Abstract：
:Systemic lupus erythematosus (SLE) is an autoimmune disease in which abnormal immune responses are mediated by tissue-binding autoantibodies and immune complex deposition. Because most SLE patients are women of child-bearing age, oestrogen has been suggested to play an important role in SLE pathogenesis. One proposed role is to induce B-cell activation, culminating in increased autoantibody production. Interleukin-21 (IL-21) has been shown to be crucial in the differentiation of activated B cells into plasma cells. We therefore hypothesized that oestrogen up-regulates IL-21 production and induces subsequent B-cell activation in SLE patients. Peripheral blood was obtained from 22 SLE patients and 16 healthy controls. Expression levels of IL-21 and its receptor in serum, peripheral blood mononuclear cells, and CD4(+) T cells were higher in SLE patients than in healthy controls. Exposure of CD4(+) T cells from SLE patients to 17β-oestradiol led to a dose- and time-dependent increase in IL-21 expression, which was abolished in the presence of mitogen-activated protein kinase (MAPK) (MAPK kinase, p38, Jun N-terminal kinase) inhibitors. B cells from healthy controls showed increased antibody production when they were co-cultured with oestrogen-treated CD4(+) T cells from SLE patients. Treatment with IL-21 antibody abrogated the increased antibody production of the co-culture systems. This study revealed the association between oestrogen and IL-21 in SLE patients. Oestrogen up-regulates IL-21 expression of CD4(+) T cells via MAPK-dependent pathways in SLE patients, which in turn induces increased antibody production by B cells.
journal_name
Immunologyjournal_title
Immunologyauthors
Lee J,Shin EK,Lee SY,Her YM,Park MK,Kwok SK,Ju JH,Park KS,Kim HY,Cho ML,Park SHdoi
10.1111/imm.12263subject
Has Abstractpub_date
2014-08-01 00:00:00pages
573-80issue
4eissn
0019-2805issn
1365-2567journal_volume
142pub_type
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