成年小鼠心臟干細胞的分離、培養(yǎng)及其離子通道特性
[Abstract]:It has long been seen that the heart of the adult mammalian heart is in the post-mitotic phase, i.e. the heart is the terminal-differentiated organ and does not have the ability to self-update. The discovery of mitosis in the heart makes it possible to recognize that there may be stem cells in the heart. Recent experimental results confirm the presence of cardiac stem cells, which are now highly concerned by the biomedical community. The heart has now been isolated from the heart of adults and other mammals Stem cells. Cell transplantation or in situ activation, cardiac stem cells have the ability to regenerate muscle cells, and can improve heart dirty. However, the methods of separating and culturing cardiac stem cells in various reports do not To do the same. Ion channel characteristics prior to differentiation of heart stem cells have not yet been This experiment is devoted to the establishment of an effective and reproducible method for the isolation, culture and identification of cardiac stem cells in adult mice, and on the basis of which the types of ion channels present before differentiation of cardiac stem cells are studied. characterized in that the first part is divided into annual mouse heart stem cells Isolation, culture and identification of cardiac stem cells in adult mice were isolated by Langendorff method, and the hearts of mice were perfused with collagenase. The preparation of a single myocardial cell by the enzymatic method, the differential centrifugation method takes larger cells (e.g., ventricular myocytes). Cells are separated from smaller cells. Smaller cells are taken, incubated with c-kit antibodies, and then immunomagnetic The results show that the number of isolated cells is about 104, the morphology of the cells is round, the observation is bright under the mirror, one or more magnetic beads are provided on each cell, and the diameter of the cells is small. The cells cultured and isolated from adult mouse heart stem cells are first cultured in serum medium for 48 hours to remove adherent heteroatoms, and then suspended cells are transferred to another culture dish, The results showed that after two days of incubation, a small number of cells began to adhere, after five days of incubation, more cells began to adhere to the wall and seven to ten. After days, small clones were formed and allowed to grow continuously. The identification of fresh isolated primary and post-infected cells in adult mouse heart stem cells was identified by immunofluorescence Phenotyping, fluorescence was observed under a laser scanning confocal microscope. The results showed that both primary and passaged cells had green fluorescence to demonstrate that their phenotype was c-kit, There was no change in the phenotype of cardiac stem cells. Post-generation cells retain stem cell characteristics without differentiation In the second part of adult mouse cardiac stem cell ion channel characteristics, CSCs were cultured on adherent growth with 0. 25% after the formation of larger clones. Trypsin digestion, after most of the cells shrink back to a circle, use serum terminate the digestion. A portion of the cell is used for passage, and a portion of the cells are stored for an oral test. recording the ion channel electricity in the forceps mode by using the whole cell method of recording and recording. Flow. The results showed that there was an ionic current in the undifferentiated adult mouse heart stem cells. We recorded two types Current, an outward current, slower activation, and the other is the inward current. The current recorded on most of the heart stem cells For external current, the activation speed is slow, voltage dependent, and has non-deactivation characteristic. This external current is sensitive to TEA and can be Conclusion: (1) collagenase enzymatic hydrolysis and immunomagnetic bead separation can be used to separate and separate more pure and larger number of heart stem cells; (2) isolated cardiac stem cells. There was regeneration and cloning ability; (3) fresh isolated cardiac stem cells had c-kit phenotype, and c-kit phenotype was still present after decapsulation; (
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2008
【分類號】:R329
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