计算溶液所需的质量、体积或浓度。
天然 级 提供 ≥95%(SDS-PAGE) 纯度,适用于对基线干扰要求严格的色谱和分析工作流程。
-80℃储存,避免反复冻融。特低温运输 。请查阅批次 COA 获取详细规格。
SDS、COA、产品数据表及规格说明书均可下载。可通过批号查询获取批次 COA。
在色谱分析、有机合成和交叉偶联反应领域已被 0 篇同行评审文献引用。
免疫球蛋白 E是血浆中含量最低的免疫球蛋白。IgE 参与重度过敏反应;同时可通过促进细胞毒性颗粒释放,抵御寄生虫感染。
蛋白生物学作用
血清免疫球蛋白 E(IgE)是人血浆中丰度最低的抗体类别,健康人体内循环浓度低于 0.6 µg/mL。该单体糖蛋白拥有独特 Fc 区,含 7 个 N - 糖基化位点;其中 Asn394 位点存在保守的寡甘露糖聚糖,对维持蛋白结构稳定以及结合高亲和力受体 FcεRI 至关重要。IgE 可结合肥大细胞、嗜碱性粒细胞表面的 FcεRI,介导 I 型超敏反应;当接触过敏原时,触发细胞脱颗粒,释放组胺、白三烯与细胞因子。除过敏功能外,IgE 可激活嗜酸性粒细胞、嗜碱性粒细胞释放细胞毒性颗粒,对蠕虫等寄生虫感染起到免疫保护作用。
常见研究用途
血清 IgE 升高(>300 IU/mL)是哮喘、特应性皮炎、过敏性支气管肺曲霉病(ABPA)等过敏性疾病的典型特征。由 STAT3 基因突变引发的高 IgE 综合征(HIES),临床表现为反复感染、湿疹,IgE 水平可超过 2000 IU/mL。IgE 型多发性骨髓瘤是一种罕见浆细胞恶性肿瘤,产生结构正常、以 λ 轻链为主的单克隆 IgE,常合并肾功能损伤。寄生虫感染、HIV 等病毒性疾病也会造成多克隆 IgE 升高。临床中,总 IgE 定量检测用于辅助诊断 ABPA,并监测奥马珠单抗治疗效果;奥马珠单抗为抗 IgE 单克隆抗体,通过形成无活性复合物降低游离 IgE 水平。IgE 血清半衰期较短(2–3 天),但结合在免疫细胞表面的 IgE 可留存数周,因此精准过敏诊断需要同时检测血浆与细胞结合型 IgE。骨髓瘤来源 IgE 糖基化完整、保留受体结合活性,是蛋白结构研究的重要材料。靶向 IgE-FcεRI 相互作用及糖基化通路的新型疗法,可调控过敏反应,同时保留机体保护性免疫功能。
常见应用:体外诊断(IVD)检测标准品、校准品与质控品,治疗药物研究,免疫系统研究。
Immunoglobulin E is the least abundant plasma immunoglobulin. IgE is involved in severe allergic reactions; it also provides protection against parasitic infections by promoting cytotoxic granule release.
Role of protein in biology
Serum immunoglobulin E (IgE) is the least abundant antibody class in human plasma, circulating at concentrations below 0.6 µg/mL in healthy individuals. This monomeric glycoprotein features a unique Fc region with seven N-linked glycosylation sites, including a conserved oligomannose glycan at Asn394 critical for structural stability and binding to the high-affinity receptor FcεRI. IgE mediates type I hypersensitivity reactions by binding FcεRI on mast cells and basophils, triggering degranulation and release of histamine, leukotrienes, and cytokines upon allergen exposure. Beyond allergies, IgE plays a protective role against parasitic infections like helminths by activating eosinophils and basophils to release cytotoxic granules.
Common research uses
Elevated serum IgE (>300 IU/mL) is a hallmark in allergic conditions such as asthma, atopic dermatitis, and allergic bronchopulmonary aspergillosis (ABPA). Hyperimmunoglobulinemia E syndromes (HIES), caused by STAT3 mutations, present with recurrent infections, eczema, and IgE levels exceeding 2,000 IU/mL. IgE multiple myeloma, a rare plasma cell malignancy, produces monoclonal IgE with normal structure but lambda light chain predominance, often complicating renal function. Parasitic infections and viral diseases like HIV also drive polyclonal IgE elevation. Clinically, total IgE quantification aids in diagnosing ABPA and monitoring omalizumab therapy, an anti-IgE monoclonal antibody that reduces free IgE levels by forming inert complexes. Despite its short serum half-life (2–3 days), cell-bound IgE persists for weeks on immune cells, necessitating combined plasma and cell-bound IgE measurements for accurate allergy diagnosis. Myeloma-derived IgE remains invaluable for structural studies due to its intact glycosylation and receptor-binding properties. Emerging therapies targeting IgE-FcεRI interactions and glycosylation pathways aim to modulate allergic responses while preserving protective functions.
Common uses include IVD Assay standards, calibrators and controls, therapeutics research, immune system research.