TFDP3的表達(dá)調(diào)控及其對(duì)前列腺癌PC3細(xì)胞凋亡的影響
[Abstract]:Prostate cancer (PCa) has a high incidence in male tumors, and has become the second leading cause of cancer death in the United States after lung cancer [1].Traditional clinical treatments for prostate cancer include androgen blockade therapy, surgical treatment and drug castration. Hormone-independent prostate cancer (AIPC) can accelerate the proliferation of hormone-dependent cancer cells without being inhibited by low androgen levels, and ultimately promote the progression or metastasis of prostate cancer. However, with the development of modern molecular biology, gene therapy is expected to become a new and effective method for cancer treatment. Therefore, it is of great scientific and clinical significance to elucidate the molecular pathogenesis and transcriptional regulation mechanism of prostate cancer.
TFDP3 is a new direct regulator of E2F1. Our team used tissue microarray and in situ hybridization to analyze the expression of TFDP3 in normal and cancer tissues. It has been proved that TFDP3 is not a so-called testicular/tumor specific oncogene, but is widely expressed in a variety of tissues and cells. Increased expression in tissues, especially in liver and prostate tissues where TFDP3 is not normally expressed, has been shown to inhibit not only E2F1-induced cell proliferation but also E2F1-induced apoptosis, induce autophagy of prostate cancer cells, and enhance hormone-dependent prostate cancer. The autophagy and anti-apoptosis effects induced by TFDP3 may be one of the key self-protection mechanisms in the transition of prostate cancer from hormone dependence to non-dependence.
In this study, we further analyzed the transcriptional binding sites of TFDP3 promoter region and found that TFDP3 may bind to E2F1 transcription factors. On this basis, we first constructed a fluorescent reporter vector containing TFDP3 gene promoter, and confirmed the regulatory effect of transcription factor E2F1 on TFDP3 at promoter level. Secondly, Western-blo was used to investigate the role of TFDP3 transcription factor E2F1 in TFDP3 transcription. T preliminarily explored the changes of TFDP3 protein level stimulated by E2F1, and confirmed the effect of TFDP3-E2F1 interaction on apoptosis of prostate cancer cells by flow cytometry. Finally, the expression levels of TFDP3 and E2F1 in prostate cancer tissue and normal tissue were analyzed by immunohistochemistry. The expression level in prostate cancer tissues was higher than that in normal tissues. At the same time, with the increase of prostate cancer grade, the expression level of both increased, and the trend was consistent.
1. First, a sequence of about 1064bp upstream of ATG of TFDP3 gene was found by NCBI genomic database, and primers were designed for this sequence. Using human prostate cancer PC3 cell genomic DNA as template, TFDP3 promoter fragments were amplified by PCR and cloned to the upstream polyclonal site of pGL3-Basic luciferase reporter gene. The recombinant vector pGL3-TFDP3-promoter containing TFDP3 gene promoter and luciferase reporter gene. Finally, the constructed recombinant vector pGL3-TFDP3-promoter was transfected into PC3 cells and the luciferase expression activity was detected to verify the existence of TFDP3 promoter sequence or transcriptional regulatory sequence in the cloned fragment.
After co-transfection with E2F1 expression vector, the luciferase activity induced by TFDP3 promoter was significantly higher than that induced by pGL3-TFDP3-promoter alone (1.14 + 0.06vs0.61 + 0.05, P 0.05). It was demonstrated that E2F1 could induce TFDP3 transcription.
2. After transfection of E2F1 expression vector pCMV-E2F1-HA into PC3 cells, the protein was extracted and detected by Western blot. The results showed that the expression of E2F1 and TFDP3 was increased in the E2F1 expression vector group, and the expression of IOD (TFDP3) / IOD (beta-actin) was increased by 2.7 times (0.089 + 0.02vs0.24 + 0.03, P 0.05) compared with the untransfected group. The protein expression was up-regulated.
3. The effect of TFDP3-E2F1 interaction on apoptosis of prostate cancer cells was detected by flow cytometry. It was found that the apoptosis rate of prostate cancer cells increased significantly after transfection of E2F1 expression vector (2.66%+0.001 vs 7.1%+0.003, P 0.05), but decreased significantly after co-transfection with pcDNA3.1-TFDP3 (7.1%+0.003 vs 4.92%+0.002, P 0.05). The results showed that TFDP3 could inhibit the apoptosis of prostate cancer cells induced by E2F1 to some extent.
4. The expression of TFDP3 and E2F1 in prostate cancer tissue and normal prostate tissue were detected by immunohistochemistry. The results showed that compared with normal prostate tissue, the expression of TFDP3 and E2F1 in prostate cancer tissue were increased. At the same time, the expression of TFDP3 and E2F1 increased with the increase of prostate cancer grade. The growth trend of the two is the same.
To sum up, we constructed a fluorescent reporter vector pGL3-TFDP3-promoter for TFDP3 promoter region, and preliminarily determined that E2F1 could regulate the transcriptional and expression levels of TFDP3 promoter region by using dual luciferase detection system and Western blot, which proved that E2F1 was involved in the regulation of TFDP3 gene expression. The expression levels of TFDP3 and E2F1 in normal prostate tissue and prostate cancer tissue were measured. Flow cytometry showed that TFDP3 could bind to E2F1 and inhibit the apoptosis of prostate cancer cells effectively, thus playing an important role in protecting the survival of prostate cancer cells. The apoptosis of prostate cells promotes the survival of prostate cancer cells.
【學(xué)位授予單位】:第四軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:R737.25
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