髓系特異性CXCR4敲除影響小鼠下肢缺血恢復的研究
[Abstract]:The study of the background of the background of the background is a serious threat to human health, and how to solve the post-ischemic tissue repair and function recovery is the current research hotspot. Inflammation is an essential condition for post-ischemic tissue repair and angiogenesis, and moderate inflammatory response can help to remove necrotic tissue, promote angiogenesis, and excessive inflammatory reaction can aggravate tissue damage and promote further deterioration of ischemic lesions. Chemokines play a critical role in the process of inflammatory cell infiltration. Various chemokines and their receptors have been shown to be involved in the control of the recruitment of post-ischemic inflammatory cells, including the matrix-derived factor (SDF-1) and its ligand CXCR4. And the preliminary studies have shown that the SDF-1/ CXCR4 axis is involved in the regulation of post-ischemic inflammatory response and angiogenesis. However, the role of the SDF-1/ CXCR4 axis in ischemia-related inflammation and repair is still unknown. Objective To study how CXCR4 regulates the recruitment of neutrophils and macrophages at the lower extremity of ischemia, and discusses the effect of CXCR4 on the inflammatory response and repair of inflammatory cells. Methods: We obtained the mouse (MKO) specific to the specific CXCR4 knock-out of the myeloid cells (mainly neutrophils and macrophages) through the Cre-LoxP gene knockout technique. We tested the weight, spleen size and peripheral blood image of MKO mice, and detected the expression of CXCR4 on the surface of neutrophils and macrophages. The lower limb ischemia model of the mice was constructed by ligation of the femoral artery, and the blood flow recovery in the lower extremities of the mice was observed by laser Doppler and the condition of the foot-toe necrosis was observed. In this paper, the expression of the inflammatory cytokines in the ischemic myocardium was detected by immunohistochemistry and flow cytometry, and the expression of the inflammatory factors of the lower limb was detected by PCR. In vitro, we observed the effects of the SDF-1/ CXCR4 axis on the ability of neutrophils and macrophages to migrate and to observe the effects of CXCR4 knockout on the two cell proinflammatory capabilities. In order to further clarify the effects of CXCR4 on the polarization of macrophages, we respectively induced the M-and M2-type polarization of bone marrow macrophages from the source of MKO or WT by lipopolysaccharide (LPS) and interferon-1 and interleukin-4, respectively, and the expression level of the related polarized markers was detected by qPCR. The results showed that the number of peripheral blood in the bone marrow of the MKO mice was significantly increased. In the control group, the lower limb ischemic recovery of the MKP mice was significantly worse, and the degree of toe necrosis was more serious, however, the long-term prognosis of the mice was not affected. It is suggested that the expression of CXCR4 in the myeloid cells plays an important role in the recovery of ischemic blood flow in the lower limbs. Compared with control mice by immunofluorescence staining and flow cytometry, the number of CDl1b positive cells and the number of neutrophils in the early ischemic muscle of the MKO mice increased significantly, and then decreased rapidly, and the expression of the inflammatory factors increased. However, that numb of macrophages did not change significantly. In vitro, we found that CXCR4 knock-out has no effect on the ability to release a neutrophil inflammatory factor, significantly enhancing the ability of macrophages to polarize M1 from M0 to M2 without changing its ability to polarize M2. At the same time, CXCR4 knock-out does not affect the ability of neutrophils to migrate to SDF-1, and the ability to migrate macrophages is impaired. These results suggest that the knock-out of the SDF-1/ CXCR4 shaft of the myeloid cells can enhance the inflammatory reaction of the early-stage repair of the ischemia, and has no significant effect on the phase of the middle and later stage. The results show that CXCR4 is a key chemokine receptor for regulating the recruitment of inflammatory cells after lower limb ischemia. The deletion of CXCR4 can cause excessive neutrophil infiltration in the acute stage, and can increase the inflammatory response by promoting the polarization of the macrophage to the M1. Then the early-enhanced inflammatory reaction enhances the early blood flow perfusion recovery in the early stage of the ischemia, and prompts the inflammation to function in the post-ischemia tissue repair.
【學位授予單位】:浙江大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:R543
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