Abstract
Gene expression analysis of peripheral blood cells may provide valuable information about the triggered molecular processes in systemic lupus erythematosus (SLE). The study aimed to quantify the mRNA in peripheral blood of seven target genes, including inflammatory cytokine genes (IL23A, IL12B, TNFA, IL18), and T regulatory-related genes (FOXP3, TGFB1, IL10) in patients with SLE and to correlate expression levels with disease activity and/or clinical manifestations. The relative quantification of target genes was performed using real-time polymerase chain reaction in peripheral blood obtained from 28 adult SLE females and 17 healthy women. The highest up-regulation in the blood of SLE patients was observed for IL23A with a median 9.54 (p < 0.0001), followed by TGFB1 (median: 2.07; p = 0.047) and IL10 (median: 1.84; p = 0.013). IL12B and TNFA were significantly down-regulated in patients compared to controls (median: 0.521; p = 0.0023, and median: 0.519; p = 0.0003, respectively). FOXP3 mRNA was lower among patients with higher degree of disease activity (median: 0.338; p = 0.029) and showed inverse correlation with Systemic Lupus Erythematosus Disease Activity Index (SLEDAI). IL18 mRNA correlated positively with the SLEDAI and was highly expressed during severe flares (median: 1.216; p = 0.021). IL18 up-regulation was associated with anti-dsDNA antibody positivity, while FOXP3 down-regulation with lupus nephritis. Our study pointed out the relationship of SLE disease activity and particular clinical manifestations with IL18 and FOXP3 expression, and the significant contribution of IL23A in the SLE immunopathogenesis. Hence, the peripheral blood cytokine mRNAs should be exploited as novel prognostic and diagnostic biomarkers.
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This work was supported by Grants No. 2/2017 and No. 2/2018 from the Fund for Scientific and Mobile Project from the Trakia University, Medical Faculty, Stara Zagora, Bulgaria.
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LM, IM, MI, RS, and SS made substantial contributions to the conception or design of the work. MI and RS, assessed participants, analyzed and interpreted the data. LM, IM and SS performed the analyses, collected and interpreted the data. LM drafted the manuscript. RS and SS supervised the project. All authors read, revising and approved the final manuscript version and take full responsibility for the integrity of the study and the manuscript.
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Miteva L, Manolova I, Ivanova M, Stoilov R and Stanilova S declare that they have no conflict of interests.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the local Ethics Committee of the University Hospital “St. Ivan Rilski”, Sofia, Bulgaria with a decision number #6, 29 Nov 2016.
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Miteva, L.D., Manolova, I.M., Ivanova, M.G. et al. High interleukin-18 and low FOXP3 mRNAs in peripheral blood of women with severe systemic lupus erythematosus: a cross-sectional study. Rheumatol Int 40, 727–735 (2020). https://doi.org/10.1007/s00296-020-04542-3
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DOI: https://doi.org/10.1007/s00296-020-04542-3