DNMT1誘導SOCS1高甲基化在巨噬細胞活化中的作用及其部分機制研究
[Abstract]:The activation and secretion of inflammatory factors by macrophages is the main characteristic of inflammatory diseases such as arthritis, liver fibrosis and other inflammatory diseases, and inhibiting the activation of macrophages is the key link of anti-inflammatory and immunotherapy. SOCS1, an inhibitor of cytokine transduction, plays an important role in the inhibition of tissue injury and inflammatory diseases. SOCS1 inactivation is associated with hypermethylation of the promoter region in all types of tumors. In order to further study the mechanism of DNA methylation in the release of inflammatory cytokines from macrophages, we observed the changes of SOCS1 gene in murine peritoneal macrophages in vitro and its effect on the secretion of inflammatory cytokines by macrophages. Part of its mechanism is studied. The main contents of this study are as follows: the expression and methylation of 1.SOCS1 in RAW264.7 mouse peritoneal macrophages induced by LPS. RAW264.7 (mouse macrophage cell line) was selected as the study object. The activation was induced by LPS1 渭 g/ml for 24 h, the mRNA expression of SOCS1,TNF- 偽 and IL-6 was detected by RT-PCR method, and the expression of SOCS1 protein was detected by Western blot. Elisa method was used to detect the expression of TNF- 偽 and IL-6 in the supernatant of cell culture. The results showed that the expression of SOCS1 decreased during the secretion of inflammatory cytokines by macrophages. Methylation-specific PCR (MSP-PCR) was used to detect the status of SOCS1 methylation during the activation of macrophages in RAW264.7 mice induced by LPS. We found that the SOCS1 gene was hypermethylated. 2. SOCS1 induced demethylation and self-expression recovery under the action of DNA methylation inhibitor, which inhibited the secretion of inflammatory factors in RAW264.7 macrophages. RAW264.7 was used to induce activation for 24 h and 5-azadC2 渭 mol/l for 48 h. MRNA expression of SOCS1,TNF- 偽 and IL-6 was detected by RT-PCR method, SOCS1 protein was detected by Western blot. Elisa method was used to detect the expression of TNF- 偽 and IL-6 in the supernatant of cell culture. Methylation-specific PCR (MSP-PCR) was used to detect the methylation of SOCS1 gene in the peritoneal macrophages of RAW264.7 mice treated with LPS and 5-azadC. The results showed that 5-azadC could induce SOCS1 demethylation and restore the expression of SOCS1, and inhibit the secretion of TNF- 偽 and IL-6. 3. DNMT1 regulates the expression of SOCS1 and its effect on methylation. Small interfering RNA (small interfering RNA,siRNA was designed and synthesized according to the base sequence of DNMT1. The transfection efficiency of RAW264.7 cells was observed by using liposome LipofectamineTM2000. The transfection efficiency was observed by fluorescence inverted microscope. The expression of SOCS1,TNF- 偽 and IL-6mRNA was detected by RT-PCR. The expression of DNMT1,SOCS1 protein was detected by Western Blot. Elisa method was used to detect the expression of inflammatory factor TNF- 偽 and IL-6 in the supernatant of cell culture, and MSP-PCR was used to detect the methylation of SOCS1 after silencing DNMT1 gene. The results showed that silencing DNMT1 could promote the demethylation of SOCS1 and the expression of SOCS1, and then inhibit the secretion of TNF- 偽 and IL-6 in RAW264.7 induced by LPS, that is, DNMT1 mediated SOCS1 methylation to inhibit the secretion of inflammatory factors. 4. Effects of DNA methylation inhibitor and DNMT1 silencing on downstream signaling pathway of SOCS1. Western blot assay showed that the expression of p-JAK _ 2 and p-STAT3 was increased during the activation of murine peritoneal macrophages induced by LPS, and DNA methylation inhibitor and DNMT1 silencing could inhibit the expression of p-JAK _ 2 and p-STAT3. In addition, silencing SOCS1 in RAW264.7 blocking DNMT1 can attenuate the activation of JAK2/STAT3 by DNMT1. These results suggest that SOCS1 hypermethylation activates the downstream signaling pathway and promotes the secretion of inflammatory cytokines in macrophages.
【學位授予單位】:安徽醫(yī)科大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R96
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