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2014 ; 35
(ä): 143-51
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Biglycan-triggered TLR-2- and TLR-4-signaling exacerbates the pathophysiology of
ischemic acute kidney injury
#MMPMID24480070
Moreth K
; Frey H
; Hubo M
; Zeng-Brouwers J
; Nastase MV
; Hsieh LT
; Haceni R
; Pfeilschifter J
; Iozzo RV
; Schaefer L
Matrix Biol
2014[Apr]; 35
(ä): 143-51
PMID24480070
show ga
Exacerbated inflammation in renal ischemia-reperfusion injury, the major cause of
intrinsic acute renal failure, is a key trigger of kidney damage. During disease
endogenous danger signals stimulate innate immune cells via Toll-like receptors
(TLR)-2 and -4 and accelerate inflammatory responses. Here we show that
production of soluble biglycan, a small leucine-rich proteoglycan, is induced
during reperfusion and that it functions as endogenous agonist of TLR-2/4.
Biglycan-mediated activation of TLR-2/4 initiates an inflammatory response in
native kidneys, which is marked by the release of cytokines and chemokines and
recruitment of inflammatory cells. Overexpression of soluble circulating biglycan
before ischemic reperfusion enhanced plasma and renal levels of TNF-?, CXCL1,
CCL2 and CCL5, caused influx of neutrophils, macrophages and T cells and overall
worsened renal function in wild type mice. We provide robust genetic evidence for
TLR-2/4 requirement insofar as biglycan biological effects were markedly dampened
in mice deficient in both innate immune receptors, Tlr2(-/-);Tlr4(-/-) mice.
Thus, signaling of soluble biglycan via TLR-2/4 could represent a novel
therapeutic target for the prevention and possible treatment of patients with
acute renal ischemia-reperfusion injury.