抑制自噬在視網(wǎng)膜光感受器細胞光損傷中的保護作用
[Abstract]:Autophagy is a conservative process of self degradation and often protects cells at critical stages of cell growth, such as developmental or nutritional deficiency. However, autophagy sometimes participates in the process of apoptosis. Photoreceptor cells are the only neuron cells that directly expose light stimulation to visual signals under light. Too strong light irradiation still has cytotoxic effects on the retina. Up to now, the exact mechanism of retinal light damage is not clear, and there is still no effective treatment in clinic, especially the mechanism of autophagy in photoreceptor cell apoptosis.
The effect of 1. light on the induction of autophagy in 661W cells
Objective: To observe the effect of 2600Lux visible light irradiation on autophagy of 661W cells by different autophagy methods. Methods: (1) 661W cell lines were treated by 2600Lux visible light treatment, and the photoreceptor cell light damage model was established. (2) the expression of autophagic marker protein LC3 in cell was detected by WeStesrn blotting. 3-MA and LY294002 were used to observe the morphological changes of autophago. (3) after pre treatment of 661W cells with two different autophagic inhibitors, the percentage of cell death was evaluated by PI staining, and the effect of autophagy on the protection of light damage of 661W cells was observed. Results: (1) in light intensity 26 The expression level of LC3II in 661W cells irradiated by 001ux was obviously enhanced. The proportion of LC3II/LC3I in the experimental group was significantly higher than that of the control group. The difference was statistically significant (P0.001). After 2 days of illumination, the 661W cells showed typical autophagy, and some intracellular substances such as the organelles were wrapped around the double layer membrane and became autophagic bodies. (2) the cells were pretreated with 10-30 M LY294002 light before 30 minutes, the proportion of cell death decreased from 63% to 20%, and the optimum concentration was around 20 M; 661W cells incubated with 2.5-7.5mM 3-MA and the cell mortality decreased from 63% to 30%. The difference was statistically significant (P0.001). Conclusion: light (P0.001). Conclusion: light (P0.001). Irradiation is the key to induce autophagy in 661W cells, and blocking autophagy can effectively protect photoreceptors from damage.
Effect of 2. MAPK signaling pathway on autophagy of 661W cells induced by light
Objective: To investigate the effect of MAPK signal pathway on the activity of 661W cells under 2600Lux visible light, and to explore the mechanism of autophagy in photoreceptor cell apoptosis. Methods: (1) using 2600Lux visible light to treat 661W cell lines after subculture, and to establish light damage model of photoreceptor cells. (2) Western blotting detection ERK/ phosphorylated ERK, JNK/ phosphorylated JNK, p38/ phosphorylated p38 expression level. The percentage of cell death of ERK inhibitor PD980519, JNK inhibitor SP600125 and P38 inhibitor pretreatment were evaluated by PI staining. (3) cell lysis was collected at a specified time, and the cells were detected and phosphorylated. The changes in the expression level of LC3II and LC3I after RK, as well as the formation of lysosomes in the small body of autophagy by LysoTracker staining. Results: (1) collect cell lysis, analyze the expression level of ERK/ phosphorylated ERK, JNK/ phosphorylated JNK, p38/ phosphorylated p38, and the test group (phosphorylation group) scanning protein strip light density measurement The strength of the control group (non phosphorylation) was only slightly increased, and the difference was statistically significant (P0.001). The proportion of light induced cell death was reduced from 61% to about 30% with 40-80 M PD980519, while the protective effect of SP600125 or SB203580 on cell protection from light damage was not significant, the difference was statistically significant (P0.001) (2) through Western blot detection, it was found that the up regulation of P-ERK and ERK was reversed with 40 mu PD980519 before light irradiation for 30 minutes. The quantitative analysis showed that the ERK level in the form of non phosphorylation and phosphorylation in the PD980519 preconditioning group decreased significantly. And the up regulation of LC3II/LC3I ratio was reduced by the 40 u PD980519 treatment group after 2 days of light. It was found by Lyso Tracker staining that the formation of lysosomes in cells was obviously inhibited even under light. The difference was statistically significant (P0.001). Conclusion: light irradiation can activate the activation protease (MAPK) pathway to cause 661W cells to occur autophagy, and in the downstream pathway of the activated MAPK signal, it is ERK pass. Roads, not JNK or P-38, play a key role in the mechanism of light induced cell death. By blocking the ERK pathway, autophagy can be effectively inhibited by light induced 661W cells.
The findings of this study may have potential application in the treatment of retinal photodamage.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:R774
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