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Background  The role of naturally occurring regulatory T cells (Treg) in the control of the development of systemic lupus erythematosus (SLE) has not been well defined. Therefore, we dissect the phenotypically heterogeneous CD4 + FoxP3 +  T cells into subpopulations during the dynamic SLE development.    Methodlogy/Principal Findings  To evaluate the proliferative and suppressive capacities of different CD4 +  T cell subgroups between active SLE patients and healthy donors, we employed CD45RA and CD25 as surface markers and carboxyfluorescein diacetatesuccinimidyl ester (CFSE) dilution assay. In addition, multiplex cytokines expression in active SLE patients was assessed using Luminex assay. Here, we showed a significant increase in the frequency of CD45RA + FoxP3 low  naive Treg cells (nTreg cells) and CD45RA − FoxP3 low  (non-Treg) cells in patients with active SLE. In active SLE patients, the increased proportions of CD45RA + FoxP3 low  nTreg cells were positively correlated with the disease based on SLE disease activity index (SLEDAI) and the status of serum anti-dsDNA antibodies. We found that the surface marker combination of CD25 + CD45RA +  can be used to defined CD45RA + FoxP3 low  nTreg cells for functional assays, wherein nTreg cells from active SLE patients demonstrated defective suppression function. A significant correlation was observed between inflammatory cytokines, such as IL-6, IL-12 and TNFα, and the frequency of nTreg cells. Furthermore, the CD45RA + FoxP3 low  nTreg cell subset increased when cultured with SLE serum compared to healthy donor serum, suggesting that the elevated inflammatory cytokines of SLE serum may promote nTreg cell proliferation/expansion.    Conclusions/Significance  Our results indicate that impaired numbers of functional CD45RA + FoxP3 low  naive Treg cell and CD45RA − FoxP3 low  non-suppressive T cell subsets in inflammatory conditions may contribute to SLE development. Therefore, analysis of subsets of FoxP3 +  T cells, using a combination of FoxP3, CD25 and CD45RA, rather than whole FoxP3 +  T cells, will help us to better understand the pathogenesis of SLE and may lead to the development of new therapeutic strategies.

Increased CD45RA+FoxP3low Regulatory T Cells with Impaired Suppressive Function in Patients with Systemic Lupus Erythematosus