hMOF的表達(dá)以及其對(duì)組蛋白H4K16乙;富钚栽谖赴┌l(fā)病中的作用研究
[Abstract]:Histone acetyltransferases (HATs) and histone deathylation are important epigenetic regulatory mechanisms, including methylation, acetylation, ubiquitination, phosphorylation and glycosylation. Histone deacetyltransferases (HDACs) are co-regulated to maintain the dynamic balance of acetylation levels in cells. Therefore, any imbalance between acetylation and deacetylation caused by any cause will lead to abnormal cellular processes and even cancer. Recently, more and more research data show that all of them are complete. Acetylation of histone H4 at position 16 lysine K16 (H4K16) may be closely related to the development of some tumors. Acetylation of histone H4K16 in cells is regulated by a variety of histone modifying enzymes, while human acetyltransferase MOF (hMOF) participates in various cellular biological functions mainly through acetylation of H4K16. In order to further study and confirm the expression of hMOF and the acetylation level of histone H4K16 in stomach, we have found that the expression of hMOF may be associated with the development of some cancers, such as renal, ovarian and colon cancers. Correlation between cancers and whether the acetylation level of histone H4K16 in gastric cancer is regulated by other modified enzymes. In this study, we systematically investigated the expression of hMOF in gastric cancer tissues and cell lines by RT-qPCR, Western Blot, cell staining, overexpression and siRNA knockdown techniques. The acetylation level of whole cell histone H4K16 was correlated with the occurrence, clinical stage, pathological stage and prognosis of gastric cancer.
(1) The expression of hMOF gene was detected by RT-qPCR in 52 patients with gastric cancer. Statistical analysis showed that the expression of hMOF gene in 81% (42/52) of the cancer tissues was more than two times lower than that in normal tissues. Lymph node metastasis is associated with distant metastasis and is also associated with survival. However, there is no significant difference in the expression of hMOF gene between different age groups, sex groups and different cell differentiation groups.
(2) The expression level of HDAC4 gene was detected by RT-qPCR in 32 cases of gastric cancer, adjacent to cancer and normal tissues. Statistical analysis showed that the expression level of HDAC4 gene in gastric cancer increased, but there was no significant difference between them. There was no significant difference in metastasis, survival rate and distant metastasis of gastric cancer.
(3) The low expression of hMOF and high expression of HDAC4 were confirmed in two gastric cancer cell lines SGC-7901 and MGC-803 by RT-qPCR, WB and cell staining. The acetylation level of histone H4K16 was significantly lower in SGC-7901 and MGC-803 than in normal gastric mucosal cells GES-1. The results showed that the over-expression of hMOF increased the acetylation level of H4K16, but did not affect the mRNA and protein levels of HDAC4. On the contrary, siRNA knocked down HDAC4, which did not affect the protein surface of hMOF. Da did not increase the level of acetylation of H4K16 due to the decrease of deacetylation.
(4) Histone acetyltransferase hMOF is involved in the pathogenesis of gastric cancer. The acetylation level of H4K16 in gastric cancer cells is mainly regulated by hMOF acetyltransferase, not deacetylase HDAC 4.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:R735.2
【共引文獻(xiàn)】
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