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2016 ; 13
(6
): 764-775
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Activation of TLR7 increases CCND3 expression via the downregulation of miR-15b
in B cells of systemic lupus erythematosus
#MMPMID26144250
Ren D
; Liu F
; Dong G
; You M
; Ji J
; Huang Y
; Hou Y
; Fan H
Cell Mol Immunol
2016[Nov]; 13
(6
): 764-775
PMID26144250
show ga
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by
B-cell hyperreactivity. The Toll-like receptor 7 (TLR7) signaling pathway is
abnormally activated in SLE B cells. CyclinD3 (CCND3) plays an important role in
B-cell proliferation, development, and differentiation. Although previous studies
focused on the B cell-intrinsic role of TLR7 for the development of spontaneous
germinal centers, the influence of TLR7 on CCND3 in SLE B cells is still not
clear. Here, we used a B-cell profiling chip and found that CCND3 was related to
SLE and significantly elevated in SLE B cells. Moreover, we determined that the
expression level of CCND3 was higher, while miR-15b was significantly lower in
the B cells from SLE patients and B6.MRL-Faslpr/J lupus mice compared to normal
subjects. Furthermore, we demonstrated that the activation of TLR7 dramatically
increased CCND3 expression but significantly decreased miR-15b in B cells in
vitro and we identified that CCND3 is a direct target of miR-15b. To further
confirm our results, we established another lupus model by topically treating
C57BL/6 (B6) mice with the TLR-7 agonist imiquimod (IMQ) for 8 weeks according to
the previously described protocol. Expectedly, topical treatment with IMQ also
significantly increased CCND3 and decreased miR-15b in B cells of B6 mice. Taken
together, our results identified that the activation of TLR7 increased CCND3
expression via the downregulation of miR-15b in B cells; thus, these findings
suggest that extrinsic factor-induced CCND3 expression may contribute to the
abnormality of B cell in SLE.