咪唑?qū)θ俗訉m內(nèi)膜腺上皮癌細胞(HEC-1B)自噬及凋亡的影響
[Abstract]:Imidazole is a weak alkaloid. It is an important group of histamine and histidine in organism. Imidazole and its derivatives are widely used in different types of drugs, showing different pharmacological activities, such as antibacterial, antifungal, anti-virus, anti-parasite, antagonistic histamine receptor and so on. Especially as an anticancer drug, imidazole has shown a broad application prospect. Many important achievements have been made in this field, and many imidazole compounds have been used as anticancer drugs in clinic. However, the anti-cancer mechanism of imidazole drugs is not completely clear. Autophagy and apoptosis are closely related to the occurrence of cancer. At present, the majority of chemotherapeutic drugs are mainly through inhibiting autophagy and promoting apoptosis to achieve the purpose of cancer treatment. In this study, the effects of imidazole on autophagy and apoptosis of human endometrial adenocarcinoma cell line (HEC-1B) were systematically studied in order to reveal the molecular mechanism of anti-cancer effect of imidazole drugs. In autophagy: (1) low concentration of imidazole (5-25mM) could induce vacuolation of HEC-1B cells within 6 hours. Western blotting assay showed that imidazole could significantly increase the content of LC3-II, a marker of autophagy. Furthermore, transmission electron microscopy (TEM) showed that imidazole induced a large number of autophagy-like vesicles (AVs), indicating that imidazole affected the autophagy process of cells. (2) Western blotting assay showed that imidazole did not significantly affect autophagy-priming-related kinases and molecules, indicating that imidazole-treated cells did not initiate autophagy. (3) in the cells treated with imidazole, EGFP-LC3 distributed in dot shape and the level of free EGFP protein decreased significantly. Further Western blotting analysis showed that the level of p62 protein was significantly increased by imidazole treatment. The inhibition of BafA1 did not increase the level of LC3-II in the cells treated with imidazole, which indicated that imidazole blocked the degradation of autophagy. (4) Laser confocal detection of subcellular localization of mRFP-GFP-LC3 showed that imidazole could increase the number of autophages, but no increase in the number of autophagy lysosomes was detected, indicating that imidazole inhibited autophagy maturation to autophagy lysosomes. In the aspect of apoptosis: (1) High concentration of imidazole (50-100mM) could significantly inhibit the survival of HEC-1B cells at 12 h., Western blotting assay showed that caspase9 and caspase3 breaks were induced by imidazole treatment, indicating that imidazole could induce apoptosis of HEC-1B cells. (2) RT-PCR and Western blotting were used to detect the expression of pro-apoptotic protein Bim. The results showed that the expression of Bim mRNA and protein was significantly increased by imidazole treatment. (3) the effect of imidazole on transcription factor Fox03a was detected by Western blotting and protein overexpression. The results showed that imidazole could induce the upregulation of FoxO3a protein and promote its entry into nucleus. (4) further studies showed that siRNA-mediated FoxO3a gene silencing significantly inhibited Bim upregulation induced by imidazole and reduced cell mortality, suggesting that imidazole up-regulated Bim expression by activating Fox03a. In conclusion, imidazole blocks autophagy degradation by inhibiting autophagy maturation; at the same time, imidazole induces apoptosis through FoxO3a-Bim pathway. The results of this study have clarified the molecular mechanism of imidazole on autophagy and apoptosis of HEC-1B cells and provided valuable scientific basis for further research and development of imidazolium anticancer drugs.
【學位授予單位】:中國農(nóng)業(yè)大學
【學位級別】:博士
【學位授予年份】:2014
【分類號】:R737.33
【共引文獻】
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