肝X受體和5-氮雜-2’-脫氧胞苷通過(guò)上調(diào)SOCS3而分別抑制肝癌和腎癌細(xì)胞增殖的實(shí)驗(yàn)研究
[Abstract]:Study Background: The cytokine signal-inhibiting protein 3 (SOCS3) is an important inducible anti-tumor molecule, which can be induced to be expressed in a variety of tissues, including liver cells. a cell comprising an N-terminal variable region, a central core SH2 structure region and a C-terminal SOCS box region group, As a negative regulator of JAK-STAT signal pathway, SOCS3 plays an important role in inhibiting the growth of tumor and promoting the apoptosis of tumor cells. On the one hand, SOCS3 can induce the expression of P21 and then inhibit the proliferation of cells. On the other hand, after the expression of SOCS3, Bcl-2 can be down-regulated while the Casepase3 is up-regulated, thus promoting the growth of tumor cells. However, in the field of research on the regulation of the expression of Socs3 gene, Low. The liver X receptor (LXR) is a ligand-dependent transcription factor, a kind of nuclear receptor, as a multi-function transcription factor, LXR is widely involved in the regulation of metabolism of substances (sugar, fat and cholesterol) and anti-inflammatory, neurodegenerative diseases such as Alzheimer's disease. Recent studies have shown that the anti-tumor effect is a new function of LXR, which plays an important role in inhibiting the proliferation of different types of tumor cell lines, such as hepatocellular carcinoma, prostate cancer, breast cancer, colon cancer, cervical cancer, lymphoma, and ovarian cancer. and the like, but the specific anti-tumor mechanism is not very clear. If LXR and SOCS3 both have anti-tumor function, and SOCS3 is in the expression or non-expression state in tumor cells, the ability of LXR to play an anti-tumor function by promoting the expression of SCOS3 is not yet reported. As a methyltransferase inhibitor, the 5-nitroza-2 '-donor cell can block the cell cycle of the tumor in the G2 phase, but the molecular mechanism of this process is still unclear. Objective: To study the molecular mechanism of the expression of SOCS3 by LXR and the role of SOCS3 in the inhibition of the proliferation of the human hepatocellular carcinoma (HCC) cell line and the division of the cell cycle of the tumor. a sub-mechanism. Methods: (1) Two kinds of liver cancer cell lines HepG2 and Hep3B were treated with two agonists TO901317 and GW3965 of LXR, and m-RNA and reverse transcription c-DNA were extracted, and then the expression of the Socs3 gene was detected by RT-PCR and QRT-PCR, and the total protein in the cells was extracted, and the SCOS3 was detected by Western blot. CylinD1, P21 and P and (2) predicting the binding site of the LXR in the promoter region of the SOCS3 on the nuclear receptor website, constructing a recombinant plasmid of the upstream promoter region of the SOCS3, 3) Detection of LXR Agonist by CCK-8 and Flow Cytometry in the Treatment of Hepatocarcinoma Cell Line HepG2 The effect of LXR agonist on the proliferation and cycle of HepG2 and Hep3B cells of the liver cancer cell line HepG2 and Hep3B was detected by siRNA, and the corresponding cell cycle protein cyclin D1 was detected by WB. and the expression of p21 and p27. (5) Xenograft hepatoma cell line HepG2 was carried out on the underarm of nude mice. After the tumor was formed, the tumor-bearing mice were injected with TO901317 (25mg/ kg/ day), and the effect of TO901317 on the growth of the tumor was observed and the SO-PCR, WB and immunohistochemistry were used to detect the SO. Changes in the level of CS3 mRNA and protein. (6) After 5-nitroza-2'-yeast cell-treated cells, CC K-8 and flow cytometry for cell proliferation and cycle. (7) Semi-quantitative PCR to detect the mRNA of SOCS3 and methyltransferase Level, WB detects levels of SOCS3 and p21. (8) After interference with SOSS3, WB detects 5-N-to-2 '-The effect of cytoskeleton on the level of p21 protein. Results: (1) Two agonists of LXR, TO901317 and GW3965 Up-regulation of the level of SOCS3 protein and m-RNA can be dose-dependent. (2) LXR agonists cannot upregulate the promoter activity of SOCS3, resulting in an up-regulation of SOCS3 mRNA The reason is that the LXR agonist increases the stability of the SOCS3 mRNA. (3) The TO901317 can be dose-dependent The inhibition of the proliferation of the liver cancer cell line HepG2 and the cell cycle arrest in the G1 phase. (4) The effect of the proliferation of LXR anti-tumor cells was weakened after interfering with the expression of SOCS3. (5) In the subcutaneous xenograft model of nude mice, TO90131 7 can inhibit the growth of the tumor-bearing mouse HCC and increase the level of the SOCS3 protein and the mRNA.) 5-aza-2'-pyocyanin can inhibit the cell cycle of the kidney cancer in the G2 phase and inhibit cell proliferation. (7) 5-aza-2 '-pyocyanin can reduce the mRN of the DNA methyltransferase 1/ 3a. The level of the mRNA of SOCS3 and the level of the protein of SOCS3 can be increased, and the level of the protein of SOCS3 and p21 can be improved. (8)) in dry Conclusion: (1) LXR Agonists increase the level of SOCS3-RNA and protein by enhancing the stability of SOCS3 mRNA. (2) In the liver cancer cell lines HepG2 and Hep3B, LXR agonists can reduce cyc by up-regulation of SOCS3. lin D1 protein level, increase the protein level of p21 and p27, block the cell in G1 phase, and finally inhibit cell proliferation. (3) 5-nitroza-2'
【學(xué)位授予單位】:第三軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:R735.7;R737.11
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