Ⅰ型干擾素激活PFKFB3驅(qū)動的糖酵解促進巨噬細胞的抗病毒先天免疫
[Abstract]:Innate immune system provides important protection against virus infection. By pattern recognition of viral nucleic acids, the body activates the innate immune response to produce a large number of interferon-1 types. The latter plays an important role in anti-viral immunity. However, it is still unclear whether interferon I may act as a mechanism for virus resistance by regulating cell metabolism. As the center of cell energy metabolism, glucose metabolism is considered to be involved in various aspects of cell life in recent years. Anaerobic catabolism of glucose, also known as glycolysis, is the first step in glucose metabolism. It not only provides energy for cell life activities rapidly, but also produces intermediates to participate in the synthesis of various biomolecules. To provide material basis for cell proliferation. There is growing evidence that glycolysis is precisely regulated in the life of different cells. Therefore, our research focuses on the relationship and interaction between glucose metabolism and antiviral innate immunity in different types of cells. Our study found a new metabolic association of innate immunity against viruses. Type I interferon (IFN) produced by viral infection selectively upregulated glycolysis in macrophages rather than mouse embryonic fibroblasts. This phenomenon is due to the specific up-regulation of fructose-2-kinase / fructose-2-diphosphatase (PFKFB3) gene expression in macrophages. The results of functional acquisition and functional deletion showed that PFKFB3 was the key enzyme in the control of glycolysis flow. Interestingly, macrophages from heterozygous mice derived from PFKFB3 mutations, rather than embryonic fibroblasts, showed susceptibility to viral infection. The results of the latter study showed that although glycolysis contributed to the biosynthesis process and the moderate decrease in the protein level of PFKFB3 in host cells did not affect the virus-related synthesis. Further studies have demonstrated that PFKFB3-driven glycolysis promotes the antiviral function of macrophages by enhancing their phagocytosis. Indeed, our results suggest that IFN-induced glycolysis enhances the phagocytosis of macrophages so that virus-infected cells are more effectively phagocytized and eliminated. During phagocytosis, PFKFB3 is immediately recruited to the newly formed actin microfilaments around the phagocytic vesicles, which may provide energy for rapid actin polymerization. In addition, since the activity regulation of phosphatidylinositol 3-kinase (PI3K) signaling pathway is necessary for the completion of phagocytosis, we found that the level of PFKFB3 expression was positively correlated with the activity of PI3K signaling pathway. Therefore, the regulation of PI3K signaling pathway by PFKFB3 may also be the mechanism of PFKFB3 promoting phagocytosis of macrophages. In conclusion, our results suggest that macrophage specific metabolic regulation contributes to anti-viral innate immunity. This study helps us to better understand the relationship between cellular metabolism and innate immunity. The mutual regulation mechanism between the two provides a potential target for the development of antiviral innate immunopharmaceuticals.
【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】:2016
【分類號】:R392
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