Abstract
Soluble progranulin (PGRN) is known to directly regulate regulatory T cells; however, whether PGRN levels are elevated in patients with rheumatoid arthritis and affect the regulatory subsets of B cells remain unknown. In this study, a total of 80 RA patients and 60 healthy controls were studied. Serum progranulin levels were determined using enzyme-linked immune-sorbent assay. A receiver operating characteristic (ROC) curve was used to evaluate the feasibility of serum PGRN as a biomarker for distinguishing patients with RA. CD19+CD5+GrB+ B cells were analyzed by flow cytometry in peripheral blood mononuclear cells (PBMCs). Serum progranulin levels in RA patients (median, 59.4 ng/mL) and in RA patients DAS28 > 5.1 (median, 71.98 ng/mL) were much higher than those in normal controls (median, 46.3 ng/mL; P < 0.001). The area under the ROC curve for progranulin levels was 0.705 for RA versus normal controls and the area under the ROC curve for progranulin levels in RA patients DAS28 > 5.1 was 0.977 versus normal controls (P < 0.001). Interestingly, serum progranulin and DAS28, CRP, ESR were all positively correlated in RA patients (P < 0.001). The number of CD19+CD5+GrB+ B cells was significantly higher in RA patients (P < 0.05); however, the level of Breg cells was not related to PGRN (P > 0.05). Our findings indicated that induction of PGRN expression may play a role in RA immune reaction and PGRN levels could be a useful biomarker in RA inflammatory response, but irrelated with Breg cell levels.
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Supported by Grant 15EZC2 from the Enze medical center scientific research funds and Grant 1401ky05 from Taizhou science and technology plan.
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Chen, J., Li, S., Shi, J. et al. Serum progranulin irrelated with Breg cell levels, but elevated in RA patients, reflecting high disease activity. Rheumatol Int 36, 359–364 (2016). https://doi.org/10.1007/s00296-015-3372-4
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DOI: https://doi.org/10.1007/s00296-015-3372-4