[Objective] Using molecular biotechnology to clone the sus scrofa GPX2 gene. [Method] Using total RNA of sus scrofa duodenum as template, degenerated primer pairs were designed according to the homology alignment anal...[Objective] Using molecular biotechnology to clone the sus scrofa GPX2 gene. [Method] Using total RNA of sus scrofa duodenum as template, degenerated primer pairs were designed according to the homology alignment analysis of GPX2 gene of human, rat, mouse, dog and cattle. A sus scrofa GPX2 gene sequence of 330 bp was obtained by RT-PCR application method. Primes were designed respectively according to the known sequence, sus scrofa GPX2 gene was isolated and cloned by 3-RACE and 5-RACE method and analyzed the gene sequence. [Result] A mRNA sequence of 924 bp was successfully cloned and isolated in this research. This sequence contained complete 3＇end and had higher sequence homology with human,mouse,cattle and dog GPX2 gene, and there was codon called TGA which encoding Sec on the position of No. 114-116 gene. [Conclusion] Sequence alignment analysis showed that the cloned gene was sus scrofa GPX2 gene （ NCBI GenBank database, the sequence number was D098982）.展开更多
GPX-GI is a cytosolic tetrameric Se-dependent glutathione peroxidase, similar in properties to GPX-1. Unlike the almost ubiquitous GPX-1, GPX-GI is mainly expressed in the epithelium of gastrointestinal tract. GPX-GI ...GPX-GI is a cytosolic tetrameric Se-dependent glutathione peroxidase, similar in properties to GPX-1. Unlike the almost ubiquitous GPX-1, GPX-GI is mainly expressed in the epithelium of gastrointestinal tract. GPX-GI contributes to at least fifty percent of GPX activity in rodent small intestmal epithelium. The total GPX activity consists of at least 70% of selenium-dependent GPX activity in this compartment.By analyzing a panel of mouse mterspecies DNA from the Jackson Laboratory's backcross resource,we mapped Gpx2 gene to mouse chromosome 12 between D12Mit4 and D12Mit5, near the Ccs1 locus which contains a colon cancer susceptibility gene. A pseudogene, Gpx2-ps is mapped to mouse chromosome 7.Comparison of Gpx2 gene expression in three pairs of C57BL/6Ha and ICR/Ha mice which are respectively resistant and sensitive to dimethylhydrazine-induced colon cancer, we found a higher Gpx2 mRNA level in C57BL/6Ha colon than ICR/Ha colon. Interestingly, a lower level of GPX activity is found in the resistant strain of mice. Because GPX-1 has three times higher specific activity than GPX GI, our data suggest that the decreased GPX activity may result from a higher level of Gpx2 gene expression in those cells co-express GPx1 gene展开更多
文摘[Objective] Using molecular biotechnology to clone the sus scrofa GPX2 gene. [Method] Using total RNA of sus scrofa duodenum as template, degenerated primer pairs were designed according to the homology alignment analysis of GPX2 gene of human, rat, mouse, dog and cattle. A sus scrofa GPX2 gene sequence of 330 bp was obtained by RT-PCR application method. Primes were designed respectively according to the known sequence, sus scrofa GPX2 gene was isolated and cloned by 3-RACE and 5-RACE method and analyzed the gene sequence. [Result] A mRNA sequence of 924 bp was successfully cloned and isolated in this research. This sequence contained complete 3＇end and had higher sequence homology with human,mouse,cattle and dog GPX2 gene, and there was codon called TGA which encoding Sec on the position of No. 114-116 gene. [Conclusion] Sequence alignment analysis showed that the cloned gene was sus scrofa GPX2 gene （ NCBI GenBank database, the sequence number was D098982）.
