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  • Title: Recombinant monoclonal human immunoglobulin E to investigate the allergenic activity of major grass pollen allergen Phl p 5.
    Author: Madritsch C, Flicker S, Scheiblhofer S, Zafred D, Pavkov-Keller T, Thalhamer J, Keller W, Valenta R.
    Journal: Clin Exp Allergy; 2011 Feb; 41(2):270-80. PubMed ID: 21143538.
    Abstract:
    BACKGROUND: Allergen recognition by IgE antibodies is a key event in allergic inflammation. OBJECTIVE: To construct a plasmid for the expression of human monoclonal IgE antibodies of any desired specificity and to express IgE specific for the major timothy grass pollen allergen Phl p 5. METHODS: In a first step, the DNA sequence coding for the IgG(1) heavy chain was excised and replaced by the sequence coding for the human ɛ constant region gene in plasmid pLNOH2 expressing a human Phl p 5-specific IgG(1) heavy chain. Then, this construct together with a second plasmid expressing the corresponding Phl p 5-specific light chain was co-expressed in COS-7 cells. The Phl p 5-specific IgE (rhuMabEP5) was analysed for allergen-specificity and isotype by ELISA. Cross-reactivity of rhuMabEP5 was investigated by immunoblotting using pollen extracts from various grass species. The allergenic activity of Phl p 5 was studied by exposing rat basophil leukaemia (RBL) cells expressing human-FcɛRI to rhuMabEP5 and Phl p 5. RESULTS: We report the construction of vector pLNOH2-P5IgE, for the expression of human IgE and exemplify its usefulness by the production of a complete and functional human monoclonal IgE (rhuMabEP5). rhuMabEP5 is specific for the grass pollen allergen Phl p 5 and cross-reacts with group 5 allergens in natural grass pollen extracts. RBL-release assays with rhuMabEP5 demonstrated that oligomerization does not contribute to the high allergenic activity of Phl p 5. CONCLUSION AND CLINICAL RELEVANCE: Plasmid pLNOH2-P5IgE allowed the production of a fully functional human monoclonal IgE antibody specific for Phl p 5. Recombinant human IgE antibodies of defined specificity represent useful tools to investigate mechanisms underlying IgE-mediated allergies.
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