雌激素受體ERα亞細(xì)胞定位及其與細(xì)胞生長(zhǎng)的相關(guān)性
[Abstract]:Estrogen receptor (estrogen receptor,ER) is a member of nuclear receptor superfamily (nucleus receptor,NR). As a hormone receptor, ER can be activated by estradiol estradiolone E2, the main component of estrogen. ER is widely distributed in female or male reproductive system, mammary gland, and parts of central nervous system. At the same time, ER also participates in various important physiological regulation processes such as cell proliferation, differentiation and apoptosis. ER can be divided into two subtypes, ER 偽 and ER 尾, which are composed of four different functional domains, each of which plays a different role. The four functional domains are: transcriptional activation region (A- / B), ligand binding region (LBD), hinge region (Hinge) and DNA binding region (DBD). In this paper, we constructed different deletion mutants of ER 偽 (ER LBD,ER DBD and ER Hinge) to study the effects of different functional domains on the subcellular localization of ER 偽 in cell proliferation, subcellular localization and E2 stimulation. The results showed that the distribution of ER 偽 was less, that of ER LBD was nuclear localization, that of ER DBD was less than that of nucleus, and that of ER Hinge was mainly distributed in plasma, and there was a small amount of ER Hinge in nucleus. Further analysis showed that E2 induced ER 偽 nucleation was (NLS) dependent. In addition, we also found that ER 偽 can enhance the proliferation of 293T cells, and this proliferative effect depends on the normal transport of ER 偽 in nucleus and cytoplasm. Retinoid X receptor (retinoid X receptor, RXR) is a member of steroid / thyroid hormone receptor superfamily, and its ligand retinoid (retinoids) is a natural or synthetic vitamin A derivative. Retinin plays an important role in cell growth, differentiation and apoptosis through RXRs. RXR 偽 can bind with ER 偽 to form heterodimer, but the role of RXR 偽 in assisting ER 偽 transport has not been reported. Our results show that RXR 偽 can assist the nucleation of ER DBD and ER Hinge, and when E2 is treated, the ER DBD of the nucleation returns to the nucleus, but the ER Hinge of the nucleus is not affected. The results suggest that different functional domains of ER 偽 play different roles in the interaction with RXR 偽 and E2. In conclusion, we confirmed the role of different functional domains of ER 偽 in its subcellular localization and proliferation, and found that RXR 偽 can assist ER DBD and ER Hinge to produce nuclei. This provides us with some ideas for further study on the mechanism of ER 偽 and E2 and for more effective prevention and treatment of breast cancer.
【學(xué)位授予單位】:廈門大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2006
【分類號(hào)】:R341
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