尘螨抗原对支气管上皮细胞单核细胞趋化蛋白-1表达的影响

目的探讨屋尘螨（Dermatophagoides pteronyssinus，Derp）抗原对支气管上皮细胞单核细胞趋化蛋白-1（MCP-1）表达的影响。方法使支气管上皮细胞BEAS-2B暴露于系列不同浓度（0．02、0．2．2、20μg／ml）的Derp抗原24h至96h，分别观察各时间点细胞的表现，然后用酶联免疫法（ELISA）检测其细胞上清MCP-1的浓度表达。结果正常为未加Derp抗原。表现为单层细胞完全平铺；实验各组在抗原的刺激下，表现为随着浓度和时间的增加，细胞逐渐变瘦长，细胞间距逐渐增大；在无抗原刺激因素培养条件下的对照组，MCP-1释放水平很低，而在加入Derp抗原组，引起细胞分泌MCP-1蛋白水平的显著增加，并随着时间和浓度增加，MCP-1蛋白的表达水平呈上升趋势，特别是在高浓度组，即20μg／ml抗原组，各时间点MCP-1的表达差异均有统计学意义（P〈0．01）。结论Derp抗原刺激气道上皮细胞，引起支气管上皮损伤和脱落等气道炎症反应，激发单核巨噬细胞产生大量的MCP-1，促成和加重气道炎症反应，因此认为MCP-1可能参与哮喘疾病的某些过程。     

屋尘螨致敏组分的研究

目的研究屋尘螨(Dermatophagoides pteronyssinus)引起中国人群过敏的特异性变应原组分,为我国屋尘螨变应原的标准化提供依据。方法采用常规方法制备屋尘螨粗浸液,以48例螨过敏病人血清为探针进行Westen blot检测粗浸液中的致敏组分,并利用BandScan5.0软件分析血清阳性反应带(致敏带)结合特异性IgE的相对含量。结果免疫印迹杂交检测到屋尘螨的10条致敏带,相对分子质量(Mr)依次为103、99、68、62、57、37、33、29、25、15×103,其中致敏带1、2、4、5、6、7、8的阳性反应率超过95%;致敏带10的阳性反应率为47.9%,其结合特异性IgE的能力最强。结论屋尘螨的主要致敏组分既包括小Mr的变应原,也包括大Mr的变应原,现有的屋尘螨变应原的国际标准品不能普遍应用于中国人群,必须开发适合我国人群的尘螨变应原疫苗,本研究为开发适合我国人群的尘螨标准化疫苗提供理论依据。     

粉尘螨变应原第10组分基因克隆表达及生物信息学分析

目的:克隆粉尘螨变应原第10组分(Der f 10)基因并建立其原核表达体系。方法:提取粉尘螨总RNA,反转录后经套式PCR扩增出目的基因并克隆至pMD19-T载体测序,将测序正确的目的基因插入表达质粒pET28a,转化E.coliBL21(DE3)用IPTG诱导表达,用SDS-PAGE和Western blot鉴定重组蛋白。结果:RT-PCR扩增获得Der f 10,琼脂糖凝胶电泳见一条约888 bp的条带,与参考序列(GenBank No.EU 106617)同源性高达99.8%。将pET28a(+)-Der f 10质粒转化宿主菌E.coli BL21,SDS-PAGE电泳时出现特异性条带,Western blot表明重组蛋白可与抗His-Tag Mab抗体结合。生物信息学软件预测获得的Der f 10重组体由295个氨基酸组成的疏水性蛋白,相对分子质量为34 233.1 Da,二级结构包括α-螺旋(91.86%)、延伸主链(1.36%)和无规卷曲(6.78%),含有5个原肌球蛋白模序分别位于84～101、120～140、145～173、175～198和231～256氨基酸处。结论:获得了Der f 10编码基因,成功建立其原核表达体系,为生产重组变应原用于临床诊断与治疗奠定基础。     

Allergen immunotherapy for atopic dermatitis: Systematic review and meta-analysis of benefits and harms

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Effect of birth season on allergic rhinitis and cedar pollinosis considering allergen and vitamin D exposure: The Japan Environment and Children's study (JECS)

BackgroundThe relationship between the season of birth, allergen sensitization, and allergic rhinitis have been inconsistent, and there are no studies that simultaneously consider vitamin D and allergen exposure. This study aimed to determine the associations between the season of birth, house dust mite (HDM) and Japanese cedar pollen (JCP) sensitization, and allergic rhinitis and pollinosis, while taking vitamin D levels and allergen exposure into account.MethodsThis study included 4323 participants in the Sub-Cohort Study of the Japan Environment and Children's Study. A logistic regression model was used to analyze the association between the season of birth and sensitization to JCP or HDM (judged by specific immunoglobulin E) at age 2 and allergic rhinitis or pollinosis at age 3, adjusted for HDM or JCP exposure and vitamin D levels with potential confounders.ResultsParticipants born in spring or summer were more likely to have pollinosis than were those born in winter (adjusted odds ratio [aOR]: 2.08, 95% confidence interval [CI]: 1.13–3.82 for spring; aOR: 1.89, 95% CI: 1.03–3.47 for summer). Participants born in summer were more likely to have HDM sensitization than were those born in winter (Der p 1, aOR: 1.53, 95% CI: 1.10–2.15; Der f 1, aOR: 1.44, 95% CI: 1.03–2.01). Exposure to JCP and HDM were associated with pollinosis and HDM sensitization, respectively.ConclusionsSpring and summer births were associated with the development of pollinosis, and summer birth was associated with HDM sensitization, even when vitamin D and allergen exposure were considered. Further studies on mechanisms other than vitamin D and allergen exposure are required.