背景:国内外研究表明,自噬与激素性股骨头缺血坏死之间具有一定的相关性,控制PI3K/Akt/mT OR信号通路可能调控自噬,对该病具有一定的治疗作用。目的:通过介绍PI3K/Akt/mTOR信号通路对自噬的调控以及自噬与激素性股骨头缺血坏死的关系,...背景:国内外研究表明,自噬与激素性股骨头缺血坏死之间具有一定的相关性,控制PI3K/Akt/mT OR信号通路可能调控自噬,对该病具有一定的治疗作用。目的:通过介绍PI3K/Akt/mTOR信号通路对自噬的调控以及自噬与激素性股骨头缺血坏死的关系,总结并讨论自噬在激素性股骨头缺血坏死中的最新研究进展。方法:检索PubMed数据库、Web of science数据库、万方数据库中2008至2018年相关文献,检索词分别为"Steroid,necrosis of the femoral head,autophagy,signal pathway,糖皮质激素,股骨头坏死,自噬"。排除较陈旧及重复的文献,通过整理,共纳入83篇文献进行分析探讨。结果与结论:(1)PI3K/Akt/mTOR信号通路为抑制性通路,可以负向调控自噬,激活该通路可以抑制自噬,相反,抑制该通路可以诱导自噬;(2)激素诱导细胞发生凋亡和自噬与其剂量有关,较低剂量的激素可以激活自噬,而较高剂量的激素会导致细胞凋亡;(3)自噬对于激素性股骨头缺血坏死是双向作用,正面作用是自噬有助于改善激素性股骨头缺血坏死,负面作用是自噬诱导了激素性股骨头缺血坏死并加速其恶化。展开更多
AIM: To investigate the anti-tumor effects of nuclear factor-κB (NF-κB) inhibitor SN50 and related mechanisms of SGC7901 human gastric carcinoma cells. METHODS: MTT assay was used to determine the cytotoxic effects ...AIM: To investigate the anti-tumor effects of nuclear factor-κB (NF-κB) inhibitor SN50 and related mechanisms of SGC7901 human gastric carcinoma cells. METHODS: MTT assay was used to determine the cytotoxic effects of SN50 in gastric cancer cell line SGC7901. Hoechst 33258 staining was used to detect apoptosis morphological changes after SN50 treatment. Activation of autophagy was monitored with monodansylcadaverine (MDC) staining after SN50 treatment.Immunofluorescence staining was used to detect the expression of light chain 3 (LC3). Mitochondrial membrane potential was measured using the fluorescent probe JC-1. Western blotting analysis were used to determine the expression of proteins involved in apoptosis and autophagy including p53, p53 upregulated modulator of apoptosis (PUMA), damage-regulated autophagy modulator (DRAM), LC3 and Beclin 1. We detected the effects of p53-mediated autophagy activation on the apoptosis of SGC7901 cells with the p53 inhibitor pifithrin-α. RESULTS: The viability of SGC7901 cells was inhibited after SN50 treatment. Inductions in the expression of apoptotic protein p53 and PUMA as well as autophagic protein DRAM, LC3 and Beclin 1 were detected with Western blotting analysis. SN50-treated cells exhibited punctuate microtubule-associated protein 1 LC3 in immunoreactivity and MDC-labeled vesicles increased after treatment of SN50 by MDC staining. Collapse of mitochondrial membrane potential Δψ were detected for 6 to 24 h after SN50 treatment. SN50-induced increases in PUMA, DRAM, LC3 and Beclin 1 and cell death were blocked by the p53 specific inhibitor pifithrin-α. CONCLUSION: The anti-tumor activity of NF-κB inhibitors is associated with p53-mediated activation of autophagy.展开更多
文摘背景:国内外研究表明,自噬与激素性股骨头缺血坏死之间具有一定的相关性,控制PI3K/Akt/mT OR信号通路可能调控自噬,对该病具有一定的治疗作用。目的:通过介绍PI3K/Akt/mTOR信号通路对自噬的调控以及自噬与激素性股骨头缺血坏死的关系,总结并讨论自噬在激素性股骨头缺血坏死中的最新研究进展。方法:检索PubMed数据库、Web of science数据库、万方数据库中2008至2018年相关文献,检索词分别为"Steroid,necrosis of the femoral head,autophagy,signal pathway,糖皮质激素,股骨头坏死,自噬"。排除较陈旧及重复的文献,通过整理,共纳入83篇文献进行分析探讨。结果与结论:(1)PI3K/Akt/mTOR信号通路为抑制性通路,可以负向调控自噬,激活该通路可以抑制自噬,相反,抑制该通路可以诱导自噬;(2)激素诱导细胞发生凋亡和自噬与其剂量有关,较低剂量的激素可以激活自噬,而较高剂量的激素会导致细胞凋亡;(3)自噬对于激素性股骨头缺血坏死是双向作用,正面作用是自噬有助于改善激素性股骨头缺血坏死,负面作用是自噬诱导了激素性股骨头缺血坏死并加速其恶化。
基金Supported by Health Foundation of Jiangsu Province (H20 0719)the Higher Education Foundation of Jiangsu Province (08KJB320014)+2 种基金the Natural Science Foundation of Jiangsu Province (BK2008168)Suzhou High-Level Talents Project (2008-11)the Science, Education and Health Foundation of Soochow City (SWKQ00814)
文摘AIM: To investigate the anti-tumor effects of nuclear factor-κB (NF-κB) inhibitor SN50 and related mechanisms of SGC7901 human gastric carcinoma cells. METHODS: MTT assay was used to determine the cytotoxic effects of SN50 in gastric cancer cell line SGC7901. Hoechst 33258 staining was used to detect apoptosis morphological changes after SN50 treatment. Activation of autophagy was monitored with monodansylcadaverine (MDC) staining after SN50 treatment.Immunofluorescence staining was used to detect the expression of light chain 3 (LC3). Mitochondrial membrane potential was measured using the fluorescent probe JC-1. Western blotting analysis were used to determine the expression of proteins involved in apoptosis and autophagy including p53, p53 upregulated modulator of apoptosis (PUMA), damage-regulated autophagy modulator (DRAM), LC3 and Beclin 1. We detected the effects of p53-mediated autophagy activation on the apoptosis of SGC7901 cells with the p53 inhibitor pifithrin-α. RESULTS: The viability of SGC7901 cells was inhibited after SN50 treatment. Inductions in the expression of apoptotic protein p53 and PUMA as well as autophagic protein DRAM, LC3 and Beclin 1 were detected with Western blotting analysis. SN50-treated cells exhibited punctuate microtubule-associated protein 1 LC3 in immunoreactivity and MDC-labeled vesicles increased after treatment of SN50 by MDC staining. Collapse of mitochondrial membrane potential Δψ were detected for 6 to 24 h after SN50 treatment. SN50-induced increases in PUMA, DRAM, LC3 and Beclin 1 and cell death were blocked by the p53 specific inhibitor pifithrin-α. CONCLUSION: The anti-tumor activity of NF-κB inhibitors is associated with p53-mediated activation of autophagy.
