內(nèi)質(zhì)網(wǎng)應(yīng)激對(duì)蛋白酶體抑制劑誘導(dǎo)乳腺癌MCF-7細(xì)胞自噬的作用
[Abstract]:Objective: Breast cancer is a common malignant tumor, which not only has the characteristics of high recurrence rate, high metastasis rate and high mortality, but also has an increasing incidence year by year. Later radiotherapy, chemotherapy and targeted therapy are still indispensable parts of the comprehensive treatment of breast cancer, so exploring the mechanism of breast cancer cell tolerance to chemotherapy and developing new chemotherapeutic drugs have always been an important part of breast cancer research. Autophagy is a lysosome-mediated process of protein and organelle degradation in cells. Under normal conditions, autophagy is limited to the basic level, but in starvation and in and out of cells. Autophagy is activated under the stimulation of environmental changes. Although studies suggest that autophagy is closely related to endoplasmic reticulum stress, previous studies have been limited and have not yet studied the mechanism of autophagy. Inhibition of autophagy-related upstream endoplasmic reticulum stress signaling pathway enhances the cytotoxicity of proteasome inhibition on breast cancer MCF-7 cells. The preparation MG-132, autophagy inhibitor 3-MA and endoplasmic reticulum stress inhibitor Salubrinal were used as the experimental drugs. The experiment was divided into blank control group, MG-132 group, MG-132+3-MA group and MG-132+Salubrinal group. The effect of each group on the activity of MCF-7 cells was detected by MTT method, and the expression of autophagy-related protein LC3 was detected by Western blot. The levels of Bcl-2, Bax and Caspase-3, and the levels of endoplasmic reticulum stress-related proteins Grp-78, GADD153 and Caspase-12 were detected. The apoptosis of MCF-7 cells was detected by flow cytometry. The endoplasmic reticulum stress-related genes Grp-78, GAD153 and Caspase-12 were compared by RT-PCR. Results: 1MG-132 inhibited the activity of MCF-7 cells in a concentration-dependent manner with the increase of concentration and prolongation of action time. Sexual and time-dependent, the inhibitory effect of MG-132 concentration was less than that of 2.5 micromol/L, the inhibitory rate was 17.4%. When the concentration of MG-132 was 10 micromol/L and 40 micromol/L for 48 hours, the inhibitory rate reached 48.6% and 96.3%, respectively. The IC20 value of MG-132 at 48 hours was calculated by SPSS17.0 software. The inhibitory rate was 6.1% at 1 mmol/L for 48 hours, 46.2% at 10 mmol/L and 92.4% at 20 mmol/L for 48 hours, respectively. The IC5 value of 3-MA at 48 hours was about 1 mmol/L. Salubrina at low concentration was found to be a concentration-dependent inhibitory effect. When the concentration of Salubrinal was 40 micromol/L and 80 micromol/L for 48 hours, the inhibitory rates were 4.3% and 11.5%, respectively. When the concentration of Salubrinal was 40 micromol/L and 80 micromol/L for 48 hours, the inhibitory rates were 37.9% and 84.8%, respectively. It was found that the IC5 value of Salubrinal at 48 hours was about 5 micron. The results of chymotrypsin-like activity of ol/L.2 proteasome showed that MG-132 could inhibit the activity of proteasome in MCF-7 cells. The activity of proteasome in MCF-7 cells was inhibited by MG-132 at 3 h, the inhibition rate was 65%. The inhibition rate was the strongest at 48 h, which was time-dependent. The inhibition rate of proteasome activity was about 65% at 3 h, suggesting that the inhibition of proteasome activity first appeared, and then the inhibition of cell proliferation. 3-MA (1 mmol/L) enhanced the inhibition of MG-132 (2.5 micromol/L) on cell proliferation, and the inhibition increased with the prolongation of time. Salubrinal (5 micromol/L) enhanced the inhibitory effect of MG-132 on MCF-7 cells in a time-dependent manner. After 48 hours, the inhibitory effect was the most obvious. Compared with 3-MA, the inhibitory effect of Salubrinal (5 micromol/L) on the proliferation of MCF-7 cells was relatively weak, and the difference was the most obvious at 48 hours. 4MG-132 (2.5 micromol/L) could induce MCF-7 cells. 3-MA (1 mmol/L) and Sabrina (5 umol/L) enhanced MG-132-induced apoptosis and G2-phase cell arrest, the apoptosis rate increased to 23.3% and 24.7%, the percentage of G2-phase cells increased to 24.80% and 25.76%. 5 MG-132 (2.5 umol/L) induced autophagy and autophagy inhibition of MCF-7 cells. Preparation 3-MA (1mmol/L) significantly inhibited autophagy and inhibited the transformation of LC3-I to LC3-II. Salubrinal (5umol/L), an endoplasmic reticulum stress inhibitor, decreased the expression of LC3-I and inhibited the transformation of LC3-I to LC3-II, showing autophagy inhibition, but the effect was weaker than that of 3-MA.6, compared with MG-132 (2.5umol/L), and decreased the expression of 3-MA (1mmol/L) and Salubrinal (5umol/L). Anti-apoptotic protein Bcl-2, pro-apoptotic protein Bax and Caspase-3 were up-regulated, indicating a good enhancement of MG-132-induced apoptosis in MCF-7 cells. 7MG-132 (2.5 micromol/L) could induce endoplasmic reticulum stress in MCF-7 cells. Salubrinal (5 micromol/L), an endoplasmic reticulum stress inhibitor, could effectively inhibit this process at protein and m RNA levels. Similarly, 3-MA (1mmol/L) also showed a good inhibitory effect on endoplasmic reticulum stress, and had a significant inhibitory effect on the expression of protein and m RNA, but the effect was weaker than that of Salubrinal. Plasma reticulum stress signaling pathway can enhance the killing effect of proteasome inhibitor MG-132 on breast cancer MCF-7 cells.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:R737.9
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