亲环蛋白A通过调控自噬促进ox-LDL诱导RAW264.7细胞的活化与凋亡
[Abstract]:Aim to investigate whether cyclin A can promote the activation and apoptosis of RAW264.7 mononuclear macrophages by regulating autophagy level and promoting oxidized low density lipoprotein (oxidized low density lipoprotein,ox-LDL). Methods the expression of cyclin A, 尾-actin,LC3,beclin-1,bcl-2,ABCA1 and CD36 in murine macrophages cultured in vitro was detected by Western blot (Western blot). ELISA method was used to detect the protein content of cyclophile protein A in the supernatant of cell culture, small interference RNA was used to silence the expression of cyclin A and western blot was used to detect the silencing effect, and electron microscope was used to observe the formation of autophagy. The intensity of autophagy was observed by GFP-RFP-LC3 virus infection, the lipid deposition was observed by oil red staining, and the positive rates of CD80,CD86 and MHCII on cell surface were detected by flow cytometry (Flow Cytometry,FCM). Apoptosis rate was detected by Tunel assay. Results (1) after ox-LDL (100mg/L) stimulation for 24 h, the level of cyclin A protein in RAW264.7 cells increased significantly and reached its peak at 6 h (p0.05). The level of cyclin A protein in the supernatant of cell culture increased with time gradient (p0.05). (2) within 24 hours. After transfection of small interfering RNA, the expression of cyclin A was silenced, and then stimulated by ox-LDL for 12 and 24 hours. The level of autophagy associated protein LC3II/I in the silencing group was significantly lower than that in the negative control group (p0.05). There was no significant difference in Beclin-1 level between the two groups. Electron microscope observation showed that the intracellular autophagy in the cyclin A silencing group was significantly lower than that in the negative control group (p0.05). (3) after preinfection with GFP-RFP-LC3 adenovirus, and then treated with ox-LDL for 24 h. The number of GFP-RFP spots (autophagy lysosomes) in the cells of the cyclophile A silencing group was significantly higher than that of the negative control group (p0.05). (4) ox-LDL for 24 h, and the ABCA1 protein level in the cyclin A silencing group was significantly higher than that in the negative control group (p0.05). (4). The level of CD36 protein was significantly lower than that of negative control group (p0. 05). The intracellular lipid deposition in cyclophile A silencing group was significantly lower than that in the negative control group (p0.05). (5). The positive rates of CD80,CD86 and MHCII in the, Cy PA silencing group were significantly lower than those in the negative control group after 24 hours of ox-LDL intervention (p0.05). However, there was no significant difference in CD86 and MHCII between the two groups after pretreatment with autophagy inhibitor 3-MA for 1 h and then ox-LDL for 24 h (p0.05). (6) Ox-LDL intervention. The apoptosis rate of cyclin A silencing group was significantly lower than that of negative control group (p0.05), but there was no significant difference in apoptosis rate between the two groups after pretreatment with 3-MA for 1 hour and then with ox-LDL (p0.05). Conclusion (1) ox-LDL can stimulate the expression of cyclin A in RAW264.7 cells and secrete to the outside. (2) Cyclophile A can promote the autophagy of RAW264.7 cells induced by ox-LDL. Inhibition of autophagy. (3) Cyclophile A promoted lipid deposition in RAW264.7 cells after ox-LDL intervention. (4) Cyclophile A promoted the activation and apoptosis of RAW264.7 cells induced by ox-LDL by regulating autophagy.
【学位授予单位】:江苏大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:R54
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