许多过敏原可以介导Ⅰ型超敏反应,通过与IgE特异性结合,引起过敏症状.过敏原与细胞表面的特异性IgE结合的部分叫做表位,其与IgE的结合能力可以表征过敏原致敏性的强弱.Der p 2是一种重要的屋尘螨过敏原,其线性表位中含有的酪氨酸可被空...许多过敏原可以介导Ⅰ型超敏反应,通过与IgE特异性结合,引起过敏症状.过敏原与细胞表面的特异性IgE结合的部分叫做表位,其与IgE的结合能力可以表征过敏原致敏性的强弱.Der p 2是一种重要的屋尘螨过敏原,其线性表位中含有的酪氨酸可被空气中的NO_(2)和O_(3)硝基化,从而影响线性表位与IgE的结合能力.本实验研究了Der p 2的线性表位及其硝基化产物与IgE的结合能力.研究发现,Der p 2的两条表位多肽可以有效地结合IgE,硝基化表位多肽的IgE结合能力显著高于未硝基化的表位多肽,且不同位点的硝基化对于IgE结合能力的增强程度也不同.结果表明,硝基化能够位点特异性地增强Der p 2的致敏性.展开更多
Surface sediments and bivalves were collected from the Changjiang Estuary in December 2003 and November 2004, respectively. Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in these samples were mea...Surface sediments and bivalves were collected from the Changjiang Estuary in December 2003 and November 2004, respectively. Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in these samples were measured with high-resolution chromatography (HRGC)/High Resolution Mass Spectrometer (HRMS). The concentrations of total PCDD/Fs and toxic equivalent (TEQ) were 169.83±119.63 and 0.81±0.36 pg/g dry weight (dw) in sediments, and 580.33±240.17 and 7.24±3.65 pg/g dw in bivalves. The homolog compositions of PCDD/Fs were similar among samples, the most abundant congener was octa-chlorinated dibenzo-p-dioxin (OCDD) and then octa-chlorinated dibenzofuran (OCDF) and 1,2,3,4,6,7,8-hepta-chlorinated dibenzo-p-dioxin (HpCDD). The herbicide pentachlorophenol (PCP) and sodium pentachlorophenol (Na-PCP) were proved the main source of PCDD/Fs in this area.展开更多
过敏原的硝基化会引起其致敏潜能的增强,进而带来更大的致敏性健康风险.过敏原蛋白质通常含有多个酪氨酸硝基化位点,分析过敏原硝基化的位点选择性是探究硝基化对过敏原致敏性影响的重要基础.本文以尘螨过敏原为研究对象,建立了基于超...过敏原的硝基化会引起其致敏潜能的增强,进而带来更大的致敏性健康风险.过敏原蛋白质通常含有多个酪氨酸硝基化位点,分析过敏原硝基化的位点选择性是探究硝基化对过敏原致敏性影响的重要基础.本文以尘螨过敏原为研究对象,建立了基于超高效液相色谱-串联质谱(UPLC-MS/MS)同时定量分析3种尘螨过敏原(Der f 1、Der p 1和Der p 2)的13个酪氨酸位点硝基化程度的方法,并应用于分析3种尘螨过敏原在过氧亚硝酸盐硝基化作用下的位点选择性.结果表明,3种尘螨过敏原均发生了位点特异性的硝基化,Y195、Y37和Y92分别为Der f 1、Der p 1和Der p 2中反应活性最高的硝基化位点.尘螨过敏原位点选择性的硝基化表明,在评价硝基化尘螨过敏原的致敏性变化时应当考虑其位点特异性的硝基化状况.展开更多
文摘许多过敏原可以介导Ⅰ型超敏反应,通过与IgE特异性结合,引起过敏症状.过敏原与细胞表面的特异性IgE结合的部分叫做表位,其与IgE的结合能力可以表征过敏原致敏性的强弱.Der p 2是一种重要的屋尘螨过敏原,其线性表位中含有的酪氨酸可被空气中的NO_(2)和O_(3)硝基化,从而影响线性表位与IgE的结合能力.本实验研究了Der p 2的线性表位及其硝基化产物与IgE的结合能力.研究发现,Der p 2的两条表位多肽可以有效地结合IgE,硝基化表位多肽的IgE结合能力显著高于未硝基化的表位多肽,且不同位点的硝基化对于IgE结合能力的增强程度也不同.结果表明,硝基化能够位点特异性地增强Der p 2的致敏性.
基金supported by National Research Program (No. 2003CB415005)"Youth Chen-Guang Project" of Wuhan Bureau of Science and Technology (No. 200750731259).
文摘Surface sediments and bivalves were collected from the Changjiang Estuary in December 2003 and November 2004, respectively. Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in these samples were measured with high-resolution chromatography (HRGC)/High Resolution Mass Spectrometer (HRMS). The concentrations of total PCDD/Fs and toxic equivalent (TEQ) were 169.83±119.63 and 0.81±0.36 pg/g dry weight (dw) in sediments, and 580.33±240.17 and 7.24±3.65 pg/g dw in bivalves. The homolog compositions of PCDD/Fs were similar among samples, the most abundant congener was octa-chlorinated dibenzo-p-dioxin (OCDD) and then octa-chlorinated dibenzofuran (OCDF) and 1,2,3,4,6,7,8-hepta-chlorinated dibenzo-p-dioxin (HpCDD). The herbicide pentachlorophenol (PCP) and sodium pentachlorophenol (Na-PCP) were proved the main source of PCDD/Fs in this area.
文摘过敏原的硝基化会引起其致敏潜能的增强,进而带来更大的致敏性健康风险.过敏原蛋白质通常含有多个酪氨酸硝基化位点,分析过敏原硝基化的位点选择性是探究硝基化对过敏原致敏性影响的重要基础.本文以尘螨过敏原为研究对象,建立了基于超高效液相色谱-串联质谱(UPLC-MS/MS)同时定量分析3种尘螨过敏原(Der f 1、Der p 1和Der p 2)的13个酪氨酸位点硝基化程度的方法,并应用于分析3种尘螨过敏原在过氧亚硝酸盐硝基化作用下的位点选择性.结果表明,3种尘螨过敏原均发生了位点特异性的硝基化,Y195、Y37和Y92分别为Der f 1、Der p 1和Der p 2中反应活性最高的硝基化位点.尘螨过敏原位点选择性的硝基化表明,在评价硝基化尘螨过敏原的致敏性变化时应当考虑其位点特异性的硝基化状况.
