胰岛素受体底物在宫内发育迟缓大鼠胰腺组织中的表达

Expression of insulin receptor substrates in pancreas of rats with intrauterine growth retardation

摘要:

目的：研究胰岛素受体底物1（IRS-1）和胰岛素受体底物2(IRS-2)在宫内发育迟缓（IUGR）大鼠生后0周、3周和8周胰腺组织中的表达，探讨IUGR个体易患代谢综合征的分子机制。方法：采用母孕期低蛋白饮食法建立IUGR大鼠模型，应用RT-PCR技术检测子鼠在生后0周、3周、8周胰腺组织中IRS-1和IRS-2 mRNA水平。采用Western 杂交检测 IRS-1和IRS-2蛋白的表达。母孕期得到正常饮食的子鼠作为对照组。结果：IUGR 组0周、3周、8周胰腺组织IRS-2 mRNA和蛋白表达水平均显著低于对照组(P<0.05），IRS-1 mRNA 和蛋白表达水平与对照组相比差异无统计学意义（P＞0.05）。结论：IUGR子鼠生后0周、3周和8周胰腺组织中IRS-2 mRNA和蛋白水平显著下降，可能是 IUGR 个体易患代谢综合征的分子机制之一。［中国当代儿科杂志，2010，12(12)：972-975］

Abstract:

OBJECTIVE: To study the expression of insulin receptor substrate-1(IRS-1) and insulin receptor substrate-2 (IRS-2) in pancreas of rats with intrauterine growth retardation (IUGR). METHODS: An IUGR rat model was prepared by protein malnutrition during pregnancy. The pancreas samples of the IUGR pups were obtained at birth, and 3 weeks and 8 weeks of age. The expression of IRS-1 and IRS-2 mRNA were ascertained by RT-PCR. Western blot was used to measure the protein expression of IRS-1 and IRS-2. The rat pups born from the mother rats who received normal diet during pregnancy severed as the control group. RESULTS: The expression levels of IRS-2 mRNA and protein in pancreas of the IUGR group were significantly lower than those in the control group at all three time points (P<0.05). There were no significant differences in the expression levels of IRS-1 mRNA and protein in pancreas between the IUGR and the control groups. CONCLUSIONS: The IRS-2 expression levels in pancreas in IUGR rats decrease significantly at birth, and 3 weeks and 8 weeks of age. This might be one of the molecular mechanisms for the development of metabolic syndrome in later life in IUGR individuals.［Chin J Contemp Pediatr, 2010, 12 (12):972-975］