視網膜色素變性患者自體誘導多潛能干細胞系的建立與應用
[Abstract]:Background:
Retinal degeneration is a kind of disease characterized by progressive visual function decline, hereditary or acquired acquired. It is a kind of blind eye disease which is frequently seen and difficult to treat in clinical. Retinitis pigmentosa is the most common hereditary retinal degeneration disease. It has many ways of inheritance, many kinds of pathogenic genes and deep pathogenicity. The mechanism is still not clear and there is no effective treatment. For the retinal degeneration disease, because of its limitations, it is difficult to establish an in vitro cell research model.2007 Japanese scientist Yamanaka and others invented the human somatic cell induced pluripotent stem cells (human induced pluripotent stem cell, hiPSC). Technology, in theory, produces a large number of pluripotent stem cells that have the same differentiation potential as embryonic stem cells. The hiPS cells and their differentiated retinal cells, induced by the somatic cells of the patient's own, can be used to establish the cell research model.HiPS cells in vitro for the retina denatured disease and the various types of retina produced by its differentiation. Cells can also explore stem cell replacement therapy in various types of retinal degenerative diseases, hoping to overcome such refractory blinding eye diseases.
Objective:
The purpose of this research is as follows: (1) the skin fibroblasts of patients with retinitis pigmentosa can be introduced into the multipotential stem cells (hiPSC) by introducing foreign genes, and (2) to explore the mechanism of reprogramming of the somatic cells of the retinal degeneration patients in this process, and to lay a foundation for further directional differentiation and mechanism research of retinal cells. Set the foundation.
Materials and methods:
In this study, 1 patients with retinitis pigmentosa with IFT140 gene mutation and 1 normal control subjects were cultured for primary culture, and the human skin fibroblast line (human dermal fibroblast, HDF) was established, and 13.5 day embryos of CF-1 strain mice were taken to isolate and cultivate mouse embryonic fibroblasts (mouse embryonic fibro). Blast (MEF), cultured to P3 generation, was treated with mitomycin C to form feeder layer cells (feeder cell).
In the experiment, four lentivirus plasmids containing Oct4, Klf4, Sox2, c-Myc and lentivirus package plasmids PVSVG and delta 8.91 were used in the experiment to pack four kinds of lentivirus particles containing Oct4, Klf4, Sox2 and c-Myc recombinant genes in human embryonic kidney cells (293HEK-T).
In the P1 generation of human skin fibroblasts, an excessive amount of lentivirus particles and auxiliary agent Polybrene were added at 1:10 proportion to induce human fibroblasts to induce pluripotent stem cells. Fifth days later, the digestive cells were induced to continue to be cultured on the feeder cells made from MEF until the appearance of the morphology of the round embryonic stem cells appeared. Potential stem cell clones. Pick out clones for expansion and maintenance. Detection of fluorescence real-time quantitative PCR for the related genes of human skin fibroblasts before and after infection, and identify the changes in the expression of stem cell related genes and fibroblast specific genes.
Result:
(1) the human skin fibroblast line of the patients with retinitis pigmentosa and normal subjects was successfully established. The morphology of the human skin fibroblast cell line was long spindle shaped, woven and swirling in dense arrangement of the FSP-1 gene. The resuscitation rate was not equal to 50-75% after the cryopreservation.
(2) successful use of MEF cells from CF-1 strain mice was made into feeder cells. After cryopreservation, the recovery rate reached 75%.
(3) using four lentivirus plasmids containing Oct4, Klf4, Sox2 and c-Myc, and lentivirus package plasmids PVSVG and delta 8.91, four lentivirus particles containing Oct4, Klf4, Sox2 and c-Myc recombinant genes were packed in human embryonic kidney cells (293HEK-T). The titers were 1.4 * 107TU/ml, 1.2 * 107TU/ml, 2 * and 3.5.
(4) after infection of the human skin fibroblasts of the lentivirus, the cells gradually became round and the nuclei were enlarged under the microscope. After 18-20 days of infection, the cells were aggregated and round, similar to the cloning of embryonic stem cells.
(5) the level of related gene expression in human skin fibroblasts was compared before and after infection. After infection, the level of FSP-1mRNA was significantly down, and the mRNA level of endo-Oct4/Sox2/Klf4/c-Myc and Nanog genes was significantly up (P0.05).
Conclusion:
In this study, we first used IFT140 gene mutation in the skin fibroblasts of the patients with retinitis pigmentosa. The exogenous gene Oct4, Klf4, Sox2 and c-Myc were introduced in the way of lentivirus induction. The morphological changes of somatic cells similar to human embryonic stem cells were induced, and the specific endogenous genes were expressed in the stem cells.
【學位授予單位】:北京協和醫(yī)學院
【學位級別】:博士
【學位授予年份】:2014
【分類號】:R774.13
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