HLA CLASS-II ANTIGENS DR4 AND DQ8 ARE ASSOCIATED WITH ALLERGY TO HEVEIN, A MAJOR ALLERGEN OF HEVEA LATEX

In this study we investigated the relationship between HLA class II al leles and the IgE-specific immune response to the 4.7 kDa polypeptide hevein of Hevea brasiliensis, a major latex allergen. 51 individuals w ith immediate-type latex allergy and 90 controls were examined for the polymorphisms in exon 2 of HLA-DRB1, 3,4, 5 and DQB1 by sequence-spec ific oligonucleotide probe typing. 35 (69%) out of 51 latex-sensitized subjects showed positive hevein-specific IgE values. Analysis of the HLA data among these 35 subjects revealed increased phenotype frequenc ies for DR4 (22/35, 63%) and DQ8 (18/35, 51%) when compared with those in the 16 hevein-negative but latex-positive subjects (DR4: 2/16, 13% , p=0.0009, p(c)=0.047; DQ8: 0/16, p=0.0003, p(c)=0.018) and with heal thy controls (DR4: 22/90, 24%, p=0.00012, p(c)=0.013; DQ8: 16/89, 18%, p=0.0003, p(c)=0.036). Finally the DR4-DQ8 haplotype frequency was si gnificantly elevated in hevein-positives when compared with hevein-neg atives (51% vs. 0, p=0.0003, p(c)=0.034) or controls (51% vs. 18%, p=0 .0002, p(c)=0.045) The present data suggest DR4 and DQ8 to be operatin g jointly as susceptibility factor for the allergy to hevein.