GH早期干預對SGA大鼠糖代謝影響及胰島Pdx1基因表達調(diào)控機制研究
[Abstract]:The results of many epidemiological studies and clinical trials in recent years suggest that less than gestational age (SGA) caused by intrauterine environmental change is closely related to postadult metabolic syndrome (MS) and type 2 diabetes mellitus (T2DM). How SGA results in the pathogenesis of adult metabolic diseases is not clear, and islet dysfunction is an important link, which may be closely related to the expression of islet-related transcription factors. Pancreaticoduodenal homeobox 1 (Pdx1) is an important transcription factor in the development of pancreatic orientation, which can inhibit the apoptosis of pancreatic islet cells and promote the differentiation and proliferation of pancreatic islet cells. At the same time, the expression of the insulin gene is mediated by binding the transcription factor binding site of the promoter and the enhancer region of the insulin gene at the transcription level, so as to determine the main regulating gene of the pancreatic differentiation and the islet function, It is very important to investigate the pathogenesis of pancreatic islet dysfunction in SGA. Some SGA children can't achieve growth chase, and growth hormone (GH) therapy is needed. GH has the function of keeping the number of islet p cells, stimulating insulin synthesis and secretion, participating in and maintaining normal insulin sensitivity and blood glucose homeostasis. GH treatment is an important clinical problem for the metabolism of SGA children, and the clinical study of GH intervention on the metabolism of SGA is currently seen, but the mechanism of GH on the function of islet function is discussed. Objective To study the effect of early GH intervention on blood glucose metabolism in adult rats of SGA rats, and to explore the expression of Paxl genomic proteins in islet p cells of SGA rats with GH intervention by the group members of methyltransferase family Set7/ 9 and histones. Process. The study method adopts the full-course starvation method of pregnant mice to establish SG A rat model was randomly divided into GH group or normal saline (NS) control group on the 21st day after birth; it was randomly divided into GH intervention group or NS control group for gestational age (AGA). At the 35th day of the day, the NS control group was injected simultaneously The levels of fasting serum insulin, serum IGF-1 and IGFBP-3 were measured at 0, 21, 35 and 70 days respectively, and the levels of serum insulin, serum IGF-1 and IGFBP-3 in serum were measured at 0, 21, 35 and 70 days. Protein levels, levels of Set7/ 9 protein in pancreatic islets on Days 21, 35, 70 and HDA The results showed that the weight of SGA rats was higher than that of AGA rats at 21 days after the study, and the fasting blood glucose was higher than that in AGA rats at 21 days. At the end of GH treatment at 35 days, the weight and growth of SGA + GH group after GH treatment did not catch up with AGA control group. There was no significant difference in glucose tolerance test in group (P0.05). However, the fasting insulin level in SGA + NS group was lower than that of AGA + NS group (P0.05). Compared with AGA + NS group, SGA + GH group had no significant difference in glucose tolerance test (P0.05). The fasting blood glucose in SGA + NS group was not increased, but the glucose tolerance test was 30 min, and the blood sugar increased in 60 min. Compared with AGA + NS group, there was significant difference (P <0.05). GH intervention could improve the expression of Pdx1mRNA and protein content in SGA rats. The action lasted to adulthood. The HDAC activity was significantly higher in the SGA group than in the AGA group before the 21-day GH intervention. At the end of the 35-day intervention, the HDAC activity of SGA + GH group decreased (P0.05), and the level of SET7/ 9 protein in SGA group was significantly lower than that of AGA group (P0.05). There was a significant difference in protein content (P <0.05) compared with that of SGA + NS group (P0.05). Conclusion GH early intervention was beneficial to the regulation of blood glucose in SGA rats, and the expression of Paxl in the insulin transcription factor of SGA rats was increased.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R725.8
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