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2017 ; 2017
(ä): 9832430
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Adrenomedullin Regulates IL-1? Gene Expression in F4/80+ Macrophages during
Synovial Inflammation
#MMPMID28299347
Takano S
; Uchida K
; Miyagi M
; Inoue G
; Aikawa J
; Iwabuchi K
; Takaso M
J Immunol Res
2017[]; 2017
(ä): 9832430
PMID28299347
show ga
Adrenomedullin (AM) plays an important role in the regulation of inflammatory
processes; however, the role and expression of AM in synovial inflammation have
not been determined. To investigate the expression and role of AM in inflamed
synovial tissue (ST), the gene expression profiles of AM in the ST, including
synovial macrophages and fibroblasts, of a murine patellar surgical dislocation
model were characterized. In addition, the effects of interleukin- (IL-) 1? and
AM in cultured synovial cells were also examined. CD11c(+) macrophages were found
to be elevated in ST of the surgically dislocated patella. Higher gene expression
of CD11c, IL-1?, AM, receptor activity-modifying proteins 2 (RAMP2), and 3
(RAMP3) was also observed in ST obtained from the dislocated side. AM expression
was also significantly increased in synovial fibroblasts and macrophages in
response to IL-1? treatment. Synovial macrophages also highly expressed RAMP3
compared to fibroblasts and this expression was further stimulated by exogenously
added IL-1?. Further, the treatment of the F4/80-positive cell fraction obtained
from ST with AM inhibited IL-1? expression. Taken together, these findings
demonstrated that AM was produced by synovial fibroblasts and macrophages in
inflamed ST and that increased levels of AM may exert anti-inflammatory effects
on synovial macrophages.