Mapping Human Monoclonal IgE Epitopes on the Major Dust Mite Allergen Der p 2.

Mapping Human Monoclonal IgE Epitopes on the Major Dust Mite Allergen Der p 2.
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DOI:
10.4049/jimmunol.2000295
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发表时间:
2020-10-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Pomés A
Pomés A
中科院分区:
其他
文献类型:
--
作者:
Mueller GA;Glesner J;Daniel JL;Zhang J;Hyduke N;Richardson CM;DeRose EF;Chapman MD;Peebles RS Jr;A Smith S;Pomés A

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免疫球蛋白E抗体通过肥大细胞或嗜碱性粒细胞上的交联性过敏原引起过敏性疾病的症状。如果能够确定过敏原上的IgE结合位点,这可能有助于创造新的免疫疗法。然而,由于血液中产生IgE的B细胞的频率非常低,对人类IgE表位的直接了解是有限的。应用屋尘螨过敏患者的人B细胞杂交瘤技术,鉴定了4株Der p2特异性的人IgE单抗。用三种已研究过的小鼠免疫球蛋白(MIGG)单抗对它们的相对结合部位进行了评价和比较。免疫分析表明,前三个抗体对Der p 2的识别被一种MIGG所抑制,而第四个抗体识别的表位与所有其他单抗不同。在被动全身过敏反应的小鼠模型中,证实了HIGE与不同的表位结合到交联型Der p 2的功能能力。用核磁共振分析Der p2与免疫球蛋白抗体和免疫球蛋白E抗体的复合体,以确定表位中的特定残基。区分重叠表位的免疫分析和识别抗体结合所涉及的特定残基的核磁共振分析相结合,提供了人类抗过敏原单抗的第一个表位图。这里开发的技术将有助于高分辨率绘制其他抗原上的人类表位图,并设计改进的治疗方法。
IgE antibodies drive the symptoms of allergic disease upon crosslinking allergens on mast cells or basophils. If the IgE binding sites on the allergens could be identified, it may be useful for creating new forms of immunotherapy. However, direct knowledge of the human IgE epitopes is limited due to the very low frequency of IgE-producing B cells in blood. A new hybridoma technology using human B cells from house dust mite allergic patients was used to identify four Der p 2-specific human IgE monoclonal antibodies (hIgE mAbs). Their relative binding sites were assessed and compared by immunoassays with three previously studied murine IgG (mIgG) mAbs. Immunoassays showed that the recognition of Der p 2 by the first three hIgE was inhibited by a single mIgG, but the fourth hIgE recognized a different epitope from all the other mAbs. The functional ability of the hIgE that bind different epitopes to crosslink Der p 2 was demonstrated in a mouse model of passive systemic anaphylaxis. NMR analyses of Der p 2 in complex with IgG and IgE antibodies were used to identify specific residues in the epitopes. The combination of immunoassays to distinguish overlapping epitopes and NMR analyses to identify specific residues involved in Ab binding provided the first epitope mapping of human IgE monoclonal antibodies to an allergen. The technologies developed here will be useful in high resolution mapping of human epitopes on other antigens, and the design of improved therapeutics.
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影响因子: --
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