Abstract
Purpose
Standard therapy for lupus nephritis is based on non-specific immunosuppression. We aimed to identify specific alterations in T cell and cytokine homeostasis and possible associations with disease activity in children with lupus nephritis (LN).
Methods
The phenotype of circulating T cells from children with LN and healthy controls (HC) was analyzed by flow cytometry. Intracellular expression of IL-17 and INF-γ was assessed after stimulation with anti-CD3 and anti-CD28. Serum concentrations of IP10, CCL2, TGF-β, IL-17, and IL-23 were measured by ELISA. Disease activity was determined using the Systemic Lupus Erythematosus Disease Activity Index 2000 update (SLEDAI-2K).
Results
Children with active LN displayed increased frequencies of effector memory CD4+CD45RO+CCR7− and terminal differentiated CD4+CD45RA+CCR7− T cells and reduced naive CD4+CD45RA+CCR7+ T cells compared to those with inactive LN or HC. Circulating CD4+CXCR3+ and CD4+CCR2+ T cells correlated inversely with the renal SLEDAI-2K, whereas IP10 and CCL2 showed a positive correlation. Reduced CD4+Foxp3+ T cells and serum TFG-β levels in active LN were associated with high serum IL-17 and IL-23 levels and correlated inversely with the renal SLEDAI-2K (r = −0.5855, p = 0.0013 and r = −0.6246, p = 0.0005, respectively), whereas IL-17 and IL-23 correlated positively (r = 0.5516, p = 0.0029 and r = 0.6116, p = 0.0007, respectively). Expansion of Th17 and Th1/Th17 cells in children with LN was significantly greater than in HC (p = 0.0304 and p = 0.0067, respectively).
Conclusion
Children with active LN display high levels of pro-inflammatory cytokines associated with an increase in effector T cells and reduction of regulatory T cells. Therapeutic regulation of the aberrant cytokine profile might specifically interrupt pathogenic mechanisms.
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Acknowledgments
This work was supported by OeNB Jubiläumsfonds Grant (13334) and Medizinischer Forschungsfonds Tirol grant to ME.
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The authors declare that they have no conflict of interest.
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This study is dedicated in memory of Prof. Dr. Lothar Bernd Zimmerhackl.
Electronic supplementary material
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Online Resource 1
Renal SLEDAI-2K, total SLEDAI-2K, and extra-renal manifestations of SLE at the time of sampling in children with active LN (PDF 56 kb)
Online Resource 2
Representative FACS dot plots showing the frequencies of circulating CD45RA+CCR7− (A1), CD45RA+CCR7+ (A2), CD45RA−CCR7− (A3), and CD45RA−CCR7+ (A4) cells on gated CD4+ T cells from a patient with active lupus nephritis (16.9%, 29.4%, 34.5%, and 19.2%, respectively), inactive lupus nephritis (12.7%, 39.4%, 27.5%, and 20.4%, respectively), and a control subject (5.2%, 47.4%, 22.1%, and 25.3%, respectively) (PDF 158 kb)
Online Resource 3
Increased frequency of CD69 expressing DNT cells in childhood LN. Leukocytes were stained with monoclonal antibodies to CD16/56, CD3, CD4, CD8, and CD69. Representative FACS dot plots show b) the frequencies of CD3+CD4−CD8− T cells (DNT) on gated CD3+CD16/56− cells, numbers indicate the percentage of CD3+CD4−CD8− cells and c expression of CD69 on gated DNT cells, numbers indicate the percentage of double positive cells (PDF 1.30 mb)
Online Resource 4
Reduced circulating CD4+CXCR3+ T cells in active childhood-onset LN. Representative FACS dot plots of CXCR3 expression in gated CD4+ T cells from a child with active LN, inactive LN, nephrotic syndrome (NS), and a control subject. Numbers indicate the percentage of double positive cells (PDF 493 kb)
Online Resource 5
Decrease of circulating CD4+Foxp3+ T cells in active childhood-onset LN. Representative examples of Foxp3 expression in circulating CD4+ T cells of a patient with active LN, inactive LN, nephrotic syndrome (NS), and a control subject. Numbers indicate the percentage of double positive cells (PDF 245 kb)
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Edelbauer, M., Kshirsagar, S., Riedl, M. et al. Activity of Childhood Lupus Nephritis is Linked to Altered T Cell and Cytokine Homeostasis. J Clin Immunol 32, 477–487 (2012). https://doi.org/10.1007/s10875-011-9637-0
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DOI: https://doi.org/10.1007/s10875-011-9637-0