心肌再生過程中心外膜分化方向的譜系追蹤研究
[Abstract]:Objective: To study the differentiation direction of the central outer membrane in the process of myocardial regeneration in neonatal mice. Methods: the apex resection model of wild type mice was constructed and the regeneration was observed by hematoxylin eosin (HE) staining (n=6). Immunofluorescence (n=6) and RT-PCR (n=4) were used to detect the activation of the epicardium in Wt1 (Wilm's Tumor Gene 1). Wt1 specific labelled mice (Wt1GFPCre, n=6 and Wt1CreERT2; Rosa26RFP, n=6) explored the activation and differentiation of the activated epicardium during cardiac regeneration. Results: the wild type 1 days old mice excised the 10%-15% of the apex (apex resection, AR), HE staining (n=6) could completely regenerate the heart 21 days after the neonatal mice. Immunofluorescence staining (n=6) and qRT-PCR test results (n=4) showed that the epicardial cells in the incisional incision at 7 days after AR were activated by a large number of.Wt1GFPCre mice (n=6) AR after 7 days of GFP signal (Wt1 cell specific expression) could be Co located with the marker of epithelial cells converting to mesenchymal cells (EMT), suggesting the epicardial cells activated after AR. EMT.Wt1CreERT2; Rosa26RFP pedigree traced mice at 1 days of age for AR surgery, and 7 days later, RFP signals (specific expression of Wt1 source cells) were able to co localize with alpha Actinin (myocardial cell marker), alpha SMA (vascular smooth muscle cell marker) and FSP1 (fibroblast cell marker) near the incision, indicating that the cells of Wt1 origin after AR can be found. It is differentiated into cardiomyocytes, vascular smooth muscle cells and fibroblasts, and may be involved in the process of regeneration and repair of myocardium. Conclusion: epicardial cells are activated during the regeneration of neonatal mice and can be differentiated into cardiomyocytes, vascular smooth muscle cells and fibroblasts. These findings are cardiac myocytes in cardiac medicine and The regeneration of blood vessels indicates reliable cell source and provides a new idea for clinical research on cardiac regeneration.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R54
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