AML1對ZFP36L2的轉(zhuǎn)錄調(diào)控及ZFP36L2對急性髓系白血病細胞生物學功能的影響
[Abstract]:Objective: to investigate the heterotopic formation of AML1-ETO fusion gene (AML1-Eto fusion protein) on chromosome t _ (8) (q22) and to recruit histone deacetylase (Histone Deacetylase,HDAC) to inhibit the normal transcription of AML1 target gene. HDAC inhibitor, (HDACi) phenylbutyrate (phenylbutyrate,PB), in the treatment of AML1-ETO Kasumi-1 cells Can induce apoptosis and differentiation, The expression of many genes such as AML1,PIG7 was up-regulated. Bioinformatics analysis showed that the up-regulated ZFP36L2 gene promoter had the potential binding site of AML1. ZFP36L2 was a RNA binding protein containing CCCH zinc finger structure, which regulated the expression of specific mRNA by accelerating the degradation of mRNA or inhibiting the translation of mRNA. The aim of this study was to investigate the transcriptional regulation of AML1 on ZFP36L2 and the biological function of ZFP36L2 protein in AML cell line Kasumi-1 and HL-60, and to explore its mechanism. Methods: real-time quantitative PCR (qRT-PCR) was used to detect the expression of ZFP36L2 in AML1-ETO cells and cell lines. QRT-PCR and Western blot techniques were used to detect the changes of ZFP36L2mRNA and protein expression in Kasumi-1 cells treated with PB. The reporter plasmid of ZFP36L2 promoter containing AML1 binding site was constructed, and the transcriptional regulation of ZFP36L2 by the transcription factor AML1,AML1-ETO was detected by using double luciferase reporter gene system. Exogenous AML1 and AML1-ETO, were transferred into CV-1 cells respectively to detect the changes of endogenous ZFP36L2 mRNA and protein levels by qRT-PCR and Western blot. The lentivirus expression vector pLVX-Tight-Puro-ZFP36L2, was constructed by using tetracycline induced expression system Tet-On system. The lentivirus expression vector pLVX-Tight-Puro-ZFP36L2, was transfected into HEK293T cells by PEI transfection, and the virus was harvested. Kasumi-1 cells and HL-60 cells were infected and stable clones were screened. During the induction of doxycycline (doxycycline,Dox), the exogenous ZFP36L2 gene can be expressed, but without the Dox induction, the exogenous ZFP36L2 gene can not be expressed, that is, the expression of the gene can be controlled by Dox. QRT-PCR and Western blot, were used to detect the inducible expression of ZFP36L2 at mRNA and protein levels. When ZFP36L2 overexpression was induced, the proliferation, apoptosis, cell cycle and differentiation of Kasumi-1 and HL-60 cells were detected. The changes of apoptotic protein and cyclin were detected by Western blot. The results showed that the expression level of ZFP36L2 in M2b patients was lower than that in non-M2b patients, and the expression of ZFP36L2 in leukemia patients was lower than that in non-M2b patients. The expression level of ZFP36L2 in Kasumi-1 cells was relatively low. PB treatment induced apoptosis of Kasumi-1 cells. The results of qRT-PCR and Western blot showed that the expression of ZFP36L2 increased at mRNA and protein levels. AML1 activated ZFP36L2 promoter reporter plasmid in a dose-dependent manner. However, AML1-ETO had no significant effect on the transcriptional activation of ZFP36L2 reporter plasmids. Overexpression of AML1 could up-regulate the protein expression of endogenous ZFP36L2 in CV-1 cells, but overexpression of AML1-ETO had no effect on the expression of ZFP36L2 protein. When ZFP36L2 gene was induced to express in Kasumi-1 cells and HL-60 cells, cell proliferation was inhibited, cell cycle was blocked in G0/G1 phase, apoptosis was increased, and cell differentiation was not detected. The related apoptotic proteins and cyclins changed accordingly. Conclusion: the new target gene of AML1-ZFP36L2.AML1 transcriptional regulation activates the expression of ZFP36L2. Overexpression of ZFP36L2 inhibits cell proliferation, blocks cell cycle, induces apoptosis, and is a tumor suppressor. When the t (8) chromosome ectopic formed AML1-ETO fusion protein, the above effects were weakened or disappeared, and promoted the development of leukemia. The purpose of this study was to elucidate the regulatory effect of AML1 on ZFP36L2 and the biological role of ZFP36L2 in leukemia cells.
【學位授予單位】:北京協(xié)和醫(yī)學院
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R733.71
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