DNA拓?fù)洚悩?gòu)酶Ⅱ抑制劑以依賴LXR的方式誘導(dǎo)巨噬細(xì)胞ABCA1表達(dá)及膽固醇外輸
[Abstract]:The formation of atherosclerotic plaques is one of the major pathologies of cardiovascular diseases. Macrophages rich in cholesterol and lipids (also known as foam cells) are important components of atherosclerotic plaques. Therefore, maintaining the dynamic balance of cholesterol in macrophages can prevent atherosclerotic plaques and cardiovascular diseases. Reverse cholesterol transport is an important process of cholesterol metabolism and can effectively prevent coronary heart disease.
The protective effect of ATP-binding cassette transporter A1 (ABCA1) on cardiovascular system has been demonstrated in human and animal models. ABCA1 actively and unilaterally transports free cholesterol and phospholipids from macrophages to extracellular cholesterol receiving and extracting by using ATP hydrolysis energy, which is cholesterol outflow and reverse. The key first step in the transport process plays a crucial role in the formation and metabolism of primary HDL. The level of ABCA1 in cells is regulated mainly through transcription, especially through ligand-activated liver X receptor, LXR (an important transcription factor).
Teniposide and etoposide are currently listed as two inhibitors of DNA topoisomerase II. Their mechanisms of action are similar, both of them promote the formation of enzyme-DNA breaking complex, make the equilibrium reaction tend to enzyme-DNA breaking complex, prolong its half-life and stabilize it. The formation and stabilization of breakable complex promote the abnormal weight of DNA. DNA topoisomerase II and its inhibitors have been extensively studied in oncology and immunology, but it is not clear whether etoposide can play a role in other fields. It has been reported that etoposide can significantly slow down the rabbit middle artery. We believe that the inhibitor of DNA topoisomerase II can inhibit macrophage foaming and play an anti-atherosclerotic role by regulating the cholesterol efflux and the expression of related molecules in macrophages. In this paper, we confirm that the inhibitors of DNA topoisomerase II, teniposide and etopo, can inhibit macrophage foaming and play an anti-atherosclerotic role. Both teniposide and etoposide can induce the activity of ABCA1 promoter, which is closely related to the LXRE of ABCA1 promoter and up-regulates the activity of ABCA1 promoter in a LXR-dependent manner. Teniposide and etoposide enhanced the formation of LXRE-LXR/RXR complex. Promoter and EMSA experiments showed that teniposide and etoposide induced ABCA1 expression in a LXR-dependent manner at the transcriptional level. Teniposide and etoposide also demonstrated that teniposide and etoposide could induce other LXR target genes ABCG1 and FASN. Experiments in vivo showed that teniposide and etoposide could effectively induce the reversal of cholesterol transport from macrophages in vivo to in vitro.
In this study, we also found that PD98059 and U0126, inhibitors of MEK1/2, could induce the expression of ABCG1 in macrophages in vitro and in vivo and cholesterol efflux in vivo. U0126 could also induce the expression of ABCG1 in macrophages in atherosclerotic plaques.
To sum up, our results confirm that teniposide and etoposide and other antineoplastic drugs can induce macrophage cholesterol efflux molecule expression and cholesterol efflux, inhibit macrophage cholesterol accumulation, cellular foaming and atherosclerosis. Our work reveals new antineoplastic drugs on the one hand. Function, on the other hand, it provides a theoretical basis for the potential new functions of these drugs.
【學(xué)位授予單位】:南開(kāi)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:R96
【共引文獻(xiàn)】
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