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The role of microRNA-1246 in the regulation of B cell activation and the pathogenesis of systemic lupus erythematosus.

Abstract：

BACKGROUND:The pathogenesis of systemic lupus erythematosus (SLE) has not yet been completely elucidated. One of the hallmarks of SLE is the production of autoantibodies by uncontrolled over-activated B cells. Early B cell factor 1 (EBF1) contributes to the development, activation, and proliferation of B cells through activation of the AKT signaling pathway. Accumulating evidence has demonstrated that several microRNAs (miRNAs) contribute to the pathogenesis of autoimmune diseases through the regulation of B cells in SLE. We aim to investigate the expression patterns of miR-1246 in B cells and its contribution to pathogenesis of SLE. RESULTS:Our results showed that the expression of miR-1246 was significantly decreased in B cells from SLE patients. We verified that miR-1246 specifically targeted the EBF1 messenger RNA (mRNA) by interacting with its 3'-untranslated region (3'-UTR) and regulated the expression of EBF1. Transfection of miR-1246 inhibitors into healthy B cells upregulated the expression of EBF1, enhanced B cell function, and increased the production of B cell surface co-stimulatory molecules CD40, CD80, and CD86. We also observed that abnormal activation of the AKT signaling pathway was associated with decreased P53 expression, leading to the downregulation of the miR-1246 expression; and upregulation of the miR-1246 expression reversed the responsiveness of B cells by inhibiting EBF1 expression. CONCLUSIONS:Activated B cells in lupus could decrease the expression of miR-1246 through the AKT-P53 signaling pathway, which in turn enhances the expression of EBF1, thereby promoting further activation of B cells. Conversely, upregulation of miR-1246 could interrupt this amplification pathway. Our findings thus provide a theoretical framework towards the research of novel biological targets in SLE treatment.

journal_name

Clin Epigenetics

journal_title

Clinical epigenetics

authors

Luo S,Liu Y,Liang G,Zhao M,Wu H,Liang Y,Qiu X,Tan Y,Dai Y,Yung S,Chan TM,Lu Q

doi

10.1186/s13148-015-0063-7

subject

Has Abstract

pub_date

2015-03-14 00:00:00

pages

24

eissn

1868-7075

issn

1868-7083

pii

63

journal_volume

7

pub_type

杂志文章

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