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2017 ; 7
(ä): 44911
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Angiotensin II induces kidney inflammatory injury and fibrosis through binding to
myeloid differentiation protein-2 (MD2)
#MMPMID28322341
Xu Z
; Li W
; Han J
; Zou C
; Huang W
; Yu W
; Shan X
; Lum H
; Li X
; Liang G
Sci Rep
2017[Mar]; 7
(ä): 44911
PMID28322341
show ga
Growing evidence indicates that angiotensin II (Ang II), a potent biologically
active product of RAS, is a key regulator of renal inflammation and fibrosis. In
this study, we tested the hypothesis that Ang II induces renal inflammatory
injury and fibrosis through interaction with myeloid differentiation protein-2
(MD2), the accessory protein of toll-like receptor 4 (TLR4) of the immune system.
Results indicated that in MD2(-/-) mice, the Ang II-induced renal fibrosis,
inflammation and kidney dysfunction were significantly reduced compared to
control Ang II-infused wild-type mice. Similarly, in the presence of small
molecule MD2 specific inhibitor L6H21 or siRNA-MD2, the Ang II-induced increases
of pro-fibrotic and pro-inflammatory molecules were prevented in tubular NRK-52E
cells. MD2 blockade also inhibited activation of NF-?B and ERK. Moreover, MD2
blockade prevented the Ang II-stimulated formation of the MD2/TLR4/MyD88
signaling complex, as well as the increased surface binding of Ang II in NRK-52E
cells. In addition, Ang II directly bound recombinant MD2 protein, rather than
TLR4 protein. We conclude that MD2 is a significant contributor in the Ang
II-induced kidney inflammatory injury in chronic renal diseases. Furthermore, MD2
inhibition could be a new and important therapeutic strategy for preventing
progression of chronic renal diseases.