TNFSF15抑制小鼠顱內(nèi)血管母細胞瘤的生長及出血
[Abstract]:Objective: The surgical removal is the best way to treat the intracranial hemangioblastoma, but it is not effective in the treatment of the key parts (for example, the skull base or the brain stem) and the intracranial multiple angioblastoma. It may be an effective way to treat an abnormal hyperplastic vessel of a hemangioblastoma by an effective chemical agent. Methods: The expression of VEGF/ TNFSF15 and microglia/ macrophage in human hemangioblastoma was detected by immunohistochemical staining. The mouse's hemangioblastoma model was established by stereospecific injection of bEnd.3 cells into the basal ganglia of the mice. The volume of hemangiomas and hemorrhage was evaluated by HE staining, and the expression level of VEGF/ TNFSF15, CD68 +,7/4 + and other immunofluorescent staining were used to analyze the infiltration of hemangiomas. The expression level of VEGF/ TNF15 was analyzed by RT-PCR, Western blotting and ELISA. The cell proliferation assay and the lumen formation assay were used to evaluate the in vitro angiogenesis of bEnd.3 cells. Results: The tumor necrosis factor superfamily member-15 (TNFSF15, also known as the vascular endothelial growth inhibitory factor) was considered an anti-angiogenic factor, and TNFSF15 was able to inhibit the growth of vascular endothelial cells and induce the apoptosis of vascular endothelial cells during the division. To inhibit the transformation of the vascular endothelial progenitor cells to the vascular endothelial cells. TNFSF15 is highly expressed in the microvessel structure of normal persons by immunohistochemical staining, but the expression of TNFSF15 in the human hemangioblastoma is very low, and the up-regulation of the TNFSF15 of the hemangioblastoma may be an effective target for the treatment of the disease. The bEnd.3 cell line derived from mouse endothelioma can secrete a large amount of vascular endothelial growth factor (VEGF), which not only can promote the growth of blood vessels, but also promote the leakage of blood vessels, but the b. End3 cells express a very small amount of TNFSF15, The study found that bEnd.3 cells could form stable hemangiomas in the subcutaneous tissue of the mice. We transplanted b. End3 cells into the intracranial of C57BL/6 mice, and can form the intracranial cell tumor of mice with extremely similar pathological structure to human hemangioblastoma. Compared with the control group, when bEnd.3 cells were transplanted to the high TNFSF15-expressed transgenic mouse, the smaller volume of the hemangioma and the bleeding of the hemangioma can be reduced, with less inflammatory cell infiltration and increased peripheral cell recruitment. More importantly, in the highly expressed transgenic mice of TNFSF15, the level of VEGF expression in the hemangioma can be reduced. By transfecting bEnd.3 cells with lentivirus, the high-expression TNFSF15 of bEnd.3 cells can be induced, and the growth and bleeding of the hemangioma can be inhibited, and the expression of VEGF can also be reduced. The in vitro study also confirmed that TNFSF15 was able to inhibit the growth of bEnd.3 cells and down-regulate the secretion of VEGF. Further studies have found that by using an antagonist of the death receptor-3 (DR-3) to close the function of the DR-3, it is found that TNFSF15 is not capable of exerting the inhibition of bEnd.3 cell proliferation and the inability to downregulate the expression of VEGF, and for this reason we conclude that the TNSF15 is able to down-regulate the expression level of VEGF by the DR3 receptor, Thereby inhibiting the growth of the hemangioma and the occurrence of the hemorrhage. Conclusion: Compared with the normal brain microvessel, we find that there is a pattern of high VEGF expression and very low TNFSF15 expression in human hemangioblastoma, which may induce or aggravate the development of angioblastoma disease. In the model of the intracranial hemangioma of the mouse, the TNFSF15 can inhibit the growth of the hemangioma and reduce the occurrence of the hemorrhage, inhibit the infiltration of the inflammatory cells around the hemangioma and promote the recruitment of the peripheral cells, and can reduce the expression level of VEGF in the hemangioma. The mechanism study found that TNFSF15 is the expression of VEGF by or in part through the DR-3 receptor.
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:R739.41
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