Abstract
Interleukin 10 (IL-10) is secreted by several hemopoietic cells and suppresses the Th1 mediated immune response, while stimulating B cell differentiation and the humoral immune response. IL-10 expression in Con A-stimulated peripheral blood mononuclear cells is related to three polymorphisms in the promoter region of the IL-10 gene; G/A at position − 1082, T/C at position − 819 and A/C at position − 592. We analyzed the distribution of these IL-10 polymorphisms in 64 MG patients and 87 healthy blood donors to determine any influence on MG susceptibility. MG patients had a significantly higher frequency of the ACC/ACC haplotype (12.5% vs 3.4% in controls), as had the subgroups with late onset MG and thymomatous MG (20.0% and 21.4%, respectively). Early onset MG patients had a high frequency of the ATA/ATA haplotype (19.2% vs 3.4% in controls). Titin Ab-positive MG patients had high ACC/ACC (20.0%). This study indicates a direct link between IL-10 and MG pathogenesis, although the complex role of this multi-faceted cytokine in vivo is as yet not fully elucidated.
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