Leptin诱导人乳腺癌细胞PKM2上调及对EMT影响的实验研究
[Abstract]:Objective To investigate the effect and mechanism of leptin on the expression of M2-pyruvate kinase (PKM2) and epithelial-mesenchymal transition (EMT) in human breast cancer cells MCF-7, SK-BR-3. Methods 1. Western blotting (WB) and immunofluorescence (IF) were used to detect the expression of Leptin long receptor OB-Rb and short receptor OB-Rt in MCF-7, SK-BR-3 and MDA-MB-468 breast cancer cells. The morphological changes of three cells were observed by human Leptin treatment. The expression of EMT-related marker protein was detected by WB. After treatment of human breast cancer cells MCF-7, SK-BR-3, the changes of PKM2 m RNA and protein levels were analyzed by QRT-PCR and WB. 3. The effects of Leptin on the migration and invasion of breast cancer cells MCF-7, SK-BR-3 were detected by interfering with PKM2, scratch and Transwell invasion assays with chemically synthesized PKM2-si RNA, and WB was used to detect the effects of Leptin on the migration and invasion of the cells. Leptin combined with PI3K/AKT, JAK/STAT, MAPK/ERK1/2 signal pathway inhibitors were used to treat breast cancer cells MCF-7 and SK-BR-3. WB was used to detect the expression of PKM2. Leptin receptor neutralizing antibodies were used to treat breast cancer cells MCF-7 and SK-BR-3. WB was used to detect the expression of PKM2 and activation of PI3K/AKT signaling pathway. The expression of PKM2 and EMT-related proteins in breast cancer cells MCF-7 and SK-BR-3 after treatment with PI3K/AKT pathway inhibitors was detected by WB. 5. The SK-BR-3 cell line stably interfering with PKM2 was constructed. The nude mice transplanted tumor model was established by using this cell line, the tumor size was measured and the survival time was observed. Results WB and IF results showed that breast cancer cells MCF-7, SK-BR-3 and MDA-MB-468 all expressed OB-Rb and OB-Rt; Leptin could induce EMcadT-like changes in three cell lines, and down-regulate the epithelial marker E-cadherin and up-regulate the interstitial marker Vimenti Vimenti. QRT-PCR and WB results showed that Leptin could significantly up-regulate the expression of M RNA and protein of PKM2 in MCF-7, SK-BR-3 cells. 3. To further explore the role of PKM2 in the process of Leptin promoting EMT in breast cancer cells, PKM2-si RNA was used to interfere with the expression of PKM2 in cells. Scratch and Transwell experiments showed that MCF-7, SK-BR-3 cells migrated. WB assay showed that E-cadherin level increased, Vimentin and Fibronectin levels decreased, that is, Leptin-induced EMT was inhibited after interfering with PKM2 expression. 4. WB assay showed that inhibition of PI3K/AKT signaling pathway could attenuate Leptin-induced PKM2 expression. The activation of the pathway was inhibited and the effect of Leptin on PKM2 expression was inhibited. WB assay showed that the effect of Leptin on PKM2 expression and EMT in breast cancer cells was inhibited after PI3K/AKT signaling pathway was inhibited. 5. Nude mice breast cancer xenograft models were divided into SKBR-3, SKBR-3-LV and SKBR-3-sh PKM2 groups, SKBR-3-LV as control group, SKBR-3-sh PKM2 as control group. The results showed that the tumor volume and weight of SKBR-3-sh PKM2 group were significantly smaller than those of control group. The liver and lung metastases of SKBR-3, SKBR-3-LV group were significantly more than those of SKBR-3-sh PKM2 group. The survival time of R-3-sh PKM2 group mice was significantly prolonged. Conclusion 1. Leptin can promote the occurrence of EMT in breast cancer cells MCF-7, SK-BR-3, MDA-MB-468. Leptin can activate PI3K/AKT signaling pathway and up-regulate the expression of PKM2 in breast cancer cells MCF-7, SK-BR-3, thereby promoting the occurrence of EMT.3 in breast cancer cells. PKM2 may be an important target for breast cancer invasion and metastasis.
【学位授予单位】:重庆医科大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:R737.9
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