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- W3148668522 abstract "Sonic hedgehog (Shh) signaling has recently been shown to be involved in the pathological angiogenesis in response to tissue hypoxia and ischemic injury.Hypoxia/ischemia is considered to play an important role in the development of choroidal neovascularization (CNV).This study was aimed to examine the effect of blockade of the Shh signaling pathway on CNV and the underlying mechanism.A total of 64 male Brown-Norway (BN) rats were used in this study.One eye of each rat underwent laser photocoagulation.The other eye served as normal control.After the laser treatment, the 64 rats were divided into four groups (n=16 in each group):Blank control group, in which no intravitreal administration was given; cyclopamine group, recombinant Shh N-terminals protein (rShh) group and phosphate-buffered saline (PBS) group, in which cyclopamine (a Shh inhibitor), rShh (a Shh activator) and PBS were intravitreally injected into the laser-treated eyes respectively every other day for a total of four intravitreal injections immediately after the laser treatment.Fourteen days after the intravitreal administration, the changes of CNV-related variables, including positive CNV lesion percentage, CNV membrane area and CNV membrane thickness, were evaluated by fluorescein anqiography, indocyanine green angiography and pathological examinations.The mRNA and protein expression of PTCH1, Gli1, HIF-1α, VEGF and DLL4 in each group on 14 days of CNV model was detected by real-time quantitative PCR and western blot analysis, and the relationship between the Shh cascade and the HIF-1α-VEGF-DLL4 cascade in CNV was analyzed.The results showed that the CNV membrane area and the CNV membrane thickness were decreased by 62.5% and 41.9% in the cyclopamine group and increased by 85.7% and 64.3% in the rShh group in comparison to those in the blank control group (P<0.01 for each).There was no significant difference in the CNV membrane area and thickness between the blank control group and PBS group (P=0.102 and P=0.063, respectively).Real-time quant" @default.
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- W3148668522 date "2010-01-01" @default.
- W3148668522 modified "2023-10-18" @default.
- W3148668522 title "Blockade of the Sonic Hedgehog Signalling Pathway Inhibits Choroidal Neovascularization in a Laser-induced Rat Model" @default.
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