CD24分子在刀豆蛋白A誘導小鼠急性肝損傷中的作用及機制研究
[Abstract]:BACKGROUND & OBJECTIVE: Acute liver injury (acute liver injury) is a kind of global harmful disease which is more common in clinic and has a serious effect on human health. Acute liver injury can be caused by external toxic substances, pathogenic micro-organisms and drugs, and the disease is manifested as the occurrence of necrosis of the liver cells in a short time, the bleeding of the liver cells, the rapid increase of the serum glutamic acid/ grass transaminases and the cytokines, the accumulation of the multi-organ dysfunction, and the serious to the liver failure. The mechanism for acute liver injury is still unclear. An increasing number of evidence suggests that the liver is a special immune tolerance microenvironment due to its double blood supply. Studies have shown that the cause of liver injury is not a direct effect of external substances, but that the expression of an immune response to an antigen on the surface of an infected liver cell leads to a serious immune imbalance, In turn, a large number of inflammatory factors are produced that cause liver injury to occur until severe multiple organ dysfunction occurs. CD24 is a low-molecular-weight cell surface membrane protein that is expressed in a variety of cell surfaces in a human and a mouse and has a variety of different biological functions. The CD24 molecules were confirmed to regulate the self-reactive T cells and to inhibit the antigen-presenting and T-cell activation. The model of liver injury induced by bean protein A is a real model for simulating the in-vivo process of acute immune liver injury. However, the role of CD24 in acute liver injury induced by bean protein A has not been reported. The main contents of this thesis are as follows: 1. The difference of the degree of liver injury (including liver pathology, serum ALT level and the level of cytokine expression) in the model of acute liver injury induced by CCD24-deficient mice and the wild-type mice in the same fossa. II. The immune mechanism (including the subpopulation of the liver and the relevant cell signal pathway) of the differential was studied. Methods: The model of acute liver injury in mice was established by tail vein injection of the bean protein A, and the difference of the degree of acute liver injury (including liver pathology, serum ALT level and the level of cytokine expression) induced by CD24 deficient mice and the wild-type mice in the same fossa was compared. The expression level of CD4 + T and CD8 + T cell surface CD24 in the liver and spleen was detected. The maturation of T cells in the CD24-deficient mice and the control group was detected. It was confirmed that the CD24 deficient mice lead to a different cell source for acute liver injury (intracellular staining to determine CD4 +, CD8 + T, and NKT cells to release IFN-1). and the source of the immune cells of the difference of the acute liver injury is determined through the adoptive transfer experiment body. The T cells of the IFN-P difference were confirmed by the in vitro stimulation of the CD24 deficient mice and the control mouse T cells by the knife-bean protein A, the anti-CD3/ CD28 antibody, and the PMA/ Ionone in vitro. Western blot was used to analyze the difference of the signal pathways between the liver and the spleen T cells and to find relevant signal molecules in the mice of CD24 and control mice after the action of the knife-bean protein A. Results: (1) The expression of CD24 on T-cells was up-regulated after the stimulation of the knife-bean protein A; (2) in-vivo experiments, the degree of liver injury of the CD24-deficient mice was significantly lower than that of the wild-type mice; and (3) in vivo and in vitro experiments were confirmed. In the case of the liver injury caused by the bean protein A, the number of IFN-1 secreted by the CD4 + T cells of the CD24 deficiency was less; and (4) after the liver injury induced by the bean protein A, the phosphorylation of the STAT1 in the liver of the CD24 deficient mice was significantly reduced. Conclusion: We have confirmed the effect and mechanism of CD24-deficient mice in the protection of liver injury in the model of liver injury of the bean protein A by constructing a T cell-mediated liver injury model of the bean-bean protein A. It is confirmed that the CD24-deficient mice can reduce the liver injury and reduce the liver injury after the action of the CD4 + T-secreting IFN-1-mediated bean protein A by reducing the phosphorylation of the STAT1 in the liver cells, thereby providing a potential therapeutic target for the clinical treatment of the acute liver injury.
【學位授予單位】:中國人民解放軍醫(yī)學院
【學位級別】:博士
【學位授予年份】:2016
【分類號】:R575
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