PI3K抑制劑LY294002對(duì)人晶狀體上皮細(xì)胞增殖的影響
[Abstract]:Preface
Posterior capsular cataract is the most common complication after modern cataract surgery, which can cause the lower visual acuity, also called posterior capsular opacification (PCO). The residual lens epithelial cells (lens epithelial cells, LECs) after cataract surgery proliferate, migrate, fibrotic and accompany the secretion of extracellular matrix. It is the main reason for the formation of PCO, and the proliferation of lens epithelial cells is the most important. For many years, domestic and foreign scholars have been working on the study of inhibiting the proliferation of lens epithelial cells through drugs and other methods.
At present, signal transduction pathway is a hot spot in the research field of cell proliferation. PI3K/AKT (phosphati-dylinositol-3 kinase/AKT, phosphatidylinositol -3 kinase / protein kinase B) signaling pathway plays an important role in regulating cell growth, survival, proliferation and apoptosis, [3], and LY294002 as a specific inhibitor of this signal pathway can be inhibited. The proliferation of.S phase kinase related protein 2 (S phase kinase associated protein2, Skp2), as a target regulator in the downstream of the pathway, can mediate cell cycle factor degradation and regulate cell proliferation. This study applied PI3K inhibitor LY294002 to treat the cultured human crystalline epithelial cell lines in vitro, SRA01 / 04, to observe the proliferation of cells. The influence and research of possible mechanisms will provide a new theoretical basis for the prevention and treatment of posterior capsule opacification.
Materials and methods
First, material
Human lens epithelial cell line SRA01 / 04 was provided by the Institute of cancer research, Chinese Academy of Sciences, Beijing.
Two, method
1, cell culture, human lens epithelial cell line SRA01 / 04 was cultured in RPMI1640 culture medium containing 10% fetal bovine serum, and placed at 37, 5%CO2, saturated humidity cell culture box.
2, the cells were grouped, the experimental group was added with 25 mol / L P13K inhibitor LY294002, and the control group was added equal volume DMSO..
3, the effect of PI3K inhibitor LY294002 on the proliferation of human lens epithelial cells was detected by MTT colorimetric assay, and the growth curve was plotted and the optimal time of LY294002 was screened.
4, flow cytometry (FCM) was used to detect the effect of PI3K inhibitor LY294002 on the cell cycle of human lens epithelial cells.
5, Western-blot method was used to detect the effect of PI3K inhibitor LY294002 on the expression of Skp2 protein in human lens epithelial cells.
6, real-time RT-PCR assay was used to detect the effect of PI3K inhibitor LY294002 on Skp2mRNA expression in human lens epithelial cells.
Three, statistical analysis
The experimental data were analyzed by SPSS 11.5 statistical software. The data of each group were expressed as x + s, and t analysis was used for statistical analysis. P0.05 showed that the difference was statistically significant.
Result
1, PI3K inhibitor LY294002 inhibits proliferation of human lens epithelial cells.
The MTT method showed that the absorbance (A) value of the experimental group was lower than that of the control group. The difference was statistically significant (P0.05), the growth rate of.HLEC was significantly slowed, and the growth inhibition rate of 12,24,36 h cells was 19.6%, 33.8% and 24.2%., respectively.
2, PI3K inhibitor LY294002 blocks human lens epithelial cell cycle in the G1 / S phase.
FCM detection showed that the number of cells in G1 phase (66.15+2.63) in the experimental group was more than that of the control group (56.73+1.35)%, and the difference was statistically significant (P0.05), while the number of S phase (27.34+6.58)% in the experimental group was significantly lower than that in the control group (37.32+5.54)%, and the difference was statistically significant (P0.05).
3, PI3K inhibitor LY294002 inhibits the expression of Skp2 protein in human lens epithelial cells.
Western blot assay showed that the expression of Skp2 protein in the experimental group was significantly decreased compared with that in the control group, and the difference was statistically significant (P0.05).
4, PI3K inhibitor LY294002 inhibits the expression of Skp2 mRNA in human lens epithelial cells.
Real time RT-PCR assay showed that the expression of Skp2 mRNA in experimental group decreased, and the difference was statistically significant compared with the control group (P0.05).
conclusion
1, PI3K inhibitor LY294002 inhibits the proliferation of human lens epithelial cell line SRA01 / 04.
2, LY294002 inhibited the expression of Skp2 in cells and blocked some cells in the G1 / S phase.
【學(xué)位授予單位】:中國(guó)醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2010
【分類號(hào)】:R776.1
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