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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 Am+J+Pathol
2014 ; 184
(6
): 1706-14
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Endothelin-1 activation of the endothelin B receptor modulates pulmonary
endothelial CX3CL1 and contributes to pulmonary angiogenesis in experimental
hepatopulmonary syndrome
#MMPMID24731444
Zhang J
; Yang W
; Hu B
; Wu W
; Fallon MB
Am J Pathol
2014[Jun]; 184
(6
): 1706-14
PMID24731444
show ga
Hepatic production and release of endothelin-1 (ET-1) binding to endothelin B
(ETB) receptors, overexpressed in the lung microvasculature, is associated with
accumulation of pro-angiogenic monocytes and vascular remodeling in experimental
hepatopulmonary syndrome (HPS) after common bile duct ligation (CBDL). We have
recently found that lung vascular monocyte adhesion and angiogenesis in HPS
involve interaction of endothelial C-X3-C motif ligand 1 (CX3CL1) with monocyte
CX3C chemokine receptor 1 (CX3CR1), although whether ET-1/ETB receptor activation
influences these events is unknown. Our aim was to define if ET-1/ETB receptor
activation modulates CX3CL1/CX3CR1 signaling and lung angiogenesis in
experimental HPS. A selective ETB receptor antagonist, BQ788, was given for 2
weeks to 1-week CBDL rats. ET-1 (ħBQ788) was given to cultured rat pulmonary
microvascular endothelial cells overexpressing ETB receptors. BQ788 treatment
significantly decreased lung angiogenesis, monocyte accumulation, and CX3CL1
levels after CBDL. ET-1 treatment significantly induced CX3CL1 production in lung
microvascular endothelial cells, which was blocked by inhibitors of Ca(2+) and
mitogen-activated protein kinase (MEK)/ERK pathways. ET-1-induced ERK activation
was Ca(2+) independent. ET-1 administration also increased endothelial tube
formation in vitro, which was inhibited by BQ788 or by blocking Ca(2+) and
MEK/ERK activation. CX3CR1 neutralizing antibody partially inhibited ET-1 effects
on tube formation. These findings identify a novel mechanistic interaction
between the ET-1/ETB receptor axis and CX3CL1/CX3CR1 in mediating pulmonary
angiogenesis and vascular monocyte accumulation in experimental HPS.