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Ординатура / Офтальмология / Английские материалы / Retinal Degenerative Diseases Laboratory and Therapeutic Investigations_Anderson_2008.pdf
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342

J. Hu et al.

Protamine sulfate is a common, inexpensive anti-coagulation drug widely used for anti-coagulation in cases when heparin has been overused in the clinic. Recent studies suggest that protamine sulfate can inhibit tumor growth, probably through inhibiting vascular growth of the tumor. In this study we showed that protamine sulfate could inhibit VEGF and the binding of VEGF and its receptor, implying that protamine sulfate may inhibit blood vessel growth through inhibition of the VEGF pathway. This study further suggested that protamine sulfate may be potentially used to treat angiogenic eye diseases.

39.1 Materials and Methods

39.1.1 Cell Culture

Monkey retinal vascular endothelial cells (RF/6A) cells were cultured under normal oxygen or hypoxic condition. The hypoxic condition was modified based on the description of Eichler et al. (2004). In brief, the cell culture plate was put into a plastic bag, and the plastic bag was sealed completely. The mixture gas of 950 ml/L N2, 35 ml/L CO2 and 15 ml/L O2 was supplied through oxygen pipe. A plastic bag with cell culture plate was then put into a 37C cell incubator, and the mixture gas was supplied every 24 h. Different concentrations of protamine sulfate (0, 20, 40, 80, 160 ug/ml) were added to the medium of the cultured cells after passage of 24 h. The concentration of VEGF in the medium was measured by ELISA method at different times after the protamine sulfate was added (0, 24, 48, 96 h). Four days after the passage, the cells fully covered the plates; immunocytochemical (ICC) analysis was then performed on the cells to determine the binding efficiency of VEGF and its receptor.

39.1.2Semi-Quantitative Assay of VEGF Expression in the Culture Cells by ICC

Two methods of scoring were used for the semi-quantitative of VEGF expression in the culture cells by ICC. In the first method, the cells were scored according to the density of the ICC staining, in which 0 represents no staining, 1 represents light staining, 2 represents staining with brown-yellow color, and 3 represents dark brown color. The total scores were obtained by multiplying the score of each group times the percentage of cells in the group. The second method of score was based on the condition of the staining particle, 1 for small-particle staining cells, 2 for clear particle-staining cells and 3 for big, dark-staining cells. The total scores were obtained by multiplying the score of each group times the percentage of cells in the group. The final scores were determined by adding the scores from the first method with the scores from the second method. Five fields were randomly selected for analysis. The data were further analyzed through MetaMorph/DP10/BX41 microimaging analyzer system for semi-quantity of VEGF expression.