游離的LIFα胞內(nèi)功能片段對HL-60細胞的生長調(diào)節(jié)
[Abstract]:Leukemia inhibitory factor (LIF) is a multipotent cytokine, which acts on various cell tissues and plays different biological roles, and regulates cell growth, proliferation and differentiation widely. Such as inhibiting the differentiation of embryonic stem cells in vitro, stimulating platelet formation, hematopoietic cell proliferation, promoting osteoblast proliferation, promoting neurogen formation, proliferation of muscle satellite cells, and participating in neuromuscular repair. Participate in the acute stage of liver reaction, participate in the physiological and pathological process of inflammation, etc. These biological effects depend on its binding to the LIF receptor 偽 subunit (gp190) on the target cell membrane, forming heterodimer with another subunit (gp130) and activating the downstream signal transduction pathway. Gp190 (LIFR 偽 subunit) is a low affinity LIF specific receptor. It belongs to the hematopoietic receptor superfamily and lacks the activity of endogenous kinase. Soluble LIFR and transmembrane LIFR. exist in physiological state Soluble receptors, free from extracellular, transmembrane and intracellular regions, have antagonistic effects on the normal physiological effects of LIF. Transmembrane LIFR (gp190) contains three functional domains-BOX1,2,3.YXXQ sequence located at the distal end of the membrane (Y tyrosine, X arbitrary amino acid, Q glutamine), which binds specifically to the SH2 site of STAT3. Is there a intracellular free receptor in the cell? how does the intracellular receptor affect signal transduction and exert its biological effect? The effects of free peptides on cell proliferation and differentiation at the membrane receptor signal initiation site have been reported, suggesting that we, The single signal priming site of the single subunit can activate the corresponding signal transduction pathway in the cell under the condition of membrane separation. LIF signal transduction activates the JAK-STAT pathway and the RAS-MAPK pathway. We designed two kinds of small molecules, 190CT2 3 (including BOX2 3) and 190CT3 (including BOX3), according to the different functional domains of the intracellular region of gp190. We found that many functional domains of the intracellular region of gp190 become free peptides in the cell. It has different effects on cell differentiation and activates different signal molecules. In order to further verify the previous work and study the pathogenesis, two leukemia HL-60 cell lines, recombinant 190CT2 3 and 190CT3, were successfully obtained in this study, and the signal transduction pathway related to the YXXQ group site-directed mutation of 190CT3 was further studied. It was found that the proliferation of tumor cells expressing recombinant target genes (190CT2 3 and 190CT3) was inhibited, the cell maturation and differentiation were promoted, and the JAK/STAT3 pathway was activated. Through this study, we have determined the functional effect and phase of 190CT2 3190CT3 on the proliferation and differentiation of acute promyelocytic leukemia cell line HL-60 in the presence of different functional domains of gp190 in the presence of intracellular 190CT2 3190CT3.
【學位授予單位】:第二軍醫(yī)大學
【學位級別】:碩士
【學位授予年份】:2006
【分類號】:R341
【共引文獻】
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6 季e鹲,
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