海南变态反应性疾病患儿对屋尘螨/粉尘螨和仓储螨的特异性IgE

目的探讨海南变态反应性疾病患儿对尘螨和仓储螨的特异性IgE水平。方法对海南变态反应性疾病患儿进行13种常见变应原皮肤点刺和7种螨的体外特异性IgE检测。结果 121例患儿中对屋尘螨和粉尘螨的皮肤点刺阳性率为100%,而对热带无爪螨的阳性率为85.8%。7种螨的体外特异性IgE依次为屋尘螨99.2%、粉尘螨95.0%、热带无爪螨87.6%、家嗜甜螨79.7%、害嗜鳞螨67.8%、腐食酪螨59.5%和粗脚粉螨52.9%。对仓储螨过敏的患儿同时都对屋尘螨和热带无爪螨过敏,并且IgE水平更高。除热带无爪螨外,其他仓储螨的特异性IgE有很好的相关性。结论除屋尘螨和粉尘螨外,热带无爪螨也是海南地区的重要致敏原,其他仓储螨亦有可能引起慢性变态反应性疾病。

屋尘螨和粉尘螨主要变应原的序列多态性分析

目的探讨不同地域间屋尘螨和粉尘螨主要变应原变异体的差异。方法分别提取中国华南地区培养的粉尘螨和欧洲商业化培养的屋尘螨和粉尘螨的螨体、螨卵和全螨培养物总RNA,采用RT-PCR技术扩增第1组变应原的包含前导肽段、酶原肽段和成熟肽段,以及第2组变应原的包含前导肽段和成熟肽段的目的片段,根据国际标准参照物进行序列比较。结果欧洲商业化的屋尘螨Derp1主要变异体是Derp1.0105,除了第124V、50Y和19M位氨基酸有频繁的置换外,其余为散在的置换,出现8种新的变异体;Derp2主要变异体是Derp2.0104,置换集中在第40V、4T7、111M和114D位,出现6种新的变异体。中国华南地区的粉尘螨Derf1变异体很少,出现3种新的变异体;与欧洲商业化的粉尘螨相比,中国华南地区有不同的Derf2变异体,出现6种新的变异体。来自螨体、螨卵和全螨培养物的各主要变应原变异体无明显差异。结论不同地域间尘螨的主要变异体不同。

桦树花粉、大豆和苹果过敏原之间高免疫球蛋白E相关性表明中国北方地区桦树花粉过敏患者很可能同时患有花粉–食物综合征（英文）

目的:研究中国北方地区桦树花粉过敏及花粉–食物过敏综合征。创新点:国内首次研究花粉–食物过敏综合征,为中国北方地区此类患者的诊断和治疗提出了新思路。方法:采集临床中过敏患者血清,检测桦树花粉及其主要过敏原特异性免疫球蛋白E(IgE),同时检测大豆和苹果过敏原的特异性IgE,并评价其相关性。结论:中国北方地区桦树花粉季节对此花粉过敏的患者有16.7%以上,主要是对桦树花粉第一组过敏原致敏。这些患者大多数同时对大豆和苹果的主要过敏原过敏,这种特异性IgE高相关性说明临床上存在花粉–食物过敏综合征。

Prevalence of sensitization to weed pollens of Humulus scandens,Artemisia vulgaris,and Ambrosia artemisiifolia in northern China

Objective:Weed pollens are common sources of allergens worldwide.The prevalence of weed pollen sensitization is not yet fully known in China.The purpose of this study was to investigate the prevalence of sensitization to weed allergens from Artemisia,Ambrosia,and Humulus in northern China.Methods:A total of 1144 subjects(aged from 5 to 68 years) visiting our clinic from June to October 2011 underwent intradermal testing using a panel of 25 allergen sources.Subjects with positive skin responses to any pollen were further tested for their serum concentrations of IgE antibodies against Artemisia vulgaris,Ambrosia artemisiifolia,and Humulus scandens,and against the purified allergens,Art v 1 and Amb a 1.Results:Of 1144 subjects,170 had positive intradermal reactions to pollen and 144 donated serum for IgE testing.The prevalence of positive intradermal responses to pollens of Artemisia sieversiana,Artemisia annua,A.artemisiifolia,and H.scandens was 11.0%,10.2%,3.7%,and 6.6%,respectively.Among the intradermal positive subjects,the prevalence of specific IgE antigens to A.vulgaris was 58.3%,to A.artemisiifolia 14.7%,and to H.scandens 41.0%.The prevalence of specific IgE antigens to the allergen Art v 1 was 46.9%,and to Amb a 1 was 11.2%.The correlation between the presence of IgE antibodies specific to A.vulgaris and to the Art v 1 antigen was very high.Subjects with A.artemisiifolia specific IgE also had A.vulgaris specific IgE,but with relatively high levels of A.vulgaris IgE antibodies.There were no correlations between the presence of IgE antibodies to H.scandens and A.vulgaris or to H.scandens and A.artemisiifolia.Conclusions:The intradermal prevalence of weed pollen sensitization among allergic subjects in northern China is about 13.5%.Correlations of specific IgE antibodies suggest that pollen allergens from Artemisia and Humulus are independent sources for primary sensitization.