子宮內(nèi)膜再生細胞在潰瘍性結(jié)腸炎模型中免疫調(diào)節(jié)的相關(guān)機制研究
[Abstract]:Objective: To investigate the role of endometrial regeneration cells (ERC) in the immune regulation of mice with ulcerative colitis (UC) and its related mechanism. Methods: 1) The menstrual blood of healthy female volunteers of childbearing age was collected with a menstrual cup, and the mononuclear cells were isolated by standard Ficoll method. The cells were cultured and identified by flow cytometry. To determine the surface antigen of ERC. 2) SPF BALB / c mice were used to establish UC mice model by drinking different concentrations of sodium dextran sulfate (DSS) solution. The general conditions, disease activity index (DAI) and histopathological changes of the experimental animals were observed during the modeling period. The best concentration of DSS was selected and the animal model was evaluated. 3) The animal model was established by P KH26 (Paul Karl Horan 26) was used to label ERC in vitro. The labeled ERC was applied to UC animal model to observe the distribution of ERC in vivo. 4) PD-L1 antibody was used to block the surface of ERC cells. In vivo, ERC blocked by ERC and PD-L1 antibody was applied to UC animal model (divided into four groups: (1) Normal. Control group: free drinking water without DSS; (2) untreated group: free drinking 3% DSS solution + intravenous PBS buffer; (3) ERC group: free drinking 3% DSS solution + intravenous PBS buffer suspension of ERC; (4) PD-L1 blocked ERC group: free drinking 3% DSS solution + intravenous PBS buffer suspension of PD-L1 blocked ERC, 2, 5, 8 On the 8th day, all groups were changed to drinking water. During the experiment, the general condition of experimental animals in each group was observed and recorded daily, and the DAI score was made. On the 15th day, all the mice were sacrificed. Colon length, colon pathological changes were observed under microscope, CD3~+CD4~+T, CD3~+CD8~+T, CD4~+CD25~+Foxp3~+Tregs, CD11c~+MHC-II~+DCs, F4/80~+CD206~+M cells in spleen were detected by flow cytometry, and TNF-a, IFN-gamma, IL-10, TGF-beta in normal and pathological tissues were detected by ELISA and q-PCR. In vitro, spleen cells were isolated from normal mice, and ERC was co-cultured with spleen cells or PD-L1-blocked ERC was co-cultured with spleen cells. Splenocytes were stimulated with different cytokines (divided into four groups: (1) untreated group: spleen cells were cultured alone; (2) ERC treatment group: ERC and spleen Cells were co-cultured; (3) PD-L1-blocked ERC treatment group: PD-L1-blocked ERC and spleen cells were co-cultured; (4) Transwell culture group: ERC and spleen cells were co-cultured without contact, using flow cytometry analysis of CD3~+CD4~+T, CD3~+CD8~+T, CD4~+CD25~+Foxp3~+Tregs, CD11c~+MHC-II~+DCs, F4/80~+M, F4/80~+M, CD206~+ cells in different groups. Results: 1) ERC could express PD-L1, CD90, CD105, but not CD34 and CD45; with the increase of IFN-gamma concentration, the expression of PD-L1 on the surface of ERC increased correspondingly. 2) With the increase of DSS concentration and the prolongation of modeling time, the general condition of model mice increased gradually. Pathological changes include: the infiltration of neutrophils, macrophages, lymphocytes, pits distorted, lamina propria thickened, lymphatic follicles formed in submucosa, intestinal inflammation aggravated gradually. 3) PK H26 fluorescence labeled ERC was injected into UC mice by tail vein on the 5th day of modeling. The tissues were taken at 48h of ERC injection. Fluorescence microscopy showed that the fluorescence intensity was lung, liver, spleen, colon, kidney and no fluorescence was observed. The fluorescence intensity of colorectal lesions in model group was higher than that in normal group. LIGHT INTENSITY.4) In vivo, caudal vein injection of ERC had significant protective effect on colorectal inflammation in mice, and blocked surface of ERC by PD-L1 significantly decreased the protective effect of ERC on colorectal inflammation in mice. Compared with untreated group, the number of splenic CD3~+CD4~+T, CD3~+CD8~+T cells and CD4~+CD25~+Foxp3~+Tregs cells in ERC group decreased significantly (P 0.05), and the number of CD4~+CD25~+Foxp3 The number of CD11c~+MHC-II~+DCs decreased significantly (P 0.05), F4/80~+M cells decreased significantly (P 0.05), F4/80~+CD206~+M increased relatively (P 0.05), TNF-a, IFN-gamma m RNA transcription and protein expression decreased (P 0.05), IL-10, TGF-beta m RNA transcription and protein expression increased in colorectal lesions. Compared with the ERC group, the number of CD3~+CD4~+T, CD3~+CD8~+ cells in spleen and CD4~+CD25~+Foxp3~+Tregs cells in PD-L1-blocked ERC group increased (P 0.05), the number of CD4~+CD25~+Foxp3~+Tregs cells decreased (P 0.05), the number of CD11c~+MHC-II~+DCs cells increased (P 0.05), the level of TNF-a, IFN-gamma m RNA transcription and protein expression in colorectal tissues increased relatively. Compared with the normal control group, the number of CD3~+CD4~+T, CD3~+CD8~+T, CD11c~+MHC-II~+DCs, F4/80~+M cells and the number of CD4~+CD25~+Foxp3~+Tregs, F4/80~+M cells in ERC co-culture group were decreased after stimulation with different stimuli. The number of CD3 + CD4 + T, CD3 + CD4 + T, CD3 + CD8 + T, CD11c + MHC - II + DCs, F4 / 80 + M cells were relatively increased, CD4 + CD25 + Foxp3 + Tregs, F4 / 80 + Tregs, F4 / 80 + CD206 + M cells were relatively decreased; the number of CD3 + CD3 + CD4 + CD4 + CD4 + CD4 + T, CD3 + CD3 + CD3 + CD3, CD3 + CD3 + CD3 + CD8 + CD8 + CD8 + CD8 + CD8 + DCs, CD11c + MHC - II + DCs, F4 / 80 + M cells were relatively increased, CD4 + CD4 + CD4 + CD4 + CD25 + CD25 + Foxp3 + Tregs, F4 / 80 + CD80 s, F4/ The number of CD4~+CD25~+Foxp3~+Tregs and F4/80~+CD206~+M cells were relatively decreased. CONCLUSION: 1) ERC isolated from menstrual blood is a kind of MSC-like regenerative cells. ERC is not only abundant in source, but also noninvasive, and the expression of ERC on the surface plays an important role in inducing immune tolerance PD-L1.2) 3%. DSS is an ideal concentration for constructing UC animal model of BALB/c mice. It can not only simulate the pathological changes of human UC intestine, but also has no mortality in mice. In vivo and in vitro experiments showed that ERC inhibited the maturation and differentiation of DCs and the proliferation of CD4~+T and CD8~+T cells, promoted the production of Tregs cells and M2 cells, and in vitro experiments also showed that PD-L1 on the surface of ERC acted through direct contact. And then play the role of immunomodulation.
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:R574.62;R-332
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