EGFR信號通路通過Egr2促進骨祖細(xì)胞增殖并抑制骨祖細(xì)胞凋亡的實驗性研究
[Abstract]:The maintenance of the structural integrity of the bone tissue depends on the continuous update of the osteoblast in the bone progenitor cell, which is finely regulated by a number of growth factors. The epidermal growth factor receptor (EGFR) ligand is currently known as the mitogen of the bone progenitor cells. However, the specific mechanism of these ligands for modulating the pool of bone progenitor cells is not described in detail, in particular the role of the EGFR signaling pathway in the regulation of the apoptosis of the bone progenitor cells. In this study, we confirmed the activation of the EGFR signaling pathway by promoting the proliferation of bone progenitor cells and inhibiting the apoptosis of the bone progenitor cells and increasing the number of bone progenitor cells. The conclusion is further confirmed in the experiment of rat skull tissue organ culture. In the experiment of rat skull tissue organ culture, the epidermal growth factor (EGF) increased the number of proliferating cells and decreased the number of apoptotic cells, thus increasing the total amount of osteoblast. Microarray analysis of the cell line MC3T3 cells suggested that the EGFR signaling pathway could induce the expression of anti-apoptotic gene Mcl1 and early growth response genes (Egr1, Egr2, Egr3). The inhibition protein Nab2 over-expression of Egrs can inhibit the increase in the number of EGF-induced bone progenitor cells. Further experiments show that the expression of Egr2 is reduced by SiRNA, and the increase of the amount of the EGF-induced bone progenitor cells can be suppressed, and the increase of the amount of the EGF-induced bone progenitor cells is not affected by the reduction of the expression of Egrl, Egr3 in the SiRNA. Further studies have shown that Egr2 is a major mediating gene for EGF to promote the proliferation of bone progenitor cells and to inhibit the apoptosis of bone progenitor cells. Using the method of adenovirus overexpression, inhibitor and SiRNA, we confirmed the activation of the MAPK/ Erk pathway in the EGFR signaling pathway, and further induced the expression of Egr2, which resulted in an increase of Mcll, which ultimately inhibited the apoptosis of the cells. At the same time, the other bone progenitor cell mitogen and the survival factor fibroblast growth factor (FGF)2 can also promote the proliferation of the bone progenitor cells and inhibit the apoptosis of the bone progenitor cells by inducing the expression of the Egr2. These results indicate that Egr2 plays an important role in the growth factor-mediated increase in the number of bone progenitor cells. In general, our experimental results clearly illustrate the EGFR signaling pathway and play an important role in the regulation of the biological function of the bone progenitor cell by inducing the expression of Egr2, promoting the proliferation of the bone progenitor cells, and inhibiting the apoptosis of the bone progenitor cells.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2012
【分類號】:R329
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