高壓力培養(yǎng)下角膜內(nèi)皮細(xì)胞凋亡的啟動(dòng)機(jī)制
[Abstract]:Objective to investigate the mechanism of corneal endothelial cell apoptosis in high pressure culture. Methods the primary rabbit corneal endothelial cells were identified by immunohistochemistry and cultured under 50mm Hg (1 k Pa=7.5 mm Hg) pressure) for 1 h, 2 h, 24 h. The normal pressure (15 mm Hg) was used as the normal pressure group and cultured for 24 h. After the fusion of the first generation rabbit corneal endothelial cells reached 70% / 80%, the cells were pretreated with 10 ~ (- 6) mol 路L ~ (- 1) anti-Caspase-8 and anti-Caspase-9 at the concentration of 10 ~ (- 6) mol 路L ~ (- 1) and then placed in a pressure device. The pressure was set at 50 mm Hg, for 24 h to detect the expression of protein Bcl-2 and p53, and the control group was treated with 50 mm Hg pressured cells without inhibitor. The expression of Bcl-2 and p53 were detected by Western blot. The content of cytoplasmic cytochrome C (cytochrome C) in rabbit corneal endothelial cells was detected by immunofluorescence staining. Results the expression of p53 in 50 mm Hg pressure group was 0.651 鹵0.007, 0.805 鹵0.006,0.839 鹵0.011, respectively, which was higher than that in normal pressure group (0.033 鹵0.004). The difference was statistically significant (all P0.01). The expression of p53 protein in corneal endothelial cells increased gradually with the prolongation of the pressure time in 50 mm Hg pressure group (all P0.01). In 50 mm Hg pressure group, the expression of p53 protein increased at 1 h, 2 h, and in the 50 mm Hg pressure group, the expression of p53 protein increased gradually with the prolongation of the pressure time (all P0.01). The expression of Bcl-2 in 24 h group was 0.590 鹵0.009,0.724 鹵0.005,0.314 鹵0.016, which was significantly higher than that in normal pressure group (0.081 鹵0.013) (P0.01). There was significant difference in each time of 50 mm Hg pressure group (P 0.01). It was found that after 24 hours of culture in the normal pressure group, the nucleus was blue and no cytochrome C release was found in the cytoplasm. In the 50 mm Hg pressure group, the cytoplasm of some cells was red at 1 h, suggesting that cytochrome C release into the cytoplasm, the fluorescence intensity increased with the prolongation of the pressure time, and a wide range of red strong fluorescence appeared in the cytoplasm at 24 h under pressure. The expression of p53 in corneal endothelial cells of anti-Caspase-9 and anti-Caspase-8 pretreatment groups was 0.535 鹵0.007 and 0.703 鹵0.010, respectively, which was significantly lower than that of control group (0.727 鹵0.021) (P 0.01). The expression of Bcl-2 decreased in anti-Caspase-9 and anti-Caspase-8 pretreatment groups (0.312 鹵0.003 and 0.442 鹵0.011, respectively), which was significantly lower than that in control group (0.501 鹵0.011) (P 0.01). The expression of p53 and Bcl-2 in corneal endothelial cells of anti-Caspase-9 pretreatment group was lower than that of anti-Caspase-8 pretreatment group, and the difference was statistically significant (P 0.01). The results showed that anti-Caspase-9 could inhibit the apoptosis of corneal endothelial cells under high pressure. Conclusion Caspase-9 inhibitor can effectively block the apoptosis of corneal endothelial cells induced by high pressure. The injury of high pressure on corneal endothelial cells mainly triggers the release of mitochondrial cytochrome C. Activation of endogenous enzyme-linked reactive apoptosis pathway involved in Caspase-9.
【作者單位】: 南昌大學(xué)醫(yī)學(xué)院、江西新視界眼科醫(yī)院;中山眼科中心;南昌愛(ài)爾眼科醫(yī)院;南昌大學(xué)附屬眼科醫(yī)院;
【基金】:國(guó)家自然科學(xué)基金資助(編號(hào):30801263)~~
【分類(lèi)號(hào)】:R77
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