Asthma and diabetes mellitus type I: immunologic mechanisms of inverse association
Abstract
Introduction: Atopic diseases seem to occur less often than expected in children with T1DMM and vice versa. T1DM is a Th1 while atopic asthma is a Th2-mediated disease. Aim of the study was to assess the incidence of predisposing or protective for T1DM alleles in individuals with atopic asthma. To this purpose, we assessed the incidence of the HLA-DQ(B1 and A1) polymorphisms as well as the prevalence of the CTLA-4 +49A/G gene polymorphisms and the incidence of the IL-12p40 polymorphisms in a group of 100 children with atopic asthma, in 100 patients with T1DM as well as in a number of 100 controls. Methods: Molecular typing of six HLA-DQB1 alleles(*0201,*0301,*0302,*0602,*0603,*0604) was carried out, using the group-specific polymerase chain reaction amplification (PCR) method based on time-resolved fluorometry(TRF) technique. Further typing of three DQA1 alleles was performed in HLA-DQB1 *0201,x carriers. Polymorphisms of the exon 1 of the CTLA-4 +49A/G gene were determine ...
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