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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Hypertens+Res
2015 ; 38
(1
): 21-9
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Angiotensin AT2 receptor stimulation is anti-inflammatory in
lipopolysaccharide-activated THP-1 macrophages via increased interleukin-10
production
#MMPMID25209104
Dhande I
; Ma W
; Hussain T
Hypertens Res
2015[Jan]; 38
(1
): 21-9
PMID25209104
show ga
Macrophages have an important role in the pathogenesis of hypertension and
associated end-organ damage via the activation of the Toll-like receptors, such
as Toll-like receptor-4 (TLR4). Accumulating evidence suggests that the
angiotensin AT2 receptor (AT2R) has a protective role in pathological conditions
involving inflammation and tissue injury. We have recently shown that AT(2)R
stimulation is renoprotective, which occurs in part via increased levels of
anti-inflammatory interleukin-10 (IL-10) production in renal epithelial cells;
however, the role of AT(2)R in the inflammatory activity of macrophages is not
known. The present study was designed to investigate whether AT(2)R activation
stimulates an anti-inflammatory response in TLR4-induced inflammation. The
effects of the anti-inflammatory mechanisms that occurred following pre-treatment
with the AT(2)R agonist Compound 21 (C21) (1 ?mol ml(-1)) on the cytokine
profiles of THP-1 macrophages after activation by lipopolysaccharide (LPS) (1 ?g
ml(-1)) were studied. The AT(2)R agonist dose-dependently attenuated LPS-induced
tumor necrosis factor-? (TNF-?) and IL-6 production but increased IL-10
production. IL-10 was critical for the anti-inflammatory effects of AT(2)R
stimulation because the IL-10-neutralizing antibody dose-dependently abolished
the AT(2)R-mediated decrease in TNF-? levels. Further, enhanced IL-10 levels were
associated with a sustained, selective increase in the phosphorylation of
extracellular signal-regulated kinase (ERK1/2) but not p38 mitogen-activated
protein kinase (MAPK). Blocking the activation of ERK1/2 before C21 pre-treatment
completely abrogated this increased IL-10 production in response to the AT(2)R
agonist C21, while there was a partial reduction in IL-10 levels following the
inhibition of p38. We conclude that AT(2)R stimulation exerts a novel
anti-inflammatory response in THP-1 macrophages via enhanced IL-10 production as
a result of sustained, selective ERK1/2 phosphorylation, which may have
protective roles in hypertension and associated tissue injury.
|Anti-Inflammatory Agents/*pharmacology/therapeutic use
[MESH]