An siRNA (small interfering RNA) targeting zebrafish VEGF (vascular endothelial growth factor) gene was designed and synthesized by chemical synthesis. Its effect on zebrafish angiogenesis was evaluated. To obtain stable regulation of VEGF expression, shRNA (short hairpin RNA) transcription vector was constructed by inserting the annealed forward and reverse synthetic oligonucleotides into the downstream of CMV promoter. Quantitative endogenous alkaline phosphatase (EAP) assay showed that 71.8% of angiogenesis was detected following the injection of synthetic siRNA. Alkaline phosphatase staining using NBT and BCIP indicated that the vector constructed could cause specific subintestinal veins (SIV) and intersegmental vessels (Se) vascular development defects. In situ hybridization showed that the expression of VEGF in the brain and anterior pronephric ducts region were anomaly.
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