Association of responsiveness to the major pollen allergen of Parietaria officinalis with HLA-DRB1 * alleles: A multicenter study

Mauro D'Amato, Anna Scotto D'Abusco, Enrico Maggi, Tonino Menna, Guido Sacerdoti, Sario M. Maurizio, Sebastiano Iozzino, Carmela De Santo, Umberto Oreste, Roberto Tosi, Gennaro D'Amato, Daniela Baltadijeva, Bengt Bjorkstén, Linda R. Freidhoff, Carlos Lahoz, David G. Marsh, Avner Rashef, Anna Ruffilli

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Parietaria, a plant belonging to the family of Urticaceae, is a major source of allergenic pollen in Europe. In the context of a multinational study, we investigated whether in allergic subjects antibody response towards Par o 1, the major allergen from P. officinalis, was associated with defined HLA-DRB1* alleles. The study population consisted of 234 allergic patients: 65 from Bulgaria, 30 from Israel, 99 from Italy, and 40 from Spain. In the Italian study group, the prevalence of ST positivity to Parietaria was 77%. In Parietaria ST-positive subjects, the prevalences of IgG and IgE serum Ab towards Par o 1 were 91% and 75%, respectively. HLA-DRB1*1101 and/or 1104 were significantly positively associated with the presence of IgG Ab and with high levels of IgE Ab towards this allergen (p = 0.0007 and p = 0.012, respectively). In the Spanish study group, the positive association of DR1100 with responsiveness to Par o 1 was confirmed (p = 0.02, RR = 4, and p = 0.002, RR = 7, for IgG and IgE Ab, respectively). None of the Bulgarian patients had IgE Ab to Par o 1, whereas IgG Ab response was observed in 7 out of 65 subjects and was positively associated with DRB1*1101 and/or 1104 (p = 0.025). In the Israeli study group, responsiveness to Par o 1 was not associated with specific HLA-DRB1* alleles. In conclusion, this study shows that in allergic patients from three European populations antibody response to the major allergen from the pollen of Parietaria is associated with HLA-DRB1* 1101 and/or 1104. Our data suggest that this association is stronger in subjects monosensitized to Parietaria.

Original languageEnglish
Pages (from-to)100-106
Number of pages7
JournalHuman Immunology
Issue number2
Publication statusPublished - 1 Apr 1996
Externally publishedYes

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