MCP-3高表達(dá)介導(dǎo)肺癌干細(xì)胞促血管生成并誘導(dǎo)貝伐單抗治療耐藥
[Abstract]:Tumor stem cells are located around blood vessels and rely on vascular microenvironment to maintain self-renewal and dry characteristics. Conversely, tumor stem cells can also promote angiogenesis, thereby maintaining tumor development. However, the role and mechanism of different tumor stem cells in angiogenesis and the response of antiangiogenic therapy are different. The aim of this study was to explore the role and mechanism of lung cancer stem cells in tumor angiogenesis, and to observe the therapeutic effect of lung cancer stem cells against the VEGF drug bevacizumab. In this experiment, lung cancer stem cells were isolated and extracted by whole clone suspension culture, and the difference of tumor angiogenesis between lung cancer stem cells and normal tumor cells was compared in vivo and in vitro. The results showed that the microvessel density of transplanted tumor derived from lung cancer stem cells was significantly higher than that of normal tumor cells, and was not sensitive to bevacizumab therapy. It was also observed in vitro that co-culture of lung cancer stem cells and endothelial cells significantly promoted the proliferation, migration, invasion and tubulogenesis of endothelial cells, and this effect could not be blocked by bevacizumab. In order to explore the mechanism of angiogenesis induced by lung cancer stem cells, we used antibody chip to detect the difference of expression of angiogenic factors in supernatant. The results showed that the expression of MCP-3 and Angiogenin was high in the supernatant of lung cancer stem cell coculture, but the expression of VEGF was low. Exogenous MCP-3, could enhance the biological characteristics of endothelial cell proliferation and tube formation in MCP-3 low expression group (common tumor cells and endothelial co-culture or endothelial culture alone). Induced bevacizumab was insensitive: MCP-3, neutralized supernatant inhibited the above biological characteristics of endothelial cells in lung cancer stem cell co-culture group and partially reversed the drug resistance of bevacizumab. In addition, we also found that PI3K/Akt/mTOR signaling pathway may mediate high expression of MCP-3 in lung cancer stem cell microenvironment. In conclusion, lung cancer stem cells can promote tumor angiogenesis and are resistant to bevacizumab. The high expression of MCP-3 in stem cell microenvironment mediates the VEGF independent angiogenesis of lung cancer stem cells and induces bevacizumab to treat drug resistance. This study not only enriches the theory of anti-angiogenesis in lung cancer, but also provides a new target for enhancing the efficacy of anti-angiogenesis. Targeted MCP-3, can not only inhibit angiogenesis of lung cancer, but also destroy the microenvironment of tumor stem cells and inhibit the regeneration and survival of cancer stem cells.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:R734.2
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