Integrin blocker polypeptide and its application in the preparation of drugs for the treatment of neovascular eye diseases
An integrin blocker and neovascularization technology, which is applied in cardiovascular system diseases, drug combinations, peptides, etc., can solve the problems of vascular specificity and selectivity, large dosage, and unclear targets. To achieve the effect of preventing or treating neovascular eye disease
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Embodiment 1
[0040] Inhibitory Effect of Integrin Blocker Peptides on Human Retinal Vascular Endothelial Cells (HRCEC) Proliferation.
[0041] MTT assay was used to detect the inhibitory activity of integrin blocker polypeptide on the proliferation of human retinal vascular endothelial cells. HRCEC cells were incubated at 37°C, 5% CO 2 When cultured in an incubator with a density of more than 90%, it was digested with trypsin and collected, and the cells were resuspended in culture medium and counted under a microscope, and the cell concentration was adjusted to 3.0×10 4 cells / mL, seed the cell suspension into a 96-well plate, 100 μL per well, and inoculate at 37°C, 5% CO 2 Incubate overnight in the incubator. Dilute polypeptide I, polypeptide II, and Avastin with culture medium to each predetermined concentration. After the cells were completely attached to the wall, each dilution was added to a 96-well plate, 100 μL per well. The addition of integrin blocker polypeptide was used as t...
Embodiment 2
[0056] In vivo anti-angiogenic activity of peptides analyzed in chicken chorioallantoic membrane (CAM)
[0057]In this study, CAM assay was used to investigate the activity of integrin blocker polypeptides in inhibiting angiogenesis in vivo. Studies have shown that the biosynthesis rate of collagen reaches the maximum from the 8th day to the 11th day of chicken embryo development, which is the most vigorous stage of angiogenesis, and the body's immune system has not yet been fully established, so it is selected to develop to the 8th day The chick embryos began to be administered. Considering that the polypeptide on the drug-loaded paper sheet has a certain diffusion range limitation on the chicken embryo allantoic membrane, only the new blood vessels within a radius of 5 mm from the edge of the paper sheet and the filter membrane within an angle of less than 45 degrees were counted in the test. quantity. Take the following steps:
[0058] (1) Cultivate the Bailaihang chicke...
Embodiment 3
[0066] Effect of Integrin Blocker Peptides on Corneal Neovascularization in Mice.
[0067] (1) Preparation of corneal neovascularization model induced by alkali burn in BALB / c mice:
[0068] Twenty healthy BALB / c mice, male, weighing 20-25 g, were examined under a slit-lamp microscope for the anterior segment and appendages of both eyes to exclude eye lesions. 0.3% ofloxacin eye drops were instilled 1 day before the preparation of the alkali burn model, twice a day. After mice were anesthetized by intraperitoneal injection of 1.8% Avertin, clamp a single-layer filter paper sheet with a diameter of 2mm with tweezers, soak it in 1mol / L sodium hydroxide solution to make it saturated, remove excess liquid, and spread the filter paper sheet evenly Stick it on the central cornea of BALB / c mice for 40 seconds, discard the filter paper, and immediately rinse the burn area and conjunctival sac with 15 mL of PBS for 1 min. Wipe off excess water with a cotton swab, and rotate the cor...
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