Identification of immunodominant IgE binding epitopes of Der p 24, a major allergen of Dermatophagoides pteronyssinus
Identification of immunodominant IgE binding epitopes of Der p 24, a major allergen of Dermatophagoides pteronyssinus
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屋尘螨主要过敏原 Der p 24 免疫显性 IgE 结合表位的鉴定
DOI：
10.1186/s13601-019-0266-7
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发表时间：
2019-05-23
影响因子：
4.4
通讯作者：
Ji, Kunmei
中科院分区：
文献类型：
--
作者：
Cai, Ze-Lang;Chen, Jia-Jie;Ji, Kunmei
Background:The identification of house dust mite (HDM) allergens and epitopes is important for allergy diagnosis and treatment. We sought to identify theDermatophagoides pteronyssinusgroup 24 allergen (Der p 24) and to identify its immunodominant IgE epitope(s).Methods:Der p 24 cDNA was cloned and expressed in a pET expression system. The IgE binding activity of purified recombinant (r)Der p 24 was evaluated by western blotting. Truncated Der p 24 proteins and overlapping synthetic polypeptides were subjected to IgE binding assays. Balb/c mice were immunized to investigate IgE epitope induction of IgE production. IgE binding of the 32 N-terminal residues of Der p 24 was compared to other Der p epitopes in enzyme-linked immunosorbent assays and dot blot assays. Human skin prick tests (SPTs) were performed.Results:We cloned and expressed Der p 24 cDNA (GenBank accession no. KP893174.1). HDM allergic sera bound rDer p 24 in vitro and 5/10 HDM allergic patients (50%) had positive SPT reactions to rDer p 24. The immunodominant IgE epitope of Der p 24 was localized to the N-terminal 32-residue region, which produced a high specific IgE antibody titer in vivo and promoted mast cell β-hexosaminidase release. The IgE binding activity this N-terminal epitope of Der p 24 was stronger than that of Der p 1 or Der p 2 IgE epitopes.Conclusions:We identified Der p 24 as a major HDM allergen with strong IgE binding activity via an immunodominant IgE epitope in the N-terminal 32-residue region, which triggers IgE production in vivo. The identified Der p 24 epitope may support HDM allergy diagnosis and treatment.
