[44] Treatment of NZB/W F1 mice with soluble TACI-Ig fusion protein prevented the development

of proteinuria and prolonged the survival of the animals.[44] These findings underscored the involvement of CDK phosphorylation BLys and its receptors in the development of SLE and hence the TACI-Ig was proposed as a promising treatment for human autoimmune disease. Furthermore, mice treated with exogenous BLys showed increased numbers of anti-chromatin B cells and augmented anti-dsDNA production.[45] Deletion of either BLys or BR3 critically impaired B cell maturation beyond the transitional developmental stages.[37, 40, 44, 46] T cell-deficient BAFF transgenic (Tg) mice developed SLE similar to T cell-sufficient BAFF Tg mice, and such features were associated with innate B lymphocyte Ivacaftor manufacturer activation and pro-inflammatory autoantibodies release. These data suggest that a dysregulated innate activation of B cells alone can drive disease independently of the T cells.[47] In human lupus patients, the circulating BLys level was raised in human lupus and is correlated with the anti-dsDNA level.[48] In a survey which measured the serum BLys level and disease activities, healthy subjects universally exhibits a normal longitudinal serum BLys profile, whereas escalated BLys level was observed in SLE patients (persistent rise in 25% and intermittent increase in another 25% of patients).

Increased cerebrospinal fluid levels of a proliferation-inducing ligand (APRIL) are also observed SLE patients with neuropsychiatric manifestations. The antagonism of BLys has been one of the important progresses in the treatment of SLE. Recently, belimumab Unoprostone was approved by the Food and Drug Administration (FDA) for the treatment of SLE. The efficacy and safety of belimumab in active SLE had been evaluated by two large multicentre randomized control trials. Both studies have demonstrated that the use of belimumab is associated with significant improvement in the SLE Responder Index (defined as ≥4 points improvement in SLEDAI) at 52 weeks, reduced SLE activity

and severe flares, as well as a comparable tolerability profile to placebo.[33, 34] Analysis of the pooled data from these two large trials showed that belimumab treatment improved overall SLE disease activity mostly in the musculoskeletal and mucocutaneous organ domains and less deterioration occurred in the haematological, immunological and renal domains.[49] In a post-hoc analysis of the BLISS study, the rates of renal flare, renal remission, renal organ disease improvement, proteinuria reduction and serologic activity all favoured belimumab, although the between-group differences in most renal outcomes were not significant. Among the 267 patients with renal involvement at baseline, belimumab resulted in greater renal improvement among patients receiving mycophenolate mofetil or those with active serology at baseline when compared with placebo.