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2017 ; 7
(1
): 15062
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An apelin receptor antagonist prevents pathological retinal angiogenesis with
ischemic retinopathy in mice
#MMPMID29118394
Ishimaru Y
; Shibagaki F
; Yamamuro A
; Yoshioka Y
; Maeda S
Sci Rep
2017[Nov]; 7
(1
): 15062
PMID29118394
show ga
Pathological retinal angiogenesis is caused by the progression of ischemic
retinal diseases and can result in retinal detachment and irreversible blindness.
This neovascularization is initiated from the retinal veins and their associated
capillaries and involves the overgrowth of vascular endothelial cells. Since
expression of the apelin receptor (APJ) is restricted to the veins and
proliferative endothelial cells during physiological retinal angiogenesis, in the
present study, we investigated the effect of APJ inhibition on pathological
retinal angiogenesis in a mouse model of oxygen-induced retinopathy (OIR). In
vitro experiments revealed that ML221, an APJ antagonist, suppressed
cultured-endothelial cell proliferation in a dose-dependent manner.
Intraperitoneal administration of ML221 inhibited pathological angiogenesis but
enhanced the recovery of normal vessels into the ischemic regions in the retina
of the OIR model mice. ML221 did not affect the expression levels of vascular
endothelial growth factor (VEGF) and its receptor (VEGFR2) in the retina. APJ was
highly expressed in the endothelial cells within abnormal vessels but was only
detected in small amounts in morphologically normal vessels. These results
suggest that APJ inhibitors selectively prevent pathological retinal angiogenesis
and that the drugs targeting APJ may be new a candidate for treating ischemic
retinopathy.