Total protein concentration and stability of Amb a 1 in glycerinated ragweed sublingual immunotherapy stored at room temperature and refrigerated cold temperature.
{"title":"Total protein concentration and stability of Amb a 1 in glycerinated ragweed sublingual immunotherapy stored at room temperature and refrigerated cold temperature.","authors":"Tyler Charbonneau, Levi Lowder, Glenna Mauldin, Brennan McKinney, Rebecca Mount, Anthea Schick","doi":"10.1111/vde.13310","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Few studies have investigated optimal storage conditions or expiration dates for sublingual immunotherapy (SLIT) formulations prepared from glycerinated allergen extracts.</p><p><strong>Hypothesis/objectives: </strong>The objective of this study was to compare concentrations of short ragweed major allergen (Amb a 1) and total protein in SLIT formulations stored at two different temperatures. It was hypothesised that protein concentrations would show greater decline over time in a formulation stored at room temperature (RT) than in one stored under refrigeration.</p><p><strong>Materials and methods: </strong>Two SLIT samples containing equal volumes of 20,000 PNU Amb a 1 extract were prepared and stored at refrigerated cold (CT) (2-8°C) or RT (20-24°C) for 140 days. Changes in total protein and major allergen concentration and composition were measured by Bradford assay, two-site enzyme-linked immunosorbent assay and SDS-PAGE. Presence of Amb a 1 was confirmed with Western immunoblot. Data were analysed using an analysis of covariance, with p < 0.05 considered significant.</p><p><strong>Results: </strong>SDS-PAGE showed compositional changes in a ~26-30 kDa protein band under RT and not CT storage. The Amb a 1 concentration of the RT SLIT sample declined significantly over time, compared to that of the CT SLIT sample (F<sub>(1,8)</sub> = 47.69, p < 0.0001). There was no significant difference in total protein concentration over time between groups (F<sub>(1,8)</sub> = 1.79, p = 0.22).</p><p><strong>Conclusions and clinical relevance: </strong>These results demonstrate that storage of glycerinated SLIT formulations in refrigerated CT preserved the highest concentration of the specific allergen Amb a 1, suggesting that SLIT formulations containing short ragweed should be stored under refrigeration.</p>","PeriodicalId":23599,"journal":{"name":"Veterinary dermatology","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Veterinary dermatology","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1111/vde.13310","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"DERMATOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background: Few studies have investigated optimal storage conditions or expiration dates for sublingual immunotherapy (SLIT) formulations prepared from glycerinated allergen extracts.
Hypothesis/objectives: The objective of this study was to compare concentrations of short ragweed major allergen (Amb a 1) and total protein in SLIT formulations stored at two different temperatures. It was hypothesised that protein concentrations would show greater decline over time in a formulation stored at room temperature (RT) than in one stored under refrigeration.
Materials and methods: Two SLIT samples containing equal volumes of 20,000 PNU Amb a 1 extract were prepared and stored at refrigerated cold (CT) (2-8°C) or RT (20-24°C) for 140 days. Changes in total protein and major allergen concentration and composition were measured by Bradford assay, two-site enzyme-linked immunosorbent assay and SDS-PAGE. Presence of Amb a 1 was confirmed with Western immunoblot. Data were analysed using an analysis of covariance, with p < 0.05 considered significant.
Results: SDS-PAGE showed compositional changes in a ~26-30 kDa protein band under RT and not CT storage. The Amb a 1 concentration of the RT SLIT sample declined significantly over time, compared to that of the CT SLIT sample (F(1,8) = 47.69, p < 0.0001). There was no significant difference in total protein concentration over time between groups (F(1,8) = 1.79, p = 0.22).
Conclusions and clinical relevance: These results demonstrate that storage of glycerinated SLIT formulations in refrigerated CT preserved the highest concentration of the specific allergen Amb a 1, suggesting that SLIT formulations containing short ragweed should be stored under refrigeration.
背景:很少有研究调查过由甘油化过敏原提取物制备的舌下免疫疗法(SLIT)制剂的最佳储存条件或失效日期:本研究的目的是比较在两种不同温度下储存的 SLIT 制剂中短豚草主要过敏原(Amb a 1)和总蛋白的浓度。假设在室温(RT)下储存的配方中,蛋白质浓度随着时间的推移会比在冷藏条件下储存的配方中的蛋白质浓度下降得更多:制备两种含有等量 20,000 PNU Amb a 1 提取物的 SLIT 样品,并在冷藏(CT)(2-8°C)或冷冻(RT)(20-24°C)条件下保存 140 天。通过布拉德福德测定法、双位点酶联免疫吸附测定法和 SDS-PAGE 法测量总蛋白和主要过敏原浓度及组成的变化。用 Western 免疫印迹法确认了 Amb a 1 的存在。采用协方差分析法对数据进行分析,结果为 p:SDS-PAGE 显示,在 RT 储存条件下,一条 ~26-30 kDa 蛋白带的组成发生了变化,而 CT 储存条件下则没有。与 CT SLIT 样品相比,RT SLIT 样品的 Amb a 1 浓度随时间显著下降(F(1,8) = 47.69, p (1,8) = 1.79, p = 0.22):这些结果表明,在冷藏 CT 中储存甘油化 SLIT 制剂可保存最高浓度的特定过敏原 Amb a 1,这表明含有短豚草的 SLIT 制剂应冷藏储存。
期刊介绍:
Veterinary Dermatology is a bi-monthly, peer-reviewed, international journal which publishes papers on all aspects of the skin of mammals, birds, reptiles, amphibians and fish. Scientific research papers, clinical case reports and reviews covering the following aspects of dermatology will be considered for publication:
-Skin structure (anatomy, histology, ultrastructure)
-Skin function (physiology, biochemistry, pharmacology, immunology, genetics)
-Skin microbiology and parasitology
-Dermatopathology
-Pathogenesis, diagnosis and treatment of skin diseases
-New disease entities