磷酸甘油酸變位酶PGAM1參與DNA損傷應(yīng)答機制研究
[Abstract]:Abnormal energy metabolism is one of the most important characteristics of tumor cells, which mainly depends on aerobic glycolysis for energy metabolism. Aerobic glycolytic metabolic enzymes are the core elements regulating the pathway of aerobic glycolysis metabolism. The abnormal expression and activity of these enzymes are closely related to the degree of malignancy of various tumors and are the current research in the field of tumor metabolism. In fact, recent evidence suggests that metabolic enzymes may contribute to the maintenance of malignant microenvironment of tumor cells. It is of great significance to understand the role of metabolic enzymes in tumor genesis and development and their molecular mechanisms in revealing the role of tumor metabolism in the process of malignancy. It will also provide important theoretical basis for anti-tumor strategies targeting tumor metabolism. PGAM1 is an important metabolic enzyme in the aerobic glycolysis pathway. It participates in the aerobic glycolysis pathway by catalyzing the conversion of 3-phosphoglyceric acid (3-PG) to 2-phosphoglyceric acid (2-PG), and has high expression or activity in a variety of tumors. Recently, it has been reported that PGAM1 regulates pentose phosphate and serine biosynthesis pathway simultaneously through its enzyme activity. PGAM1 has become an important molecule in the field of tumor metabolism. However, the understanding of PGAM1 is still very limited, only in the aspects of energy supply and biosynthesis. The role of PGAM1 inhibitors in biological development provides experimental evidence and important information for guiding the use and development of PGAM1 inhibitors. First, we used mass spectrometry-based proteomics techniques to systematically study the possible signaling pathways that interfere with PGAM1 function. In this paper, we will explore the possible role of PGAM1 in DNA damage response. Firstly, to confirm the role of PGAM1 in DNA damage response, we examined the effects of PGAM1 interference on the sensitivity of different types of DNA damage drugs by clone formation and other experiments. It was found that PGAM1 could selectively enhance the cell sensitivity to CPT and CDDP, suggesting that PGAM1 might be closely related to the replication-dependent DNA double strand breaks (DSBs) response induced by CPT and CDDP. We found that interfering with PGAM1 did not affect the initial damage level of DSBs, but resulted in DNA repair deficiencies. Further, we revealed that PGAM1 specifically regulates HR repair, not NHEJ junction, through two major repair pathways, homologous recombination (HR) or non-homologous end-joining (NHEJ) reporter gene system. By comparing PGAM1 with wild-type or mutant PGAM1, we found that the DNA damage repair function of PGAM1 was enzyme-dependent. Meanwhile, PGMI-004A or methyl-2-PG, the enzyme activity inhibitor of PGAM1, were used to confirm the above results. The results showed that PGAM1 participated in HR repair mainly by affecting the pentose phosphate pathway. The end product of the pentose phosphate pathway, dNTP, could reverse the defect of HR repair induced by PGAM1 interference. In this study, we focused on several key steps in HR repair. Combining with immunofluorescence detection of repair protein foci formation, we found that interfering with PGAM1 affected CPT-induced single-stranded DNA (ssDNA) exposure at the end of DSBs, which hindered the recruitment of RPA complexes. In-depth study found that PGAM1 regulated intracellular dNTP levels, resulting in p53/p73-dependent p21 transcription activation, the latter by up-regulating the activity of E3 ubiquitin ligase APC/Cdh1, resulting in decreased stability of CtIP protein, protein level down-regulation. Based on the above mechanism, we explored the clinical strategy of PGAM1 inhibitor. Using subcutaneous transplantation tumor model in nude mice, we found that interfering with PGAM1 or combining with PGAM1 inhibitor could enhance the inhibitory effect of Olaparib on BRCA wild-type transplanted tumor, and interfering with PGAM1 or PGMI-004A significantly. To sum up, we have found that PGAM1 regulates the repair of HR by regulating the level of CtIP protein in tumor tissues, leading to the accumulation of DNA damage and inducing apoptosis. On this basis, this study confirmed that the combination of PGAM1 inhibitors can expand the therapeutic space of PARP inhibitors, and provide a new opportunity for PARP inhibitors to treat BRCA wild-type tumors.
【學(xué)位授予單位】:南京大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:R96
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