JMJD3调控强直性脊柱炎Th17分化的表观遗传机制及清热利湿活血法干预作用
[Abstract]:BACKGROUND: Ankylosing Spondylitis (AS) is a chronic inflammatory autoimmune disease, which can cause hip joint destruction and spinal rigidity, seriously affect the working ability and self-care ability of patients, and reduce the quality of life of patients. Inflammation is the primary pathological change of AS. The helper T cell (Th17) is the trigger of A. The important effector cells of S inflammation are differentiated from the initial CD4 + T cells. Studies have shown that epigenetic regulation plays an important role in the differentiation of CD4 + T cells into Th17. Histone demethylase JMJD3 catalyzes the demethylation of H3K27 site and may be a key regulator of Th17 differentiation. They found that the method of clearing away heat and dampness and activating blood circulation has a satisfactory clinical effect on alleviating inflammation of AS. After treatment with the prescription of clearing away heat and removing dampness and activating blood circulation, the level of IL-17 expression, the number of Th17 and the expression of RORc, the activation level of JAK/STAT pathway were significantly decreased in AS patients, indicating that the method of clearing away heat and removing dampness and activating blood circulation could be exerted by interfering the differentiation of Th17. Objective: To investigate the expression of JMJD3 and the effect of demethylated H3K27 on the differentiation of Th17 in AS patients. Methods: Study 1, Study 2 and Study 3 were used to detect the expression of JMJD3 and the differentiation of Th17 in the serum and PBMC of AS patients in active phase. The expression of JMJD3 and Th17 mRNA were detected by Western Blotting, Quantitative Real-time PCR and serum inflammatory cytokines were detected by ELISA. Secretion of JMJD3, methylation of H3K27me3 and differentiation of Th17 in AS patients were detected at active stage, relatively stable stage, and three months after treatment with Chinese herbs. Objective:To study the effect of triptolide on the expression of JMJD3, the demethylation of H3K27 catalyzed by JMJD3 and the differentiation of Th17 in AS patients in vitro. Results:1. The expression of Th17 in AS patients in active phase was detected by the analysis of JMJD3 expression. The expression of cytokine IL-17 in heterosexual secretion was significantly higher than that in normal control group (p0.001), and the difference was statistically significant (p0.001); the correlation analysis with inflammatory markers ESR, CRP and disease activity index BASDAI showed that IL-17, ESR and CRP were highly correlated (IL-17-ESR: p0.001; IL-17-CRP: p0.01). The expression of JMJD3 mRNA was significantly higher than that of normal controls (p0.001); JMJD3 was significantly correlated with inflammatory markers ESR and CRP (ESR: r = 0.631, P = 0.0030.01) (CRP: r = 0.567, P = 0.0090.01). JMJD3 was significantly correlated with inflammatory cytokine IL-17 (IL-17: p0.01), but JMJD3, IL-17 were not significantly correlated with BASDAI.2. The expression of JMJD3, H3K27me3, JAK/STAT signaling pathway and characteristic transcription factor RORc protein and mRNA in AS patients (AS-Active), AS-Stable patients (AS-Stable), normal control group (N), and active AS patients were detected. The expression level of JMJD3 mRNA in active AS patients was significantly higher than that in non-active AS patients and normal AS patients (p 0.001), but not in active AS patients (p 0.05). There were significant differences in the expression of JMJD3 mRNA between active and inactive AS patients (p0.001). The methylation level of H3K27me3 in active AS patients was significantly lower than that in normal control group (p0.01). The methylation level of H3K27 in active AS patients and inactive AS patients was also significantly lower than that in normal control group (p0.01). The phosphorylation level of STAT3 in JAK / STAT signaling pathway (pSTAT3 / STAT3) was significantly higher than that in normal controls (AS-Active: p0.001; AS-Stable: p0.01). Compared with non-active patients, the expression level of JAK2 in active AS patients was not significantly different. However, the expression of phosphorylated JAK2 was significantly increased (p=0.0130.05), and the expression of STAT3 protein and phosphorylation were significantly higher than those of inactive AS patients (STAT3:p0.01; pSTAT3:p0.001). At the gene level, the expression of JAK2 and STAT3 mRNA in active AS patients and inactive AS patients were significantly higher than those of normal control group (AS-Active:p0.01). The expression level of RORc in active AS patients and inactive AS patients was significantly higher than that in normal control group (p0.001), while the expression level of RORc in active AS patients was significantly higher than that in inactive AS patients (p0.001). The expression of RORc mRNA was significantly higher in active AS patients and inactive AS patients than in normal control group (p0.01). The expression of JMJD3 and Th17 was also significantly different in active AS patients and inactive AS patients (p0.01). 3. The regulation of heat-clearing, dampness-activating and Blood-Activating Therapy on on JMJD3 expression and Th17 differentiation in active AS patients. In the study of action, we chose Qingre Qiangji Decoction, a clinical effective prescription for active bone arthralgia, to treat AS patients with dampness-heat-stasis syndrome, and detected the activity and function of Th17 cells 3 months after taking the medicine. After treatment, the levels of serum inflammatory cytokine IL-17 were also significantly lower than before treatment (p0.05); JMJD3 protein and mRNA expression and relative gray value changes were significantly different than before treatment (p0.05); H3K27me3 methylation levels in patients were also significantly lower than before treatment (p0.001); The expression of JMJD3 protein in active AS patients treated with triptolide was significantly lower than that before treatment (p0.001). The same result was obtained by gene level detection (p0.001). Dry triptolide was used to treat active AS patients with PBMC. Prognosis, H3K27 methylation level was significantly higher than before treatment, the difference was statistically significant (p0.001); Tripterygium wilfordii intervention H3K27me3 level and normal control group, there was no significant difference (p = 0.080.05). After triptolide intervention, JAK2 / STAT3 signal pathway activation was significantly inhibited, each signal molecule phosphorylated water. At the gene level, JAK2 and STAT3 mRNA expression decreased significantly (p0.001). After triptolide intervention, RORc protein and mRNA expression decreased significantly (p0.001). Conclusion: 1. JMJD3 is an important regulator of Th17 differentiation and function, and participates in the inflammation of active AS. JMJD3 is also closely related to the inflammation index of AS, and may be one of the therapeutic targets for controlling inflammation of AS. 2. There is a high expression of JMJD3 and a decrease of H3K27me3 methylation in AS patients. There are differences in RORc expression, JAK/STAT signaling pathway activation and IL-17 secretion in patients with active disease. H3K27me3 demethylation regulated by JMJD3 may interfere with the differentiation, activation and function of Th17, thus affecting the inflammation and disease activity of AS. 3. Clearing away heat, eliminating dampness and activating blood circulation method has a better effect on inflammatory indexes and disease activity of patients. Controlling effect can interfere with the expression of JMJD3 and the demethylation activity of H3K27me3 catalyzed by JMJD3, thus affecting the Th17 differentiation of epigenetic regulation, reducing the expression of RORc and the activation of JAK/STAT signaling pathway, thus interfering with the activation of Th17 and the expression of IL-17. Mitigation may be achieved by interfering with the activation and function of JMJD, thereby inhibiting the differentiation, activation and function of Th17. 4. Tripterygium Wilfordii in vitro can reduce the expression of JMJD3 in PBMC of AS patients, and affect the H3K27me3 demethylation process regulated by JMJD3, thus making Th17 transcription factor RORc, JAK/STAT signaling pathway. Inhibition of transcriptional and protein expression of IL-17 and IL-17 may be one of the significant therapeutic drugs to alleviate AS inflammation by regulating the differentiation and function of Th17.
【学位授予单位】:中国中医科学院
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:R259
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