 pg/ml, p = 0.01). Western blotting confirms increased GDF-15 protein levels in IIM muscle. In skeletal muscle tissue of IIM patients, GDF-15 localizes mostly to small regenerating or denervated muscle fibres. In patients diagnosed with sporadic inclusion body myositis, GDF-15 co-localizes with the characteristic protein aggregates within affected muscle fibres. CONCLUSIONS We describe for the first time that GDF-15 is a myokine upregulated in myositis and present the cytokine as a potential diagnostic serum biomarker.

中文翻译:

肌因子 GDF-15 是肌炎的潜在生物标志物,并与散发性包涵体肌炎的蛋白质聚集体相关

背景细胞因子生长分化因子-15 (GDF-15) 与炎症和线粒体疾病有关,值得探索其在肌炎患者中的表达。方法 使用酶联免疫吸附测定法评估 35 份特发性炎症性肌病 (IIM) 血清样本中的 GDF-15 蛋白水平,并将其与来自健康个体和经基因证实的遗传性肌营养不良症和线粒体疾病患者的样本中的水平进行比较。使用免疫荧光染色和蛋白质印迹评估 GDF-15 蛋白的肌肉组织表达。结果 IIM 血清中的 GDF-15 蛋白水平 (625 ± 358 pg/ml) 显着高于健康对照 (326 ± 204 pg/ml, p = 0.01)。蛋白质印迹证实 IIM 肌肉中 GDF-15 蛋白水平增加。在 IIM 患者的骨骼肌组织中,GDF-15 主要定位于小的再生或去神经支配的肌肉纤维。在诊断为散发性包涵体肌炎的患者中,GDF-15 与受影响肌肉纤维内的特征性蛋白质聚集体共定位。结论我们首次描述了 GDF-15 是肌炎中上调的肌因子,并将该细胞因子作为潜在的诊断血清生物标志物。
更新日期:2020-03-01
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