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2017 ; 198
(7
): 2661-2670
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Metformin Suppresses Systemic Autoimmunity in Roquin(san/san) Mice through
Inhibiting B Cell Differentiation into Plasma Cells via Regulation of
AMPK/mTOR/STAT3
#MMPMID28242651
Lee SY
; Moon SJ
; Kim EK
; Seo HB
; Yang EJ
; Son HJ
; Kim JK
; Min JK
; Park SH
; Cho ML
J Immunol
2017[Apr]; 198
(7
): 2661-2670
PMID28242651
show ga
Circulating autoantibodies and immune complex deposition are pathological
hallmarks of systemic lupus erythematosus (SLE). B cell differentiation into
plasma cells (PCs) and some T cell subsets that function as B cell helpers can be
therapeutic targets of SLE. Mechanistic target of rapamycin (mTOR) signaling is
implicated in the formation of B cells and germinal centers (GCs). We assessed
the effect of metformin, which inhibits mTOR, on the development of autoimmunity
using Roquin(san/san) mice. Oral administration of metformin inhibited the
formation of splenic follicles and inflammation in kidney and liver tissues. It
also decreased serum levels of anti-dsDNA Abs without affecting serum glucose
levels. Moreover, metformin inhibited CD21(high)CD23(low) marginal zone B cells,
B220(+)GL7(+) GC B cells, B220(-)CD138(+) PCs, and GC formation. A significant
reduction in ICOS(+) follicular helper T cells was found in the spleens of the
metformin-treated group compared with the vehicle-treated group. In addition,
metformin inhibited Th17 cells and induced regulatory T cells. These alterations
in B and T cell subsets by metformin were associated with enhanced AMPK
expression and inhibition of mTOR-STAT3 signaling. Furthermore, metformin induced
p53 and NF erythroid-2-related factor-2 activity in splenic CD4(+) T cells. Taken
together, metformin-induced alterations in AMPK-mTOR-STAT3 signaling may have
therapeutic value in SLE by inhibiting B cell differentiation into PCs and GCs.
|AMP-Activated Protein Kinases/drug effects/immunology
[MESH]