文摘GPX-GI is a cytosolic tetrameric Se-dependent glutathione peroxidase, similar in properties to GPX-1. Unlike the almost ubiquitous GPX-1, GPX-GI is mainly expressed in the epithelium of gastrointestinal tract. GPX-GI contributes to at least fifty percent of GPX activity in rodent small intestmal epithelium. The total GPX activity consists of at least 70% of selenium-dependent GPX activity in this compartment.By analyzing a panel of mouse mterspecies DNA from the Jackson Laboratory's backcross resource,we mapped Gpx2 gene to mouse chromosome 12 between D12Mit4 and D12Mit5, near the Ccs1 locus which contains a colon cancer susceptibility gene. A pseudogene, Gpx2-ps is mapped to mouse chromosome 7.Comparison of Gpx2 gene expression in three pairs of C57BL/6Ha and ICR/Ha mice which are respectively resistant and sensitive to dimethylhydrazine-induced colon cancer, we found a higher Gpx2 mRNA level in C57BL/6Ha colon than ICR/Ha colon. Interestingly, a lower level of GPX activity is found in the resistant strain of mice. Because GPX-1 has three times higher specific activity than GPX GI, our data suggest that the decreased GPX activity may result from a higher level of Gpx2 gene expression in those cells co-express GPx1 gene
文摘目的探究枸杞多糖(Lycium barbarum polysaccharides,LBP)调控核因子E2相关因子2(nuclear factor E2 related factor 2,Nrf2)/谷胱甘肽过氧化物酶4(glutathione peroxidase 4,GPX4)通路对缺氧/复氧(hypoxia/reoxygenation,H/R)诱导的心肌细胞铁死亡的影响。方法设置对照组、模型组及LBP低、中、高剂量(25、50、100 mg/L)组和LBP(100mg/L)+Nrf2抑制剂ML385(5μmol/L)组。构建H9c2细胞H/R模型,并给予相应药物处理。采用CCK-8检测细胞活力;采用TUNEL染色检测细胞凋亡;采用试剂盒检测细胞Fe^(2+)、谷胱甘肽(glutathione,GSH)、丙二醛(malondialdehyde,MDA)水平及乳酸脱氢酶(lactate dehydrogenase,LDH)、超氧化物歧化酶(superoxide dismutase,SOD)、过氧化氢酶(catalase,CAT)活性;采用二氢乙锭(dihydroethidium,DHE)荧光探针检测细胞活性氧(reactive oxygen species,ROS)水平;采用透射电镜观察细胞线粒体形态;采用Western blotting检测转铁蛋白受体1(transferrin receptor 1,Tf R1)、二价金属离子转运蛋白1(divalent metal transporter 1,DMT1)、铁蛋白重链1(ferritin heavy chain 1,FTH1)、酰基辅酶A合成酶长链家族成员4(acyl-CoA synthetase long-chain family member 4,ACSL4)、Kelch样ECH相关蛋白1(Kelch like ECH associated protein1,Keap1)、Nrf2、血红素氧合酶-1(heme oxygenase-1,HO-1)、溶质载体家族7成员11(solute carrier family 7 member 11,SLC7A11)、GPX4蛋白表达。结果与对照组比较,模型组细胞活力显著降低(P<0.001),Fe^(2+)、MDA、ROS水平和LDH活性显著升高(P<0.001),GSH水平和SOD、CAT活性显著降低(P<0.001),线粒体缩短、膜密度增高且嵴数量减少,TfR1、Nrf2、HO-1、SLC7A11、GPX4蛋白表达水平显著降低(P<0.001),DMT1、FTH1、ACSL4、Keap1蛋白表达水平显著升高(P<0.001)。与模型组比较,LBP组细胞活力显著升高(P<0.01),Fe^(2+)、MDA、ROS水平和LDH活性显著降低(P<0.05、0.01、0.001),GSH水平和SOD、CAT活性显著升高(P<0.05、0.01、0.001),线粒体形态较为规则,TfR1、Nrf2、HO-1、SLC7A11、GPX4蛋白表达水平显著升高(P<0.01、0.001),DMT1、FTH1、ACSL4、Keap1蛋白表达水平显著降低(P<0.05、0.01、0.001);而ML385能够抑制枸杞多糖对细胞铁死亡的改善作用(P<0.05、0.01、0.001)。结论枸杞多糖可能通过激活Nrf2/GPX4通路改善H/R诱导的心肌细胞铁死亡。
