肥胖脂肪組織分泌miR-27a通過靶向FOXO1促進(jìn)肝癌的發(fā)生發(fā)展
[Abstract]:Background:
A large number of epidemiological studies have shown that obesity is closely related to the occurrence and development of various cancers. Obesity usually leads to liver diseases, such as non-alcoholic fatty liver disease (NAFLD) and more severe non-alcoholic fatty hepatitis (NASH), which in turn leads to fatty inflammation in the liver and liver fibrosis, leading to cirrhosis of the liver. It has been reported that both diet and hereditary obesity are strong factors inducing hepatocarcinogenesis in obese mice. A large number of studies have shown that obesity may promote hepatic inflammation by inducing the production of tumor-promoting cytokines IL-6 and TNF, and by activating carcinogenic bases. MicroRNA (microRNA) is a newly discovered non-coding single-stranded small molecule RNA, which regulates the expression of multiple genes at the post-transcriptional level. It is a key component of gene regulatory network. It is involved in regulating cell metabolism, proliferation, apoptosis, differentiation and development. Abnormal expression of microRNA can lead to cancer. Several studies have shown that microRNAs play an important role in the development of hepatocellular carcinoma and are directly involved in the differentiation, apoptosis, invasion and distant metastasis of hepatocellular carcinoma. 7A plays an oncogene role in the occurrence and development of breast cancer, lung cancer, pancreatic cancer and other malignant tumors, but the role and mechanism of microarray-27a in obesity-induced liver cancer is still unclear. The diagnosis and treatment of fat liver cancer provide a new target.
Objective:
Objective To explore the mechanism of adipose tissue secreted microarray-27a in promoting the occurrence of primary hepatocellular carcinoma (PHC) and mediating the occurrence of obesity-related malignant tumors, and to provide new ideas for tumor growth and intervention of tumor formation and progression.
Firstly, the expression of microRNA-27a in the serum of obese and non-obese primary hepatocellular carcinoma, healthy control group, and obese primary hepatocellular carcinoma, non-obese primary hepatocellular carcinoma tissues, adjacent liver tissues and omentum tissues were detected by Real-time PCR. Immunohistochemical staining was used. Methods The expression of FOXO1, P21, P27 and CyclinD1 in clinical tissue samples was determined. The 3T3-L1 adipocytes overexpressing microarray-27a were constructed and co-cultured with hepatoma cell line HepG2. The proliferation activity and cell cycle of hepatoma cells were detected. The mRNA and eggs of FOXO1, P21, P27, CyclinD1 were detected by RT-PCR and Western blot. White expression.
Result:
The levels of microRNA-27a in tumor tissues of all patients with primary hepatocellular carcinoma were significantly higher than those of adjacent tissues; the levels of microRNA-27a in tumor tissues of obese patients with hepatocellular carcinoma were twice as high as those of non-obese patients with hepatocellular carcinoma, suggesting that the up-regulation of microRNA-27a might serve as a biomarker for biological diagnosis of obesity-related hepatocellular carcinoma; compared with non-obese patients with non-obe The levels of serum microRNA-27a in obese hepatocellular carcinoma patients were significantly higher than those in non-obese hepatocellular carcinoma patients and healthy controls. The levels of FOXO1, P21 and P27 in liver cancer tissues with high expression of microRNA-27a were significantly lower than those in non-obese hepatocellular carcinoma patients and healthy controls. The levels of CyclinD1 were significantly higher in hepatocellular carcinoma tissues with low expression of microRNA-27a. The expression levels of FOXO1, P21 and P27 were significantly increased, while the expression level of Cyclin D1 was significantly decreased. 3T3-L1 adipocytes could decrease the mRNA and protein expression of FOXO1, P21 and P27, and increase the mRNA and protein expression of Cyclin D1, thereby promoting G1/S transition of cell cycle and inducing the proliferation of HepG2.
Conclusion:
Mi-27a secreted by adipose tissue can promote the cell cycle transition in G1/S phase and ultimately promote the proliferation of hepatocellular carcinoma cells by down-regulating the transcription factor FOXO1, decreasing the expression of cyclin-inhibitory proteins P21 and P27, and increasing the expression of cyclin-regulated proteins Cyclin D1.
【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】:2015
【分類號(hào)】:R735.7
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