Smad4介導(dǎo)的丙戊酸鈉(VPA)抑制腎細(xì)胞癌上皮間質(zhì)轉(zhuǎn)化(EMT)的機(jī)制研究
[Abstract]:[Objective] Renal cell carcinoma (RCC) is one of the most common renal malignancies in the world, accounting for 2-3% of all human tumors, and clear cell carcinoma is the most common type. The tumor-specific survival rate (70%) of patients with metastatic renal tumors was only 27.1% at 5 years, and clear-cell renal carcinoma tended to metastasize. Unfortunately, the mechanisms of metastasis and resistance to treatment of renal tumors are still not fully understood. More research and attention are needed here. Transforming (EMT) is a pathophysiological process in which epidermal cells transform into mesothelial cells. It plays an important role in the invasion and metastasis of tumor to adjacent and distant tissues and organs. This phenomenon is caused by multiple complexes and growth factors in the tumor microenvironment. TGF-beta is such a factor that can promote and inhibit tumor invasion and metastasis. Smad4 is considered to be a key intermediate transduction protein in the TGF-beta pathway and BMP signaling pathway. Studies have shown that the deletion of Smad4 proteins disrupts the classical signal pathway of TGF-beta and TGF-beta is suppressed by early tumors. Through the classical and non-classical pathways of the TGF-beta signaling pathway, TGF-beta plays a potential role in inducing the formation of EMT. Smad4 protein can be used as an independent prognostic factor in patients with renal tumors. Histone acetylation and deacetylation are epigenetic modifications of histones that regulate gene expression. Histone acetyltransferases and deacetylases play an important role, accompanied by histone acetylation and deacetylation, which affect the silence and activation of tumor gene expression. VPA belongs to class I HDAC inhibitors. For decades, VPA has been used as a classical antiepileptic drug in clinic. It has been found that VPA also has a variety of anti-swelling properties. According to current research, VPA has the ability to regulate the expression of Smad4 and inhibit the invasion and metastasis of tumor. Considering the important role of Smad4 in the process of EMT, we believe that VPA may inhibit the EMT process by regulating the Smmad4 protein. [Methods] Renal cancer cell lines were stimulated by VPA at different concentrations and at different time of action. The changes of Smad4 and EMT related indexes after VPA treatment were verified by real-time quantitative PCR and Western blotting. Smad4 plasmid and small interfering RNA were overexpressed and transfected into renal tumor cells 786-0. Immunohistochemistry was used to detect the expression of Smad4, TIF1-gamma and TGF-beta in 39 cases of renal clear cell carcinoma (RCC) in the Department of Pathology, East Hospital of Provincial Hospital. Our study indicates that VPA inhibits the EMT process of renal cell carcinoma by altering the expression of Smad4. Smad4 is induced by TGF-beta 1 to form Smad3/4 complex, which induces the EMT process of tumor, and can be used as an anti-tumor target to inhibit the invasion of renal cell carcinoma.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:R737.11
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