LAPF和CD11b負向調(diào)控天然免疫應(yīng)答及其機制研究
[Abstract]:The natural immune response is the first line of defense for the organism to resist the invasion of pathogenic microbes. However, the excessive activation of natural immune response can lead to the injury of the tissues and organs, which can lead to the production of autoimmune diseases and even cause the death of the patients. Therefore, the natural immune response should be activated in time to effectively remove the invading pathogens. The degree and duration of answer should also be controlled in a moderate range to maintain the balance of the body. It can be seen that the negative regulation of natural immune response is crucial to the maintenance of immune self stability. In recent years, the discovery and study of cells and molecules that can negatively regulate natural immunity gradually become the forefront of the field of natural immune research. Around the role of two negative regulators and related mechanisms, two parts of the negative regulation of natural immune response and its mechanism are carried out, including "LAPF inhibition of TLR triggering macrophages to produce TNF- alpha and its mechanism research" and "CD11b-Src signaling pathway to promote the production and mechanism of M2 macrophages", with a view to through our research To deepen the understanding and understanding of natural immune regulation and immune self stability. Part 1 LAPF inhibits TLR triggering macrophages to produce TNF-a and its mechanism, which includes PH and FYVE domain lysosome related apoptosis induced protein LAPF (also called PLEKHF1) which is by random large-scale sequencing from human dendritic cell cDNA library. A new lysosome related protein is now reported to be involved in the apoptosis of tumor cells induced by TNF-a in 2005. However, the function of LAPF in natural immunity has not been studied. In this subject, we prepared the LAPF deficient mice (lapfloxp/loxplyz2Cre/+), and found that the LAPF condition deficient mice were compared to the heterozygote control mice. The secretion of inflammatory cytokines increased in the endotoxin shock model, in which TNF- alpha was increased significantly, while the mRNA level of TNF- a in the lungs and spleen also increased significantly, suggesting that LAPF may negatively regulate the natural immune response and inflammation. Through in vitro cell experiments, it was found that the LAPF deficient macrophages secreted the increase of TNF- alpha under the TLR ligand stimulation. And TAK-, the activation level of phosphorylation of IKKa/ beta and p65 significantly increased, indicating that LAPF could inhibit the activation of NF- kappa B signaling pathway. Using Ip- mass spectrometry analysis and in vitro IP validation, we found that LAPF can be combined with TIRAP and MyD88 with TLR signal key transporter protein, which can further study the regulation of inflammatory cells and affect inflammatory cells. Factor release lays the foundation. Second CDllb-Src signaling pathway promotes the production and mechanism of M2 type macrophages. The regulation of integrin signal for natural immune response has been a hot issue in the frontier of natural immunity. Integrin has a very important role in the differentiation, development, migration, adhesion and activation of natural immune cells. CDllb is the a chain of integrin Mac-1, and CDllb antibodies are often used to screen out macrophages or other myeloid mononuclear phagocytes. Macrophages can be divided into M1 type (classic activated) macrophages and M2 type macrophages based on the phenotype and function of the macrophages, which release proinflammatory cytokines, respectively. The balance between M1 and M2 macrophages is essential for the regulation and self stability of natural immunity. In our laboratory, we have found that CDllb can degrade MyD88 and TRIF through Src-Syk ubiquitination, thus inhibiting the production of TNF-a in natural immune processes. However, CD11b-Src is in the phenotype and function of M1 and M2 in macrophages. The effect was not clear and worthy of further study. In the model of in vitro induced enteritis, we found that the CD1lb deficient mice and the mice treated with the Src inhibitor Dasatinib intraperitoneally were more severe in the colon, and the production of TNF-a in the mice was increased but the production of IL-10 decreased, and the expression of iNOS was enhanced but the expression of Arg-1 was enhanced. Weakened.TNF-a and iNOS are marker molecules of M1 type macrophages, IL-10 and Arg1 are marker molecules of M2 macrophages. This phenomenon suggests that CD11b-Src signals may induce macrophages to tend to M2 type macrophages. To this end, we directly detected the macrophages in the colon of mice that were treated with Dasatinib and induced enteritis. The proportion of M1 type macrophages increased and the proportion of M2 type macrophages decreased. Then we carried out CD11b-Src to make macrophages more inclined to M2 macrophage related mechanisms, and found that CD11b-Src in bone marrow derived macrophages can inhibit the expression of the M1 type macrophage marker molecule iNOS, which is induced by IFN- gamma, and CD11b-Src also can be used. Promote the expression of IL-4 induced M2 macrophage markers Arg-1 and YM-1; 2) CDllb promotes TLR induced STAT6 activation and IL-10 release by promoting the activation of Src-Akt signaling pathway. Further mechanism studies found that Src enhances Akt and activation of IL-4 signaling pathways, both of which are reported to promote macrophages. The expression of phenotypic molecules. However, only overexpression of STAT6 can reverse the downregulation of Src inhibitors to Argl, suggesting the important role of STAT6 in this process,.Src can interact with STAT6 to form a complex, and further hints that Src can participate in activated STAT6. in the TLR signal stimulation, Src by promoting P13K to regulate the ubiquitin of subunit p85. Degradation, promoting activation of PI3K-Akt signaling pathway, and further promoting the activation of AP-1 through negative regulation of GSK, eventually promotes the production of IL-10. In conclusion, CD11b-Src makes macrophages more likely to be M2 type macrophages by promoting STAT6 and Akt activation. Thus, CD11b-Src has an important role in natural immune negative regulation and control of inflammation. Studying the mechanism of CD11b-Src will help us to further understand the occurrence and development of inflammation and the research and development of anti-inflammatory drugs.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R392
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