配子生成素結(jié)合蛋白(GGNBP2)在乳腺癌增殖和轉(zhuǎn)移中的調(diào)控作用及機制研究
[Abstract]:BACKGROUND: Researchers used software to analyze 693 genes encoded in the 17q12-q23 region of human chromosome, including a 6.3 MB gene called gametogenetin binding protein 2 (GGNBP2) upstream of BRCA1 gene. Our Research Group intends to elucidate the role and mechanism of GGNBP2 in the proliferation and metastasis of breast cancer cells through clinical data, in vivo and in vitro experiments, and to understand the function of GGNBP2 gene in the development of breast cancer. Target: Methods: 1. Differential expression of GGNBP2 in nine normal human tissues was detected by multi-tissue array analysis, and the expression of GGNBP2 in normal breast and breast cancer tissues was compared. The expression of GGNBP2 in metastatic breast cancer and non-metastatic breast cancer tissues was compared. 2. Wnt1 was detected by RT-PCR assay. Differential expression of GGNBP2 in normal breast tissues and breast cancer tissues of transgenic mice. 3. Overexpression of GGNBP2 was constructed in different ERalpha state cells, and cell growth curves were drawn. Estradiol was used to stimulate cells with different GGNBP2 levels to detect their sensitivity to estradiol stimulation. Morphological and quantitative changes of maternal T47D cells and T47D-GGNBP2 cells. 4. Scratch test, Transwell test and soft agar cloning test were used to detect the different mobility, invasiveness and tumorigenicity of T47D-His C cells and T47D-GNBP2 cells, respectively. The effects of overexpression of GGNBP2 on the biological behavior of breast cancer cells were observed. 5. Polyhistidine Pull-down assay was used to detect the binding of ERa, ERbeta and GGNBP2 protein, and estradiol was used to stimulate and compare the changes of co-precipitation. 6. Luciferase expression vectors of GGNBP2 overexpression vector (pc DNA 3-GNBP2) or empty vector (pcDNA3-His C) and estrogen response unit (ERE) were co-transfected into T47D cells. The expression of CCND1 and TFF1 proteins in T47D-His C cells and T47D-GGNBP2 cells was detected by Western blot. 7. An in vivo transplanted tumor model was established to detect the effect of GGNBP2 expression on the biological behavior of breast cancer. The expression of GGNBP2 was detected in breast, ovary, uterus, stomach, kidney, colon, rectum, thyroid and prostate cancer. The expression of GGNBP2 was the highest in breast tissue and the lowest in kidney tissue. The expression of GGNBP 2 in 50 paired tissues of human normal breast gland and breast tumor was studied. It was found that the expression of GGNBP 2 in breast cancer was significantly decreased, and the expression of GGNBP 2 was also down-regulated in the metastatic tissues of the same patient. 2. In the spontaneously generated breast tumor tissues of Wnt1 transgenic mice, the expression of GGNBP 2 in M RNA water was observed. In human breast cancer cell lines or normal breast cell lines T47D, MCF-7, MCF-10A and MCF-10F, stable GGNBP2 overexpression cell lines were constructed. After 4 days of culture, compared with empty plasmid transfected breast cancer cell lines, only ER-positive T47D and MCF-7 GGNBP2 overexpression cell lines were constructed. The proliferation of T47D cells stably overexpressing exogenous GGNBP2 was significantly lower than that of the control group (T47D-His C group). Compared with T47D-His C cells, T47D-GGNBP2 clone 15 cells were not sensitive to estradiol stimulation. The cell mass of T47D-GGNBP2 cells was smaller and the number of T47D-GNBP2 cells was significantly lower in three-dimensional culture space. Compared with T47D and T47D-His C cells, the migration and invasion of T47D-GGNBP2 cells were decreased, and the cloning ability of T47D-GGNBP2 cells was significantly down-regulated by soft agar cloning assay. 6. Histidine Pull-down assay showed that only ERa could co-precipitate with His-labeled GGGGNBP2, but ERbeta was not related to GGNBP2, and 1 mu was found. The results of luciferase reporter gene showed that estradiol could activate the transcriptional activity of ERE in T47D-His C cells. However, in T47D-GGNBP2 cells, the transcriptional activity of ERE induced by estradiol decreased significantly 8. The nude mice transplanted tumor model was constructed and the tumor volume in vivo was detected. Compared with maternal T47D transplanted tumor, the growth ability of T47D-GGNBP2 in vitro transplanted tumor decreased significantly. Conclusion: 1. Clinical data and mouse experimental results showed that GGNBP2 was expressed in normal breast tissue, and GGNBP2 was down-regulated in breast cancer tissue, indicating that GGNBP2 is closely related to the occurrence and development of breast cancer. 2. GGGNBP2 can be found in breast cancer. GGNBP2 can act as a co-inhibitory protein of ER-alpha to regulate the expression or activity of its target genes CCND1 and TFF1, and ultimately regulate the proliferation of breast cancer cells.
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R737.9
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