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鹅胰岛素信号途径3个相关基因的克隆及葡萄糖和胰岛素对其表达的影响
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摘要
胰岛素受体底物PH域相互作用蛋白(Pleckstrin homology domain-interacting protein. PHIP)是能促进GLUT4的移位,介导细胞的凋亡、增殖,在胰岛素诱导的信号转导途径中扮演重要的角色。而胰岛素受体底物1 (insulin receptor substrate 1, IRS1)和TBC区域家族成员1 (TBC (Tre-2/Bub2/Cdc16) domain family, member 1, TBC1D1)是胰岛素信号途径的关键基因,可能在PHIP实现对胰岛素信号途径调控的作用中起作用。本试验以四川白鹅肝脏组织为材料,扩增鹅PHIP、IRS1、TBC1D1基因mRNA部分序列,采用RACE技术扩增PHIP mRNA全序列,并运用实时定量PCR技术检测不同浓度葡萄糖、胰岛素处理鹅原代肝细胞对PHIP、IRS1、TBC1D1基因表达的影响。研究结果如下:
     (1)克隆得到了四川白鹅IRS1和TBC1D1二个基因的部分编码区序列(Coding domain sequence, CDS),它们的大小分别为530bp和300bp。利用MEGA 5软件构建部分脊椎动物IRS1、TBC1D1基因的分子进化树发现,IRS1、TBC1D1基因的序列与火鸡、原鸡、斑胸草雀聚为一类。
     (2)利用RACE技术扩增并获得PHIP基因3条mRNA剪接体全序列,分别长5,525bp、5,080bp和4,677bp,命名为PHIP-a、PHIP-b和PHIP-c。通过生物信息学分析3条鹅PHIP mRNA剪接体剪接方式为选择性加尾。
     (3)鹅PHIP mRNA3种剪切体均编码相同蛋白质,由1295个氨基酸组成,蛋白相对分子量为147002.48Da,理论等电点pI=8.01。用NetPhos2.0软件预测发现有90个磷酸化位点,其中Ser位点60个,Thr位点18个,Tyr位点12个。用SMART在线软件分析发现有8个WD40区域,一个BROWO区域,5个Low complexity区域。
     (4)在低浓度的葡萄糖组(5 mmol/L), PHIP、IRS1、TBC1D1三个基因的表达有所上调,在高浓度的葡萄糖组(30 mmol/L), PHIP、IRS1、TBC1D1三个基因的表达显著增加(P<0.05);而低浓度的胰岛素诱导PHIP、IRS1、TBC1D1表达,当胰岛素浓度达到200 nmol/L时,PHIP、IRS1、TBC1D1的表达显著下降(P<0.05)。
     (5)葡萄糖和胰岛素的协同作用发现,低浓度(50 nmol/L)的胰岛素和5 mmol/L和30 mmol/L协同葡萄糖都能促进PHIP、IRS1、TBC1DI个基因的表达,而高浓度胰岛素(100 nmol/L)在低糖和高糖协同下,都能显著抑制3个基因的表达。
The pleckstrin homology domain-interacting protein (PHIP) plays important roles in insulin-mediated signal transduction pathways, promotiong GLUT4 translocation and mediating cell apoptosis and proliferation. However, the IRS1 and TBC1D1 play essential roles in insulin signal pathway, and therefore these two genes are important to the insulin mediating signal pathway transduction. In the present study, IRS1 and TBC1D1 partial mRNA sequence of goose were cloned. And the full-lenth of PHIP mRNA sequence of goose was cloned using RACE technical.Then the different concentration of glucose and insulin were added to the medium of geese primary hepatocytes cultured in vitro, to investigate their roles on mRNA expression of PHIP, IRS1 and TBC1D1 using Real-Time RT-PCR. The results were as follows:
     (1) The partial coding domain sequence (CDS) of IRS1, TBC1D1 genes were amplified by RT-PCR, and their length were 530bp and 300bp, respectively. The phylogenetic tree of IRS1 and TBCIDI gene in vertebrates were built using the MEGA 5.0 software, and results showed that the geese IRS1 and TBC1D1 gene have higher homology with that of Gallus, Turkey and Taenioygia guttata.
     (2) Three alternatively spliced forms of PHIP mRNA were found by RACE technical, and named them as PHIP-a, PHIP-b and PHIP-c, respectively. The full-lenth of total three PHIP mRNA sequeces was 5,525bp,5,080bp and 4,677bp, respectively. In silicon analysis showed that the splicing mode of all three PHIP mRNA sequences was the selective termination.
     (3) All the three splicing PHIP mRNA have the same CDS,encoding the same protein with 1295 amino acid. The relative molecular mass predicted is 147002.48Da, and the isoelectricpoint of PHIP protein was 8.01. PHIP amino acid sequence pocesses 90 phosphorylation-sites, including 60 Ser redidue,18 Thr redidue and 12 Tyr redidue. SMART online analysis suggested that PHIP protein possess eight WD40 domains, one browodomain and five low complexity domains.
     (4) Comparing with control group,5 mmol/L glucose (low concentration)had tiny effects on promoting PHIP, IRS1 and TBC1D1 expression. Within 30 mmol/L glucose, the expression of PHIP, IRS1 and TBC1D1 were significantly increased (P<0.05).Low concentration of insulin could promote expression of PHIP, IRS1 and TBC1D1, while high concentration of insulin (200 nmol/L) could significantly decrease their expressions (P<0.05).
     (5) When synergistic the effect of insulin and glucose, low concentration of insulin (50 nmol/L) with 5 mmol/L and 30 mmol/L glucose treatment could increase the expression of PHIP, IRS1 and TBC1D1. However, the high concentration of insulin (100 nmol/L) with both of the low and high concentrations of glucose could inhibit their expressions.
引文
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