Notice of RetractionPurification and Bioactivity of the Angiogenesis Inhibitor DCAIF-II from the Cartilage of Dasyatis akajei: Angiogenesis Inhibitor DCAIF-II from the Cartilage of Dasyatis akajei

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

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Guided by anti-angiogenesis activity, a new angiogenesis inhibitor DCAIF-II was isolated from the cartilage of Dasyatis akajei. By phosphate buffer extraction, refrigerated centrifugation, ultrafiltration, 30%-60% ammonium sulphate precipitation, dialysis and refrigerated desiccation, the fraction DCCE with higher anti-angiogenesis active was obtained from the cartilage of D. akajei. Using ion exchange chromatography and gel filtration chromatography, DCAIF-II was purified from DCCE and homogeneous as a single band of 58.2 kDa in 12% SDS-PAGE stained with coomasie brilliant blue. The bioactivity of the DCAIF-II was investigated by inhibiting the formation of the blood vessels in the chick embryo chorioallantoic membrane (CAM). The ratio between the vascular area and the non vascular area (VA/NVA) in sampling point was used for quantitative analysis of the inhibitory effect of DCAIF-II. Compared with the control group (phosphate buffer and chondroitine sulfate), the sampling point of the DCAIF-II group had significantly lower VA/NVA. A large area of blood vessels in sampling point was significantly faded and the vascular structure was blurred with broken branches accompanied by the decreased density of vessels. The finding indicated that the DCAIF-II from the cartilage of D. akajei had an angiogenesis inhibitory effect, and there was also a positive correlation between the concentration and the inhibitory effect.