Allergy to olive pollen: T-cell response from olive allergic patients is restricted by DR7-DQ2 antigens |
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Authors: | B CÁRDABA R DE PABLO C VILCHES E MARTÍN C GELLER-BERNSTEIN B DE RES Y ZAHARAN V DEL POZO S GALLARDO E DE ARRUDA CHAVES Y WAISEL P PALOMINO M KREISLER C LAHOZ |
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Institution: | Department of Immunology, Fundaction Jitnenez Diaz, Madrid, Spain;Division of Immunology, Puerta de Hierro Hospital, Madrid, Spain;Allergy Departtnent, Zametihof Clinic. Tel Aviv. Israel;General Sick Fund Clinic Um-El-Fahm. Israel and Botany Department. Tel Aviv University. Tel Aviv, Israel |
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Abstract: | Backgound We have recently described the association between the IgE antibody response to Ole e I (the major antigen from olive tree pollen) and the DR7-DQ2 haplotype in a Spanish population. Objeectivc and methods Due to the linkage disequilibrium between DR7 and DQ2, and thus the dillicult distinction between the role of these two antigens in the T-cell activation response, we decided to solve this question by two approaches: 1. The study of another ethnic group, individuals of Arabic origin, with a presumably distinct disequilibrium linkage between DR and DQ antigens. Genomic DNA typing was performed in 46 subjects (allergic and non-allergic) by Restriction Fragment Length Polytnotphism (RFLP) and results showed that patients with specific IgE antibodies α-Ole e I, were DR7 and or DQ2. These data show a similar restriction pattern to those previously described for Spanish patients. The phenolypic frequency of DR7 antigen is significantly greater than in the non-allergic population, with a corrected P(PJ value of O.O.3 2 The analysis of the genetic requirements of Ole e I response, using T-cell lines speific for this antigen. This was first carried out by blocking the proliferative response of these T-cell lines with specific anti-human HLA class II antibodies and then testing the genetic restriction of this response using a panel of histoeompatible and histoincompatible Antigen Presenting Cells (APCs). Both experiments corroborate the hypothesis that DR7 and DQ2 are implicated in the recognition o(Ole e I. |
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Keywords: | olive pollen ullergy HLA class II genetic restriction Ole e 1 DR7-DQ2 Arab typing |
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