破骨細(xì)胞與成纖維細(xì)胞體外相互作用研究
[Abstract]:Osteoclasts are the only cells in the body that can perform bone absorption, derived from the precursors of the hematopoietic cell line, monocyte macrophage. Osteoclast plays a key role in bone metabolism and remodeling. Osteoclast mediated bone absorption and osteoblast mediated bone formation, formed by a complex mechanism to form a bone mass. Dynamic balance. Fibroblasts have the potential to differentiate into osteogenic differentiation. Nowadays, the role of fibroblasts in ossification is becoming increasingly important. Fibroblast (FB) is the most common cell in the connective tissue of animal, which is differentiated from the embryonic mesenchyme (mesenchymal cell), and the main function is to secrete the extracellular matrix. And collagen, maintaining a connective tissue structure network. It plays a key role in tissue trauma repair and new angiogenesis. In addition, fibroblasts are involved in the pathogenesis of many fibrotic diseases, such as pulmonary fibrosis, renal fibrosis, and scleroderma. Fibroblasts also have a certain osteogenic ability to participate in fracture healing and in ankylosis. There is an important role in the process of heterotopic ossification of diseases such as spondylitis. The mechanism of fibroblast is how to differentiate into osteoblast like cells and cause soft tissue ossification. However, osteoclasts play a vital role in the differentiation of osteoblasts. The condition of osteoclast conditioned culture can be mediated through Wnt/BMP signaling pathway and chemotaxis. Factor sphingosine -1- phosphoric acid induces mesenchymal stem cells to differentiate into osteoblasts. Fibroblasts and osteoblasts belong to the same lineage. Osteoclasts can induce osteoblast differentiation. Therefore, we infer that osteoclasts may participate in and play an important role in the process of fibroblast mediated heterotopic ossification.
Objective: the purpose of this study is to understand the interaction of human peripheral blood mononuclear cells from osteoclast like cells and human ligamentous fibroblasts in vitro. This topic focuses on (1) the study of osteoclast induction for the mineralization of human ligamentous fibroblasts and preliminary exploration of its mechanism of action; (2) observe human toughening Can fibroblast conditioned medium induce osteoclast precursors to osteoclast differentiation?
Contents and methods: isolated peripheral blood mononuclear cells were separated by Ficoll-Paque density gradient centrifugation, and CD14~+ mononuclear cells were separated by immunomagnetic beads; CD14~+ cells were induced to differentiate into osteoclast like cells by two factors of M-CSF and RANKL; the morphological observation, tartarate acid phosphatase (TRAP) staining and scanning electron microscopy were used to observe bone absorption. The characteristics of the osteoclast were fixed. At the same time, the fibroblasts were cultured in the human spinal ligament with collagenase digestion. The osteoclast conditioned medium (Osteoclasts conditioned medium) was used to treat the ligament fibroblasts and the BCIP/NBT alkaline phosphatase chromogenic kit was used to detect the expression of fibrinolytic alkaline phosphatase (ALP), and the alizarin red staining view The mineralized nodules were observed and the mineralization level was evaluated. The expression profiles of mRNA and microRNA (miRNA) in fibroblasts were detected by mRNA expression chip and microRNA chip, and the bioinformatics analysis, such as GO analysis and pathway analysis of differentially expressed genes, was used to make use of another patient's toughening. The fibroblasts cultured in the Central Plains, the repeated conditioned medium and the chip experiment. The osteoclast precursor was cultured in the conditioned medium of fibroblasts, the CD14~+ mononuclear cells were cultured. The positive rate of TRAP was detected by the differentiation.TRAP staining kit of osteoclasts, and the expression of the osteoclast differentiation marker gene was detected by RT-PCR.
Results: the positive rate of alkaline phosphatase expression in fibroblasts cultured with osteoclast cell conditioned medium was significantly higher than that of the control group. Alizarin red staining observed obvious mineralized nodules. Compared with the control group, the expression of mRNA and miRNA were significantly different from the.MRNA expression spectrum chip detection results, 522 genes were up and 415 genes were down regulated. More than two times, miRNA chip results, 28 miRNA up, 59 miRNA down 2 times. Repeat experiment mRNA chip detection results: 3707 mRNA up, 3251 mRNA downregulation, microRNA chip repeat results: 23 miRNA up, 36 miRNA downregulation.
CD14~+ mononuclear cells treated with fibroblast conditioned medium had a positive rate of 40% TRAP, and the expression of TRAP and other osteoclast differentiation markers were detected by RT-PCR.
Conclusion: osteoclast like cells can induce the mineralization of ligamentous fibroblasts in vitro, and miRNA participates in the regulation of expression in this process. At the same time, the conditioned medium of fibroblasts can induce the differentiation of CD14~+ cells to osteoclasts, and the interaction between fibroblasts and osteoclasts in the process of metabolism and differentiation.
【學(xué)位授予單位】:濟南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2011
【分類號】:R329.2
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